Photocatalytic decomposition of dyes using ZnO doped SnO2 nanoparticles prepared by solvothermal method (original) (raw)
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Materials Research Express
In this paper, ZnBiSbO 4 was synthesized by a solid-state reaction method for the first time. The structural and photocatalytic properties of ZnBiSbO 4 had been characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, transmission electron microscope and UV-visible spectrometer. ZnBiSbO 4 crystallized with a pyrochlore-type structure and a tetragonal crystal system. The band gap of ZnBiSbO 4 was estimated to be 2.49 eV. The photocatalytic degradation of indigo carmine was realized under visible light irradiation with ZnBiSbO 4 as a catalyst compared with nitrogen-doped TiO 2 (N-TiO 2) and CdBiYO 4. The results showed that ZnBiSbO 4 owned higher photocatalytic activity compared with N-TiO 2 or CdBiYO 4 for the photocatalytic degradation of indigo carmine under visible light irradiation. The reduction of the total organic carbon, the formation of inorganic products, SO 4 2− and NO 3 − , and the evolution of CO 2 revealed the continuous mineralization of indigo carmine during the photocatalytic process. One possible photocatalytic degradation pathway of indigo carmine was obtained. The phytotoxicity of the photocatalytic-treated indigo carmine (IC) wastewater was detected by examining its effect on seed germination and growth.
Asian Journal of Chemistry, 2019
Boron (B), carbon (C) and sulphur (S) doped ZnO-SnO2 were successfully prepared by facile precipitation method. As prepared nanocomposite photocatalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, high resolution transmission electron spectroscopy, Fourier transform infrared spectroscopy, photoluminescence spectra, UV-diffuse reflectance spectra and BET surface area measurement. The photocatalytic activity of prepared nanocomposite photocatalysts was studied by degradation of methyl orange dye under natural sunlight irradiation. S-doped ZnO-SnO2 was found to be more efficient than that of B,C-doped ZnO-SnO2 and bare ZnO-SnO2 nanocomposites. The photocatalytic activity of prepared photocatalysts follows trend as: S-doped ZnO-SnO2 > C-doped ZnO-SnO2 > B-doped ZnO-SnO2 > pure ZnO-SnO2. The enhanced activity of prepared photocatalysts could be attributed to the high specific surface area and small particle size.
Journal of the Turkish Chemical Society, Section A: Chemistry, 2017
In this study, undoped and Zn-doped SnO 2 nanoparticles in different concentrations were synthesized by flame spray pyrolysis (FSP) technique. The produced particles were post-annealed after FSP process at 600 °C in order to obtain a crystalline structure. The structural analysis of the produced powders was performed by X-Ray Diffraction (XRD) methods. The surface morphology of the nanoparticles was identified using scanning electron microscopy (SEM). In addition, photocatalytic degradation of aqueous methylene blue (MB) solutions were evaluated using undoped and Zn-doped SnO 2 nanoparticles under UV light illumination. Photocatalytic degradation of the MB solutions followed the pseudo-first-order-kinetics and the effect of the Zn doping amount on the photocatalytic reaction was investigated.
Sol–gel synthesis and photocatalytic activity of ZnO–SnO2 nanocomposites
Journal of Molecular Catalysis A: Chemical, 2014
ZnO-SnO 2 nanocomposites were synthesized by a facile sol-gel synthesis route and characterized through X-ray diffraction, BET specific surface area analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy. The photocatalytic activity of the samples was tested using the degradation of 4-nitrophenol under UV light as model reaction. The ZnO/SnO 2 molar ratio was varied in order to study its influence on the photoefficiency of the samples. The ZnO-SnO 2 nanocomposites showed higher photoactivity than the pure oxides and in particular the sample with ZnO/SnO 2 molar ratio equal to 1/0.05 resulted the best one among the tested powders. The high activity of the mixed samples was attributed to the presence of heterojunctions between the two oxides, which allows an improved charge separation of the photogenerated electron-hole pairs, due to the differences between the energy levels of the conduction and valence bands of ZnO and SnO 2 . Photovoltage measurements were performed to determine the energy band structure of the ZnO-SnO 2 heterojunction.
Comparative study on photocatalytic activity of ZnO prepared by different methods
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/authorsrights One of the best ways to reduce the contamination of water caused by the colored dyes used in the textile industries is photocatalytic treatment. The theme of the present investigation is photocatalytic degradation of organic dyes such as methylene blue and methyl orange in the presence of a catalyst like ZnO under UV light irradiation. The nanosized ZnO is prepared by three different methods namely sol–gel, precipitation and thermal decomposition method. The synthesized samples are calcinated at uniform temperature and are characterized by different techniques. Further, the efficiency of the catalyst and their photocatalytic mechanism are discussed in detail.
Preparation and photocatalytic activity of ZnO-SnO2, ZnO-ZnWO4 and SnO2-ZnO-ZnWO4 nanocomposites
2014
Fe 2 O 3 nanoparticles were grown on ZnO nanorods (NRs) to form ZnO/Fe 2 O 3 nanotube (NT) composites via photochemical deposition under ultraviolet light irradiation at a room temperature. Fe 3+ ions in the solution preferentially adhere to the metastable Zn-rich (0 0 0 1) polar surfaces in ZnO NRs, which leading to the formation of ZnO/Fe 2 O 3 NTs. ZnO/Fe 2 O 3 NT nanocomposites show a great improvement in photocatalytic characteristics compared with the bare ZnO NRs. It can be inferred that the enhanced photocatalytic performance of ZnO/Fe 2 O 3 is benefit from the synergistic effect of ZnO and Fe 2 O 3 semiconductors.
Journal of Photochemistry and Photobiology A: Chemistry, 2012
In the present work, the TiO 2 films doped with 0-0.6 at.% Gd were deposited by DC reactive magnetron sputtering and annealed in ambient air at 1273 K. The effects of Gd concentration on crystal phase formation and subsequent changes in optical and photocatalytic properties were determined. Photoluminescence (PL) spectra and their correlation with electronic structure were described. Structural studies revealed that Gd doping in the TiO 2 lattice led to a low anatase thermal stability relative to pure TiO 2 . A study based on a joint use of PL and XPS analyses showed the enhancement of oxygen vacancy concentration in the Gd-doped TiO 2 films. Photocatalytic activity was dependent on Gd doping and phase structure. A suitable amount of Gd doping (0.3-0.4 at.%) was favorable to the creation of abundant oxygen vacancies, so that the films could show an improvement in photocatalytic activity. After annealing, the photocatalytic activity of the films decreased with the increase of Gd content, due to the occurrence of the rutile phase.
Photocatalytic degradation of methyl orange by ZnO and SnO2 nanoparticles
Abstract In this work, we investigated synthesis of SnO2 and ZnO nanoparticles via sol gel method and their photocatalitic applications for removal of methyl orange pullutant in water. For this purpose ZnCl2 and SnCl2.2H2O were used as ZnO and SnO2 source respectively. The samples were characterized by X-ray diffraction (XRD) spectroscopy, XRD results revealed that the crystalline structure of SnO2 and ZnO nanoparticles were formed. Optical properties of samples measured using UV-Vis spectrophotometer. The experimental investigation of photocatalytic activity of SnO2 and ZnO nanoparticles for the degradation of methyl orange dye was found to be much higher in case of ZnO nanoparticles than SnO2 nanoparticles. weight fraction dependence study also show that the degradation of methyl orange dye increases with weight fraction. Keywords: SnO2 nanoparticles, ZnO nanoparticles, photocatalytic activities, methyl orange