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Pugazhendhi AS, Neal CJ, Ta KM, Molinari M, Kumar U, Wei F, Kolanthai E, Ady A, Drake C, Hughes M, Yooseph S, Seal S, Coathup MJ. A neoteric antibacterial ceria-silver nanozyme for abiotic surfaces. Biomaterials 2024; 307:122527. [PMID: 38518591 DOI: 10.1016/j.biomaterials.2024.122527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/01/2024] [Accepted: 03/08/2024] [Indexed: 03/24/2024]
Abstract
Community-associated and hospital-acquired infections caused by bacteria continue to yield major global challenges to human health. Bacterial contamination on abiotic surfaces is largely spread via high-touch surfaces and contemporary standard disinfection practices show limited efficacy, resulting in unsatisfactory therapeutic outcomes. New strategies that offer non-specific and broad protection are urgently needed. Herein, we report our novel ceria-silver nanozyme engineered at a molar ratio of 5:1 and with a higher trivalent (Ce3+) surface fraction. Our results reveal potent levels of surface catalytic activity on both wet and dry surfaces, with rapid, and complete eradication of Pseudomonas aeruginosa, Staphylococcus aureus, and methicillin resistant S. aureus, in both planktonic and biofilm form. Preferential electrostatic adherence of anionic bacteria to the cationic nanozyme surface leads to a catastrophic loss in both aerobic and anaerobic respiration, DNA damage, osmodysregulation, and finally, programmed bacterial lysis. Our data reveal several unique mechanistic avenues of synergistic ceria-Ag efficacy. Ag potentially increases the presence of Ce3+ sites at the ceria-Ag interface, thereby facilitating the formation of harmful H2O2, followed by likely permeation across the cell wall. Further, a weakened Ag-induced Ce-O bond may drive electron transfer from the Ec band to O2, thereby further facilitating the selective reduction of O2 toward H2O2 formation. Ag destabilizes the surface adsorption of molecular H2O2, potentially leading to higher concentrations of free H2O2 adjacent to bacteria. To this end, our results show that H2O2 and/or NO/NO2-/NO3- are the key liberators of antibacterial activity, with a limited immediate role being offered by nanozyme-induced ROS including O2•- and OH•, and likely other light-activated radicals. A mini-pilot proof-of-concept study performed in a pediatric dental clinic setting confirms residual, and continual nanozyme antibacterial efficacy over a 28-day period. These findings open a new approach to alleviate infections caused by bacteria for use on high-touch hard surfaces.
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Affiliation(s)
- Abinaya Sindu Pugazhendhi
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States
| | - Craig J Neal
- Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Khoa Minh Ta
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, United Kingdom
| | - Marco Molinari
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, HD1 3DH, United Kingdom.
| | - Udit Kumar
- Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Fei Wei
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States
| | - Elayaraja Kolanthai
- Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Andrew Ady
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States
| | - Christina Drake
- Kismet Technologies, 7101 TPC Drive, Suite 130, Orlando, FL, 32822, United States
| | - Megan Hughes
- University of Cardiff, Cardiff, CF10 3AT, Wales, United Kingdom
| | - Shibu Yooseph
- Kravis Department of Integrated Sciences, Claremont McKenna College, Claremont, CA 91711, United States
| | - Sudipta Seal
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States; Advanced Materials Processing and Analysis Centre, Nanoscience Technology Center (NSTC), University of Central Florida, Orlando, FL, 32826, United States
| | - Melanie J Coathup
- Biionix Cluster, College of Medicine, University of Central Florida, Orlando, FL, 32827, United States.
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2
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M D, K S VB, R R, P J. Sorghum drought tolerance is enhanced by cerium oxide nanoparticles via stomatal regulation and osmolyte accumulation. Plant Physiol Biochem 2024; 212:108733. [PMID: 38761547 DOI: 10.1016/j.plaphy.2024.108733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 04/01/2024] [Accepted: 05/14/2024] [Indexed: 05/20/2024]
Abstract
Sorghum [Sorghum bicolor (L.) Moench] yield is limited by the coincidence of drought during its sensitive stages. The use of cerium oxide nanoparticles in agriculture is minimal despite its antioxidant properties. We hypothesize that drought-induced decreases in photosynthetic rate in sorghum may be associated with decreased tissue water content and organelle membrane damage. We aimed to quantify the impact of foliar application of nanoceria on transpiration rate, accumulation of compatible solutes, photosynthetic rate and reproductive success under drought stress in sorghum. In order to ascertain the mechanism by which nanoceria mitigate drought-induced inhibition of photosynthesis and reproductive success, experiments were undertaken in a factorial completely randomized design or split-plot design. Foliar spray of nanoceria under progressive soil drying conserved soil moisture by restricting the transpiration rate than water spray, indicating that nanoceria exerted strong stomatal control. Under drought stress at the seed development stage, foliar application of nanoceria at 25 mg L-1 significantly improved the photosynthetic rate (19%) compared to control by maintaining a higher tissue water content (18%) achieved by accumulating compatible solutes. The nanoceria-sprayed plants exhibited intact chloroplast and thylakoid membranes because of increased heme enzymes [catalase (53%) and peroxidase (45%)] activity, which helped in the reduction of hydrogen peroxide content (74%). Under drought, compared to water spray, nanoceria improved the seed-set percentage (24%) and individual seed mass (27%), eventually causing a higher seed yield. Thus, foliar application of nanoceria at 25 mg L-1 under drought can increase grain yield through increased photosynthesis and reproductive traits.
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Affiliation(s)
- Djanaguiraman M
- Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India.
| | - Vidhya Bharathi K S
- Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Raghu R
- Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Jeyakumar P
- Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
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Liu D, Zhu H, Gong X, Yuan S, Ma H, He P, Fan Y, Zhao W, Ren H, Guo W. Understanding and controlling the formation of single-atom site from supported Cu 10 cluster by tuning CeO 2 reducibility: Theoretical insight into the Gd-doping effect on electronic metal-support interaction. J Colloid Interface Sci 2024; 661:720-729. [PMID: 38320408 DOI: 10.1016/j.jcis.2024.01.174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 01/18/2024] [Accepted: 01/25/2024] [Indexed: 02/08/2024]
Abstract
Controlling the formation of single-atom (SA) sites from supported metal clusters is an important and interesting issue to effectively improve the catalytic performance of heterogeneous catalysts. For extensively studied CO oxidation over metal/CeO2 systems, the SA formation and stabilization under reaction conditions is generally attributed to CO adsorption, however, the pivotal role played by the reducible CeO2 support and the underlying electronic metal-support interaction (EMSI) are not yet fully understood. Based on a ceria-supported Cu10 catalyst model, we performed density functional theory calculations to investigate the intrinsic SA formation mechanism and discussed the synergistic effect of Gd-doped CeO2 and CO adsorption on the SA formation. The CeO2 reducibility is tuned with doped Gd content ranging from 12.5 % ∼ 25 %. Based on ab initio thermodynamic and ab initio molecular dynamics, the critical condition for SA formation was identified as 21.875 % Gd-doped CeO2 with CO-saturated adsorption on Cu10. Electronic analysis revealed that the open-shell lattice Oδ- (δ < 2) generated by Gd doping facilitates the charge transfer from the bottom-corner Cu (Cubc) to CeO2. The CO-saturated adsorption further promotes this charge transfer process and enhances the EMSI between Cubc and CeO2, leading to the disintegration of Cubc from Cu10 and subsequent formation of the active SA site.
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Affiliation(s)
- Dongyuan Liu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Houyu Zhu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China.
| | - Xiaoxiao Gong
- State Key Laboratory of Molecular & Process Engineering, SINOPEC Research Institute of Petroleum Processing Co., Ltd., Beijing 10083, PR China
| | - Saifei Yuan
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Hao Ma
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Ping He
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Yucheng Fan
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Wen Zhao
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Hao Ren
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China
| | - Wenyue Guo
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China.
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Ioannidi AA, Bampos G, Antonopoulou M, Oulego P, Boczkaj G, Mantzavinos D, Frontistis Z. Sonocatalytic degradation of Bisphenol A from aquatic matrices over Pd/CeO 2 nanoparticles: Kinetics study, transformation products, and toxicity. Sci Total Environ 2024; 919:170820. [PMID: 38340814 DOI: 10.1016/j.scitotenv.2024.170820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/30/2024] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
In this work, different ratios of palladium - cerium oxide (Pd/CeO2) catalyst were synthesized and characterized, while their sonocatalytic activity was evaluated for the degradation of the xenobiotic Bisphenol A (BPA) from aqueous solutions. Sonocatalytic activity expressed as BPA decomposition exhibited a volcano-type behavior in relation to the Pd loading, and the 0.25Pd/CeO2 catalyst characterized by the maximum Pd dispersion and lower crystallite size demonstrated the higher activity. Using 500 mg/L of 0.25 % Pd/CeO2 increased the kinetic constant for BPA destruction by more than two times compared to sonolysis alone (20 kHz at 71 W/L). Meanwhile, the simultaneous use of ultrasound and a catalyst enhanced the efficiency by 50.1 % compared to the sum of the individual processes, resulting in 95 % BPA degradation in 60 min. The sonocatalytic degradation of BPA followed pseudo-first-order kinetics, and the apparent kinetic constant was increased with ultrasound power and catalyst loading, while the efficiency was decreased in bottled water and secondary effluent. From the experiments that were conducted using appropriate scavengers, it was revealed that the degradation mainly occurred on the bubble/liquid interface of the formed cavities, while the reactive species produced from the thermal or light excitation of the prepared semiconductor also participated in the reaction. Five first-stage and four late-stage transformation products were identified using UHPLC/TOF-MS, and a pathway for the sonocatalytic degradation of BPA was proposed. According to ECOSAR software prediction, most transformation by-products (TBPs) present lower ecotoxicity than the parent compound, although some remain toxic to the indicators chosen.
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Affiliation(s)
- Alexandra A Ioannidi
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece
| | - Georgios Bampos
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece
| | - Maria Antonopoulou
- Department of Sustainable Agriculture, University of Patras, GR-30131 Agrinio, Greece
| | - Paula Oulego
- Department of Chemical and Environmental Engineering, University of Oviedo, c/ Julián Claverías, E-33071 Oviedo, Spain
| | - Grzegorz Boczkaj
- Gdansk University of Technology, Faculty of Civil and Environmental Engineering, Department of Sanitary Engineering, G. Narutowicza St. 11/12, 80-233 Gdansk, Poland; EkoTech Center, Gdansk University of Technology, G. Narutowicza St. 11/12, 80-233 Gdansk, Poland
| | - Dionissios Mantzavinos
- Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, GR-26504 Patras, Greece
| | - Zacharias Frontistis
- Department of Chemical Engineering, University of Western Macedonia, GR-50132 Kozani, Greece.
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Khan R, Andreescu S. Catalytic MXCeO 2 for enzyme based electrochemical biosensors: Fabrication, characterization and application towards a wearable sweat biosensor. Biosens Bioelectron 2024; 248:115975. [PMID: 38159417 DOI: 10.1016/j.bios.2023.115975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/23/2023] [Accepted: 12/25/2023] [Indexed: 01/03/2024]
Abstract
Two-dimensional (2D) layered materials that integrate metallic conductivity, catalytic activity and the ability to stabilize biological receptors provide unique capabilities for designing electrochemical biosensors for large-scale detection and diagnostic applications. Herein, we report a multifunctional MXene-based 2D nanostructure decorated with enzyme mimetic cerium oxide nanoparticle (MXCeO2) as a novel platform and catalytic amplifier for electrochemical biosensors, specifically targeting the detection of oxidase enzyme substrates. We demonstrate enhanced catalytic efficiency of the MXCeO2 for the reduction of hydrogen peroxide (H2O2) and its ability to immobilize oxidase enzymes, such as glucose oxidase, lactate oxidase and xanthine oxidase. The designed biosensors exhibit high selectivity, stability, and sensitivity, achieving detection limits of 0.8 μM H2O2, 0.49 μM glucose, 3.6 μM lactate and 1.7 μM hypoxanthine, when the MXCeO2 and their respective enzymes were used. The MXCeO2 was successfully incorporated into a wearable fabric demonstrating high sensitivity for lactate measurements in sweat. The unique combination of MXenes with CeO2 offers excellent conductivity, catalytic efficiency and enhanced enzyme loading, demonstrating potential of the MXCeO2 as a catalytically active material to boost efficiency of oxidase enzyme reactions. This design can be used as a general platform for increasing the sensitivity of enzyme based biosensors and advance the development of electrochemical biosensors for a variety of applications.
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Affiliation(s)
- Reem Khan
- Department of Chemistry and Biomolecular Science, Clarkson University, 8 Clarkson Avenue, Potsdam, NY, 13699, United States
| | - Silvana Andreescu
- Department of Chemistry and Biomolecular Science, Clarkson University, 8 Clarkson Avenue, Potsdam, NY, 13699, United States.
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Xu H, Li S, Ma X, Xue T, Shen F, Ru Y, Jiang J, Kuai L, Li B, Zhao H, Ma X. Cerium oxide nanoparticles in diabetic foot ulcer management: Advances, limitations, and future directions. Colloids Surf B Biointerfaces 2023; 231:113535. [PMID: 37729799 DOI: 10.1016/j.colsurfb.2023.113535] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/09/2023] [Accepted: 09/04/2023] [Indexed: 09/22/2023]
Abstract
Diabetic foot ulcer (DFU) is one of the most serious complications of diabetes, potentially resulting in wound infection and amputation under severe circumstances. Oxidative stress and dysbiosis are the primary factors that delay wound healing, posing challenges to effective treatment. Unfortunately, conventional approaches in these aspects have proven satisfactory in achieving curative outcomes. Recent research has increasingly focused on using nanoparticles, leveraging their potential in wound dressing and medication delivery. Their unique physical properties further enhance their therapeutic effectiveness. Among these nanoparticles, cerium oxide nanoparticles (CONPs) have garnered attention due to their notable beneficial effects on oxidative stress and microbial abundance, thus representing a promising therapeutic avenue for DFU. This review comprehensively assesses recent studies on CONPs in treating DFU. Furthermore, we elaborate on the wound healing process, ceria synthesis, and incorporating CONPs with other materials. Crucially, a thorough evaluation of CONPs' toxicity as a novel metallic nanomaterial for therapeutic use must precede their formal clinical application. Additionally, we identify the current challenges CONPs encounter and propose future directions for their development.
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Affiliation(s)
- Haotian Xu
- Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai 200443, China
| | - Shiqi Li
- Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai 200443, China
| | - Xiaoxuan Ma
- Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
| | - Tingting Xue
- Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
| | - Fang Shen
- Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai 200443, China
| | - Yi Ru
- Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
| | - Jingsi Jiang
- Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai 200443, China
| | - Le Kuai
- Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China; Institute of Dermatology, Shanghai Academy of Traditional Chinese Medicine, Shanghai 201203, China
| | - Bin Li
- Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai 200443, China; Institute of Dermatology, Shanghai Academy of Traditional Chinese Medicine, Shanghai 201203, China
| | - Hang Zhao
- Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China; Institute of Dermatology, Shanghai Academy of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Xin Ma
- Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai 200443, China; Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China.
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Zhang X, Liu T, Zhu L, Guan J, Lu Y, Keal TW, Buckeridge J, Catlow CRA, Sokol AA. Bulk and Surface Contributions to Ionisation Potentials of Metal Oxides. Angew Chem Int Ed Engl 2023; 62:e202308411. [PMID: 37503936 PMCID: PMC10953407 DOI: 10.1002/anie.202308411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 07/29/2023]
Abstract
Determining the absolute band edge positions in solid materials is crucial for optimising their performance in wide-ranging applications including photocatalysis and electronic devices. However, obtaining absolute energies is challenging, as seen in CeO2 , where experimental measurements show substantial discrepancies in the ionisation potential (IP). Here, we have combined several theoretical approaches, from classical electrostatics to quantum mechanics, to elucidate the bulk and surface contributions to the IP of metal oxides. We have determined a theoretical bulk contribution to the IP of stoichiometric CeO2 of only 5.38 eV, while surface orientation results in intrinsic IP variations ranging from 4.2 eV to 8.2 eV. Highly tuneable IPs were also found in TiO2 , ZrO2 , and HfO2 , in which surface polarisation plays a pivotal role in long-range energy level shifting. Our analysis, in addition to rationalising the observed range of experimental results, provides a firm basis for future interpretations of experimental and computational studies of oxide band structures.
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Affiliation(s)
- Xingfan Zhang
- Kathleen Lonsdale Materials ChemistryDepartment of ChemistryUniversity College LondonWC1H 0AJLondonUK
| | - Taifeng Liu
- Kathleen Lonsdale Materials ChemistryDepartment of ChemistryUniversity College LondonWC1H 0AJLondonUK
- National & Local Joint Engineering Research Center for Applied Technology of Hybrid NanomaterialsHenan University475004KaifengChina
| | - Lei Zhu
- Kathleen Lonsdale Materials ChemistryDepartment of ChemistryUniversity College LondonWC1H 0AJLondonUK
| | - Jingcheng Guan
- Kathleen Lonsdale Materials ChemistryDepartment of ChemistryUniversity College LondonWC1H 0AJLondonUK
| | - You Lu
- Scientific Computing DepartmentSTFC Daresbury LaboratoryWA4 4ADWarringtonCheshireUK
| | - Thomas W. Keal
- Scientific Computing DepartmentSTFC Daresbury LaboratoryWA4 4ADWarringtonCheshireUK
| | - John Buckeridge
- School of EngineeringLondon South Bank UniversitySE1 OAALondonUK
| | - C. Richard A. Catlow
- Kathleen Lonsdale Materials ChemistryDepartment of ChemistryUniversity College LondonWC1H 0AJLondonUK
- School of ChemistryCardiff UniversityPark PlaceCF10 1ATCardiffUK
| | - Alexey A. Sokol
- Kathleen Lonsdale Materials ChemistryDepartment of ChemistryUniversity College LondonWC1H 0AJLondonUK
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Murugadoss G, Rajesh Kumar M, Murugan D, Koutavarapu R, M Al-Ansari M, Aldawsari M. Ultra-fast photocatalytic degradation and seed germination of band gap tunable nickel doping ceria nanoparticles. Chemosphere 2023; 333:138934. [PMID: 37182707 DOI: 10.1016/j.chemosphere.2023.138934] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/24/2023] [Accepted: 05/11/2023] [Indexed: 05/16/2023]
Abstract
Doping transition metal ions into cerium oxide (CeO2) results in interesting modifications to the material, including an increase in surface area, a high isoelectric point, biocompatibility, greater ionic conductivity, and catalytic activity. Herein, various concentrations (1-5%, 10% and 20%) of nickel (Ni) doped CeO2 nanoparticle have been made by a facile chemical process. Using a variety of cutting-edge analytical techniques, the structural, optical, and photocatalytic properties of undoped and varied concentrations (1-5%, 10%, and 20%) of Ni doped CeO2 nanoparticles have been investigated. Pure cubic fluorite structure with average crystallite sizes in the region of 12-15 nm was determined by X-ray diffraction (XRD) investigation. High resolution electron microscopy (HR-TEM), which revealed highly homogeneous hexagonal shape of the particles with average size of 15 nm, was also used to determine microstructural information. According to the optical absorption, the band gaps of Ni doped and undoped CeO2 nanoparticles were found to be 2.96 eV and 1.95 eV, respectively. When exposed to sunlight, the narrow band gap Ni doped CeO2 nanoparticles worked as an active visible light catalyst to remove the dyes Rose Bengal (RB) and Direct Yellow (DY). The best photodegradation efficiencies for RB and DY dyes were found about 93% and 97%, respectively, using the 5% Ni-doped CeO2 catalyst. The apparent rate constant values of 0.039 for RB and 0.040 min-1 were attained for DY. As well, the treated, untreated dye solution and control solutions were utilized to assess the toxicity of commercially accessible Vigna Radiata seeds. In this study exhibits percentages of length and germination increased by 30-35% when compared to dye pollutant solution. The Ni doped CeO2 can provide a substantial alternative for current industrial waste management because of its quick photocatalytic activity and remarkable seed germination results.
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Affiliation(s)
- Govindhasamy Murugadoss
- Centre for Nanoscience and Nanotechnology, Sathyabama Institute of Science and Technology, Chennai, 600119, India.
| | - Manavalan Rajesh Kumar
- Institute of Natural Science and Mathematics, Ural Federal University, Yekaterinburg 620002, Russia
| | - Dakshana Murugan
- Department of Physics, Sathyabama Institute of Science and Technology, Chennai, 600119, India
| | - Ravindranadh Koutavarapu
- Department of Robotics Engineering, College of Mechanical and IT Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea.
| | - Mysoon M Al-Ansari
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Majdoleen Aldawsari
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
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Kahya N, Erim FB. Removal of fluoride ions from water by cerium-carboxymethyl cellulose beads doped with CeO 2 nanoparticles. Int J Biol Macromol 2023; 242:124595. [PMID: 37141970 DOI: 10.1016/j.ijbiomac.2023.124595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/24/2023] [Accepted: 04/21/2023] [Indexed: 05/06/2023]
Abstract
A novel adsorbent for fluoride ions (F-) removal was prepared from cerium ion cross-linked carboxymethyl cellulose (CMC) biopolymer beads loaded with CeO2 nanoparticles (NPs). The characterization of the beads was performed by swelling experiments, scanning electron microscopy and Fourier transforms infrared spectroscopy. The adsorption of fluoride ions from aqueous solutions was carried out with both cerium ion cross-linked CMC beads (CMCCe) and CeO2-NPs added beads (CeO2-CMC-Ce) in a batch system. Optimized adsorption conditions were obtained by testing the parameters such as pH, contact time, adsorbent dose, and shaking rate at 25 °C. The adsorption process is well described by the Langmuir isotherm and pseudo-second-order kinetics. The maximum adsorption capacity was found as 105 and 312 mg/g F- for CMC-Ce and CeO2-CMC-Ce beads, respectively. Reusability studies showed that, the adsorbent beads have exhibited excellent sustainable properties up to 9 cycle usage. This study suggests that, CMC-Ce composite with CeO2 nanoparticles is a very effective adsorbent in removing fluoride from water.
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Affiliation(s)
- Nilay Kahya
- Istanbul Technical University, Department of Chemistry, Maslak, Istanbul, Turkey
| | - F Bedia Erim
- Istanbul Technical University, Department of Chemistry, Maslak, Istanbul, Turkey.
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Zhang J, Mao X, Lan Y, Li J, Chen C, Yang J, Zhang W, Murali A, Liu L, Wang Q. Doping rare earth cations with an additional chemical reduction synergistically weakened the photocatalytic performance of ceria. Environ Sci Pollut Res Int 2023; 30:51356-51367. [PMID: 36809624 DOI: 10.1007/s11356-023-25981-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 02/13/2023] [Indexed: 04/16/2023]
Abstract
Chemical reducing or rare earth cations (RE) doping was normally employed to promote the photocatalytic performance of ceria, aimed to evaluate their cooperation influences, ceria was obtained by decomposing homogenously RE (RE = La, Sm, and Y)-doped CeCO3OH in H2. XPS and EPR results evidenced that the excess oxygen vacancies (OVs) were formed in RE-doped CeO2 compared to the un-doped ceria. However, all the RE-doped ceria unexpectedly showed an impeded photocatalytic activity towards to methylene blue (MB) photodegradation. The 5% Sm-doped ceria had the best MB photodegradation ratio of 81.47% after 2-h reaction in all RE-doped samples, which was lower than that of 87.24% for the un-doped ceria. After doping RE cations and chemical reducing, the band gap of ceria were almost narrowed, while the PL spectra and photo-electro characterizations indicated that the separation efficiency of photo-excited e-/h+ (electrons/holes) was reduced. The RE dopants and formed excess OVs including inner and surface OVs was proposed to promote the recombination of e-/h+ which further hindered the generation of active species of ·O2- and ·OH, and finally weakened the photocatalytic activity of ceria.
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Affiliation(s)
- Junshan Zhang
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
| | - Xisong Mao
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
| | - Yuanpei Lan
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China.
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China.
| | - Junqi Li
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
| | - Chaoyi Chen
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
| | - Jian Yang
- College of Materials Science and Engineering, Chongqing University, Shapingba, Chongqing, 400030, China
| | - Wei Zhang
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
| | - Arun Murali
- Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Li Liu
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
| | - Qin Wang
- Department of Metallurgical Engineering, College of Materials and Metallurgy, Guizhou University, Huaxi, Guiyang, 550025, Guizhou, China
- Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China
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11
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Murugesan S, Sasibabu V, Jegadeesan GB, Venkatachalam P. Photocatalytic degradation of Reactive Black dye using ZnO-CeO 2 nanocomposites. Environ Sci Pollut Res Int 2023; 30:42713-42727. [PMID: 35978239 DOI: 10.1007/s11356-022-22560-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 08/11/2022] [Indexed: 06/15/2023]
Abstract
This study presents the photocatalytic efficiency of ZnO-CeO2 nanocomposites for the degradation of a model Reactive Black (RB) dye. Nano-CeO2 was synthesized using cerium nitrate precursor solution via chemical precipitation. Synthesized nano-CeO2 was mixed with ZnO nanoparticles in different mass ratios to obtain ZnO-CeO2 heterojunction photocatalyst. The morphology of the nanocomposites was examined using transmission electron microscope (TEM). X-ray diffraction patterns of the CeO2 corresponded well with (1 1 1) plane of cubic-phase CeO2. The band gap of the ZnO-CeO2 nanocatalyst synthesized was determined to be 3.08 eV, which was lower than that of the pristine CeO2 and ZnO powders, respectively. The results indicate that 1:1 wt. ratio ZnO-CeO2 nanocomposite provides about 85% RB degradation within 90 min under UV light under alkaline pH conditions. Degradation rate of RB dye achieved with ZnO-CeO2 nanocomposite was almost 1.5 times greater than that obtained with pristine ZnO. Increasing CeO2 ratio beyond 1:1 wt. ratio did not significantly increase RB degradation. The results demonstrate that addition of CeO2 to ZnO results in lowering its band gap energy and aids charge carrier separation resulting in enhanced oxidation of RB dye under UV light.
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Affiliation(s)
- Saravanan Murugesan
- Bioprocess Intensification Laboratory, Center for Bioenergy, School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India
| | - Vigneshwar Sasibabu
- School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India
| | - Gautham B Jegadeesan
- School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India
| | - Ponnusami Venkatachalam
- Bioprocess Intensification Laboratory, Center for Bioenergy, School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India.
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12
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Yang W, Polo-Garzon F, Zhou H, Huang Z, Chi M, Meyer H, Yu X, Li Y, Wu Z. Boosting the Activity of Pd Single Atoms by Tuning Their Local Environment on Ceria for Methane Combustion. Angew Chem Int Ed Engl 2023; 62:e202217323. [PMID: 36478096 DOI: 10.1002/anie.202217323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/06/2022] [Accepted: 12/07/2022] [Indexed: 12/12/2022]
Abstract
Supported Pd single atom catalysts (SACs) have triggered great research interest in methane combustion yet with contradicting views on their activity and stability. Here, we show that the Pd SAs can take different electronic structure and atomic geometry on ceria support, resulting in different catalytic properties. By a simple thermal pretreatment to ceria prior to Pd deposition, a unique anchoring site is created. The Pd SA, taking this site, can be activated to Pdδ+ (0<δ<2) that has greatly enhanced activity for methane oxidation: T50 lowered by up to 130 °C and almost 10 times higher turnover frequency compared to the untreated catalyst. The enhanced activity of Pdδ+ site is related to its oxygen-deficient local structure and elongated interacting distance with ceria, leading to enhanced capability in delivering reactive oxygen species and decomposing reaction intermediates. This work provides insights into designing highly efficient Pd SACs for oxidation reactions.
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Affiliation(s)
- Weiwei Yang
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Felipe Polo-Garzon
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Hua Zhou
- X-Ray Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Zhennan Huang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Miaofang Chi
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Harry Meyer
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Xinbin Yu
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Yuanyuan Li
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Zili Wu
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.,Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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13
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Struijs JJC, Muravev V, Verheijen MA, Hensen EJM, Kosinov N. Ceria-Supported Cobalt Catalyst for Low-Temperature Methanation at Low Partial Pressures of CO 2. Angew Chem Int Ed Engl 2023; 62:e202214864. [PMID: 36464648 PMCID: PMC10107782 DOI: 10.1002/anie.202214864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 11/15/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022]
Abstract
The direct catalytic conversion of atmospheric CO2 to valuable chemicals is a promising solution to avert negative consequences of rising CO2 concentration. However, heterogeneous catalysts efficient at low partial pressures of CO2 still need to be developed. Here, we explore Co/CeO2 as a catalyst for the methanation of diluted CO2 streams. This material displays an excellent performance at reaction temperatures as low as 175 °C and CO2 partial pressures as low as 0.4 mbar (the atmospheric CO2 concentration). To gain mechanistic understanding of this unusual activity, we employed in situ X-ray photoelectron spectroscopy and operando infrared spectroscopy. The higher surface concentration and reactivity of formates and carbonyls-key reaction intermediates-explain the superior activity of Co/CeO2 as compared to a conventional Co/SiO2 catalyst. This work emphasizes the catalytic role of the cobalt-ceria interface and will aid in developing more efficient CO2 hydrogenation catalysts.
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Affiliation(s)
- Job J C Struijs
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology, P.O. Box 513, 5600MB, Eindhoven, The Netherlands
| | - Valery Muravev
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology, P.O. Box 513, 5600MB, Eindhoven, The Netherlands
| | - Marcel A Verheijen
- Department of Applied Physics Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands.,Eurofins Material Science Netherlands BV, 5656AE, Eindhoven, The Netherlands
| | - Emiel J M Hensen
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology, P.O. Box 513, 5600MB, Eindhoven, The Netherlands
| | - Nikolay Kosinov
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology, P.O. Box 513, 5600MB, Eindhoven, The Netherlands
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14
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Xiong C, Xue C, Yu X, He Y, Liang Y, Zhou X, Ji H. Tuning the olefin-VOCs epoxidation performance of ceria by mechanochemical loading of coinage metal. J Hazard Mater 2023; 441:129888. [PMID: 36084466 DOI: 10.1016/j.jhazmat.2022.129888] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/28/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
Under the background of carbon dioxide emission reduction, how to realize the treatment and the high value-added conversion of typical olefin volatile organic compounds (olefin-VOCs), such as styrene, is a big challenge. In this contribution, the ceria-supported coinage metal catalysts (M/CeO2, M = Au, Ag, and Cu) are successfully synthesized by a dry mechanochemical method, and their catalytic performance for styrene-VOC epoxidation with tert-butyl hydrogen peroxide (TBHP) as an oxidant to prepare high-value styrene oxide (SO) is investigated. The oxygen vacancies of ceria play a key role in the anchoring of metal nanoparticles. After ball milling, Au(III) is partially reduced and coexists on ceria in two valence states (Au3+ and Au0), and the reactive oxygen species of the as-prepared catalyst are enhanced. The catalytic behaviors, including solvents effect, substrate concentration, oxidant ratio, catalyst dosage, reaction time, and temperature, are systematically investigated. Au/CeO2 exhibits good styrene epoxidation performance with a total styrene conversion of 94% and a SO yield of 63%, along with good reusability and substrate scalability. Thermodynamics and kinetics show that Au/CeO2 was more favorable for styrene epoxidation and this reaction is dominated by the rate of intrinsic chemical reactions on the surface of the catalyst. Based on experimental discussions and a set of characterizations (XPS, XRD, in-situ FT-IR, ESR, ESI-HSMS, etc.), the mechanism is revealed as the synergistic catalysis between the reactive oxygen species of Au/CeO2 and the peroxide radicals generated by the homolysis of TBHP.
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Affiliation(s)
- Chao Xiong
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Can Xue
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China; Guangdong Provincial Key Laboratory of Optical Chemicals, XinHuaYue Group, Maoming 525000, PR China.
| | - Xingrui Yu
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China
| | - Yaorong He
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Yichao Liang
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China
| | - Xiantai Zhou
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China
| | - Hongbing Ji
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, PR China.
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15
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Venkatesh N, Mohankumar A, Murugadoss G, Sundararaj P, Hatamleh AA, Alnafisi BK, Kumar MR, Gouse Peera S, Sakthivel P. Visible light active hybrid silver decorated g-C 3N 4-CeO 2 nanocomposite for ultrafast photocatalytic activity and toxicity evaluation. Environ Res 2023; 216:114749. [PMID: 36356667 DOI: 10.1016/j.envres.2022.114749] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 10/30/2022] [Accepted: 11/04/2022] [Indexed: 06/16/2023]
Abstract
Development of hybrid graphitic carbon nitride (GCN) nanocomposite is an emerging research area in wastewater treatment. Herein, hybrid visible light active photocatalyst of silver decorated polymeric graphitic carbon nitride and (Ag-GCN) with cerium oxide (CeO2) nanocomposite was prepared and characterized in detail. The Ag-GCN/CeO2 photocatalyst has successfully prepared by an electrostatic self-assembly approach. The synthesized Ag-GCN/CeO2 NCs photocatalysts are characterized by various physio-chemical techniques. Using the Ag-GCN/CeO2 catalyst, the excellent photodegradation efficiency of Acid yellow-36 (AY-36) and Direct yellow-12 (DY-12) dye solution were achieved 100% within 150 min sun light irradiation. The Ag-GCN/CeO2 rate constant values of 0.048 and 0.046/min has been determined for AY-36 and DR-12 dyes, respectively. The extraordinary photocatalytic activity is due to incorporation of CeO2 with Ag-GCN which play a significant role in visible light absorption, superior reactive oxygen generation (ROS) and excellent pollutant catalyst interaction. The toxicity of the photocatalytically degraded AY-36 and DR-12 dyes were measured using the soil nematode Caenorhabditis elegans, a well-established in vivo model in biology, by analyzing survival, physiological functions, intracellular ROS levels, and stress-protective gene expressions.
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Affiliation(s)
- Nachimuthu Venkatesh
- Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | | | - Govindhasamy Murugadoss
- Centre for Nanoscience and Nanotechnology, Sathyabama Institute of Science and Technology, Chennai, 600 119, Tamil Nadu, India.
| | | | - Ashraf Atef Hatamleh
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Bassam Khalid Alnafisi
- Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Manavalan Rajesh Kumar
- Institute of Natural Science and Mathematics, Ural Federal University, Yekaterinburg, 620002, Russia
| | - Shaik Gouse Peera
- Department of Environmental Science, Keimyung University, Dalseo-gu, Daegu, 42601, South Korea.
| | - Pachagounder Sakthivel
- Department of Nanoscience and Technology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India.
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16
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Ahmad A, Javed MS, Khan S, Almutairi TM, Mohammed AAA, Luque R. Green synthesized Ag decorated CeO 2 nanoparticles: Efficient photocatalysts and potential antibacterial agents. Chemosphere 2023; 310:136841. [PMID: 36243088 DOI: 10.1016/j.chemosphere.2022.136841] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/22/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Implication of natural resources for manufacturing of nanoparticles is sustainable, economical and contaminant free approach towards ecological and medical applications. Herein, CeO2 and Ag/CeO2 nanoparticles are green synthesized from Morinda tinctoria plant extract. The phase structure, surface morphology, optical identity, Ce(III) and Ce(IV) valency of the synthesized CeO2 and Ag/CeO2 nanoparticles are explored. The X-ray diffraction analysis indicated the formation of cubic phase CeO2 and cubic silver decorated CeO2 nanoparticles. Fourier transform infrared (FTIR) spectroscopy revealed the metal decoration of CeO2 nanoparticles, metal-oxygen stretching, indicating the plant molecules reduction and stabilization. UV-visible spectroscopy shown the decreased band gap owing to silver modification. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs displayed spherical morphology of the nanoparticles. Elemental composition and sample purity is assessed by energy dispersive spectroscopy (EDS). Double oxidation of Ce, double splitting energy of Ag and lattice oxygen are observed from X-ray photoelectron spectroscopy (XPS). Photocatalytic activity of Ag/CeO2 exposed the enhanced photocatalytic activity up to 94% where CeO2 nanoparticles gave 60% degradation of bromophenol blue (BB). The plasmonic decoration of silver on the ceria surface induced the charge separations and free radical reactions. Moreover, Ag/CeO2 nanoparticles are seen as superior antibacterial agents than CeO2 towards both E.coli and S.aureus. Hence, the silver decorated metal oxide photocatalyst successfully degraded the BB dye and inactivated the bacterial strains. This report established a future research in green synthesis of multipurpose metal nanoparticles.
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Affiliation(s)
- Awais Ahmad
- Departmento de Quimica Organicia, Universitidad de Cordoba, Edificio Marie Curie (C-3) Ctra Nnal IV-A, km 396, E14104, Cordoba, Spain
| | - Muhammad Sufyan Javed
- School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, PR China
| | - Safia Khan
- Department of Chemistry, Quaid-i-Azam University, Islamabad, 43520, Pakistan
| | - Tahani Mazyad Almutairi
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Abdallah A A Mohammed
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Rafael Luque
- Departmento de Quimica Organicia, Universitidad de Cordoba, Edificio Marie Curie (C-3) Ctra Nnal IV-A, km 396, E14104, Cordoba, Spain; Peoples Friendship University of Russia (RUDN University), 6 Miklukho Maklaya str., 117198, Moscow, Russian Federation.
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17
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Maiti TK, Majhi J, Maiti SK, Singh J, Dixit P, Rohilla T, Ghosh S, Bhushan S, Chattopadhyay S. Zirconia- and ceria-based electrolytes for fuel cell applications: critical advancements toward sustainable and clean energy production. Environ Sci Pollut Res Int 2022; 29:64489-64512. [PMID: 35864400 DOI: 10.1007/s11356-022-22087-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Solid oxide fuel cells (SOFCs) are emerging as energy conversion devices for large-scale electrical power generation because of their high energy conversion efficiency, excellent ability to minimize air pollution, and high fuel flexibility. In this context, this critical review has focussed on the recent advancements in developing a suitable electrolyte for SOFCs which has been required for the commercialization of SOFC technology after emphasizing the literature from the prior studies. In particular, the significant developments in the field of solid oxide electrolytes for SOFCs, particularly zirconia- and ceria-based electrolytes, have been highlighted as important advancements toward the production of sustainable and clean energy. It has been reported that among various electrolyte materials, zirconia-based electrolytes have the potential to be utilized as the electrolyte in SOFC because of their high thermal stability, non-reducing nature, and high mechanical strength, along with acceptable oxygen ion conductivity. However, some studies have proved that the zirconia-based electrolytes are not suitable for low and intermediate-temperature working conditions because of their poor ionic conductivity to below 850 °C. On the other hand, ceria-based electrolytes are being investigated at a rapid pace as electrolytes for intermediate and low-temperature SOFCs due to their higher oxygen ion conductivity with good electrode compatibility, especially at lower temperatures than stabilized zirconia. In addition, the most emerging advancements in electrolyte materials have demonstrated that the intermediate temperature SOFCs as next-generation energy conversion technology have great potential for innumerable prospective applications.
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Affiliation(s)
- Tushar Kanti Maiti
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Jagannath Majhi
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Subrata Kumar Maiti
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Jitendra Singh
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Prakhar Dixit
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Tushita Rohilla
- Department of Mechanical Engineering, IIT Ropar, Punjab, 140 001, India
| | - Samaresh Ghosh
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Sakchi Bhushan
- Department of Paper Technology, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
| | - Sujay Chattopadhyay
- Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India.
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18
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Meng S, Yao Z, Liu J, Wang E, Li C, Jiang B, Xu Z. Carbon dots capped cerium oxide nanoparticles for highly efficient removal and sensitive detection of fluoride. J Hazard Mater 2022; 435:128976. [PMID: 35472541 DOI: 10.1016/j.jhazmat.2022.128976] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/07/2022] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
Since the excess exposure to F- may induce serious issues to human health, the effective adsorption and sensitive detection of F- is essential. Therefore, carbon dots (CDs) capped CeO2 (CeO2@CDs) was synthesized via hydrothermal treatment of tannic acid and CeCl3. Due to abundant phenolic hydroxyl are reserved and excellent hydrophilicity, CeO2@CDs possess high F- adsorption capacity. The partition coefficient parameters (PC) are determined to be 2.65 L/g, which is comparable with previous work. The kinetics results and adsorption isotherm are consistent with pseudo-second-order model and Freundlich model, respectively, indicating the chemisorption dominate the adsorption, mainly via the ion exchange between hydroxyl and F-. Since phenolic hydroxyl existed on the CeO2@CDs, synergetic effect of CDs and CeO2 contribute to superior ROS eliminating capacity, even at acidic conditions. Moreover, due to the ROS scavenging of CeO2 @CDs abilities can be potentiated by F-, colorimetric detection of F- can be realized via horseradish peroxidase as an indicator. The linear range is 0.3-2.1 mM with limit of detection is 0.13 mg/L. The current results imply that CeO2@CDs possess potential in both efficient removal and sensitive detection of F- related contamination issues and elucidation of development to address other anions related issues.
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Affiliation(s)
- Song Meng
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Zhihao Yao
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Jiawei Liu
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Erjing Wang
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Cao Li
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Bingbing Jiang
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China.
| | - Ziqiang Xu
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China.
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19
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Huang Y, Liu Y, Deng Y, Zhang J, He B, Sun J, Yang Z, Zhou W, Zhao L. Enhancing the bifunctional activity of CoSe 2 nanocubes by surface decoration of CeO 2 for advanced zinc-air batteries. J Colloid Interface Sci 2022; 625:839-849. [PMID: 35772210 DOI: 10.1016/j.jcis.2022.06.094] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 06/07/2022] [Accepted: 06/20/2022] [Indexed: 10/31/2022]
Abstract
The coupling of oxygen evolution and reduction reactions (OER and ORR) plays a key role in rechargeable Zn-air batteries (ZABs). However, both OER and ORR still suffer from sluggish kinetics, even when using the mainstream precious metal-based catalysts. Herein, oxygen vacancies-rich CeO2 decorated CoSe2 nanocubes are proposed as a novel air electrode to drive OER and ORR for ZABs. The resultant CeO2 coupled CoSe2 nanocubes (CeO2@CoSe2-NCs) catalyst exhibits a significantly enhanced bifunctional activity relative to the pristine CoSe2-NCs and the pristine CeO2. Moreover, an assembled ZABs using this CeO2@CoSe2-NCs electrode delivers a high output power density of 153 mW cm-2 and a long-life stability over 400 cycles, superior to the benchmark Pt/C-IrO2 electrode. Theoretical calculations reveal that the electronic interaction and oxygen vacancies in CeO2@CoSe2-NCs contribute to efficient oxygen electrocatalysis. This protocol provides a promising approach of constructing oxygen vacancies in hybrid catalysts for energy conversion and storage devices.
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Affiliation(s)
- Yonglong Huang
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Yuzhou Liu
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Yanzhu Deng
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Jing Zhang
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Beibei He
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China; Shenzhen Research Institute, China University of Geosciences, Shenzhen 518000, China.
| | - Jian Sun
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Zhihong Yang
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Wei Zhou
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Ling Zhao
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China; Shenzhen Research Institute, China University of Geosciences, Shenzhen 518000, China.
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20
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Fu S, Chen H, Yang W, Xia X, Zhao S, Xu X, Ai P, Cai Q, Li X, Wang Y, Zhu J, Zhang B, Zheng JC. ROS-Targeted Depression Therapy via BSA-Incubated Ceria Nanoclusters. Nano Lett 2022; 22:4519-4527. [PMID: 35583518 PMCID: PMC9185743 DOI: 10.1021/acs.nanolett.2c01334] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/12/2022] [Indexed: 05/23/2023]
Abstract
Depression is one of the most fatal mental diseases, and there is currently a lack of efficient drugs for the treatment of depression. Emerging evidence has indicated oxidative stress as a key pathological feature of depression. We targeted reactive oxygen species (ROS) and synthesized CeO2@BSA nanoclusters as a novel antidepression nanodrug via a convenient, green, and highly effective bovine serum albumin (BSA) incubation strategy. CeO2@BSA has ultrasmall size (2 nm) with outstanding ROS scavenging and blood-brain barrier crossing capacity, rapid metabolism, and negligible adverse effects in vitro and in vivo. CeO2@BSA administration alleviates depressive behaviors and depression-related pathological changes of the chronic restraint stress-induced depressive model, suggesting promising therapeutic effects of CeO2@BSA for the treatment of depression. Our study proved the validity by directly using nanodrugs as antidepression drugs instead of using them as a nanocarrier, which greatly expands the application of nanomaterials in depression treatment.
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Affiliation(s)
- Shengyang Fu
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
| | - Huili Chen
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
| | - Weitao Yang
- The
Institute for Translational Nanomedicine, Shanghai East Hospital, Shanghai 200120, China
- The
Institute for Biomedical Engineering & Nano Science, School of
Medicine, Tongji University, Shanghai 200092, China
- Shanghai
Frontiers Science Center of Nanocatalytic Medicine, Tongji University School of Medicine, Shanghai 200331, China
| | - Xiaohuan Xia
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
- Shanghai
Frontiers Science Center of Nanocatalytic Medicine, Tongji University School of Medicine, Shanghai 200331, China
- Translational
Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People’s Hospital affiliated
to Tongji University School of Medicine, Shanghai 200434, China
| | - Shu Zhao
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
| | - Xiaonan Xu
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
| | - Pu Ai
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
- Wuxi
Clinical College of Anhui Medical University, Hefei 230022, China
| | - Qingyuan Cai
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
- Franklin
& Marshall College, Lancaster, Pennsylvania 17603, United States
| | - Xiangyu Li
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
| | - Yi Wang
- Center
for Translational Neurodegeneration and Regenerative Therapy, Yangzhi Rehabilitation Hospital affiliated to Tongji
University, Shanghai 200065, China
| | - Jie Zhu
- Center
for Translational Neurodegeneration and Regenerative Therapy, Shanghai Tenth People’s Hospital affiliated
to Tongji University School of Medicine, Shanghai 200065, China
| | - Bingbo Zhang
- The
Institute for Translational Nanomedicine, Shanghai East Hospital, Shanghai 200120, China
- The
Institute for Biomedical Engineering & Nano Science, School of
Medicine, Tongji University, Shanghai 200092, China
- Shanghai
Frontiers Science Center of Nanocatalytic Medicine, Tongji University School of Medicine, Shanghai 200331, China
| | - Jialin C. Zheng
- Center
for Translational Neurodegeneration and Regenerative Therapy, Tongji Hospital affiliated to Tongji University School
of Medicine, Shanghai 200065, China
- The
Institute for Biomedical Engineering & Nano Science, School of
Medicine, Tongji University, Shanghai 200092, China
- Shanghai
Frontiers Science Center of Nanocatalytic Medicine, Tongji University School of Medicine, Shanghai 200331, China
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21
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Zhang Y, Yu H, Wang X, Wang L, Li Y, Lv D, Zhu D, Tian C. Simultaneous catalytic oxidation of elemental mercury and arsine over CeO 2(111) surface: a density functional theory study. J Mol Model 2022; 28:156. [PMID: 35583577 DOI: 10.1007/s00894-022-05153-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 05/12/2022] [Indexed: 10/18/2022]
Abstract
Ceria (CeO2)-based materials are potential catalysts for the removal of the Hg0 and AsH3 present in reducing atmospheres. However, theoretical studies investigating the Hg0 and AsH3 removal capacity of ceria remain limited. In this study, the adsorption behavior and mechanistic pathways for the catalytic oxidation of Hg0 and AsH3 on the CeO2(111) surface, including the calculation of optimized adsorption configurations and energies, were investigated using density functional theory calculations. The results suggest that Hg0 and AsH3 are favorably adsorbed on the CeO2(111) surface, whereas CO is not, which is crucial for selective removal when CO is a desirable gas component. Furthermore, AsH3 is adsorbed more favorably than Hg0. In addition, the calculations revealed that the Hg atom is initially adsorbed on the surface and then oxidized by lattice oxygen to form HgO. Concerning AsH3 decomposition, the stepwise dehydrogenation of AsH3 followed by bonding with lattice O atoms to form the As-O bond seems the most plausible. Finally, the adsorbed As-O bond is further forms elemental As and As2O3. Therefore, CeO2 can adsorb and remove Hg0 and AsH3, making it a promising catalyst for the simultaneous catalytic oxidation of Hg0 and AsH3 in strongly reducing off-gas.
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22
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Wan W, Geiger J, Berdunov N, Lopez Luna M, Chee SW, Daelman N, López N, Shaikhutdinov S, Roldan Cuenya B. Highly Stable and Reactive Platinum Single Atoms on Oxygen Plasma-Functionalized CeO 2 Surfaces: Nanostructuring and Peroxo Effects. Angew Chem Int Ed Engl 2022; 61:e202112640. [PMID: 35243735 PMCID: PMC9315031 DOI: 10.1002/anie.202112640] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Indexed: 12/12/2022]
Abstract
Atomically dispersed precious metals on oxide supports have recently become increasingly interesting catalytic materials. Nonetheless, their non‐trivial preparation and limited thermal and environmental stability constitutes an issue for their potential applications. Here we demonstrate that an oxygen plasma pre‐treatment of the ceria (CeO2) surface serves to anchor Pt single atoms, making them active and resistant towards sintering in the CO oxidation reaction. Through a combination of experimental results obtained on well‐defined CeO2 films and theory, we show that the O2 plasma causes surface nanostructuring and the formation of surface peroxo (O22−) species, favoring the uniform and dense distribution of isolated strongly bonded Pt2+ atoms. The promotional effect of the plasma treatment was further demonstrated on powder Pt/CeO2 catalysts. We believe that plasma functionalization can be applied to other metal/oxide systems to achieve tunable and stable catalysts with a high density of active sites.
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Affiliation(s)
- Weiming Wan
- Department of Interface Science, Fritz Haber Institute, Faradayweg 4-6, 14195, Berlin, Germany
| | - Julian Geiger
- Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology Institution, 43007, Tarragona, Spain
| | - Nikolay Berdunov
- Department of Interface Science, Fritz Haber Institute, Faradayweg 4-6, 14195, Berlin, Germany
| | - Mauricio Lopez Luna
- Department of Interface Science, Fritz Haber Institute, Faradayweg 4-6, 14195, Berlin, Germany
| | - See Wee Chee
- Department of Interface Science, Fritz Haber Institute, Faradayweg 4-6, 14195, Berlin, Germany
| | - Nathan Daelman
- Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology Institution, 43007, Tarragona, Spain
| | - Núria López
- Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology Institution, 43007, Tarragona, Spain
| | - Shamil Shaikhutdinov
- Department of Interface Science, Fritz Haber Institute, Faradayweg 4-6, 14195, Berlin, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz Haber Institute, Faradayweg 4-6, 14195, Berlin, Germany
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23
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Chen L, Shen Y, Wang Q, Wang X, Wang Y, Li B, Li S, Zhang S, Li W. Phosphate on ceria with controlled active sites distribution for wide temperature NH 3-SCR. J Hazard Mater 2022; 427:128148. [PMID: 34973577 DOI: 10.1016/j.jhazmat.2021.128148] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/14/2021] [Accepted: 12/22/2021] [Indexed: 06/14/2023]
Abstract
Practical catalysts that work well at a wide operation window for selective catalytic reduction of NOx by NH3 (NH3-SCR) are essential for the purification of non-isothermal emission such as vehicle exhaust. However, NH3-SCR catalyst with high low-temperature performance has excellent NO activation and oxidation ability, leading inevitably to NH3-intermediates over-oxidation and N2 selectivity deterioration at high operation temperatures. By far the best performance ceria-based catalyst with a super-wide temperature window of 175-400 oC for 90% NOx conversion in ideal environment and 225-475 oC for 90% NOx conversion by addition of 50 ppm SO2 and 5% H2O is obtained via distributing phosphate over the outer of ceria. NH3 protection strategy is the key for keeping high-temperature activity. Brønsted acidity surged as the formation of P-OH network via a charge compensatory mechanism of phosphate. NH3 was prone to be captured by the surface P-OH network, forming NH4+ species, avoiding being oxidized and contributing to both low and high temperature activity. NO can also be readily absorbed and oxidized to the absorbed NO2(ad) species over phosphate as reflected by in situ DRIFTS and DFT calculation, providing a facile pathway for 'fast SCR' by reacting with NH4+ species to form N2 and H2O. The reaction followed the L-H mechanism and contributed to catalytic activity under 300 oC. This directional structure fabricate strategy helps to increases the NOx conversion and N2 selectivity under a broaden temperature window. The enriched Brønsted acid sites over phosphate treated ceria were also demonstrated to have largely suppressed SO2 adsorption, which significantly slowed down the catalyst poisoning. A dynamic equilibrium between the poisoning and regeneration process can be achieved according to the shrinking-core model for each nanosphere, leading to the excellent resistance.
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Affiliation(s)
- Liang Chen
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121 Zhejiang, China; Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yao Shen
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qiaoli Wang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xiaoxiang Wang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yaqing Wang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Beilei Li
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Sujing Li
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Shihan Zhang
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China; Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Wei Li
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
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24
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Fauzi AA, Jalil AA, Hassan NS, Aziz FFA, Azami MS, Hussain I, Saravanan R, Vo DVN. A critical review on relationship of CeO 2-based photocatalyst towards mechanistic degradation of organic pollutant. Chemosphere 2022; 286:131651. [PMID: 34346345 DOI: 10.1016/j.chemosphere.2021.131651] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 05/21/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Nanostructured photocatalysts commonly offered opportunities to solve issues scrutinized with the environmental challenges caused by steep population growth and rapid urbanization. This photocatalyst is a controllable characteristic, which can provide humans with a clean and sustainable ecosystem. Over the last decades, one of the current thriving research focuses on visible-light-driven CeO2-based photocatalysts due to their superior characteristics, including unique fluorite-type structure, rigid framework, and facile reducing oxidizing properties of cerium's tetravalent (Ce4+) and trivalent (Ce3+) valence states. Notwithstanding, owing to its inherent wide energy gap, the solar energy utilization efficiency is low, which limits its application in wastewater treatment. Numerous modifications of CeO2 have been employed to enhance photodegradation performances, such as metals and non-metals doping, adding support materials, and coupling with another semiconductor. Besides, all these doping will form a different heterojunction and show a different way of electron-hole migration. Compared to conventional heterojunction, advanced heterojunction types such as p-n heterojunction, Z-scheme, Schottky junction, and surface plasmon resonance effect exhibit superior performance for degradation owing to their excellent charge carrier separation, and the reaction occurs at a relatively higher redox potential. This review attends to providing deep insights on heterojunction mechanisms and the latest progress on photodegradation of various contaminants in wastewater using CeO2-based photocatalysts. Hence, making the CeO2 photocatalyst more foresee and promising to further development and research.
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Affiliation(s)
- A A Fauzi
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Johor, Malaysia
| | - A A Jalil
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Johor, Malaysia; Centre of Hydrogen Energy, Institute of Future Energy, UTM Johor Bahru, 81310, Johor, Malaysia.
| | - N S Hassan
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Johor, Malaysia
| | - F F A Aziz
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Johor, Malaysia
| | - M S Azami
- Faculty of Science, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Malaysia
| | - I Hussain
- Faculty of Science, Universiti Teknologi Malaysia, UTM Johor Bahru, 81310, Malaysia
| | - R Saravanan
- Faculty of Engineering, Department of Mechanical Engineering, University of Tarapacá, Avda, General Velasquez, 1775 Arica, Chile
| | - D-V N Vo
- Center of Excellence for Green Energy and Environmental Nanomaterials (CE@GrEEN), Nguyen Tat Thanh University, 300A Nguyen Tat Thanh, District 4, Ho Chi Minh City, 755414, Viet Nam
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25
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Rashid US, Das TK, Sakthivel TS, Seal S, Bezbaruah AN. GO-CeO₂ nanohybrid for ultra-rapid fluoride removal from drinking water. Sci Total Environ 2021; 793:148547. [PMID: 34328953 DOI: 10.1016/j.scitotenv.2021.148547] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 06/06/2021] [Accepted: 06/15/2021] [Indexed: 05/05/2023]
Abstract
The presence of excess fluoride (F- > 1.5 mg/L) in drinking water affects more than 260 million people globally and leads to dental and skeletal fluorosis among other health problems. This study investigated fluoride removal by graphene oxide-ceria nanohybrid (GO-CeO2) and elucidated the mechanisms involved. The nanohybrid exhibited ultra-rapid kinetics for fluoride removal and the equilibrium (85% removal, 10 mg F-/L initial concentration) was achieved within 1 min which is one of the fastest kinetics for fluoride removal reported so far. Fluoride removal by the nanohybrid followed Langmuir isotherm with a maximum adsorption capacity of 8.61 mg/g at pH 6.5 and that increased to 16.07 mg/g when the pH was lowered to 4.0. Based on the experimental results and characterization data, we have postulated that both electrostatic interaction and surface complexation participated in the fluoride removal process. The O2- ions present in the CeO2 lattice were replaced by F- ions to make a coordination compound (complex). While both Ce4+ and Ce3+ were present in ceria nanoparticles (CeO2 NPs), Ce3+ participated in fluoride complexation. During fluoride removal by GO-CeO2, the GO sheets acted as electron mediators and help to reduce Ce4+ to Ce3+ at the CeO2 NPs-GO interface, and the additional Ce3+ enhanced fluoride removal by the nanohybrid.
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Affiliation(s)
- Umma S Rashid
- Nanoenvirology Research Group, Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA
| | - Tonoy K Das
- Nanoenvirology Research Group, Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA
| | - Tamil S Sakthivel
- Advanced Materials Processing and Analysis Center (AMPAC), Nanoscience and Technology Center (NSTC), Materials Science and Engineering (MSE), University of Central Florida, Orlando, USA
| | - Sudipta Seal
- Advanced Materials Processing and Analysis Center (AMPAC), Nanoscience and Technology Center (NSTC), Materials Science and Engineering (MSE), University of Central Florida, Orlando, USA; College of Medicine, University of Central Florida, Orlando, FL 32826, USA.
| | - Achintya N Bezbaruah
- Nanoenvirology Research Group, Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA.
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26
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Lai H, Zeng X, Song T, Yin S, Long B, Ali A, Deng GJ. Fast synthesis of porous iron doped CeO 2 with oxygen vacancy for effective CO 2 photoreduction. J Colloid Interface Sci 2021; 608:1792-1801. [PMID: 34742088 DOI: 10.1016/j.jcis.2021.10.064] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 01/10/2023]
Abstract
The activity of photocatalytic CO2 conversion to carbon-containing products is determined by the adsorption and activation of CO2 molecules on the surface of catalyst. Here, iron doped porous CeO2 with oxygen vacancy (PFeCe) was prepared by one-step combustion method. The amount of CO2 adsorbed via using the porous structure has been significantly increased in the case of a relatively small specific surface area and CO2 molecules are more easily captured and undergo a reduction reaction with photoinduced carriers. In addition, oxygen vacancies are formed in the iron doped CeO2 lattice as the active sites for CO2 reduction, which can form strong interactions with CO2 molecules, thereby effectively activating CO2 molecules. The reduction products of CO2 over PFeCe composite are CO and CH4, which is approximately 9.0 and 7.7 folds than that of CeO2. This work offers insights for the construction of efficient ceria-based photocatalysts to further achieve robust solar CO2 conversion.
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Affiliation(s)
- Haiwei Lai
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, PR China
| | - Xiangdong Zeng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, PR China
| | - Ting Song
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, PR China.
| | - Shiheng Yin
- Analytical and Testing Center, South China University of Technology, Guangzhou 510640, PR China
| | - Bei Long
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, PR China
| | - Atif Ali
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, PR China.
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27
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He J, Zhang H, Wang W, Yao P, Jiao Y, Wang J, Chen Y. Soot combustion over CeO 2 catalyst: the influence of biodiesel impurities (Na, K, Ca, P) on surface chemical properties. Environ Sci Pollut Res Int 2021; 28:26018-26029. [PMID: 33481195 DOI: 10.1007/s11356-020-11918-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 12/01/2020] [Indexed: 06/12/2023]
Abstract
This work assessed the impact of biodiesel impurities on CeO2 catalyst for soot combustion via soot-TPO experiments. The results showed that Na- and K-doped catalysts were assisted for soot combustion, while Ca- and P-doped catalysts had a negative effect. N2 adsorption-desorption and XRD results indicated that doping biodiesel impurities led to smaller surface area by blocking small pores. Surface chemical properties are suggested as major reasons for promoting soot combustion by means of XPS, H2-TPR, and O2-TPD. Na- and K-doped catalysts showed stronger redox ability and surface lattice oxygen mobility, poorly for Ca- and P-doped catalysts. Interestingly, a large number of surface oxygen species were observed on P-doped catalyst and it enhanced the ignition of bio soot. In the presence of NO, surface chemical properties including NOx storage/release capacity and NO oxidation ability were characterized by NO-adsorption DRIFTS, NO-TPO and NOx-desorption DRIFTS, alkali-doped catalyst with excellent NOx storage capacity that can release active oxygen species and gaseous NO2 accelerate heterogeneous soot combustion, and the poor NO conversion ability to NO2 that weakens the promotion effect of soot combustion. Particularly in the existence of P, the promotion effect of soot elimination in NO + O2 was further weakened by the reason of poor NOx storage capacity and NO oxidation ability.
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Affiliation(s)
- Jishuang He
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China
| | - Hailong Zhang
- College of Chemistry and Chemical Engineer, Xiamen University, Xiamen, 361005, Fujian, China
| | - Wei Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China
| | - Peng Yao
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610064, Sichuan, China
| | - Yi Jiao
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610064, Sichuan, China.
| | - Jianli Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China.
| | - Yaoqiang Chen
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu, 610064, Sichuan, China
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28
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Hu Z, Zou Z, Xie A, Chen C, Zhu X, Zhang Y, Zhang H, Zhao H, Wang G. Crystal plane effect of ceria on supported copper catalyst for liquid-phase hydrogenation of unsaturated aldehyde. J Colloid Interface Sci 2021; 596:34-43. [PMID: 33839359 DOI: 10.1016/j.jcis.2021.03.137] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/17/2021] [Accepted: 03/24/2021] [Indexed: 11/26/2022]
Abstract
Ceria has been widely used as catalyst support displaying a size- or shape-dependent catalytic performance due to the strong metal-support interaction (SMSI) effect with active metal. Almost all the studies on the SMSI effect of ceria-supported metal catalysts are involved generally in gas-phase reaction, but rarely in the liquid-phase reaction system. In this work, Cu/CeO2-P (copper loaded on nano-polyhedral CeO2 with (111) terminated surface) was investigated its catalytic performance on liquid-phase hydrogenation and studied the SMSI effect by comparing with the catalysts supported on nano-rod and nano-cube CeO2. It was found that Cu was highly dispersed on the external surface of ceria in the Cu/CeO2-P catalyst via a moderate SMSI effect. Furthermore, the degree of the interaction showed great influence on the chemical state of Cu species, and the ratio of (Cu++Cu0)/Cu2+ in Cu/CeO2-P was higher than Cu/CeO2-R (Cu loaded on nano-rod CeO2 with (110) plane) and Cu/CeO2-C (Cu loaded on nano-cube CeO2 with (100) facet). As a result, the Cu/CeO2-P catalyst showed the best catalytic performance among three types of catalysts. Based on series of catalytic investigations, the catalytic performance in liquid-phase hydrogenation was intrinsically relevant to the crystal plane effect and reduced Cu proportion induced by an appropriate SMSI effect, which was completely different from gas-phase hydrogenation.
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Affiliation(s)
- Zhi Hu
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
| | - Zidan Zou
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
| | - Aidi Xie
- University of Science and Technology of China, Hefei 230026, China
| | - Chun Chen
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
| | - Xiaoguang Zhu
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Yunxia Zhang
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Haimin Zhang
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Huijun Zhao
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University, Queensland 4222, Australia
| | - Guozhong Wang
- Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
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Chen WF, Malacco CMDS, Mehmood R, Johnson KK, Yang JL, Sorrell CC, Koshy P. Impact of morphology and collagen-functionalization on the redox equilibria of nano ceria for cancer therapies. Mater Sci Eng C Mater Biol Appl 2021; 120:111663. [PMID: 33545829 DOI: 10.1016/j.msec.2020.111663] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/29/2020] [Accepted: 10/20/2020] [Indexed: 01/24/2023]
Abstract
The application of nanoparticulate therapies for cancer depends largely on the uptake and redox activity of the particles. The present work reports the fabrication of different morphologies of nanoceria (CeO2-x) as nanooctahedra (NO), nanorods (NR), and nanocubes (NC) by hydrothermal synthesis at different temperatures (100 °C, 180 °C) of solutions of 0.05 M Ce(NO3)3·6H2O and different concentrations of NaOH (0.01 M, 6.00 M). The characteristics of these nanomorphologies are compared in terms of the crystallinity (XRD), grain size (TEM), surface area (BET), tendency to agglomerate, and the oxygen vacancy concentration ([VO••]) as reflected by the [Ce3+]/[Ce4+] ratio (XPS). The effects of these parameters on the potential cellular uptake are canvassed, suggesting that the nonpolarity of the {111} planes of NO and NR facilitate the preferential uptake of these nanomorphologies. These experimental variables then were normalized through the use of NC as a model substrate for the functionalization using gum arabic (GA) and collagen in order to assess their roles in enhancing redox activity. Both the unfunctionalized and functionalized NC were noncytotoxic in in vitro tests with Kuramochi ovarian cancer cells. However, the antioxidant behavior of the collagen-functionalized NC was superior to that of the unfunctionalized NC, which was superior to that of the controls. These results demonstrate that, while the intrinsic VO•• of CeO2-x enhance the destruction of reactive oxygen species (ROS), functionalization by gum arabic and collagen crosslinking as extrinsic additions to the system enhances ROS destruction to an even greater extent. The antioxidant behavior and potential to neutralize superoxide and hydroxyl radicals of these materials offers new potential for the improvement of nanoparticulate cancer therapies.
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Affiliation(s)
- Wen-Fan Chen
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia; Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | | | - Rashid Mehmood
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia; School of Chemical Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Kochurani K Johnson
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Jia-Lin Yang
- Prince of Wales Clinical School, Lowy Cancer Research Centre, School of Medical Sciences, UNSW Sydney, Sydney, NSW 2052, Australia
| | | | - Pramod Koshy
- School of Materials Science and Engineering, UNSW Sydney, Sydney, NSW 2052, Australia.
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Caddeo F, Casu A, Loche D, Morgan LM, Mountjoy G, O'Regan C, Casula MF, Hayama S, Corrias A, Falqui A. Thermally stable surfactant-free ceria nanocubes in silica aerogel. J Colloid Interface Sci 2021; 583:376-84. [PMID: 33011407 DOI: 10.1016/j.jcis.2020.09.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/01/2020] [Accepted: 09/12/2020] [Indexed: 11/23/2022]
Abstract
Surfactant-mediated chemical routes allow one to synthesize highly engineered shape- and size-controlled nanocrystals. However, the occurrence of capping agents on the surface of the nanocrystals is undesirable for selected applications. Here, a novel approach to the production of shape-controlled nanocrystals which exhibit high thermal stability is demonstrated. Ceria nanocubes obtained by surfactant-mediated synthesis are embedded inside a highly porous silica aerogel and thermally treated to remove the capping agent. Powder X-ray Diffraction and Scanning Transmission Electron Microscopy show the homogeneous dispersion of the nanocubes within the aerogel matrix. Remarkably, both the size and the shape of the ceria nanocubes are retained not only throughout the aerogel syntheses but also upon thermal treatments up to 900 °C, while avoiding their agglomeration. The reactivity of ceria is measured by in situ High-Energy Resolution Fluorescence Detected - X-ray Absorption Near Edge Spectroscopy at the Ce L3 edge, and shows the reversibility of redox cycles of ceria nanocubes when they are embedded in the aerogel. This demonstrates that the enhanced reactivity due to their prominent {100} crystal facets is preserved. In contrast, unsupported ceria nanocubes begin to agglomerate as soon as the capping agent decomposes, leading to a degradation of their reactivity already at 275 °C.
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Geng Y, Jin K, Mei J, Su G, Ma L, Yang S. CeO 2 grafted with different heteropoly acids for selective catalytic reduction of NO x with NH 3. J Hazard Mater 2020; 382:121032. [PMID: 31557576 DOI: 10.1016/j.jhazmat.2019.121032] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/14/2019] [Accepted: 08/16/2019] [Indexed: 06/10/2023]
Abstract
The CeO2 catalysts grafted with heteropoly acid (i.e., HPA) could enhance their catalytic performance for selective catalytic reduction of NOx with NH3 (NH3-SCR). In comparison to HSiW/CeO2, HPMo/CeO2, and commercial V2O5-WO3/TiOx catalysts, HPW/CeO2 catalysts showed the best SCR performance. XPS and DRIFTS demonstrated that the amount of HPA on HPW/CeO2 was more than those on HSiW/CeO2 and HPMo/CeO2. H2-TPR results indicated that reducibility of HPMo/CeO2 was stronger than those of HSiW/CeO2 and HPW/CeO2, resulting in the high-temperature performance loss. According to kinetic results, below 250 °C, kSCR-ER and kSCR-LH of HPW/CeO2 were higher than those of HSiW/CeO2, meanwhile kside of both HSiW/CeO2 and HPW/CeO2 were low. Therefore, HPW/CeO2 had the better SCR performance than HSiW/CeO2. As NH3 was completely consumed, SCR activity depended on the ratio of SCR reaction in the consumption of NH3. The selectivity of SCR reaction, NSCR reaction, and C-O reaction of HSiW/CeO2 were almost the same as those of HPW/CeO2 above 250 °C, resulting in the NOx conversion of HPW/CeO2 was basically the same as that of HSiW/CeO2 above 250 °C. Due to the lowest kSCR-ER and kSCR-LH, and highest kside, NOx conversion of HPMo/CeO2 was the worst compared to HSiW/CeO2 and HPW/CeO2 catalysts.
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Affiliation(s)
- Yang Geng
- Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 PR China; Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kai Jin
- Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China
| | - Jian Mei
- Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China
| | - Guanyong Su
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 PR China
| | - Lei Ma
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Shijian Yang
- Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 PR China.
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Sriram G, Uthappa UT, Rego RM, Kigga M, Kumeria T, Jung HY, Kurkuri MD. Ceria decorated porous diatom-xerogel as an effective adsorbent for the efficient removal of Eriochrome Black T. Chemosphere 2020; 238:124692. [PMID: 31545214 DOI: 10.1016/j.chemosphere.2019.124692] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/21/2019] [Accepted: 08/26/2019] [Indexed: 06/10/2023]
Abstract
Diatomaceous earth or diatom (DE) are naturally available and low cost micro particles with distinct porous structure were used as an adsorbent for the removal of a hazardous dye, Eriochrome Black T (EBT). The surface modification of these DE were performed by sol-gel and hydrothermal methods to obtain a series of adsorbents such as diatom-ceria (DC), diatom-silica xerogel (DX), and diatom-silica xerogel-ceria (DXC). A cauliflower like morphology structure of ceria was observed on DE and DX. The adsorption performance of EBT was conducted by varying various parameters such as pH, adsorbent dosage, initial concentration, contact time and ionic strength. The materials DE, DC, DX and DXC showed the EBT removal efficiencies of 52, 77, 20, and 93%, respectively. The maximum adsorption capacity (qm) of DE, DC, DX and DXC was found to be 13.83, 23.64, 0.2 and 47.02 mgg-1 for the adsorption of EBT, respectively. The selectivity of EBT towards DXC was evaluated by treating a mixture of anionic dyes. The dye removal experiments was performed in presence of inorganic salts, however the presence of these salts did not affect the removal efficiency of DXC. Furthermore, the reusability of DXC was studied by recycling it up to 5 times and even at 5th cycle a removal efficiency of ∼66.8% was found. Thus, these studies demonstrate that the DXC material could be a promising candidate for the removal of EBT via adsorption for real time application in water treatment.
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Affiliation(s)
- Ganesan Sriram
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, 562112, Karnataka, India
| | - U T Uthappa
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, 562112, Karnataka, India
| | - Richelle M Rego
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, 562112, Karnataka, India
| | - Madhuprasad Kigga
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, 562112, Karnataka, India.
| | - Tushar Kumeria
- School of Pharmacy, The University of Queensland, Queensland, 4102, Australia
| | - Ho-Young Jung
- Department of Environment and Energy Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea
| | - Mahaveer D Kurkuri
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bengaluru, 562112, Karnataka, India.
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Zoleta JB, Itao GB, Resabal VJT, Lubguban AA, Corpuz RD, Ito M, Hiroyoshi N, Tabelin CB. Improved pyrolysis behavior of ammonium polyphosphate-melamine-expandable (APP-MEL-EG) intumescent fire retardant coating system using ceria and dolomite as additives for I-beam steel application. Heliyon 2020; 6:e03119. [PMID: 31909279 DOI: 10.1016/j.heliyon.2019.e03119] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 08/05/2019] [Accepted: 12/20/2019] [Indexed: 11/28/2022] Open
Abstract
This study describes the effects of ceria (CeO2) and dolomite [CaMg(CO3)2] additives on the pyrolysis behavior and fire resistive property of conventional intumescent flame retardant (IFR) coating system for I-beam steel substrate called ammonium polyphosphate-melamine-expandable graphite (APP-MEL-EG) system. The fire resistance of various formulations was evaluated using the standard vertical Bunsen burner fire test. Thermogravimetric analysis (TGA) was used to understand the degradation of coating formulations. Observations by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) demonstrated that significant amounts of additives favored the formation of homogeneous compacted char structures, which were predominantly composed of carbon (C), phosphorus (P) and oxygen (O). These three main components of the char were also found to be in various binding combinations with other lighter elements like nitrogen (N) and hydrogen (H) as illustrated by the attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy results. X-ray photoelectron spectroscopy (XPS) further suggest that polyethylene([(CH2–C2H2–CH2)n−]) free radicals were abundant on the char surface for the two best formulations and the binding energy of this radical promoted the formation of aromatic carbon chains that enhanced the char's thermal stability. This means that the selection of appropriate additives and combinations of flame-retardant ingredients could significantly change the morphology of the char layer and improve its thermal stability during fire exposure.
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Dong W, Huang Y. CeO 2/C nanowire derived from a cerium(III) based organic framework as a peroxidase mimic for colorimetric sensing of hydrogen peroxide and for enzymatic sensing of glucose. Mikrochim Acta 2019; 187:11. [PMID: 31802246 DOI: 10.1007/s00604-019-4032-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 11/11/2019] [Indexed: 10/25/2022]
Abstract
A metal organic framework obtained from cerium(III) and trimesic acid was pyrolyzed to obtain a novel nanostructure referred to as CeO2/C nanowires. The experimental parameters temperature, precursor and gas atmosphere were optimized. The nanowires show good dispersion and a large number of oxygen vacancies, and this leads to excellent peroxidase-like activity. The nanowires are stable at pH values between 2 and 10, and in the 4-80 °C temperature range. The peroxidase-mimicking activity was exploited in a sensitive colorimetric method for determination of H2O2 by using 3,3',5,5'-tetramethylbenzidine as the chromogenic substrate. The absorbance at 652 nm increases linearly in the 0.5 to 100 μM H2O2 concentration range. If glucose oxidase is added to a solution containing glucose, H2O2 will be enzymatically produced. This was exploited to design a new method for determination of glucose. The optical response is linear in the 1-100 μM glucose concentration range, and the detection limit is 0.69 μM (at S/N = 3). The method was successfully applied to the determination of glucose in serum samples. Graphical abstractCeO2/C nanowires prepared by Ce-MOF pyrolysis show peroxidase-like activity and are able to catalyze the oxidation of tetramethylbenzidine (TMB) by H2O2. This was applied to glucose oxidase-based colorimetruc determination of glucose in human sera.
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Affiliation(s)
- Wenfei Dong
- The Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.,The Key Laboratory of Chongqing Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Yuming Huang
- The Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
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Pan P, Fan J, Wang X, Wang J, Zheng D, Cheng H, Zhang X. Bio-Orthogonal Bacterial Reactor for Remission of Heavy Metal Poisoning and ROS Elimination. Adv Sci (Weinh) 2019; 6:1902500. [PMID: 31871876 PMCID: PMC6918106 DOI: 10.1002/advs.201902500] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 10/06/2019] [Indexed: 05/02/2023]
Abstract
Multitudinous industrial products in daily life put human health at risk of heavy metal exposure, and natural bacteria have displayed superior performance in bioadsorption and biodegradation of heavy metal. In this study, a bacteria-based bioreactor is developed to precisely bioadsorb lead (Pb) ions, eliminate concomitant reactive oxygen species (ROS), and remit the injury of acute/chronic Pb poisoning. A nonpathogenic bacteria Escherichia coli MG1655 (Bac) is decorated with antioxidative cerium oxide nanoparticles (Ceria) on the surface through a bio-orthogonal reaction, and the complex bioreactor could spontaneously aggregate in organs with high concentration of Pb. Furthermore, the excess Pb is bioadsorbed by bacteria and the concomitant ROS is eliminated by Ceria nanoparticles. In vitro and in vivo studies demonstrate that this integral biotic/abiotic hybrid bioreactor successfully realizes detoxication of Pb and reparation of injury, also accompanied with inappreciable side effects.
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Affiliation(s)
- Pei Pan
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
| | - Jin‐Xuan Fan
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
| | - Xia‐Nan Wang
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
| | - Jia‐Wei Wang
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
| | - Di‐Wei Zheng
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
| | - Han Cheng
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
| | - Xian‐Zheng Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education and Department of ChemistryWuhan UniversityWuhan430072P. R. China
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Li X, Qi M, Sun X, Weir MD, Tay FR, Oates TW, Dong B, Zhou Y, Wang L, Xu HH. Surface treatments on titanium implants via nanostructured ceria for antibacterial and anti-inflammatory capabilities. Acta Biomater 2019; 94:627-643. [PMID: 31212111 DOI: 10.1016/j.actbio.2019.06.023] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 05/13/2019] [Accepted: 06/14/2019] [Indexed: 01/05/2023]
Abstract
Peri-implantitis is the most common risk factor for dental implant failure. Nanostructured ceria (nano-CeO2) has anti-inflammatory and antibacterial functions, and different shapes of ceria enclosed by specific crystal planes could be an effective approach to enhance intrinsic catalysis. In the present study, the authors developed a novel implant surface-modification strategy by coating different shapes of nano-CeO2 onto titanium (Ti) surfaces to enhance their antibacterial and anti-inflammatory properties. The objectives of the study were to: (1) develop novel Ti surfaces modified with different shapes of nano-CeO2 (nanorod, nanocube and nano-octahedron) for peri-implantitis prevention; (2) investigate and compare the inhibition efficacy of different shapes of CeO2-modified surfaces against biofilms of peri-implantitis-related pathogens; and (3) evaluate the different CeO2-modified surfaces on cell inflammatory response in vitro and in vivo. The results showed that nanorod CeO2-modified Ti had more bacteria attachment of Streptococcus sanguinis in the early stage, compared with other CeO2-modified Ti (p < 0.05). They all exhibited similarly substantial CFU reductions against peri-implantitis-related biofilms (p > 0.1). Nanocube and nano-octahedron CeO2-modified Ti exerted much better anti-inflammatory effects and ROS-scavenging ability than nanorod CeO2in vitro (p < 0.05). In vivo, the mean mRNA expression of TNF-α, IL-6 and IL-1β in the tissues around Ti was decreased by the three shapes of nano-CeO2; nano-octahedron CeO2 showed the strongest anti-inflammatory effect among all groups (p < 0.05). In conclusion, all three types of CeO2-modified Ti exerted equally strong antibacterial properties; nano-octahedron CeO2-modified Ti had the best anti-inflammatory effect. Therefore, CeO2-modified Ti surfaces are highly promising for enhancing antimicrobial functions for dental implants. Novel nano-octahedron CeO2 coating on Ti had great therapeutic potential for alleviating and eliminating peri-implantitis. STATEMENT OF SIGNIFICANCE: Peri-implantitis is the most common risk factor for dental implant failure. Nanostructured ceria (nano-CeO2) has anti-inflammatory and antibacterial functions, and different shapes of ceria enclosed by specific crystal planes could be an effective approach to enhance intrinsic catalysis. In the present study, we developed a novel implant surface-modification strategy by coating different shapes of nano-CeO2 onto titanium surfaces to enhance their antibacterial and anti-inflammatory properties for dental implants. In addition, we found that the nano-octahedron CeO2 coating on titanium would have great therapeutic potential for alleviating and eliminating peri-implantitis.
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Kashinath L, Namratha K, Byrappa K. Microwave mediated synthesis and characterization of CeO 2-GO hybrid composite for removal of chromium ions and its antibacterial efficiency. J Environ Sci (China) 2019; 76:65-79. [PMID: 30528036 DOI: 10.1016/j.jes.2018.03.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Revised: 03/20/2018] [Accepted: 03/21/2018] [Indexed: 05/27/2023]
Abstract
A facile fabrication and processing of cerium oxide-graphene oxide (CeO2-GO) hybrid nanocomposites without the use of any surfactant or any organic solvents using chemical method and treatment with microwave irradiation technique are reported. In-situ hexagonal nano cerium oxide particles embedded on the layered surface of GO sheets were investigated for the photodegradation of dyes, removal of chromium Cr(VI) ions and against antibacterial studies. The results imply that hybrid nanocomposites shows enhanced 5-folds of photocatalytic activities in UV (ultraviolet) light irradiation and exhibited rapid efficiency in the elimination of chromium ion better than the pure GO and CeO2, which are inhibited by competent photosensitive electron inoculation and controlling the electron-hole recombination. The synergetic effect of CeO2-GO composites played a vital role in showing better results against model bacterium than GO and CeO2 are due to higher physical interaction endorsed to the stress of membranes acute by piercing edges, large surface area, and higher adsorptive conditions of graphene oxide sheets tailored with ceria particles. The amount of charge transferred at the interface increases with the concentration of O atoms, demonstrating the interaction between CeO2 and GO is much stronger than CeO2 and GO are due to the decrease of the average equilibrium distance between the interfaces. The CeO2-GO interface staggered band alignments existing between the CeO2 surfaces and GO which shows an excellent synergism. The structure and morphology of composites were tested by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman, X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscope (HR-TEM).
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Affiliation(s)
- Lellala Kashinath
- Department of studies in Earth Science, Mansagangothri, University of Mysore, Mysore 570006, India; Centre for Materials Science and Technology, Vijana Bhavan, Manasagangothri, University of Mysore, Mysore 570006, India
| | - Keerthiraj Namratha
- Department of studies in Earth Science, Mansagangothri, University of Mysore, Mysore 570006, India; Centre for Materials Science and Technology, Vijana Bhavan, Manasagangothri, University of Mysore, Mysore 570006, India
| | - Kullaiah Byrappa
- Department of studies in Earth Science, Mansagangothri, University of Mysore, Mysore 570006, India; Centre for Materials Science and Technology, Vijana Bhavan, Manasagangothri, University of Mysore, Mysore 570006, India.
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Nascimento LF, Lima JF, de Sousa Filho PC, Serra OA. Effect of lanthanum loading on nanosized CeO 2-ZnO solid catalysts supported on cordierite for diesel soot oxidation. J Environ Sci (China) 2018; 73:58-68. [PMID: 30290872 DOI: 10.1016/j.jes.2018.01.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 01/11/2018] [Accepted: 01/16/2018] [Indexed: 06/08/2023]
Abstract
We report the application of a solid lanthanum-ceria-zinc catalyst in the catalytic regeneration of diesel particulate filters (DPF) in diesel engines. We synthesized a CeO2-ZnO-La2O3 (Ce-Zn-La) mixed oxide by a lactic acid-mediated sol-gel method, which efficiently coated cordierite substrates for soot capture and combustion. We studied the effects of La loading on the physicochemical and catalytic properties of Ce-Zn mixed oxide during low-temperature soot combustion processes. We characterized the synthesized catalysts by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), N2 adsorption, Raman spectroscopy, oxygen storage capacity (OSC), and scanning and transmission electron microscopy (SEM and TEM). Thermogravimetric and differential thermal analysis (TGA/DTA) confirmed that the catalysts effectively reduced the soot oxidation temperature. The ternary Ce-Zn-La mixed oxide catalyst with Ce/Zn/La atomic ratio of 2:1:0.5 had the highest catalytic activity and promoted soot oxidation at temperatures below 390°C. This indicated that the large number of oxygen vacancies in the catalyst structure generated oxygen species at low temperatures. Raman spectroscopy measurements revealed the presence of oxygen vacancies and lattice defects in Ce-Zn-La samples, which were key parameters concerning the stability and redox properties of the prepared catalysts.
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Affiliation(s)
| | - Juliana Fonseca Lima
- Institute of Chemistry, Rio de Janeiro State University, 20550-900 Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Osvaldo Antonio Serra
- Department of Chemistry, FFCLRP, University of São Paulo, 14040-901 Ribeirão Preto, São Paulo, Brazil; Center of Natural and Human Sciences, Federal Univerty of ABC, 09210-580, Santo André, São Paulo, Brazil
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Zhu KJ, Wang F, Teng BT, Wen XD, Fan M, Liu XN. A new insight into the theoretical design of highly dispersed and stable ceria supported metal nanoparticles. J Colloid Interface Sci 2018; 512:775-783. [PMID: 29112928 DOI: 10.1016/j.jcis.2017.09.098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 09/21/2017] [Accepted: 09/27/2017] [Indexed: 10/18/2022]
Abstract
How to design and develop ceria supported metal nanoparticles (M/CeO2) catalysts with high performance and sintering resistance is a great challenge in heterogeneous catalysis and surface science. In the present work, we propose two ways to improve the anti-sintering capability of M/CeO2 catalysts. One is to introduce Ti atom on CeO2 (1 1 1) to form monatomically dispersed Ti, TiOx or TiO2-like species on ceria. Density functional theory calculations show that the much stronger interactions between Au and Ti modified CeO2 (1 1 1) occur compared with that on CeO2 (1 1 1). According to the electronic analysis, the strong interactions are attributed to the electron transfer from the Ti modified ceria substrate to Au. The other is to dope Ti into CeO2 (1 1 1) to form TixCe1-xO2. This also leads to the interaction enhancement between Au and TixCe1-xO2 (1 1 1). Electronic analysis indicates that the charge protuberance of surface O atoms near Ti atom results in the strong interactions between metal and ceria. This work provides new ideas for preparing M/CeO2 catalysts with high dispersity and stability, and sheds light into the theoretical design of catalysts.
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Affiliation(s)
- Kong-Jie Zhu
- College of Chemistry and Life Sciences, Zhejiang Normal University, Key Lab of Advanced Catalytic Materials of Ministry of Education, Jinhua 321004, China
| | - Fang Wang
- College of Chemistry and Life Sciences, Zhejiang Normal University, Key Lab of Advanced Catalytic Materials of Ministry of Education, Jinhua 321004, China
| | - Bo-Tao Teng
- College of Chemistry and Life Sciences, Zhejiang Normal University, Key Lab of Advanced Catalytic Materials of Ministry of Education, Jinhua 321004, China.
| | - Xiao-Dong Wen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
| | - Maohong Fan
- Department of Chemical & Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA
| | - Xiao-Na Liu
- College of Chemistry and Life Sciences, Zhejiang Normal University, Key Lab of Advanced Catalytic Materials of Ministry of Education, Jinhua 321004, China
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Clar JG, Platten WE, Baumann EJ, Remsen A, Harmon SM, Bennett-Stamper CL, Thomas TA, Luxton TP. Dermal transfer and environmental release of CeO 2 nanoparticles used as UV inhibitors on outdoor surfaces: Implications for human and environmental health. Sci Total Environ 2018; 613-614:714-723. [PMID: 28938214 PMCID: PMC6738344 DOI: 10.1016/j.scitotenv.2017.09.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/05/2017] [Accepted: 09/06/2017] [Indexed: 05/30/2023]
Abstract
A major area of growth for "nano-enabled" consumer products have been surface coatings, including paints stains and sealants. Ceria (CeO2) nanoparticles (NPs) are of interest as they have been used as additives in these these products to increase UV resistance. Currently, there is a lack of detailed information on the potential release, and speciation (i.e., ion vs. particle) of CeO2 NPs used in consumer-available surface coatings during intended use scenarios. In this study, both Micronized-Copper Azole pressure-treated lumber (MCA), and a commercially available composite decking were coated with CeO2 NPs dispersed in Milli-Q water or wood stain. Coated surfaces were divided into two groups. The first was placed outdoors to undergo environmental weathering, while the second was placed indoors to act as experimental controls. Both weathered surfaces and controls were sampled over a period of 6months via simulated dermal contact using methods developed by the Consumer Product Safety Commission (CPSC). The size and speciation of material released was determined through sequential filtration, total metals analysis, X-Ray Absorption Fine Structure Spectroscopy, and electron microscopy. The total ceria release from MCA coated surfaces was found to be dependent on dispersion matrix with aqueous applications releasing greater quantities of CeO2 than stain based applications, 66±12mg/m2 and 36±7mg/m2, respectively. Additionally, a substantial quantity of CeO2 was reduced to Ce(III), present as Ce(III)-organic complexes, over the 6-month experimental period in aqueous based applications.
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Affiliation(s)
- Justin G Clar
- National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, OH 45224, USA; Oak Ridge Institute for Science and Education (ORISE), Postdoctoral Research Associate, USA
| | | | | | - Andrew Remsen
- Pegasus Technical Services Inc., Cincinnati, OH, USA
| | - Steve M Harmon
- National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, OH 45224, USA
| | - Christina L Bennett-Stamper
- National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, OH 45224, USA
| | - Treye A Thomas
- U.S. Consumer Product Safety Commission, Office of Hazard Identification and Reduction, 4330 East West Highway, Bethesda, MD 20814, USA
| | - Todd P Luxton
- National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 5995 Center Hill Avenue, Cincinnati, OH 45224, USA.
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41
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Duchoň T, Hackl J, Höcker J, Veltruská K, Matolín V, Falta J, Cramm S, Nemšák S, Schneider CM, Flege JI, Senanayake SD. Exploiting micro-scale structural and chemical observations in real time for understanding chemical conversion: LEEM/PEEM studies over CeO x-Cu(111). Ultramicroscopy 2017; 183:84-8. [PMID: 28522241 DOI: 10.1016/j.ultramic.2017.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/31/2017] [Accepted: 05/09/2017] [Indexed: 11/21/2022]
Abstract
Proper consideration of length-scales is critical for elucidating active sites/phases in heterogeneous catalysis, revealing chemical function of surfaces and identifying fundamental steps of chemical reactions. Using the example of ceria thin films deposited on the Cu(111) surface, we demonstrate the benefits of multi length-scale experimental framework for understanding chemical conversion. Specifically, exploiting the tunable sampling and spatial resolution of photoemission electron microscopy, we reveal crystal defect mediated structures of inhomogeneous copper-ceria mixed phase that grow during preparation of ceria/Cu(111) model systems. The density of the microsized structures is such that they are relevant to the chemistry, but unlikely to be found during investigation at the nanoscale or with atomic level investigations. Our findings highlight the importance of accessing micro-scale when considering chemical pathways over heteroepitaxially grown model systems.
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Flege JI, Krisponeit JO, Höcker J, Hoppe M, Niu Y, Zakharov A, Schaefer A, Falta J, Krasovskii EE. Nanoscale analysis of the oxidation state and surface termination of praseodymium oxide ultrathin films on ruthenium(0001). Ultramicroscopy 2017; 183:61-66. [PMID: 28526269 DOI: 10.1016/j.ultramic.2017.05.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 04/18/2017] [Accepted: 05/09/2017] [Indexed: 10/19/2022]
Abstract
The complex structure and morphology of ultrathin praseodymia films deposited on a ruthenium(0001) single crystal substrate by reactive molecular beam epitaxy is analyzed by intensity-voltage low-energy electron microscopy in combination with theoretical calculations within an ab initio scattering theory. A rich coexistence of various nanoscale crystalline surface structures is identified for the as-grown samples, notably comprising two distinct oxygen-terminated hexagonal Pr2O3(0001) surface phases as well as a cubic Pr2O3(111) and a fluorite PrO2(111) surface component. Furthermore, scattering theory reveals a striking similarity between the electron reflectivity spectra of praseodymia and ceria due to very efficient screening of the nuclear charge by the extra 4f electron in the former case.
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Affiliation(s)
- J I Flege
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany; MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany.
| | - J-O Krisponeit
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany; MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany
| | - J Höcker
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - M Hoppe
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - Y Niu
- MAX IV Laboratory, Box 118, 221 00 Lund, Sweden
| | - A Zakharov
- MAX IV Laboratory, Box 118, 221 00 Lund, Sweden
| | - A Schaefer
- Division of Synchrotron Radiation Research, Lund University, 221 00 Lund, Sweden
| | - J Falta
- Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany; MAPEX Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany
| | - E E Krasovskii
- Departamento de Física de Materiales, Universidad del Pais Vasco UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain; Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain; IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
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43
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Rodrigues CP, Zonetti PDC, Appel LG. Chemicals from ethanol: the acetone synthesis from ethanol employing Ce 0.75Zr 0.25O 2, ZrO 2 and Cu/ZnO/Al 2O 3. Chem Cent J 2017; 11:30. [PMID: 29086821 PMCID: PMC5380649 DOI: 10.1186/s13065-017-0249-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Accepted: 02/20/2017] [Indexed: 11/18/2022] Open
Abstract
Acetone is an important solvent and widely used in the synthesis of drugs and polymers. Currently, acetone is mainly generated by the Cumene Process, which employs benzene and propylene as fossil raw materials. Phenol is a co-product of this synthesis. However, this ketone can be generated from ethanol (a renewable feedstock) in one-step. The aim of this work is to describe the influence of physical–chemical properties of three different catalysts on each step of this reaction. Furthermore, contribute to improve the description of the mechanism of this synthesis. The acetone synthesis from ethanol was studied employing Cu/ZnO/Al2O3, Ce0.75Zr0.25O2 and ZrO2. It was verified that the acidity of the catalysts needs fine-tuning in order to promote the oxygenate species adsorption and avoid the dehydration of ethanol. The higher the reducibility and the H2O dissociation activity of the catalysts are, the higher the selectivity to acetone is. In relation to the oxides, these properties are associated with the presence of O vacancies. The H2 generation, which occurs during the TPSR, indicates the redox character of this synthesis. The main steps of the acetone synthesis from ethanol are the generation of acetaldehyde, the oxidation of this aldehyde to acetate species (which reduces the catalyst), the H2O dissociation, the oxidation of the catalyst producing H2, and, finally, the ketonization reaction. These pieces of information will support the development of active catalysts for not only the acetone synthesis from ethanol, but also the isobutene and propylene syntheses in which this ketone is an intermediate.Acetone from ethanol. ![]()
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Affiliation(s)
- Clarissa Perdomo Rodrigues
- Divisão de Catálise e Processos Químicos, Instituto Nacional de Tecnologia, Av. Venezuela 82/518, Saúde, Rio de Janeiro, RJ, CEP 21081-312, Brazil
| | - Priscila da Costa Zonetti
- Divisão de Catálise e Processos Químicos, Instituto Nacional de Tecnologia, Av. Venezuela 82/518, Saúde, Rio de Janeiro, RJ, CEP 21081-312, Brazil
| | - Lucia Gorenstin Appel
- Divisão de Catálise e Processos Químicos, Instituto Nacional de Tecnologia, Av. Venezuela 82/518, Saúde, Rio de Janeiro, RJ, CEP 21081-312, Brazil.
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Liang Y, Huang Y, Zhang H, Lan L, Zhao M, Gong M, Chen Y, Wang J. Interactional effect of cerium and manganese on NO catalytic oxidation. Environ Sci Pollut Res Int 2017; 24:9314-9324. [PMID: 28233199 DOI: 10.1007/s11356-017-8645-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 02/15/2017] [Indexed: 06/06/2023]
Abstract
To preferably catalyze the oxidation of NO to NO2 in diesel after-treatment system, a series of CeO2-MnO x composite oxides was supported on silica-alumina material by the co-impregnation method. The maximum conversion of NO of the catalyst with a Ce/Mn weight ratio of 5:5 was improved by around 40%, compared to the supported manganese-only or cerium-only sample. And its maximum reaction rate was 0.056 μmol g-1 s-1 at 250 °C at the gas hourly space velocity of 30,000 h-1. The experimental results suggested that Ce-Mn solid solution was formed, which could modulate the valence state of cerium and manganese and exhibit great redox properties. Moreover, the strong interaction between ceria and manganese resulted in the largest desorption amount of strong chemical oxygen and oxygen vacancies, leading to the maximum O α area ratio of 62.26% from the O 1s result. These effective oxygen species could be continually transferred to the surface, leading to the best NO catalytic activity of 5Ce5Mn/SA catalyst. Graphical abstract.
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Affiliation(s)
- Yanli Liang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Yufen Huang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Hailong Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Li Lan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Ming Zhao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Maochu Gong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Yaoqiang Chen
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China
| | - Jianli Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Wangjiang Road 29, Chengdu, Sichuan, 610064, China.
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Priester JH, Moritz SC, Espinosa K, Ge Y, Wang Y, Nisbet RM, Schimel JP, Susana Goggi A, Gardea-Torresdey JL, Holden PA. Damage assessment for soybean cultivated in soil with either CeO 2 or ZnO manufactured nanomaterials. Sci Total Environ 2017; 579:1756-1768. [PMID: 27939199 DOI: 10.1016/j.scitotenv.2016.11.149] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 11/21/2016] [Accepted: 11/21/2016] [Indexed: 05/27/2023]
Abstract
With increasing use, manufactured nanomaterials (MNMs) may enter soils and impact agriculture. Herein, soybean (Glycine max) was grown in soil amended with either nano-CeO2 (0.1, 0.5, or 1.0gkg-1 soil) or nano-ZnO (0.05, 0.1, or 0.5gkg-1 soil). Leaf chlorosis, necrosis, and photosystem II (PSII) quantum efficiency were monitored during plant growth. Seed protein and protein carbonyl, plus leaf chlorophyll, reactive oxygen species (ROS), lipid peroxidation, and genotoxicity were measured for plants at harvest. Neither PSII quantum efficiency, seed protein, nor protein carbonyl indicated negative MNM effects. However, increased ROS, lipid peroxidation, and visible damage, along with decreased total chlorophyll concentrations, were observed for soybean leaves in the nano-CeO2 treatments. These effects correlated to aboveground leaf, pod, and stem production, and to root nodule N2 fixation potential. Soybeans grown in soil amended with nano-ZnO maintained growth, yield, and N2 fixation potential similarly to the controls, without increased leaf ROS or lipid peroxidation. Leaf damage was observed for the nano-ZnO treatments, and genotoxicity appeared for the highest nano-ZnO treatment, but only for one plant. Total chlorophyll concentrations decreased with increasing leaf Zn concentration, which was attributable to zinc complexes-not nano-ZnO-in the leaves. Overall, nano-ZnO and nano-CeO2 amended to soils differentially triggered aboveground soybean leaf stress and damage. However, the consequences of leaf stress and damage to N2 fixation, plant growth, and yield were only observed for nano-CeO2.
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Affiliation(s)
- John H Priester
- Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States
| | - Shelly Cole Moritz
- Earth Research Institute, University of California, Santa Barbara, CA 93106, United States
| | - Katherine Espinosa
- Department of Agronomy, Iowa State University, Ames, IA 50011, United States
| | - Yuan Ge
- Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States
| | - Ying Wang
- Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States
| | - Roger M Nisbet
- Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States; Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, United States
| | - Joshua P Schimel
- Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States; Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA 93106, United States
| | - A Susana Goggi
- Department of Agronomy, Iowa State University, Ames, IA 50011, United States
| | - Jorge L Gardea-Torresdey
- University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States; Department of Chemistry, University of Texas at El Paso, El Paso, TX 79968, United States
| | - Patricia A Holden
- Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States; University of California Center for the Environmental Implications of Nanotechnology, University of California, Santa Barbara, CA 93106, United States.
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46
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Bensaid S, Piumetti M, Novara C, Giorgis F, Chiodoni A, Russo N, Fino D. Catalytic Oxidation of CO and Soot over Ce-Zr-Pr Mixed Oxides Synthesized in a Multi-Inlet Vortex Reactor: Effect of Structural Defects on the Catalytic Activity. Nanoscale Res Lett 2016; 11:494. [PMID: 27830571 PMCID: PMC5102989 DOI: 10.1186/s11671-016-1713-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 11/01/2016] [Indexed: 06/06/2023]
Abstract
In the present work, ceria, ceria-zirconia (Ce = 80 at.%, Zr = 20 at.%), ceria praseodymia (Ce = 80 at.%, Pr = 20 at.%) and ceria-zirconia-praseodymia catalysts (Ce = 80 at.%, Zr = 10 at.% and Pr = 10 at.%) have been prepared by the multi-inlet vortex reactor (MIVR). For each set of samples, two inlet flow rates have been used during the synthesis (namely, 2 ml min-1, and 20 ml min-1) in order to obtain different particle sizes. Catalytic activity of the prepared materials has been investigated for CO and soot oxidation reactions. As a result, when the catalysts exhibit similar crystallite sizes (in the 7.7-8.8 nm range), it is possible to observe a direct correlation between the Ov/F2g vibrational band intensity ratios and the catalytic performance for the CO oxidation. This means that structural (superficial) defects play a key role for this process. The incorporation of Zr and Pr species into the ceria lattice increases the population of structural defects, as measured by Raman spectroscopy, according to the order: CeO2 < Ce80Zr20 < Ce80Zr10Pr10 < Ce80Pr20. On the other hand, the presence of zirconium and praseodymium into the ceria lattice does not have a direct beneficial effect on the soot oxidation activity for these catalysts, in contrast with nanostructured ones (e.g., Ce-Zr-O nanopolyhedra, Ce-Pr-O nanocubes) described elsewhere (Andana et al. Appl. Catal. B 197: 125-137, 2016; Piumetti et al., Appl Catal B 180: 271-282, 2016).
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Affiliation(s)
- Samir Bensaid
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Marco Piumetti
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy.
| | - Chiara Novara
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Fabrizio Giorgis
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Angelica Chiodoni
- Center for Sustainable Futures - CSF@POLITO, Istituto Italiano di Tecnologia, Corso Trento 21, Torino, 10129, Italy
| | - Nunzio Russo
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Debora Fino
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
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Andana T, Piumetti M, Bensaid S, Russo N, Fino D, Pirone R. CO and Soot Oxidation over Ce-Zr-Pr Oxide Catalysts. Nanoscale Res Lett 2016; 11:278. [PMID: 27255898 PMCID: PMC4889961 DOI: 10.1186/s11671-016-1494-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 05/23/2016] [Indexed: 05/14/2023]
Abstract
A set of ceria, ceria-zirconia (Ce 80 at.%, Zr 20 at.%), ceria-praseodymia (Ce 80 at.%, Pr 20 at.%) and ceria-zirconia-praseodymia (Ce 80 at.%, Zr 10 at.% and Pr 10 at.%) catalysts has been prepared by the solution combustion synthesis (SCS). The effects of Zr and Pr as dopants on ceria have been studied in CO and soot oxidation reactions. All the prepared catalysts have been characterized by complementary techniques, including XRD, FESEM, N2 physisorption at -196 °C, H2-temperature-programmed reduction, and X-ray photoelectron spectroscopy to investigate the relationships between the structure and composition of materials and their catalytic performance. Better results for CO oxidation have been obtained with mixed oxides (performance scale, Ce80Zr10Pr10 > Ce80Zr20 > Ce80Pr20) rather than pure ceria, thus confirming the beneficial role of multicomponent catalysts for this prototypical reaction. Since CO oxidation occurs via a Mars-van Krevelen (MvK)-type mechanism over ceria-based catalysts, it appears that the presence of both Zr and Pr species into the ceria framework improves the oxidation activity, via collective properties, such as electrical conductivity and surface or bulk oxygen anion mobility. On the other hand, this positive effect becomes less prominent in soot oxidation, since the effect of catalyst morphology prevails.
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Affiliation(s)
- Tahrizi Andana
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Marco Piumetti
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Samir Bensaid
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy.
| | - Nunzio Russo
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Debora Fino
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
| | - Raffaele Pirone
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
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48
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Aysu T, Maroto-Valer MM, Sanna A. Ceria promoted deoxygenation and denitrogenation of Thalassiosira weissflogii and its model compounds by catalytic in-situ pyrolysis. Bioresour Technol 2016; 208:140-148. [PMID: 26938809 DOI: 10.1016/j.biortech.2016.02.050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/10/2016] [Accepted: 02/11/2016] [Indexed: 06/05/2023]
Abstract
Pyrolysis of microcrystalline cellulose, egg white powder, palm-jojoba oils mixtures Thalassiosira weissflogii model compounds was performed with CeO2 at 500°C, to evaluate its catalytic upgrading mechanism. Light organics, aromatics and aliphatics were originated from carbohydrates, proteins and lipids, respectively. Dehydration and decarboxylation were the main reactions involved in the algae and model compounds deoxygenation, while nitrogen was removed as NH3 and HCN. CeO2 increased decarbonylation reactions compared to in absence of catalyst, with production of ketones. The results showed that the catalysts had a significant effect on the pyrolysis products composition of T. weissflogii. CeO2, NiCeAl2O3 and MgCe/Al2O3 catalysts increased the aliphatics and decreased the oxygen content in bio-oils to 6-7 wt% of the algae starting O2 content. Ceria catalysts were also able to consistently reduce the N-content in the bio-oil to 20-38% of that in the parent material, with NiCe/Al2O3 being the most effective.
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Affiliation(s)
- Tevfik Aysu
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK; Department of Chemistry, Faculty of Education, Yuzuncu Yil University, 65080 Van, Turkey
| | - M Mercedes Maroto-Valer
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
| | - Aimaro Sanna
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK.
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49
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Aysu T, Sanna A. Nannochloropsis algae pyrolysis with ceria-based catalysts for production of high-quality bio-oils. Bioresour Technol 2015; 194:108-116. [PMID: 26188553 DOI: 10.1016/j.biortech.2015.07.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Revised: 07/07/2015] [Accepted: 07/09/2015] [Indexed: 06/04/2023]
Abstract
Pyrolysis of Nannochloropsis was carried out in a fixed-bed reactor with newly prepared ceria based catalysts. The effects of pyrolysis parameters such as temperature and catalysts on product yields were investigated. The amount of bio-char, bio-oil and gas products, as well as the compositions of the resulting bio-oils was determined. The results showed that both temperature and catalyst had significant effects on conversion of Nannochloropsis into solid, liquid and gas products. The highest bio-oil yield (23.28 wt%) and deoxygenation effect was obtained in the presence of Ni-Ce/Al2O3 as catalyst at 500°C. Ni-Ce/Al2O3 was able to retain 59% of the alga starting energy in the bio-oil, compared to only 41% in absence of catalyst. Lower content of acids and oxygen in the bio-oil, higher aliphatics (62%), combined with HHV show promise for production of high-quality bio-oil from Nannochloropsis via Ni-Ce/Al2O3 catalytic pyrolysis.
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Affiliation(s)
- Tevfik Aysu
- Department of Chemistry, Faculty of Education, Yuzuncu Yil University, 65080 Van, Turkey; Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
| | - Aimaro Sanna
- Institute of Mechanical, Process and Energy Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
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Cobo M, Becerra J, Castelblanco M, Cifuentes B, Conesa JA. Catalytic hydrodechlorination of trichloroethylene in a novel NaOH/2-propanol/methanol/water system on ceria-supported Pd and Rh catalysts. J Environ Manage 2015; 158:1-10. [PMID: 25932562 DOI: 10.1016/j.jenvman.2015.04.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Revised: 04/21/2015] [Accepted: 04/23/2015] [Indexed: 06/04/2023]
Abstract
The catalytic hydrodechlorination (HDC) of high concentrations of trichloroethylene (TCE) (4.9 mol%, 11.6 vol%) was studied over 1%Pd, 1%Rh and 0.5%Pd-0.5%Rh catalysts supported on CeO2 under conditions of room temperature and pressure. For this, a one-phase system of NaOH/2-propanol/methanol/water was designed with molar percentages of 13.2/17.5/36.9/27.6, respectively. In this system, the alcohols delivered the hydrogen required for the reaction through in-situ dehydrogenation reactions. PdRh/CeO2 was the most active catalyst for the degradation of TCE among the evaluated materials, degrading 85% of the trichloroethylene, with alcohol dehydrogenation rates of 89% for 2-propanol and 83% for methanol after 1 h of reaction. Fresh and used catalysts were characterized by Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Thermogravimetric analysis (TGA). These results showed important differences of the active phase in each catalyst sample. Rh/CeO2 had particle sizes smaller than 1 nm and the active metal was partially oxidized (Rh(0)/Rh(+δ) ratio of 0.43). This configuration showed to be suitable for alcohols dehydrogenation. On the contrary, Pd/CeO2 showed a Pd completed oxidized and with a mean particle size of 1.7 nm, which seemed to be unfavorable for both, alcohols dehydrogenation and TCE HDC. On PdRh/CeO2, active metals presented a mean particle size of 2.7 nm and more reduced metallic species, with ratios of Rh(0)/Rh(+δ) = 0.67 and Pd(0)/Pd(+δ) = 0.28, which showed to be suitable features for the TCE HDC. On the other hand, TGA results suggested some deposition of NaCl residues over the catalyst surfaces. Thus, the new reaction system using PdRh/CeO2 allowed for the degradation of high concentrations of the chlorinated compound by using in situ hydrogen liquid donors in a reaction at room temperature and pressure.
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Affiliation(s)
- Martha Cobo
- Energy, Materials and Environment Laboratory, Department of Chemical Engineering, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá, Colombia.
| | - Jorge Becerra
- Energy, Materials and Environment Laboratory, Department of Chemical Engineering, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá, Colombia
| | - Miguel Castelblanco
- Energy, Materials and Environment Laboratory, Department of Chemical Engineering, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá, Colombia
| | - Bernay Cifuentes
- Energy, Materials and Environment Laboratory, Department of Chemical Engineering, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá, Colombia
| | - Juan A Conesa
- Department of Chemical Engineering, Universidad de Alicante, P.O. Box 99, E-03080 Alicante, Spain
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