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Berhe MG, Gebreslassie YT. Biomedical Applications of Biosynthesized Nickel Oxide Nanoparticles. Int J Nanomedicine 2023; 18:4229-4251. [PMID: 37534055 PMCID: PMC10390717 DOI: 10.2147/ijn.s410668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 07/10/2023] [Indexed: 08/04/2023] Open
Abstract
Nickel oxide nanoparticles have gained tremendous attention recently in a variety of scientific domains thanks to their characteristic chemical, physical, optical, and biological properties. Due to the diversity of applications in various fields, different physicochemical methods have been used to synthesize nickel oxide nanoparticles. However, most conventional methods use hazardous chemicals during synthesis and become liable for potential health risks, while others are expensive and require a lot of energy to synthesize nanoparticles. As a result, the nanoparticles become less biocompatible and biologically inefficient. Biogenic synthesis of nanoparticles is currently proposed as a valuable alternative to the physical and chemical methods, as it is a simple, non-toxic, cheap, green and facile approach. This synthetic method uses biological substrates such as plant extracts, microorganisms, and other biological products to synthesize nickel oxide nanoparticles. The various phytochemicals from plant extracts, enzymes or proteins from microorganisms, and other biological derivatives play as reducing, stabilizing, and capping agents to provide bioactive and biocompatible nickel oxide nanoscale material. This review discusses current findings and trends in the biogenic synthesis of nickel oxide nanoparticles and their biological activities such as antibacterial, antifungal, antileishmanial, and anticancer, with an emphasis on antimicrobial and anticancer activity along with their mechanistic elucidation. Overall, this thorough study provides insight into the possibilities for the future development of green nickel oxide nanoparticles as therapeutic agents for a variety of ailments.
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Affiliation(s)
- Mearg Gidey Berhe
- Department of Physics, College of Natural and Computational Science, Adigrat University, Adigrat, Ethiopia
| | - Yemane Tadesse Gebreslassie
- Department of Chemistry, College of Natural and Computational Science, Adigrat University, Adigrat, Ethiopia
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2
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Wang Z, Jing C, Zhai W, Li Y, Liu W, Zhang F, Li S, Wang H, Yu D. MIL-101(Fe)/Polysulfone Hollow Microspheres from Pickering Emulsion Template for Effective Photocatalytic Degradation of Methylene Blue. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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3
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Elimination of toxic azo dye using a calcium alginate beads impregnated with NiO/activated carbon: Preparation, characterization and RSM optimization. Int J Biol Macromol 2023; 233:123582. [PMID: 36764345 DOI: 10.1016/j.ijbiomac.2023.123582] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/20/2023] [Accepted: 02/04/2023] [Indexed: 02/11/2023]
Abstract
Nickel oxide nanoparticles supported activated carbon (AC-NiO) was fabricated using thermal activation. Then, AC-NiO composite was immobilized on alginate beads to obtain 3-dimensional network structure ALG@AC-NiO nanocomposite beads for catalytic reduction of Congo red (CR) dye. The resulting nanocomposite beads were identified by various physical techniques. The crystalline nature and dispersion of NiO nanoparticles was defined by the XRD and EDS techniques, respectively. ALG@AC-NiO beads have a Ni element content of 4.65 wt% with an average NiO particle diameter of 23 nm. The statistical approach mathematically describes the catalytic reduction of the CR dye as a function of the NaBH4 concentration, the catalyst dose and the concentration of the CR dye modeled by a BBD-RSM. According to the statistical modeling and the optimization process, the catalytic optimum conditions were obtained for NaBH4 concentration of 0.05 M, catalyst dose of 11 mg and CR dye concentration of 80 ppm who permit meet 99.67 % of CR dye conversion. The adjusted coefficient of determination (R2 = 0.9957) indicates that the considered model was quite suitable with a good correlation between the experiment and predicted.
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Hadadi NA, Baig U, Gondal M, Mohamed M, Dastageer M. Pulsed Laser Induced Synthesis of Graphitic Carbon Nitride-Cadmium Selenide nanocomposite for Photo-catalytic Degradation of Organic Dyes, and Electro-catalytic Hydrogen Evolution Reaction. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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5
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Sol-Gel Synthesized High Entropy Metal Oxides as High-Performance Catalysts for Electrochemical Water Oxidation. Molecules 2022; 27:molecules27185951. [PMID: 36144684 PMCID: PMC9504205 DOI: 10.3390/molecules27185951] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/03/2022] [Accepted: 09/05/2022] [Indexed: 11/17/2022] Open
Abstract
Hexanary high-entropy oxides (HEOs) were synthesized through the mechanochemical sol-gel method for electrocatalytic water oxidation reaction (WOR). As-synthesized catalysts were subjected to characterization, including X-ray diffraction (XRD), Fourier transforms infrared (FTIR) analysis, and scanning electron microscopy (SEM). All the oxide systems exhibited sharp diffraction peaks in XRD patterns indicating the defined crystal structure. Strong absorption between 400–700 cm−1 in FTIR indicated the formation of metal-oxide bonds in all HEO systems. WOR was investigated via cyclic voltammetry using HEOs as electrode platforms, 1M KOH as the basic medium, and 1M methanol (CH3OH) as the facilitator. Voltammetric profiles for both equiatomic (EHEOs) and non-equiatomic (NEHEOs) were investigated, and NEHEOs exhibited the maximum current output for WOR. Moreover, methanol addition improved the current profiles, thus leading to the electrode utility in direct methanol fuel cells as a sequential increase in methanol concentration from 1M to 2M enhanced the OER current density from 61.4 to 94.3 mA cm−2 using NEHEO. The NEHEOs comprising a greater percentage of Al, ([Al0.35(Mg, Fe, Cu, Ni, Co)0.65]3O4) displayed high WOR catalytic performance with the maximum diffusion coefficient, D° (10.90 cm2 s−1) and heterogeneous rate constant, k° (7.98 cm s−1) values. These primary findings from the EC processes for WOR provide the foundation for their applications in high-energy devices. Conclusively, HEOs are proven as novel and efficient catalytic platforms for electrochemical water oxidation.
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Subhan A, Mourad AHI, Al-Douri Y. Influence of Laser Process Parameters, Liquid Medium, and External Field on the Synthesis of Colloidal Metal Nanoparticles Using Pulsed Laser Ablation in Liquid: A Review. NANOMATERIALS 2022; 12:nano12132144. [PMID: 35807980 PMCID: PMC9268572 DOI: 10.3390/nano12132144] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/09/2022] [Accepted: 06/16/2022] [Indexed: 01/27/2023]
Abstract
Pulsed laser ablation in liquid, used for nanoparticle synthesis from solid bulk metal targets (a top-down approach), has been a hot topic of research in the past few decades. It is a highly efficient and ‘green’ fabrication method for producing pure, stable, non-toxic (ligand-free), colloidal nanoparticles, which is often challenging using traditional chemical methods. Due to the short time scale interaction between the laser pulses and the target, it is difficult to achieve complete control on the physical characteristics of metallic nanoparticles. Laser process parameters, liquid environment, and external fields vastly effect the shape and structure of nanoparticles for targeted applications. Past reviews on pulsed laser ablation have focused extensively on synthesising different materials using this technique but little attention has been given to explaining the dependency aspect of the process parameters in fine-tuning the nanoparticle characteristics. In this study, we reviewed the state of the art literature available on this technique, which can help the scientific community develop a comprehensive understanding with special insights into the laser ablation mechanism. We further examined the importance of these process parameters in improving the ablation rate and productivity and analysed the morphology, size distribution, and structure of the obtained nanoparticles. Finally, the challenges faced in nanoparticle research and prospects are presented.
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Affiliation(s)
- Abdul Subhan
- Mechanical and Aerospace Engineering Department, United Arab Emirates University, Al-Ain P.O. Box 15551, United Arab Emirates;
| | - Abdel-Hamid Ismail Mourad
- Mechanical and Aerospace Engineering Department, United Arab Emirates University, Al-Ain P.O. Box 15551, United Arab Emirates;
- National Water and Energy Center, United Arab Emirates University, Al-Ain P.O. Box 15551, United Arab Emirates
- Mechanical Design Department, Faculty of Engineering, El Mataria, Helwan University, Cairo 11795, Egypt
- Correspondence:
| | - Yarub Al-Douri
- Engineering Department, American University of Iraq-Sulaimani, Sulaimani P.O. Box 46001, Kurdistan Region, Iraq;
- Department of Mechatronics Engineering, Faculty of Engineering and Natural Sciences, Bahcesehir University, Besiktas, Istanbul 34349, Turkey
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Maghemite nanoparticles decorated semiconducting graphitic carbon nitride hetero-structured nanocomposite: Facile synthesis, characterizations and its visible light active photocatalytic system for removal of hazardous organic pollutants from aqueous solutions. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Gawai UP, Kamble SD, Gurav SK, Singh MN, Yadav AK, Jha SN, Lalla NP, Bodke MR, Shirsat MD, Dole BN. Microwave-Assisted Coprecipitation Synthesis and Local Structural Investigation on NiO, β-Ni(OH) 2/Co 3O 4 Nanosheets, and Co 3O 4 Nanorods Using X-ray Absorption Spectroscopy at Co-Ni K-edge and Synchrotron X-ray Diffraction. ACS OMEGA 2022; 7:6700-6709. [PMID: 35252665 PMCID: PMC8892484 DOI: 10.1021/acsomega.1c06179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Developing the most straightforward, cheapest, and eco-friendly approaches for synthesizing nanostructures with well-defined morphology having the highest possible surface area to volume ratio is challenging for design and process. In the present work, nanosheets of NiO and β-Ni(OH)2/Co3O4, and nanorods of Co3O4 have been synthesized at a large scale via the microwave-assisted chemical coprecipitation method under low temperature and atmospheric pressure. X-ray absorption spectroscopy (XAS) measurements, which comprises both X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) techniques, have been carried out at Co and Ni K-edges to probe the electronic structure of the samples. Also, the local atomic structural, chemical bonding, morphological, and optical properties of the sample were systematically investigated using XAS, synchrotron X-ray diffraction (SXRD), Raman spectroscopy, FTIR, transmission electron microscopy (TEM), and UV-visible spectroscopy. The normalized XANES spectra of the β-Ni(OH)2/Co3O4 nanosheets show the presence of Ni2+ and a mixed oxidation state of Co. The disorder factor decreases from β-Ni(OH)2/Co3O4 to Co3O4 with increasing Co-O bond length. The SXRD pattern analyzed using Rietveld refinement reveals that NiO has a face-centered cubic phase, Co3O4 has the standard spinal structure, and β-Ni(OH)2/Co3O4 has a mixed phase of hexagonal and cubic structures. TEM images revealed the formation of nanosheets for NiO and β-Ni(OH)2/Co3O4 samples and nanorods for Co3O4 samples. FTIR and Raman spectra show the formation of β-Ni(OH)2/Co3O4, which reveals the fingerprints of Ni-O and Co-O.
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Affiliation(s)
- Umesh P. Gawai
- Department
of Physics, DDSP, Arts Commerce & Science
College, Erandol, Jalgaon 425 109, M.S., India
| | - Shilpa D. Kamble
- Department
of Physics, Shri Madhavrao Patil Mahavidyalaya, Murum, Osmanabad 413 606, India
| | - Sanjay K. Gurav
- Department
of Physics, Shri Madhavrao Patil Mahavidyalaya, Murum, Osmanabad 413 606, India
| | - Manvendra N. Singh
- Synchrotrons
Utilization Section, Raja Ramanna Centre
for Advanced Technology, Indore 452 013, India
| | - Ashok K. Yadav
- Atomic
& Molecular Physics Division, Bhabha
Atomic Research Centre, Mumbai 400 094 India
| | - Shambhu N. Jha
- Beamline
Development & Application Section, Bhabha
Atomic Research Centre, Mumbai 400 094, India
| | - Niranjan P. Lalla
- UGC−DAE
Consortium for Scientific Research, University
Campus, Khandwa Road, Indore 452 001, India
| | - Milind R. Bodke
- Department
of Electronics, Modern College of Arts,
Commerce & Science, Shivaji Nagar, Pune 411
005, M.S., India
| | - Mahendra D. Shirsat
- Department
of Physics & RUSA Centre for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431 004, M.S., India
| | - Babasaheb N. Dole
- Department
of Physics, Dr. Babasaheb Ambedkar Marathwada
University, Aurangabad 431 004, M.S., India
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Kostopoulou A, Brintakis K, Sygletou M, Savva K, Livakas N, Pantelaiou MA, Dang Z, Lappas A, Manna L, Stratakis E. Laser-Induced Morphological and Structural Changes of Cesium Lead Bromide Nanocrystals. NANOMATERIALS 2022; 12:nano12040703. [PMID: 35215031 PMCID: PMC8879588 DOI: 10.3390/nano12040703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 02/01/2023]
Abstract
Metal halide perovskite nanocrystals, an emerging class of materials for advanced photonic and optoelectronic applications, are mainly fabricated with colloidal chemistry routes. On the quest for new properties according to application needs, new perovskite systems of various morphologies and levels of doping and alloying have been developed, often also involving post-synthesis reactions. Recently, laser irradiation in liquids has been utilized as a fast method to synthesize or transform materials and interesting laser-induced transformations on nanocrystals were induced. These studies in general have been limited to small nanocrystals (~15 nm). In the case of halide perovskites, fragmentation or anion exchange have been observed in such laser-based processes, but no crystal structure transformations were actually observed or deliberately studied. Nanocrystals are more sensitive to light exposure compared to the corresponding bulk crystals. Additional factors, such as size, morphology, the presence of impurities, and others, can intricately affect the photon absorption and heat dissipation in nanocrystal suspensions during laser irradiation. All these factors can play an important role in the final morphologies and in the time required for these transformations to unfold. In the present work, we have employed a 513 nm femtosecond (fs) laser to induce different transformations in large nanocrystals, in which two phases coexist in the same particle (Cs4PbBr6/CsPbBr3 nanohexagons of ~100 nm), dispersed in dichlorobenzene. These transformations include: (i) the exfoliation of the primary nanohexagons and partial anion exchange; (ii) fragmentation in smaller nanocubes and partial anion exchange; (iii) side-by-side-oriented attachment, fusion, and formation of nanoplatelets and complete anion exchange; (iv) side-by-side attachment, fusion, and formation of nanosheets. Partial or complete Br-Cl anion exchange in the above transformations was triggered by the partial degradation of dichlorobenzene. In addition to the detailed analysis of the various nanocrystal morphologies observed in the various transformations, the structure–photoluminescence relationships for the different samples were analyzed and discussed.
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Affiliation(s)
- Athanasia Kostopoulou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
- Correspondence: (A.K.); (K.B.); (E.S.); Tel.: +30-2810-391874 (A.K.); +30-2810-391874 (K.B.); +30-2810-391274 (E.S.)
| | - Konstantinos Brintakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
- Correspondence: (A.K.); (K.B.); (E.S.); Tel.: +30-2810-391874 (A.K.); +30-2810-391874 (K.B.); +30-2810-391274 (E.S.)
| | - Maria Sygletou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
| | - Kyriaki Savva
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
| | - Nikolaos Livakas
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
| | - Michaila Akathi Pantelaiou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
| | - Zhiya Dang
- Nanochemistry, Istituto Italiano di Tecnologia, 16163 Genova, Italy; (Z.D.); (L.M.)
| | - Alexandros Lappas
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
| | - Liberato Manna
- Nanochemistry, Istituto Italiano di Tecnologia, 16163 Genova, Italy; (Z.D.); (L.M.)
| | - Emmanuel Stratakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 71110 Heraklion, Greece; (M.S.); (K.S.); (N.L.); (M.A.P.); (A.L.)
- Department of Physics, University of Crete, 71003 Heraklion, Greece
- Correspondence: (A.K.); (K.B.); (E.S.); Tel.: +30-2810-391874 (A.K.); +30-2810-391874 (K.B.); +30-2810-391274 (E.S.)
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Gajurel S, Dam B, Bhushan M, Singh LR, Pal AK. CuO–NiO bimetallic nanoparticles supported on graphitic carbon nitride with enhanced catalytic performance for the synthesis of 1,2,3‐triazoles, bis‐1,2,3‐triazoles, and tetrazoles in parts per million level. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sushmita Gajurel
- Department of Chemistry, Centre for Advanced Studies North‐Eastern Hill University Shillong Meghalaya India
| | - Binoyargha Dam
- Department of Chemistry Indian Institute of Technology‐Guwahati Guwahati Assam India
- Department of Nanotechnology North‐Eastern Hill University Shillong Meghalaya India
| | - Mayank Bhushan
- Department of Nanotechnology North‐Eastern Hill University Shillong Meghalaya India
| | - L. Robindro Singh
- Department of Nanotechnology North‐Eastern Hill University Shillong Meghalaya India
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced Studies North‐Eastern Hill University Shillong Meghalaya India
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Baig U, Faizan M, Sajid M. Semiconducting graphitic carbon nitride integrated membranes for sustainable production of clean water: A review. CHEMOSPHERE 2021; 282:130898. [PMID: 34098310 DOI: 10.1016/j.chemosphere.2021.130898] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/09/2021] [Accepted: 05/14/2021] [Indexed: 06/12/2023]
Abstract
Semiconducting membranes integrated with nanomaterials have placed themselves in new emerging researches tremendously for seawater desalination, oil-water separation, disinfection, removal of inorganic as well as organic pollutants. Howbeit, only nanoparticles unified membranes show quite a lot lags in their performance, although some of these particles associated with the demerits of high cost. In contrast, graphitic carbon nitride incorporated membranes offered improved aforementioned properties corresponding to absolute essential qualities such as cost-effective, environmentally friendly, easy-to-operate, green manufacturing, anti-fouling, and low energy consumption. Moreover, their high mechanical strength, high stability against harsh environment and long-term utilization without flux reduction are strong plus. Even though there are some undeniable downsides of these membranes in real world applications as bulk synthesis, consistent dispersion of graphitic carbon nitride, low photocatalytic efficiency etc. Accordingly, in the present article, these frailties of the membranes having graphitic carbon nitride as a filler and their respective synthesis procedures and properties are discussed. A comprehensive analysis over the application of semiconducting graphitic carbon nitride incorporated membranes with and without special surface modification; and exploration of the future challenges and difficulties associated to these membranes are also reviewed. Consequently, the current article provides brief overview about graphitic carbon nitride integrated composite membranes as well as their applications, and it finished up with new thoughts of further improvements/modifications to overcome their shortcomings in actual environmental conditions.
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Affiliation(s)
- Umair Baig
- Interdisciplinary Research Center for Membranes & Water Security, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia; Center for Research Excellence in Desalination & Water Treatment, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.
| | - M Faizan
- Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
| | - Mohd Sajid
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
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A Comparative Study of Cerium- and Ytterbium-Based GO/g-C3N4/Fe2O3 Composites for Electrochemical and Photocatalytic Applications. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11199000] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The design of sustainable and efficient materials for efficient energy storage and degradation of environmental pollutants (specifically organic dyes) is a matter of major interest these days. For this purpose, cerium- and ytterbium-based GO/g-C3N4/Fe2O3 composites have been synthesized to explore their properties, especially in charge storage devices such as supercapacitors, and also as photocatalysts for the degradation of carcinogenic dyes from the environment. Physicochemical studies have been carried out using XRD, FTIR, SEM, and BET techniques. Electrochemical techniques (cyclic voltammetry, galvanic charge discharge, and electrochemical impedance spectroscopy) have been employed to measure super-capacitance and EDLC properties. Results show that the gravimetric capacitance calculated from GCD results is 219 Fg−1 for ytterbium- and 169 Fg−1 for cerium-based nanocomposites at the current density of 1 A/g and scan rate of 2 mV/sec. The specific capacitance calculated for the ytterbium-based nanocomposite is 189 Fg−1 as compared to 125 Fg−1 for the cerium-based material. EIS results pointed to an enhanced resistance offered by cerium-based nanocomposites as compared to that of ytterbium, which can be assumed with the difference in particle size, as confirmed from structural studies including XRD. From obtained results, ytterbium oxide-based GO/g-C3N4/Fe2O3 is proven to be a better electro-catalyst as compared to cerium-based nanocomposites. Photocatalytic results are also in agreement with electrochemical results, as the degradation efficiency of ytterbium oxide-based GO/g-C3N4/Fe2O3 (67.11 and 83.50% for rhodamine B and methylene blue dyes) surpasses values observed for cerium-based GO/g-C3N4/Fe2O3 (63.08 and 70.61%).
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13
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Laser assisted anchoring of cadmium sulfide nanospheres into tungsten oxide nanosheets for enhanced photocatalytic and electrochemical energy storage applications. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126318] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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14
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Zhang S, Wang Q, Dai F, Gu Y, Qian G, Chen C, Yu Y. Novel TiO 2 Nanoparticles/Polysulfone Composite Hollow Microspheres for Photocatalytic Degradation. Polymers (Basel) 2021; 13:polym13030336. [PMID: 33494382 PMCID: PMC7865213 DOI: 10.3390/polym13030336] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/16/2021] [Accepted: 01/18/2021] [Indexed: 11/16/2022] Open
Abstract
Nanosized titanium oxide (TiO2) material is a promising photocatalyst for the degradation of organic pollutants, whereas the difficulty of its recycling hinders its practical application. Herein, we reported the preparation of a novel titanium oxide/polysulfone (TiNPs/PSF) composite hollow microspheres by the combination of Pickering emulsification and the solvent evaporation technique and their application for the photodegradation of methyl blue (MB). P25 TiO2 nanoparticles dispersed on the surface of PSF microspheres. The porosity, density and photoactivity of the TiNPs/PSF composite microsphere are influenced by the TiO2 loading amount. The composite microsphere showed good methyl blue (MB) removal ability. Compared with TiO2 P25, and PSF, a much higher MB adsorption speed was observed for TiNPs/PSF microspheres benefited from their porous structure and the electrostatic attractions between the MB+ and the negatively charged PSF materials, and showed good degradation efficiency. For TiNPs/PSF composite microsphere with density close to 1, a 100% MB removal (10 mg L-1) within 120 min at a catalyst loading of 2.5 g L-1 can be obtained under both stirring and static condition, due to well dispersing of TiO2 particles on the microsphere surface and its stable suspending in water. For the non-suspended TiNPs/PSF composite microsphere with density bigger than 1, the 100% MB removal can be only obtained under stirring condition. The removal efficiency of MB for the composite microspheres retained 96.5%, even after 20 cycles. Moreover, this composite microsphere also showed high MB removal ability at acidic condition. The high catalysis efficiency, excellent reusability and good stability make this kind of TiNPs/PSF composite microsphere a promising photocatalyst for the water organic pollution treatment.
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