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Solid-phase Synthesis of Visible-light-driven BiVO4 Photocatalyst and Photocatalytic Reduction of Aqueous Cr(VI)

1School of Chemistry and Chemical Engineering, Xuzhou University of Technology, 221111, Xuzhou, China

2School of Mechanical & Electrical Engineering, Xuzhou University of Technology, 221111, Xuzhou, China

3School of Chemical Engineering and Technology, China University of Mining and Technology, 221111, Xuzhou, China

Received: 9 Sep 2018; Revised: 16 Jan 2019; Accepted: 23 Jan 2019; Available online: 30 Apr 2019; Published: 1 Aug 2019.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2019 by Authors, Published by BCREC Group under

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This communication reports a pioneering study on the synthesis of BiVO4 and photocatalytic reduction of Cr(VI)-polluted wastewaters. Monoclinic phase BiVO4 micron-crystals with adjustable morphology were synthesized via a solid-phase route. The structures, morphology, optical properties of the BiVO4 micron-crystals were characterized by X-ray diffraction, field emission scanning electron microscopy, UV-vis diffuse reflectance spectra, Fourier transform infrared spectroscopy spectra, and photocurrent measurements. Besides, their photocatalytic properties were tested for the reduction of aqueous Cr(VI) under visible light (l > 420 nm) irradiation. The photocatalytic tests showed that the photocatalytic activities of BiVO4 powders in aqueous Cr(VI) depended on the dark adsorption amount for Cr(VI) and number of photogenerated carriers. BiVO4-(c) exhibited the highest photocatalytic reduction efficiency that attributed to highest separation and transfer efficiency of photogenerated electrons and holes. Besides, effects of photocatalytic experiment parameters (including dosage of photocatalyst and coexistent anions and cations) on the Cr(VI) removal rate by BiVO4-(c) were also investigated, and •OH play an important role in the BiVO4 photocatalytic reduction Cr(VI). 

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Keywords: Semiconductors; Photocatalysis; Visible-light Driven; Hexavalent Chromium Reduction
Funding: Natural Science Foundation of Jiangsu Province; Science and Technology Project of Xuzhou ; Major Program of Natural Science Foundation of the Jiangsu Higher Education Institutions of China; Innovation

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