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Title: Influence of solvent on the morphology and photocatalytic properties of ZnS decorated CeO{sub 2} nanoparticles

Abstract

Herein, we report a theoretical and experimental study on the photocatalytic activity of CeO{sub 2} ZnS, and ZnS decorated CeO{sub 2} nanoparticles prepared by a microwave-assisted solvothermal method. Theoretical models were established to analyze electron transitions primarily at the interface between CeO{sub 2} and ZnS. As observed, the particle morphology strongly influenced the photocatalytic degradation of organic dye Rhodamine B. A model was proposed to rationalize the photocatalytic behavior of the prepared decorated systems taking into account different extrinsic and intrinsic defect distributions, including order-disorder effects at interfacial and intra-facial regions, and vacancy concentration.

Authors:
; ; ; ;  [1]; ; ;  [2]; ; ;  [3]
  1. INCTMN-UFSCar, Universidade Federal de São Carlos, Rod.Washington Luís Km 235, São Carlos 13565-905, SP (Brazil)
  2. Grupo de Modelagem e Simulação Molecular, INCTMN-UNESP, São Paulo State University, P.O. Box 47 3, Bauru 17033-360, SP (Brazil)
  3. INCTMN-UNESP, Universidade Estadual Paulista, P.O. Box 355, Araraquara 14801-907, SP (Brazil)
Publication Date:
OSTI Identifier:
22304213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CERIUM OXIDES; DEFECTS; DISTRIBUTION; INTERFACES; MICROWAVE RADIATION; NANOPARTICLES; PHOTOCATALYSIS; SIMULATION; SOLVENTS; VACANCIES; ZINC SULFIDES

Citation Formats

Raubach, Cristiane W., E-mail: cristiane@liec.ufscar.br, Polastro, Lisânias, Ferrer, Mateus M., Perrin, Andre, Perrin, Christiane, Albuquerque, Anderson R., Buzolin, Prescila G. C., Sambrano, Julio R., Santana, Yuri B. V. de, Varela, José A., and Longo, Elson. Influence of solvent on the morphology and photocatalytic properties of ZnS decorated CeO{sub 2} nanoparticles. United States: N. p., 2014. Web. doi:10.1063/1.4880795.
Raubach, Cristiane W., E-mail: cristiane@liec.ufscar.br, Polastro, Lisânias, Ferrer, Mateus M., Perrin, Andre, Perrin, Christiane, Albuquerque, Anderson R., Buzolin, Prescila G. C., Sambrano, Julio R., Santana, Yuri B. V. de, Varela, José A., & Longo, Elson. Influence of solvent on the morphology and photocatalytic properties of ZnS decorated CeO{sub 2} nanoparticles. United States. doi:10.1063/1.4880795.
Raubach, Cristiane W., E-mail: cristiane@liec.ufscar.br, Polastro, Lisânias, Ferrer, Mateus M., Perrin, Andre, Perrin, Christiane, Albuquerque, Anderson R., Buzolin, Prescila G. C., Sambrano, Julio R., Santana, Yuri B. V. de, Varela, José A., and Longo, Elson. Sat . "Influence of solvent on the morphology and photocatalytic properties of ZnS decorated CeO{sub 2} nanoparticles". United States. doi:10.1063/1.4880795.
@article{osti_22304213,
title = {Influence of solvent on the morphology and photocatalytic properties of ZnS decorated CeO{sub 2} nanoparticles},
author = {Raubach, Cristiane W., E-mail: cristiane@liec.ufscar.br and Polastro, Lisânias and Ferrer, Mateus M. and Perrin, Andre and Perrin, Christiane and Albuquerque, Anderson R. and Buzolin, Prescila G. C. and Sambrano, Julio R. and Santana, Yuri B. V. de and Varela, José A. and Longo, Elson},
abstractNote = {Herein, we report a theoretical and experimental study on the photocatalytic activity of CeO{sub 2} ZnS, and ZnS decorated CeO{sub 2} nanoparticles prepared by a microwave-assisted solvothermal method. Theoretical models were established to analyze electron transitions primarily at the interface between CeO{sub 2} and ZnS. As observed, the particle morphology strongly influenced the photocatalytic degradation of organic dye Rhodamine B. A model was proposed to rationalize the photocatalytic behavior of the prepared decorated systems taking into account different extrinsic and intrinsic defect distributions, including order-disorder effects at interfacial and intra-facial regions, and vacancy concentration.},
doi = {10.1063/1.4880795},
journal = {Journal of Applied Physics},
number = 21,
volume = 115,
place = {United States},
year = {Sat Jun 07 00:00:00 EDT 2014},
month = {Sat Jun 07 00:00:00 EDT 2014}
}
  • Graphical abstract: TiO{sub 2}/Bi{sub 2}(BDC){sub 3}/BiOCl nanoparticles decorated ultrathin nanosheets showed excellent photocatalytic reaction activity and selectivity. - Highlights: • TiO{sub 2}/Bi{sub 2}(BDC){sub 3}/BiOCl nanoparticles decorated ultrathin nanosheets were synthesized through a facile hydrothermal process. • The products showed excellent photocatalytic activities for the degradation of various dyes. • The photocatalytic activities of the composite materials could be easily adjusted through tuning the content of TiO{sub 2}. • TiO{sub 2}/Bi{sub 2}(BDC){sub 3}/BiOCl displayed obvious photocatalytic selectivity in mixed dyes systems of rhodamine B and eosin Y. - Abstract: Photocatalysts with excellent photocatalytic reaction activity and ideal selectivity are highly desirablemore » for pollutants clearance and purification of targeted organics from a mixture. Continued efforts toward the goal, we here present a facile hydrothermal route to synthesize TiO{sub 2}/Bi-benzenedicarboxylate/BiOCl nanoparticles decorated ultrathin nanosheets with a thickness less than 5 nm on a large scale. The as-synthesized products showed excellent photocatalytic activities for the degradation of various dyes such as rhodamine B, eosin Y and methylene blue in aqueous solution under visible light irradiation. The photocatalytic activities of TiO{sub 2}/Bi-benzenedicarboxylate/BiOCl nanocomposites for the degradation of rhodamine B and eosin Y could be adjusted through tuning the content of TiO{sub 2}. With increasing the amount of TiO{sub 2}, the composites showed declining photocatalytic activities in decomposing of rhodamine B while on the contrary they displayed enhanced photocatalytic activities in decomposing of eosin Y. Interestingly, TiO{sub 2}/Bi-benzenedicarboxylate/BiOCl composite nanosheets showed obvious photocatalytic selectivity in a mixed dyes system. The photocatalytic reaction and selectivity mechanisms of the nanocomposites for the degradation of the dyes were discussed on the basis of experimental results. The current study not only develops a new methodology to synthesize ultrathin nanosheets but also provides a novel strategy to design composite photocatalysts with high reaction activity and good selectivity.« less
  • Graphical abstract: Various nanostructure Bi{sub 2}MoO{sub 6} photocatalysts have been prepared by a solvothermal process via simply altering the used solvent. It is revealed that the type of solvents has a strong influence on the morphology of Bi{sub 2}MoO{sub 6}. This could be understood in terms of the reaction media effect on the crystal growth. The photocatalytic experiments for the decomposition of RhB demonstrate that the samples prepared by different solvents show different photocatalytic activity. The highest photocatalytic activity is obtained by the sample with glycol as solvent. Highlights: ► The used solvent in the synthesis can affect the morphologymore » and size of Bi{sub 2}MoO{sub 6}. ► Different solvent in the reaction leads to different surface area and pore size. ► The highest photocatalytic activity is obtained by the sample prepared in glycol. ► The high activity is mainly due to the large surface area and small particle size. - Abstract: Visible-light-driven photocatalyst Bi{sub 2}MoO{sub 6} was prepared by a solvothermal process with different kinds of solvent including water, isopropanol and ethylene glycol. The obtained samples were characterized by X-ray diffraction technique, N{sub 2}-sorption, UV–vis diffuse reflectance spectra, transmission electron microscopy and Fourier transform infrared spectroscopy. The results revealed that the type of solvent has a strong influence on the morphologies and physico-chemical properties of Bi{sub 2}MoO{sub 6}. Meanwhile, the formation mechanism of Bi{sub 2}MoO{sub 6} with various morphologies was discussed. The photocatalytic activities of Bi{sub 2}MoO{sub 6} photocatalysts were evaluated by the decomposition of rhodamine B (RhB) under visible light irradiation (λ > 420 nm). It was found that the sample prepared with glycol as solvent showed the best performance in the photodegradation of RhB under visible light irradiation. This could be ascribed to the large surface area, unique morphology and small particle size.« less
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  • BiOBr-sensitized–K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} composite photocatalysts (BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}) were fabricated by depositing BiOBr particles on the surface of K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} through a solvothermal method. The deposited BiOBr particles, with a uniform size of approximately 50 nm, were well dispersed on the surface of K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}, and improved the visible light absorption of the composite material. The photocatalytic activities were evaluated by degrading Rhodamine B (RhB) under visible light irradiation. The BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} composites exhibited superior performance over pure BiOBr, and the deposition of BiOBr particles onto themore » host K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} significantly increased the photocatalytic decolorization ability of K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}. An optimum loading of 45 wt% was found, and almost 95% of RhB could be degraded in 60 min under visible light irradiation using this preparation. Furthermore, the photocatalytic activity was stable in up to five consecutive runs. The enhancement in both photocatalytic activity and stability in the composites resulted from the closely contacted interfaces, which were beneficial for charge separation. The roles of the radical species were investigated, and the {sup ·}O{sub 2}{sup −} and h{sup +} were thought to dominate the photocatalytic process, while the {sup ·}OH was found to be relatively negligible. Based on the experimental results, a photocatalytic mechanism for organics degradation over BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} photocatalysts was proposed. - Graphical abstract: Photocatalytic reaction mechanisms of the as-prepared BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}. - Highlights: • BiOBr particle modified K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} were successfully synthesized by solvothermal method. • BiOBr greatly increased visible light absorption for K{sub 2}La{sub 2}Ti{sub 3}O{sub 10}. • The photocatalyst exhibited high activities for organics degradation. • Mechanisms of charge separation in the BiOBr/K{sub 2}La{sub 2}Ti{sub 3}O{sub 10} composites were proposed.« less
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