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Chen S, Zhang X, Li D, Wang X, Hu B, Guo F, Hao L, Liu B. Strategies for improving photocatalytic performance of g-C 3N 4 by modulating charge separation and current research status. Heliyon 2024; 10:e35098. [PMID: 39165981 PMCID: PMC11333905 DOI: 10.1016/j.heliyon.2024.e35098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2024] [Revised: 07/18/2024] [Accepted: 07/23/2024] [Indexed: 08/22/2024] Open
Abstract
Graphitic carbon nitride (g-C3N4) has been extensively investigated over the past decade for its potential utilizations in photocatalytic energy generation and pollutant degradation. To better meeting the requirements for practical utilizations, it is crucial to address the issue of poor charge separation properties in g-C3N4, which origin from the strong interactions in photogenerated electron-hole pairs. In this review, we summarized the pertinent studies on developing strategies to promote the charge separation properties of g-C3N4. The strategies can be categorized into two categories of promoting the surface migration of charge carriers and prolonging the lifetime of surface charge. Finally, we present potential challenges in promoting charge separation and offer feasible suggestions to face these challenges.
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Affiliation(s)
- Shuangying Chen
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Xuliang Zhang
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
- Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Degang Li
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Xiaowen Wang
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Bingjie Hu
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Fushui Guo
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Liantao Hao
- Analysis and Testing Center, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
| | - Bo Liu
- Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, 266 Xincun Xi road, Zibo, 255000, PR China
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Dias DT, Rodrigues AO, Pires PB, Semianko BC, Fuziki MEK, Lenzi GG, Sabino SRF. Photoacoustic Spectroscopy of Titanium Dioxide, Niobium Pentoxide, Titanium:Niobium, and Ruthenium-Modified Oxides Synthesized Using Sol-Gel Methodology. APPLIED SPECTROSCOPY 2024:37028241268158. [PMID: 39094004 DOI: 10.1177/00037028241268158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
The aim of this work was the development and morphological/chemical, spectroscopic, and structural characterization of titanium dioxide, niobium pentoxide, and titanium:niobium (Ti:Nb) oxides, as well as materials modified with ruthenium (Ru) with the purpose of providing improvement in photoactivation capacity with visible sunlight radiation. The new materials synthesized using the sol-gel methodology were characterized using the following techniques: scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), photoacoustic spectroscopy (PAS), and X-ray diffraction (XRD). The SEM-EDS analyses showed the high purity of the bases, and the modified samples showed the adsorption of ruthenium on the surface with the crystals' formation and visible agglomerates for higher calcination temperature. The nondestructive characterization of PAS in the ultraviolet visible region suggested that increasing calcination temperature promoted changes in chemical structures and an apparent decrease in gap energy. The separation of superimposed absorption bands referring to charge transfers from the ligand to the metal and the nanodomains of the transition metals suggested the possible absorption centers present at the absorption threshold of the analyzed oxides. Through the XRD analysis, the formation of stable phases such as T-Nb16.8O42, o-Nb12O29, and rutile was observed at a lower temperature level, suggesting pore induction and an increase in surface area for the oxides studied, at a calcination temperature below that expected by the related literature. In addition, the synthesis with a higher temperature level altered the previously existing morphologies of the Ti:Nb, base and modified with Ru, forming the new mixed crystallographic phases Ti2Nb10O29 and TiNb2O7, respectively. As several semiconductor oxide applications aim to reduce costs with photoexcitation under visible light, the modified Ti:Ru oxide calcined at a temperature of 800 °C and synthesized according to the sol-gel methodology used in this work is suggested as the optimum preparation point. This study presented the formation of a stable crystallographic phase (rutile), a significant decrease in gap energy (2.01 eV), and a visible absorption threshold (620 nm).
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Affiliation(s)
- Daniele T Dias
- Centro de Caracterização Multiusuário em Pesquisa e Desenvolvimento de Materiais, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
| | - Andressa O Rodrigues
- Programa de Pós-Graduação em Engenharia Química, Departamento Acadêmico de Engenharia Química, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
| | - Pietra B Pires
- Programa de Pós-Graduação em Engenharia Química, Departamento Acadêmico de Engenharia Química, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
| | - Betina C Semianko
- Programa de Pós-Graduação em Engenharia Química, Departamento Acadêmico de Engenharia Química, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
| | - Maria E K Fuziki
- Programa de Pós-Graduação em Engenharia Química, Universidade Estadual de Maringá, Maringá, Brazil
| | - Giane G Lenzi
- Centro de Caracterização Multiusuário em Pesquisa e Desenvolvimento de Materiais, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
- Programa de Pós-Graduação em Engenharia Química, Departamento Acadêmico de Engenharia Química, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
| | - Simone R F Sabino
- Centro de Caracterização Multiusuário em Pesquisa e Desenvolvimento de Materiais, Universidade Tecnológica Federal do Paraná, Ponta Grossa, Brazil
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Tsai YH, Milbrandt NB, Prado RC, Ponce NB, Alam MM, Qiu SR, Yu X, Burda C, Kim TKJ, Samia ACS. Effect of Nitrogen Doping on the Photocatalytic Properties and Antibiofilm Efficacy of Reduced TiO 2 Nanoparticles. ACS APPLIED BIO MATERIALS 2024; 7:4580-4592. [PMID: 38958462 DOI: 10.1021/acsabm.4c00459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Nanomaterial-mediated antibacterial photodynamic therapy (aPDT) emerges as a promising treatment against antibiotic-resistant bacterial biofilms. Specifically, titanium dioxide nanoparticles (TiO2 NPs) are being investigated as photosensitizers in aPDT to address biofilm related diseases. To enhance their photocatalytic performance in the visible spectral range for biomedical applications, various strategies have been adopted, including reduction of TiO2 NPs. However, despite improvements in visible-light photoactivity, reduced TiO2 NPs have yet to reach their expected performance primarily due to the instability of oxygen vacancies and their tendency to reoxidize easily. To address this, we present a two-step approach to fabricate highly visible-light active and stable TiO2 NP photocatalysts, involving nitrogen doping followed by a magnesium-assisted reductive annealing process. X-ray photoelectron spectroscopy analysis of the synthesized reduced nitrogen-doped TiO2 NPs (H:Mg-N-TiO2 NPs) reveals that the presence of nitrogen stabilizes oxygen vacancies and reduced Ti species, leading to increased production of reactive oxygen species under visible-light excitation. The improved aPDT efficiency translates to a 3-fold enhancement in the antibiofilm activity of nitrogen-doped compared to undoped reduced TiO2 NPs against both Gram-positive (Streptococcus mutans) and Gram-negative (Porphyromonas gingivalis, Fusobacterium nucleatum) oral pathogens. These results underscore the potential of H:Mg-N-TiO2 NPs in aPDT for combating bacterial biofilms effectively.
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Affiliation(s)
- Yu Hsin Tsai
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Nathalie B Milbrandt
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Ross Clark Prado
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Nicole Beatrice Ponce
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Md Masud Alam
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - S Roger Qiu
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratyory, Livermore, California 94551, United States
| | - Xiong Yu
- Department of Civil and Environmental Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Clemens Burda
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Tae Kyong John Kim
- Swagelok Center for Surface Analysis of Materials, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Anna Cristina S Samia
- Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
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Devi S, Kumari S, Sharma A, Dhiman M, Thakur M, Kumar A. Boosting the photocatalytic activity of g-C 3N 4 via loading bio-synthesized Ag 0 nanoparticles and imidazole modification for the degradation and mineralization of fluconazole. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:15851-15871. [PMID: 38305976 DOI: 10.1007/s11356-024-31834-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 12/29/2023] [Indexed: 02/03/2024]
Abstract
The emergence of fluorinated organic compounds in the pharmaceutical, agrochemical, and textile industries has led to a potential increase in the environmental issues and health problems. Herein, a modified heterojunction of bio-synthesized Ag nanoparticles (Ag0 NPs) immobilized on imidazole-modified graphite carbon nitride (Im/g-C3N4) as a suitable support (Ag0/Im/g-C3N4) was hydrothermally synthesized and studied for the photocatalytic removal of the most widely used antifungal organo-fluorine compound-fluconazole (FCZ). The optical properties were thoroughly investigated in the present study, and it was observed that the proposed modification to g-C3N4 has led to the shifting of conduction and valance band edge position (for g-C3N4, -0.73 and 1.54 eV and for ICA, -1.14 and 1.28 eV), narrowing of band gap energies, i.e., 2.01 eV, and reduced charge recombination rate. The external and internal surface morphologies were scrutinized through FE-SEM and HR-TEM analyses. Functionalities and potential crystallinity were investigated using FTIR and XRD techniques. The elemental state and composition of the composite were analyzed via XPS. The obtained results substantiate the intended modifications in the ICA composite. The photocatalyst Ag0/Im/g-C3N4 (ICA) was able to degrade 95.74% of FCZ with a high degradation rate (k1) of 0.0289 min-1 within 2-h of the solar illumination experiment. The overall degradation process was observed to be governed by a pseudo-first-order kinetic model. Detailed parameters such as effects of ions, pH (optimized pH 4, highest degradation rate k1 =0.039 min-1), dissolved organic matter (DOM), and optimization of catalysts dosage were studied. The major reactive oxygen species (ROS) was identified as super-oxide radicals (O2●-). The HR-MS and COD-TOC analysis were used to evaluate the degradation and mineralization of FCZ forced by ICA catalysts. The ICA catalyst was found to be stable and reusable for up to five cycles suggesting towards its potential towards the mitigation of environmental pollutants.
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Affiliation(s)
- Sushma Devi
- Department of Chemistry, School of Basic and Applied Sciences, Maharaja Agrasen University, Atal Shiksha Kunj, Solan (HP), 174103, India
| | - Suman Kumari
- Department of Chemistry, School of Basic and Applied Sciences, Maharaja Agrasen University, Atal Shiksha Kunj, Solan (HP), 174103, India
| | - Arush Sharma
- School of Sciences, Baddi University of Emerging Sciences and Technology, (BUEST) Solan, Himachal Pradesh, 173205, India
| | - Manisha Dhiman
- Department of Chemistry, School of Basic and Applied Sciences, Maharaja Agrasen University, Atal Shiksha Kunj, Solan (HP), 174103, India
- Centre of Excellence in Nanotechnology, Maharaja Agrasen University, Atal Shiksha Kunj, Solan (HP), 174103, India
| | - Manita Thakur
- Department of Chemistry, IEC University, Baddi, Solan, Himachal Pradesh, 174103, India
| | - Ajay Kumar
- Department of Chemistry, School of Basic and Applied Sciences, Maharaja Agrasen University, Atal Shiksha Kunj, Solan (HP), 174103, India.
- Centre of Excellence in Nanotechnology, Maharaja Agrasen University, Atal Shiksha Kunj, Solan (HP), 174103, India.
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Tian C, Yu H, Zhai R, Zhang J, Gao C, Qi K, Zhang Y, Ma Q, Guo M. Visible Light Photoactivity of g-C 3N 4/MoS 2 Nanocomposites for Water Remediation of Hexavalent Chromium. Molecules 2024; 29:637. [PMID: 38338381 PMCID: PMC10856395 DOI: 10.3390/molecules29030637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 01/21/2024] [Accepted: 01/26/2024] [Indexed: 02/12/2024] Open
Abstract
Water pollution has becoming an increasingly serious issue, and it has attracted a significant amount of attention from scholars. Here, in order remove heavy metal hexavalent chromium (Cr (VI)) from wastewater, graphitic carbon nitride (g-C3N4) was modified with molybdenum disulfide (MoS2) at different mass ratios via an ultrasonic method to synthesize g-C3N4/MoS2 (CNM) nanocomposites as photocatalysts. The nanocomposites displayed efficient photocatalytic removal of toxic hexavalent chromium (Cr (VI)) from water under UV, solar, and visible light irradiation. The CNM composite with a 1:2 g-C3N4 to MoS2 ratio achieved optimal 91% Cr (VI) removal efficiency at an initial 20 mg/L Cr (VI) concentration and pH 3 after 120 min visible light irradiation. The results showed a high pH range and good recycling stability. The g-C3N4/MoS2 nanocomposites exhibited higher performance compared to pure g-C3N4 due to the narrowed band gap of the Z-scheme heterojunction structure and effective separation of photo-generated electron-hole pairs, as evidenced by structural and optical characterization. Overall, the ultrasonic synthesis of g-C3N4/MoS2 photocatalysts shows promise as an efficient technique for enhancing heavy metal wastewater remediation under solar and visible light.
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Affiliation(s)
- Chunmei Tian
- College of Agriculture and Biological Science, Dali University, Dali 671000, China; (C.T.); (H.Y.); (R.Z.); (J.Z.); (C.G.)
| | - Huijuan Yu
- College of Agriculture and Biological Science, Dali University, Dali 671000, China; (C.T.); (H.Y.); (R.Z.); (J.Z.); (C.G.)
| | - Ruiqi Zhai
- College of Agriculture and Biological Science, Dali University, Dali 671000, China; (C.T.); (H.Y.); (R.Z.); (J.Z.); (C.G.)
| | - Jing Zhang
- College of Agriculture and Biological Science, Dali University, Dali 671000, China; (C.T.); (H.Y.); (R.Z.); (J.Z.); (C.G.)
| | - Cuiping Gao
- College of Agriculture and Biological Science, Dali University, Dali 671000, China; (C.T.); (H.Y.); (R.Z.); (J.Z.); (C.G.)
| | - Kezhen Qi
- College of Pharmacy, Dali University, Dali 671000, China;
| | - Yingjie Zhang
- College of Agriculture and Biological Science, Dali University, Dali 671000, China; (C.T.); (H.Y.); (R.Z.); (J.Z.); (C.G.)
- Key Laboratory of Ecological Microbial Remediation Technology of Yunnan Higher Education Institutes, Dali University, Dali 671000, China
| | - Qiang Ma
- School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China
| | - Mengxue Guo
- Resources and Environment Institute, Yunnan Land and Resources Vocational College, Kunming 652501, China;
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Xue J, Wang P, Cheng W, Shi L, Bi Q. Preparation and performance of aerogel-based BiOI/TiO 2 heterojunction photoelectrocatalytic electrodes. Phys Chem Chem Phys 2023; 25:23761-23769. [PMID: 37615572 DOI: 10.1039/d3cp01213a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Abstract
TiO2/BiOI/CA electrodes with improved conductivity, reduced photoelectron-hole recombination rates, and increased reaction sites based on p-n type heterojunctions were constructed on carbon aerogels (CA) as photoelectrode substrates. Characterization based on ultraviolet-visible diffuse reflectance spectroscopy, photocurrent measurements, and impedance analysis showed that the TiO2/BiOI/CA photoelectrode with a Ti/Bi mole ratio of 0.4 exhibited the best visible light absorption, lowest photogenerated electron-hole pair recombination rate, and strongest photocatalytic degradation, with 90.4% degradation of phenol under 120 min of light. Moreover, the stability of this electrode remained at a high level. This was mainly because the energy levels of TiO2 and BiOI matched each other and the p-n heterojunction formed adjusted the energy band structure of the composite material, widened the electron transfer path, formed an internal electric field between the phase interfaces, had a higher electron transfer rate, and reduced the photogenerated electron-hole recombination rate. Since ˙OH and ˙O2- are the main active substances in the degradation of phenol, the TiO2/BiOI/CA photoelectrodes had higher degradation efficiency than BiOI/CA electrodes. This study provides a unique concept for the treatment of organic pollutant wastewater and electrode design for photoelectrocatalysis.
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Affiliation(s)
- Juanqin Xue
- School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Peng Wang
- School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Wen Cheng
- School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Long Shi
- School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| | - Qiang Bi
- School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
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Singh S, Yadav RK, Pande P, Kim TW, Singh AP, Singh C, Baeg JO. Photocatalytic turnover number & turnover frequency of 4-HNB under solar light by ‘1’ photocatalyst with & without reducer. MAIN GROUP CHEMISTRY 2023. [DOI: 10.3233/mgc-220138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
4-hydroxynitrobenzene (4-HNB) is a highly effective industrial pollutant that causes adverse effects to human beings. In this regard, detoxification of noxious water is utmost indispensable. Highly efficient metal-free photocatalytic degradation and reduction of 4-HNB with and without reducing agent still challenge. Additionally, for this role, largely expensive reagents that can create inauspicious impacts on the environment are utilized. Herein, we developed a ‘1’ photocatalyst that has the excellent ability for the H2O2-mediated degradation and reductant-free reduction of 4-HNB. The ‘1’ photocatalyst has an excellent turnover number (TON) 0.644×1020 molecules and turnover frequency (TOF) 0.0035×1020 molecules /min.
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Affiliation(s)
- Satyam Singh
- Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P., India
| | - Rajesh K. Yadav
- Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P., India
| | - P.P. Pande
- Department of Chemistry and Environmental Science, Madan Mohan Malaviya University of Technology, Gorakhpur, U.P., India
| | - Tae Wu Kim
- Department of Chemistry, Mokpo National University, Muan-gun, Jeollanam-do, Republic of Korea
| | - Atul P. Singh
- Department of Chemistry, Chandigarh University, Mohali, Punjab, India
| | - Chandani Singh
- Korea Research Institute of Chemical Technology, Yuseong-gu, Daejeon, South Korea
| | - Jin-Ook Baeg
- Korea Research Institute of Chemical Technology, Yuseong-gu, Daejeon, South Korea
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Nayebi M, Faraji A, Bahadoran A, Othman ZJ, Arghavani S, Kargar PG, Sajjadinezhad SM, Varma RS. TiO 2/g-C 3N 4/SO 3H(IL): Unique Usage of Ionic Liquid-Based Sulfonic Acid as an Efficient Photocatalyst for Visible-Light-Driven Preparation of 5-HMF from Cellulose and Glucose. ACS APPLIED MATERIALS & INTERFACES 2023; 15:8054-8065. [PMID: 36719302 DOI: 10.1021/acsami.2c20480] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Upgrading of biomass wastes to value-added materials has been incessantly pursued worldwide with diverse applications, especially deploying photocatalytic composites encompassing metal oxides with acidic and carbon compounds. Herein, the fabrication of a morphologically unique acidic catalyst encompassing a two-dimensional (2D) TiO2/g-C3N4 heterojunction feature is described for the generation of 5-hydroxymethylfurfural (5-HMF), which exploits the acidic/ionic liquid (IL) bifunctional photocatalysis under visible light. The structural integrity of the synthesized TiO2/g-C3N4/SO3H(IL) was corroborated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy-energy-dispersive spectroscopy (EDX-EDS), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), UV-vis, Tauc plots, transmission electron microscopy (TEM), and Brunauer-Emmett-Teller-Barrett-Joyner-Halenda (BET-BJH) analyses. Keeping environmental impact in mind, there are compelling advantages in the development of bio-derived pathways to access ILs from natural renewable resources. The outcomes of environmental assessments have revealed that the incorporation of TiO2 in g-C3N4 and ClSO3H can reduce the probability of recombination due to ionic charges present, therefore enhancing the photocatalytic activity via the transformation of cellulose and glucose to produce 5-HMF in higher yields, with the optimum conditions being reaction in water under a blue light-emitting diode (LED), at 100 °C, for 1-1.5 h. The main advantages of this production method include minimum number of synthetic steps as well as ample availability of and easy access to primary ingredients. While a significant volume of 5-HMF was produced under blue light-emitting diode (LED) radiation, the selectivity was drastically reduced in the dark. The salient attributes of the catalyst comprise stability in air, robustness, reusability, and its overall superior activity that is devoid of hazardous additives or agents. This inimitable method has uncovered a newer strategy for enhancing the photocatalytic attributes of deployed semiconducting materials for numerous photocatalytic functions while adhering to the tenets of environmental friendliness.
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Affiliation(s)
- Milad Nayebi
- Chemical Engineering Department, Amirkabir University of Technology, Tehran15875-4413, Iran
| | - Amir Faraji
- Construction Project Management Department, Faculty of Architecture, Khatam University, Tehran1991633357, Iran
- Visiting Fellow, Western Sydney University, Sydney2751, Australia
| | - Ashkan Bahadoran
- State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai200240, China
| | - Zhian Jamal Othman
- Department of Physical Education and Sport Sciences, Cihan University-Erbil, Erbil44001, Iraq
| | - Soheila Arghavani
- Department of Chemistry, Faculty of Sciences, University of Birjand, Birjand97175-615, Iran
| | - Pouya Ghamari Kargar
- Department of Chemistry, Faculty of Sciences, University of Birjand, Birjand97175-615, Iran
| | - Seyed Mehrzad Sajjadinezhad
- Polymer Chemistry Research Laboratory, Faculty of Chemistry, Shahid Beheshti University, Tehran19839-63113, Iran
| | - Rajender S Varma
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University in Olomouc, ̌Slechtitelů 27, Olomouc783 71, Czech Republic
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Lei Y, Si W, Wang Y, Tan H, Di L, Wang L, Liang J, Hou F. Robust Carbon Nitride Homojunction Photoelectrode for Solar-Driven Water Splitting. ACS APPLIED MATERIALS & INTERFACES 2023; 15:6726-6734. [PMID: 36692988 DOI: 10.1021/acsami.2c18694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Achieving intimate particle-to-particle and particle-to-substrate contacts is the first priority for fabricating high-quality photoelectrodes to ensure sufficient visible light absorption and efficient charge separation/transport. To achieve this goal, a seeding strategy is designed to construct a robust carbon nitride (CN) homojunction photoelectrode, in which vaporized precursors are condensed into a compact seeding layer at low temperatures, inducing the further deposition of the top layer. This optimized photoelectrode displays an excellent photocurrent density of 320 μA cm-2 in 0.1 M NaOH electrolyte at 1.23 VRHE (V vs reversible hydrogen electrode) under AM 1.5G illumination, with H2 and O2 evolution rates of 2.98 and 1.47 μmol h-1 cm-2, respectively. Characterizations show that both the robust contact and the homojunction of the double-layered CN film contribute to enhanced photoelectrochemical performance. This work may provide a new strategy for the design of high-performing CN photoelectrodes.
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Affiliation(s)
- Yanyan Lei
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin300350, China
| | - Wenping Si
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin300350, China
| | - Yuqing Wang
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin300350, China
| | - Haotian Tan
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin300350, China
| | - Lu Di
- School of Materials Science and Engineering, Nankai University, Tianjin300350, China
| | - Liqun Wang
- Applied Physics Department, College of Physics and Materials Science, Tianjin Normal University, Tianjin300387, China
| | - Ji Liang
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin300350, China
| | - Feng Hou
- Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin300350, China
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Fan G, Zhou J, Ruan F, Li Y, Tian H, Fan D, Chen Q, Li N. The Z-scheme photocatalyst S-BiOBr/Bi2Sn2O7 with 3D/0D interfacial structure for the efficient degradation of organic pollutants. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Song Z, Wang C, Shu S, Liu J, Liu J, Li Y, Huang L, Huang L. Facile synthesis CQDs/SnO 2-x/BiOI heterojunction photocatalyst to effectively degrade pollutants and antibacterial under LED light. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2022; 236:112566. [PMID: 36155859 DOI: 10.1016/j.jphotobiol.2022.112566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 08/30/2022] [Accepted: 09/06/2022] [Indexed: 06/16/2023]
Abstract
To remove multitudinous pollutants from wastewater, the design of a highly efficient and multifunctional photocatalyst is necessary. A novel CQDs/SnO2-x/BiOI photocatalyst (named CSnBI composite) was prepared by combining carbon quantum dots (CQDs), large specific surface area SnO2-x nanocrystals and BiOI nanocrystals to obtain a compact hybrid structure. TEM and Raman techniques confirmed the structure of CSnBI composite. The photocurrent and EIS showed that the photoexcited electron-hole pairs separation efficiency was improved. As anticipated, novel CSnBI photocatalyst can successfully remove tetracycline, methyl orange, E. coli (Escherichia coli) and S. aureus under a LED light due to the hybridization contaction among CQDs, SnO2-x and BiOI. The mechanism showed that the introduction of CQDs promoted visible light absorption and efficient separation of photogenerated carriers of SnO2-x/BiOI heterojunction. The capture experiment and related measurements showed that h+, •O2- and •OH are active species in the photocatalytic process. This study gave a novel case for facile construction of photocatalysts with tight hybrid structure.
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Affiliation(s)
- Zhuwei Song
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Chaobao Wang
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Shuangxiu Shu
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Jiawei Liu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Juan Liu
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China
| | - Yeping Li
- School of Pharmacy, Jiangsu University, Zhenjiang 212013, PR China.
| | - Liying Huang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Lijing Huang
- Institute of Micro-Nano Optoelectronic and Terahertz Technology, Jiangsu University, Zhenjiang 212013, PR China.
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12
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A compact Z-scheme heterojunction of BiOCl/Bi2WO6 for efficiently photocatalytic degradation of gaseous toluene. J Colloid Interface Sci 2022; 631:44-54. [DOI: 10.1016/j.jcis.2022.11.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/26/2022] [Accepted: 11/06/2022] [Indexed: 11/10/2022]
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13
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Wolde GS, Kuo DH, Abdullah H. Solar-light-driven ternary MgO/TiO 2/g-C 3N 4 heterojunction photocatalyst with surface defects for dinitrobenzene pollutant reduction. CHEMOSPHERE 2022; 307:135939. [PMID: 35940421 DOI: 10.1016/j.chemosphere.2022.135939] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 07/26/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Defect engineering and heterojunction are promising strategies to improve the photocatalytic performance of particular catalyst through effective charge carrier separation and transport. Herein, we developed Z-scheme MgO/TiO2/g-C3N4 ternary heterojunction photocatalyst with surface defects and effective charge separation for reduction of recalcitrant dinitrobenzene isomers under simulated solar light irradiation. Mott-Schottky (MS) plot analysis and electron spin resonance (ESR) radical trapping experiment suggested the formation of Z-scheme heterojunction at the interface of TiO2/g-C3N4, which played a crucial role in the electron-hole separation. Incorporating MgO into the structure further enhances charge separation via Ti3+ and oxygen vacancy (OV) defects formation at the TiO2/MgO interface as confirmed by electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) analyses. Besides, the surface basicity of MgO enhanced conversion of dinitrobenzene (DNB) isomers through formation of nitrophenylhydroxylamine intermediate which can easily be reduced to phenylenediamines (PDAs). As confirmed by high performance liquid chromatography (HPLC) analysis, excellent selectivity for PDAs (95-98%) was achieved in 90 min with ternary MgO/TiO2/g-C3N4 composite compared to the binary MgO/TiO2 and TiO2/g-C3N4. A possible reaction pathway and photocatalytic reduction mechanism were proposed and elucidated. This work demonstrated an effective strategy to reduce recalcitrant dinitrobenzene isomers using efficient, low-cost, and environmental benign photocatalyst with a facile identification of reaction intermediates.
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Affiliation(s)
- Girma Sisay Wolde
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan
| | - Dong-Hau Kuo
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan.
| | - Hairus Abdullah
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan
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14
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Wang S, Hu X, Yu F, Qin S. Microbe Regulates the Mineral Photochemical Activity and Organic Matter Compositions in Water. WATER RESEARCH 2022; 225:119164. [PMID: 36179428 DOI: 10.1016/j.watres.2022.119164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 09/04/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Photochemical reactions that widely occur in aquatic environments play important roles in carbon fate (e.g., carbon conversion and storage from organic matter) in ecosystems. Aquatic microbes and natural minerals further regulate carbon fate, but the processes and mechanisms remain largely unknown. Herein, the interaction between Escherichia coli and pyrite and its influence on the fate of carbon in water were investigated at the microscopic scale and molecular level. The results showed that saccharides and phenolic compounds in microbial extracellular polymeric substances helped remove pyrite surface oxides via electron transfer. After the removal of surface oxides on pyrite, the photochemical properties under visible-light irradiation were significantly decreased, such as reactive oxygen species and electron transfer capacity. Unlike the well-accepted theory of minerals protecting organic matter in the soil, the organic matter adsorbed on minerals preferred degradation due to the enhanced photochemical reactions in water. In contrast, the minerals transformed by microbes suppressed the decomposition of organic matter due to the passivation of the chemical structure and activity. These results highlight the significance of mineral chemical activity on organic matter regulated by microbes and provide insights into organic matter conversion in water.
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Affiliation(s)
- Shuting Wang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 30080, Tianjin, China
| | - Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 30080, Tianjin, China.
| | - Fubo Yu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 30080, Tianjin, China
| | - Songyan Qin
- School of Environmental Science and Safety Engineering, Tianjin University of Technology, 300384, Tianjin, China
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15
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Graphite foam as carbon-based footprint for in-situ fabrication of Ti3+-doped titanium niobium oxide (Ti2Nb10O29) nanocrystal for high-rate performance lithium-ion batteries. J Colloid Interface Sci 2022. [DOI: 10.1016/j.jcis.2022.05.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Kodithuwakku P, Jayasundara D, Munaweera I, Jayasinghe R, Thoradeniya T, Weerasekera M, Ajayan PM, Kottegoda N. A Review on Recent Developments in Structural Modification of TiO2 For Food Packaging Applications. PROG SOLID STATE CH 2022. [DOI: 10.1016/j.progsolidstchem.2022.100369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Exploiting the potential of silver oxo-salts with graphitic carbon nitride/fibrous silica-titania in designing a new dual Z-scheme photocatalyst for photodegradation of 2-chlorophenol. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120984] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Acharya R, Pati S, Parida K. A review on visible light driven spinel ferrite-g-C3N4 photocatalytic systems with enhanced solar light utilization. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119105] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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19
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Zhang S, Dai M, Guo J, Wang G, Wang S, He Z. Stable Ti3+ in B-TiO2/BN Based Hybrids for Efficient Photocatalytic Reduction. CHEMICAL ENGINEERING JOURNAL ADVANCES 2022. [DOI: 10.1016/j.ceja.2022.100333] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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20
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Construction of Z-scheme heterojunction by coupling Bi 2Sn 2O 7 and BiOBr with abundant oxygen vacancies: Enhanced photodegradation performance and mechanism insight. J Colloid Interface Sci 2022; 612:550-561. [PMID: 35016018 DOI: 10.1016/j.jcis.2021.12.152] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 12/12/2021] [Accepted: 12/22/2021] [Indexed: 01/31/2023]
Abstract
Promoting charge migration and enhancing redox ability of photogenerated carriers are important for the development of highly efficient semiconductor-based photocatalyst. Here, BiOBr/Bi2Sn2O7 heterojunction with oxygen vacancies (OVs) was constructed by homogeneously depositing Bi2Sn2O7 nanoparticles on the Vo-BiOBr surface. The experimental results manifested that Vo-BiOBr/Bi2Sn2O7 displayed better performance for rhodamine B, ciprofloxacin, and tetracycline degradation than counterparts without OVs. The characterization results proved OVs played the essential role for enhanced performance via improving the separation efficiency of charge carriers, increasing the visible light harvest, and lowering conduction band position. Moreover, mechanism study revealed that an inner electric field was built at the interface, leading to a Z-scheme path of photogenerated electron. This study provided an efficient strategy for designing highly efficient photocatalyst for solving environmental pollution.
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21
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Mofokeng LE, Hlekelele L, Tetana ZN, Moma J, Chauke VP. CuO‐doped TiO
2
Supported on Graphitic Carbon Nitride for the Photodegradation of Ketoprofen in Drinking and Groundwater: Process Optimization and Energy Consumption evaluation. ChemistrySelect 2022. [DOI: 10.1002/slct.202101847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lethula E. Mofokeng
- Centre for Nanostructures and Advanced Materials Council for Scientific and Industrial Research Meiring Naude Rd, Brummeria Pretoria 0184 South Africa
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3 2050 Johannesburg South Africa
| | - Lerato Hlekelele
- Centre for Nanostructures and Advanced Materials Council for Scientific and Industrial Research Meiring Naude Rd, Brummeria Pretoria 0184 South Africa
| | - Zikhona N. Tetana
- DSI/NRF Centre of Excellence in Strong Materials University of the Witwatersrand Private Bag 3 2050 Johannesburg South Africa
- Microscopy and Microanalysis Unit University of the Witwatersrand Private Bag 3 2050 Johannesburg South Africa
| | - John Moma
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3 2050 Johannesburg South Africa
| | - Vongani P. Chauke
- Centre for Nanostructures and Advanced Materials Council for Scientific and Industrial Research Meiring Naude Rd, Brummeria Pretoria 0184 South Africa
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22
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Chen W, Liu S, Fu Y, Yan H, Qin L, Lai C, Zhang C, Ye H, Chen W, Qin F, Xu F, Huo X, Qin H. Recent advances in photoelectrocatalysis for environmental applications: Sensing, pollutants removal and microbial inactivation. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214341] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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23
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Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites. Catalysts 2022. [DOI: 10.3390/catal12020120] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In this work, g-C3N4/TiO2 composites were fabricated through a hydrothermal method for the efficient photocatalytic degradation of imidacloprid (IMI) pesticide. The composites were fabricated at varying loading of sonochemically exfoliated g-C3N4 (denoted as CNS). Complementary characterization results indicate that the heterojunction between the CNS and TiO2 formed. Among the composites, the 0.5CNS/TiO2 material gave the highest photocatalytic activity (93% IMI removal efficiency) under UV-Vis light irradiation, which was 2.2 times over the pristine g-C3N4. The high photocatalytic activity of the g-C3N4/TiO2 composites could be ascribed to the band gap energy reduction and suppression of photo-induced charge carrier recombination on both TiO2 and CNS surfaces. In addition, it was found that the active species involved in the photodegradation process are OH• and holes, and a possible mechanism was proposed. The g-C3N4/TiO2 photocatalysts exhibited stable photocatalytic performance after regeneration, which shows that g-C3N4/TiO2 is a promising material for the photodegradation of imidacloprid pesticide in wastewater.
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Alaghmandfard A, Ghandi K. A Comprehensive Review of Graphitic Carbon Nitride (g-C 3N 4)-Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:294. [PMID: 35055311 PMCID: PMC8779993 DOI: 10.3390/nano12020294] [Citation(s) in RCA: 58] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 12/27/2021] [Accepted: 01/05/2022] [Indexed: 02/06/2023]
Abstract
g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4-metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4-metal-oxide-based heterojunctions.
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Affiliation(s)
| | - Khashayar Ghandi
- Department of Chemistry, University of Guelph, Guelph, ON N1G 2W1, Canada;
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25
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Yu X, Ng SF, Putri LK, Tan LL, Mohamed AR, Ong WJ. Point-Defect Engineering: Leveraging Imperfections in Graphitic Carbon Nitride (g-C 3 N 4 ) Photocatalysts toward Artificial Photosynthesis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2006851. [PMID: 33909946 DOI: 10.1002/smll.202006851] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 02/10/2021] [Indexed: 06/12/2023]
Abstract
Graphitic carbon nitride (g-C3 N4 ) is a kind of ideal metal-free photocatalysts for artificial photosynthesis. At present, pristine g-C3 N4 suffers from small specific surface area, poor light absorption at longer wavelengths, low charge migration rate, and a high recombination rate of photogenerated electron-hole pairs, which significantly limit its performance. Among a myriad of modification strategies, point-defect engineering, namely tunable vacancies and dopant introduction, is capable of harnessing the superb structural, textural, optical, and electronic properties of g-C3 N4 to acquire an ameliorated photocatalytic activity. In view of the burgeoning development in this pacey field, a timely review on the state-of-the-art advancement of point-defect engineering of g-C3 N4 is of vital significance to advance the solar energy conversion. Particularly, insights into the intriguing roles of point defects, the synthesis, characterizations, and the systematic control of point defects, as well as the versatile application of defective g-C3 N4 -based nanomaterials toward photocatalytic water splitting, carbon dioxide reduction and nitrogen fixation will be presented in detail. Lastly, this review will conclude with a balanced perspective on the technical and scientific hindrances and future prospects. Overall, it is envisioned that this review will open a new frontier to uncover novel functionalities of defective g-C3 N4 -based nanostructures in energy catalysis.
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Affiliation(s)
- Xinnan Yu
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor, Darul Ehsan, 43900, Malaysia
| | - Sue-Faye Ng
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor, Darul Ehsan, 43900, Malaysia
- Center of Excellence for NaNo Energy & Catalysis Technology (CONNECT), Xiamen University Malaysia, Selangor, Darul Ehsan, 43900, Malaysia
| | - Lutfi Kurnianditia Putri
- Low Carbon Economy (LCE) Research Group, School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, Pulau, Pinang, 14300, Malaysia
| | - Lling-Lling Tan
- Multidisciplinary Platform of Advanced Engineering, Chemical Engineering Discipline, School of Engineering, Monash University, Selangor, Darul Ehsan, 47500, Malaysia
| | - Abdul Rahman Mohamed
- Low Carbon Economy (LCE) Research Group, School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal, Pulau, Pinang, 14300, Malaysia
| | - Wee-Jun Ong
- School of Energy and Chemical Engineering, Xiamen University Malaysia, Selangor, Darul Ehsan, 43900, Malaysia
- Center of Excellence for NaNo Energy & Catalysis Technology (CONNECT), Xiamen University Malaysia, Selangor, Darul Ehsan, 43900, Malaysia
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
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One-step synthesis of melamine-sponge functionalized carbon nitride for excellent water sterilization via photogenerated holes and photothermal conversion. J Colloid Interface Sci 2021; 610:893-904. [PMID: 34863557 DOI: 10.1016/j.jcis.2021.11.126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 10/26/2021] [Accepted: 11/21/2021] [Indexed: 11/23/2022]
Abstract
In recent years, graphitic carbon nitride (g-C3N4) has been developed greatly in the domain of water treatment. We adopted one-step calcination to enhance the light absorption of g-C3N4 with melamine-sponge (MS). A novel form of photocatalysts (gCNMx, x = 0.1, 0.2 and 0.3) were successfully prepared. The color of gCNMx changed with addition of MS. Experimental analysis demonstrated that C-doping and N vacancies increased the capacity of light absorption of gCNM0.2, and further increased efficiency of photothermal conversion and photogenerated holes. The sterilization efficiency of gCNM0.2 could rival a variety of metal photocatalysts. Moreover, the preparation of gCNM0.2 was cost-effective and environmental-friendly. Interestingly, the inactivation efficacy of gCNM0.2 for S. aureus depended heavily on the photogenerated holes, however, the decisive force toward S. typhimurium was photothermal conversion.
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Recent Trends in Graphitic Carbon Nitride-Based Binary and Ternary Heterostructured Electrodes for Photoelectrochemical Water Splitting. Processes (Basel) 2021. [DOI: 10.3390/pr9111959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The graphitic carbon nitride (g-C3N4) is a class of two-dimensional layered material. The ever-growing research on this fascinating material is due to its unique visible light absorption, surface, electrocatalytic, and other physicochemical properties that can be useful to different energy conversion and storage applications. Photoelectrochemical (PEC) water splitting reaction is one of the promising applications of g-C3N4, wherein it acts as a durable catalyst support material. Very recently, the construction of g-C3N4-based binary and ternary heterostructures exhibited superior PEC water splitting performance owing to its reduced reunion of e-/h+ pairs and the fast transfer of charge carriers at the heterostructure interface. This review compiles the recent advances and challenges on g-C3N4-based heterostructured photocatalysts for the PEC water splitting reaction. After an overview of the available literature, we presume that g-C3N4-based photocatalysts showed enhanced PEC water splitting performance. Therefore, it is believed that these materials have tremendous opportunities to act as durable catalyst support for energy-related applications. However, researchers also considered several limitations and challenges for using C3N4 as an efficient catalyst support material that must be addressed. This review article provides an overview of the fundamental principles of PEC water splitting, the current PEC water splitting research trends on g-C3N4-based binary and ternary heterostructured electrodes with respect to different electrolytes, and the other key factors influencing their photoelectrochemical performance. Finally, the future research direction with several recommendations to improve the photocatalytic efficiency of these materials is also provided at the end.
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Designing Ag2O modified g-C3N4/TiO2 ternary nanocomposites for photocatalytic organic pollutants degradation performance under visible light: Synergistic mechanism insight. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127472] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Constructing electrostatic self-assembled ultrathin porous red 2D g-C 3N 4/Fe 2N Schottky catalyst for high-efficiency tetracycline removal in photo-Fenton-like processes. J Colloid Interface Sci 2021; 607:1527-1539. [PMID: 34583049 DOI: 10.1016/j.jcis.2021.09.112] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 09/14/2021] [Accepted: 09/19/2021] [Indexed: 01/28/2023]
Abstract
The traditional heterogeneous photo-Fenton reaction was mainly restricted by the fewer surface-active sites, low Fe3+/Fe2+ transformation and H2O2 activation efficiency of catalyst. This work designed and fabricated the efficient photo-Fenton Schottky catalysts via a facile electrostatic self-assembly of metallic Fe2N nanoparticles scattering on the surface of red g-C3N4 (ultrathin porous oxygen-doped 2D g-C3N4 nanosheets). The porous morphology and exceptional electrical structure of red g-C3N4 endowed more active sites and facilitated the photoexcited charge separation. Benefitting from the Schottky effect and unique dimensional coupling structure, the strong visible light absorption and fast spatial charge transfer were realized in the Schottky junction system. More strikingly, Fe2N as an efficient co-catalyst was in favor of the trap and export of e-, leading to the Fe3+/Fe2+ transformation and H2O2 activation during the photo-Fenton process. Accordingly, the as-prepared catalysts revealed outstanding activity in photo-Fenton like degradation of tetracycline (TC) although under 5 W white LED light irradiation. Furthermore, the reasonable degradation pathway of TC and corresponding toxicity of the intermediates, as well as the photo-Fenton catalytic mechanism were interpreted and discussed in detail. This study would be a great aid in the development of various Schottky catalysts for heterogeneous photo-Fenton-based environmental remediation systems.
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de Sousa Filho IA, Freire DO, Weber IT. Organic load removal and microbial disinfection of raw domestic sewage using SrSnO 3/g-C 3N 4 with sunlight. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:45009-45018. [PMID: 33856629 DOI: 10.1007/s11356-021-13526-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Sewage treatment and water reuse are, undoubtedly, one of the main points on scientific agenda of the 21st century. Many technologies for sewage treatment are available; however, it is still as an open issue that deserves much attention in order to facilitate their application, develop more effective methods and propose alternative treatment for unusual situations. Developing high performance materials for sewage treatment fits the idea of the development of efficient and alternative methods for microorganism removal and the high organic load of wastewater and is of fundamental importance. In this paper, a heterojunction with perovskite-type strontium stannate (SrSnO3) and graphitic carbon nitride (g-C3N4) - SrSnO3/g-C3N4 - was synthesized and used for photocatalytic treatment of domestic sewage using only sunlight. Results were accompanied by assessing the total organic carbon decrease and removal of pathogenic microorganisms. X-ray diffraction and X-ray excited photoelectron spectroscopy demonstrated that a heterostructure was successfully formed and photocatalytic tests showed an important activity in the visible range, i.e., under sunlight. Exposing raw sewage to 240 min (from 11 a.m. until 3 p.m.) in the presence of SrSnO3/g-C3N4, led to a 56.1% mineralization. This process was 2.5 more efficient than photolysis under sunlight. Moreover, the treated sewage showed no coliform growth (either fecal or total) or heterotrophic bacteria. This simple treatment makes sewage suitable and safe for reuse, for example, for agriculture purposes according to Brazilian regulations criteria and could be an alternative for isolated areas in which sewage treatment plants are not available.
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Affiliation(s)
| | | | - Ingrid Távora Weber
- Instituto de Química, Universidade de Brasília, Brasília, DF, 70910-900, Brazil.
- LIMA, Chemistry Institute, University of Brasília - UnB, P.O. Box 04478, Brasília, 70904-970, Brazil.
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31
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Manipulating Intermediates at the Au–TiO 2 Interface over InP Nanopillar Array for Photoelectrochemical CO 2 Reduction. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02043] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Shen H, Qileng A, Yang H, Liang H, Zhu H, Liu Y, Lei H, Liu W. "Dual-Signal-On" Integrated-Type Biosensor for Portable Detection of miRNA: Cas12a-Induced Photoelectrochemistry and Fluorescence Strategy. Anal Chem 2021; 93:11816-11825. [PMID: 34461727 DOI: 10.1021/acs.analchem.1c02395] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The abnormal expression of microRNA (miRNA) can affect the RNA transcription and protein translation, leading to tumor progression and metastasis. Currently, the accurate detection of aberrant expression of miRNA, particularly using a portable detection system, remains a great challenge. Herein, a novel dual-mode biosensor with high sensitivity and robustness for miR-21 detection was developed based on the cis-cleavage and trans-cleavage activities of Cas12a. miRNA can be combined with hairpin DNA-horseradish peroxidase anchored on a CdS/g-C3N4/B-TiO2 photoelectrode, thus the nonenzymatic amplification was triggered to form numerous HRP-modified double-stranded DNA (HRP-dsDNA). Then, HRP-dsDNA can be specifically recognized and efficiently cis-cleaved by Cas12a nucleases to detach HRP from the substrate, while the remaining HRP on HRP-dsDNA can catalyze 4-chloro-1-naphthol (4-CN) to form biocatalytic precipitation (BCP) on the surface of the photoelectrode, and thus the photocurrent can be changed. Meanwhile, the trans-cleavage ability of Cas12a was activated, and nonspecifically degrade the FQ-reporter and a significant fluorescence signal can be generated. Such two different kinds of signals with independent transmission paths can mutually support to improve the performance of the detection platform. Besides, a portable device was constructed for the point-of-care (POC) detection of miR-21. Moreover, the dual-mode detection platform can be easily expanded for the specific detection of other types of biomarkers by changing the sequence of hairpin DNA, thereby promoting the establishment of POC detection for early cancer diagnosis.
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Affiliation(s)
- Haoran Shen
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
| | - Aori Qileng
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.,Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Hui Yang
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
| | - Hongzhi Liang
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
| | - Hongshuai Zhu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.,Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Yingju Liu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.,Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Hongtao Lei
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Weipeng Liu
- Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
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33
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Li X, Raza S, Liu C. Preparation of titanium dioxide modified biomass polymer microspheres for photocatalytic degradation of rhodamine-B dye and tetracycline. J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2021.04.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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34
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Humayun M, Ullah H, Tahir AA, Bin Mohd Yusoff AR, Mat Teridi MA, Nazeeruddin MK, Luo W. An Overview of the Recent Progress in Polymeric Carbon Nitride Based Photocatalysis. CHEM REC 2021; 21:1811-1844. [PMID: 33887089 DOI: 10.1002/tcr.202100067] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 01/07/2023]
Abstract
Recently, polymeric carbon nitride (g-C3 N4 ) as a proficient photo-catalyst has been effectively employed in photocatalysis for energy conversion, storage, and pollutants degradation due to its low cost, robustness, and environmentally friendly nature. The critical review summarized the recent development, fundamentals, nanostructures design, advantages, and challenges of g-C3 N4 (CN), as potential future photoactive material. The review also discusses the latest information on the improvement of CN-based heterojunctions including Type-II, Z-scheme, metal/CN Schottky junctions, noble metal@CN, graphene@CN, carbon nanotubes (CNTs)@CN, metal-organic frameworks (MOFs)/CN, layered double hydroxides (LDH)/CN heterojunctions and CN-based heterostructures for H2 production from H2 O, CO2 conversion and pollutants degradation in detail. The optical absorption, electronic behavior, charge separation and transfer, and bandgap alignment of CN-based heterojunctions are discussed elaborately. The correlations between CN-based heterostructures and photocatalytic activities are described excessively. Besides, the prospects of CN-based heterostructures for energy production, storage, and pollutants degradation are discussed.
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Affiliation(s)
- Muhammad Humayun
- Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, PR, China.,Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, PR, China
| | - Habib Ullah
- Environment and Sustainability Institute, University of Exeter, Penryn, TR10 9FE, Cornwall, United Kingdom
| | - Asif Ali Tahir
- Environment and Sustainability Institute, University of Exeter, Penryn, TR10 9FE, Cornwall, United Kingdom
| | - Abd Rashid Bin Mohd Yusoff
- Department of Physics, Swansea University, Vivian Tower, Singleton Park, SA2 8PP, Swansea, United Kingdom
| | - Mohd Asri Mat Teridi
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia, 43600, UKM Bangi, Selangor, Malaysia
| | - Mohammad Khaja Nazeeruddin
- Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Rue de l'Industrie 17, CH-1951, Sion, Switzerland
| | - Wei Luo
- Engineering Research Center for Functional Ceramics of the Ministry of Education, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, PR, China.,Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, PR, China
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35
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Ma K, Dong Y, Zhang M, Xu C, Ding Y. A homogeneous Cu-based polyoxometalate coupled with mesoporous TiO2 for efficient photocatalytic H2 production. J Colloid Interface Sci 2021; 587:613-621. [DOI: 10.1016/j.jcis.2020.11.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 10/23/2022]
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36
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Cai S, Chen J, Li Q, Jia H. Enhanced Photocatalytic CO 2 Reduction with Photothermal Effect by Cooperative Effect of Oxygen Vacancy and Au Cocatalyst. ACS APPLIED MATERIALS & INTERFACES 2021; 13:14221-14229. [PMID: 33734661 DOI: 10.1021/acsami.0c23036] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
CO2 conversion into chemical fuels is a sustainable approach to the concurrent mitigation of the energy crisis and the greenhouse effect. It is still urgently desirable but quite challenging to explore a promising catalyst for CO2 photoreduction due to the severity in the fast recombination of electron holes and the deficiency of active sites, which have a tremendous influence on the catalytic behavior. In this regard, mesoporous TiO2 nanospheres containing oxygen vacancies (OVs) and metallic Au nanoparticles (NPs) were successfully prepared and showed markedly enhanced CO2 reduction activity and CH4 selectivity by the simple combination of photocatalysis with the simultaneous photothermal effect under full-spectrum irradiation. The dual introduction of OVs and a Au/TiO2 Schottky junction can not only serve as an electron sink to significantly improve the charge separation/transfer efficiency but also show effective photothermal conversion to raise the local temperature of the catalyst, thus resulting in an enhanced shuttle of electrons and desorption of products. This study not only offers new insights into the integrated tuning of charge recombination processes but also demonstrates that the photothermocatalysis has great potential in CO2 reduction.
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Affiliation(s)
- Songcai Cai
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jing Chen
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Qiang Li
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hongpeng Jia
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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37
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Jia L, He G, Zhang Y, Caro J, Jiang H. Hydrogen Purification through a Highly Stable Dual‐Phase Oxygen‐Permeable Membrane. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202010184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lujian Jia
- Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Songling Road No.189 Qingdao 266101 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Guanghu He
- Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Songling Road No.189 Qingdao 266101 China
| | - Yan Zhang
- Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Songling Road No.189 Qingdao 266101 China
| | - Jürgen Caro
- Institute of Physical Chemistry and Electrochemistry Leibniz University of Hannover Callinstrasse 3A 30167 Hannover Germany
| | - Heqing Jiang
- Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Songling Road No.189 Qingdao 266101 China
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38
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Jia L, He G, Zhang Y, Caro J, Jiang H. Hydrogen Purification through a Highly Stable Dual-Phase Oxygen-Permeable Membrane. Angew Chem Int Ed Engl 2021; 60:5204-5208. [PMID: 32924212 PMCID: PMC7986621 DOI: 10.1002/anie.202010184] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Indexed: 11/30/2022]
Abstract
Using oxygen permeable membranes (OPMs) to upgrade low‐purity hydrogen is a promising concept for high‐purity H2 production. At high temperatures, water dissociates into hydrogen and oxygen. The oxygen permeates through OPM and oxidizes hydrogen in a waste stream on the other side of the membrane. Pure hydrogen can be obtained on the water‐splitting side after condensation. However, the existing Co‐ and Fe‐based OPMs are chemically instable as a result of the over‐reduction of Co and Fe ions under reducing atmospheres. Herein, a dual‐phase membrane Ce0.9Pr0.1O2−δ‐Pr0.1Sr0.9Mg0.1Ti0.9O3−δ (CPO‐PSM‐Ti) with excellent chemical stability and mixed oxygen ionic‐electronic conductivity under reducing atmospheres was developed for H2 purification. An acceptable H2 production rate of 0.52 mL min−1 cm−2 is achieved at 940 °C. No obvious degradation during 180 h of operation indicates the robust stability of CPO‐PSM‐Ti membrane. The proven mixed conductivity and excellent stability of CPO‐PSM‐Ti give prospective advantages over existing OPMs for upgrading low‐purity hydrogen.
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Affiliation(s)
- Lujian Jia
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Road No.189, Qingdao, 266101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guanghu He
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Road No.189, Qingdao, 266101, China
| | - Yan Zhang
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Road No.189, Qingdao, 266101, China
| | - Jürgen Caro
- Institute of Physical Chemistry and Electrochemistry, Leibniz University of Hannover, Callinstrasse 3A, 30167, Hannover, Germany
| | - Heqing Jiang
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Road No.189, Qingdao, 266101, China
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39
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NiO Decorated Ti/TiO2 Nanotube Arrays (TiO2NT)/TiO2/g-C3N4 Step-Scheme Heterostructure Thin Film Photocatalyst with Enhanced Photocatalytic Activity for Water Splitting. Catal Letters 2021. [DOI: 10.1007/s10562-021-03545-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Niazi Z, Goharshadi EK, Mashreghi M, Jorabchi MN. Highly efficient solar photocatalytic degradation of a textile dye by TiO 2/graphene quantum dots nanocomposite. Photochem Photobiol Sci 2021; 20:87-99. [PMID: 33721238 DOI: 10.1007/s43630-020-00005-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 12/11/2020] [Indexed: 10/22/2022]
Abstract
Herein, two sunlight responsive photocatalysts including TiO2 nanoparticles (NPs) and TiO2/graphene quantum dots (GQDs) nanocomposite for degrading a textile dye, Reactive Black 5 (RB5), were prepared. The results showed that 100% of 50 ppm RB5 could be degraded by TiO2 NPs and TiO2/GQDs within 60 and 30 min sunlight irradiation, respectively. Hence, much better photocatalytic activity in degradation of RB5 was achieved by TiO2/GQDs under sunlight irradiation compared with pure TiO2 NPs due to its lower band gap (2.13 eV) and electron/hole recombination rate. The photocatalytic degradation mechanism of RB5 by TiO2 NPs was elucidated by adding some scavengers to the solution. The main reactive species contributing to RB5 degradation were surface hydroxyl radicals. The first-order solar degradation rate constant of RB5 for TiO2/GQDs is greater than that of TiO2 NPs under sunlight illumination.
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Affiliation(s)
- Zohreh Niazi
- Chemistry Department, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran
| | - Elaheh K Goharshadi
- Chemistry Department, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran. .,Nano Research Center, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran.
| | - Mansour Mashreghi
- Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran
| | - Majid Namayandeh Jorabchi
- Chemistry Department, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran.,Institute of Chemistry, Physical and Theoretical Chemistry, University of Rostock, Albert-Einstein-Straße 21, 18059, Rostock, Germany
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41
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Synthesis and characterization of Graphitic Carbon Nitride/Mesoporous Nano-Silica (g-C3N4/KCC-1) nanocomposite as a novel highly efficient and recyclable photocatalyst for degradation of antibiotic in aqueous solution. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-020-04358-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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42
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Choi H, Lee J, Kim D, Kumar A, Jeong B, Kim KJ, Lee H, Park JY. Influence of lattice oxygen on the catalytic activity of blue titania supported Pt catalyst for CO oxidation. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02166k] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of oxygen defect sites in the reaction mechanism for CO oxidation using blue TiO2 with a higher concentration of oxygen vacancies deposited by Pt nanoparticles is investigated.
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Affiliation(s)
- Hanseul Choi
- Department of Chemistry
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
- Center for Nanomaterials and Chemical Reactions
| | - Jinsun Lee
- Department of Chemistry
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
- Center for Integrated Nanostructure Physics
| | - Daeho Kim
- Department of Chemistry
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
- Center for Nanomaterials and Chemical Reactions
| | - Ashwani Kumar
- Department of Chemistry
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
- Center for Integrated Nanostructure Physics
| | - Beomgyun Jeong
- Advanced Nano Surface Research Group
- Korea Basic Science Institute (KBSI)
- Daejeon 34133
- Republic of Korea
| | - Ki-Jeong Kim
- Beamline Research Division
- Pohang Accelerator Laboratory (PAL)
- Pohang 37673
- Republic of Korea
| | - Hyoyoung Lee
- Department of Chemistry
- Sungkyunkwan University
- Suwon 440-746
- Republic of Korea
- Center for Integrated Nanostructure Physics
| | - Jeong Young Park
- Department of Chemistry
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Republic of Korea
- Center for Nanomaterials and Chemical Reactions
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43
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Bai X, Jia T, Wang X, Hou S, Hao D, Bingjie-Ni. High carrier separation efficiency for a defective g-C3N4 with polarization effect and defect engineering: mechanism, properties and prospects. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00595b] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Different types of defects in g-C3N4 induce polarization effect to promote the separation of charge carriers and improve the photocatalytic efficiency.
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Affiliation(s)
- Xiaojuan Bai
- Key Laboratory of Urban Stormwater System and Water Environment
- Ministry of Education
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Tianqi Jia
- Key Laboratory of Urban Stormwater System and Water Environment
- Ministry of Education
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Xuyu Wang
- Key Laboratory of Urban Stormwater System and Water Environment
- Ministry of Education
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Shanshan Hou
- Key Laboratory of Urban Stormwater System and Water Environment
- Ministry of Education
- Beijing University of Civil Engineering and Architecture
- Beijing 100044
- China
| | - Derek Hao
- Centre for Technology in Water and Wastewater (CTWW)
- School of Civil and Environmental Engineering
- University of Technology Sydney (UTS)
- Sydney
- Australia
| | - Bingjie-Ni
- Centre for Technology in Water and Wastewater (CTWW)
- School of Civil and Environmental Engineering
- University of Technology Sydney (UTS)
- Sydney
- Australia
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44
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Wang J, Lin W, Hu H, Liu C, Cai Q, Zhou S, Kong Y. Engineering Z-system hybrids of 0D/2D F-TiO2 quantum dots/g-C3N4 heterostructures through chemical bonds with enhanced visible-light photocatalytic performance. NEW J CHEM 2021. [DOI: 10.1039/d0nj05500j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A Z-system hybrid of F-TiO2 quantum dots/g-C3N4 nanosheets with an effective pathway (C–O bond) for charge transfer and selective recombination was constructed.
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Affiliation(s)
- Jian Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Wei Lin
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Hao Hu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Chunxia Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Qiong Cai
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Shijian Zhou
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Yan Kong
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
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45
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Li K, Xue Y, Zhang L, Han Y. β-FeOOH/Fe-TiO 2 heterojunctions on Ti for bacteria inactivation under light irradiation and biosealing. Biomater Sci 2020; 8:6004-6016. [PMID: 32996477 DOI: 10.1039/d0bm01290d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Intraosseous transcutaneous implants transferring mechanical stress directly from the skeleton to a prosthesis are an area of biological mechanics. However, bacterial invasion and weak biosealing with skin tissue usually induce implant failure. In this paper, composite coatings consisting of β-FeOOH as an outer layer and Fe-TiO2 as an inner layer were prepared on Ti via micro-arc oxidation and hydrothermal treatment (HT). The surface microstructures and optical absorption properties of the coatings were observed, the production of reactive oxygen species (ROS) was measured, Staphylococcus aureus (S. aureus) and fibroblast behaviors were studied in vitro, and bacteria inactivation and skin tissue responses on different surfaces were evaluated in vivo. The results show that Fe3+ was doped into TiO2 and β-FeOOH nanoparticles were gradually deposited on TiO2 during HT treatment, forming β-FeOOH/Fe-TiO2 heterojunctions. The light absorption of the composite coatings shifted to the longer wavelength region because of a narrowed TiO2 bandgap and the formation of heterojunctions. Under light irradiation, photoinduced electrons and holes on the heterojunctions were separated efficiently. Via optimizing the amount of Fe3+ in TiO2, ROS that formed at the heterojunctions after light irradiation for 10 min could kill 80% of S. aureus compared with pure Ti in vitro, but they did not affect fibroblast behavior, including proliferation and phenotyping. In vivo, the optimized β-FeOOH/Fe-TiO2 heterojunctions, upon light irradiation, could inhibit bacterial infection, suppress an inflammatory response, and promote integration with skin tissue. Such results provide a new perspective suggesting the potential application of β-FeOOH/Fe-TiO2 heterojunctions in percutaneous Ti implants, especially in infected cases.
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Affiliation(s)
- Kai Li
- State-key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.
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46
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Qi H, Shi C, Jiang X, Teng M, Sun Z, Huang Z, Pan D, Liu S, Guo Z. Constructing CeO 2/nitrogen-doped carbon quantum dot/g-C 3N 4 heterojunction photocatalysts for highly efficient visible light photocatalysis. NANOSCALE 2020; 12:19112-19120. [PMID: 32926033 DOI: 10.1039/d0nr02965c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ternary CeO2/nitrogen-doped carbon quantum dot (NCQD)/graphitic carbon nitride (g-C3N4) heterojunction nanocomposites were prepared by a high-temperature calcination and hydrothermal method and tested for degrading tetracycline (TC) and generating H2. Compared with CeO2 and g-C3N4, the Z-scheme CeO2/NCQDs/g-C3N4 (CSNx, where x represents the amount of CeO2 in wt%) nanoparticles showed a higher TC photodegradation capacity and H2 evolution ability owing to enhanced efficient charge separation and photocatalytic stability. CSN5 showed the best photodegradation activity for TC degradation (100 mL, 20 mg L-1; 100% degradation in 60 min; λ≥ 420 nm) and the highest H2 evolution rate of 1275.42 μmol h-1 g-1 was approximately 3.73- and 32.25-times higher than those of pristine g-C3N4 (341.85 μmol h-1 g-1) and pure CeO2 (39.55 μmol h-1 g-1), respectively. Superoxide (˙O2-) and hydroxyl (˙OH) radicals were also confirmed to be formed on the sample surface for TC photocatalytic degradation. As an electronic medium, NCQDs transferred electrons between the g-C3N4 and CeO2 interface to promote the electron-hole separation. This work affords a helpful perspective for synthesizing efficient charge separation and environmentally friendly photocatalysts by controlling the surface heterostructure.
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Affiliation(s)
- Houjuan Qi
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), College of Material Science and Engineering, Ministry of Education, Harbin 150040, China.
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47
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Thermo-responsive functionalized PNIPAM@Ag/Ag3PO4/CN-heterostructure photocatalyst with switchable photocatalytic activity. CHINESE JOURNAL OF CATALYSIS 2020. [DOI: 10.1016/s1872-2067(20)63554-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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48
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Crystal refinement of rutile by sonochemical method to achieve high performance Pd catalysts for direct synthesis of hydrogen peroxide. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.09.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Kato K, Xin Y, Hong J, Katsumata KI, Shirai T. Synthesis of core/shell Ti/TiOx photocatalyst via single-mode magnetic microwave assisted direct oxidation of TiH2. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yang J, Zhu H, Peng Y, Li P, Chen S, Yang B, Zhang J. Photocatalytic Performance and Degradation Pathway of Rhodamine B with TS-1/C 3N 4 Composite under Visible Light. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E756. [PMID: 32326608 PMCID: PMC7221997 DOI: 10.3390/nano10040756] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 04/08/2020] [Accepted: 04/13/2020] [Indexed: 11/16/2022]
Abstract
TS-1/C3N4 composites were prepared by calcining the precursors with cooling crystallization method and were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), UV-Vis diffuse reflection spectrum (DRS) and nitrogen adsorption-desorption isotherm. The photocatalytic performance of TS-1/C3N4 composites was investigated to degrade Rhodamine B (RhB) under visible light irradiation. The results showed that all composites exhibited better photocatalytic performance than pristine TS-1 and C3N4; TS-1/C3N4-B composite (the measured mass ratio of TS-1 to C3N4 is 1:4) had best performance, with a rate constant of 0.04166 min-1, which is about two and ten times higher than those of C3N4 and TS-1, respectively. We attributed the enhanced photocatalytic performance of TC-B to the optimized heterostructure formed by TS-1 and C3N4 with proper proportion. From the results of photoluminescence spectra (PL) and the enhanced photocurrent, it is concluded that photogenerated electrons and holes were separated more effectively in TS-1/C3N4 composites. The contribution of the three main active species for photocatalytic degradation followed a decreasing order of ·O2-, ·OH and h+. The degradation products of RhB were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS), and the possible photocatalytic degradation pathways were proposed.
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Affiliation(s)
- Jingjing Yang
- Department of Environment and Quality Test, Chongqing Chemical Industry Vocational College, Chongqing 401228, China; (J.Y.); (P.L.); (S.C.)
| | - Hongqing Zhu
- College of Resources and Environment, Southwest University, Chongqing 400715, China;
| | - Yuan Peng
- College of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China;
| | - Pengxi Li
- Department of Environment and Quality Test, Chongqing Chemical Industry Vocational College, Chongqing 401228, China; (J.Y.); (P.L.); (S.C.)
| | - Shuyan Chen
- Department of Environment and Quality Test, Chongqing Chemical Industry Vocational College, Chongqing 401228, China; (J.Y.); (P.L.); (S.C.)
| | - Bing Yang
- Department of Environment and Quality Test, Chongqing Chemical Industry Vocational College, Chongqing 401228, China; (J.Y.); (P.L.); (S.C.)
| | - Jinzhong Zhang
- College of Resources and Environment, Southwest University, Chongqing 400715, China;
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