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Received December 25, 2016
Accepted February 6, 2017
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Photodegradation of organic dyes via competitive direct reduction/indirect oxidation on InSnS2 under visible light
Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul 01899, Korea
korea1@kw.ac.kr
Korean Journal of Chemical Engineering, May 2017, 34(5), 1500-1503(4), 10.1007/s11814-017-0034-0
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Abstract
A visible-light-responsive photocatalyst, SnS2, was prepared by a rapid microwave-assisted method. This photocatalyst showed a narrow band gap (~2.0 eV) and a broad-spectrum response in the range of 400-800 nm. To enhance its photocatalytic activity, the surface of SnS2 was modified with indium-doping and loading of a noble metal. The photocatalytic activity of SnS2, InSnS2, and Pt/InSnS2 was evaluated by photodegradation of methyl orange (MO) and rhodamine B (RhB) under visible light. While direct reduction via a photoelectron was the major reaction in the degradation of MO, indirect oxidation (deethylation) via reactive oxygen species (·OH and ·O2-) in the degradation of RhB was accompanied subsequently with direct reduction (cycloreversion). Therefore, photocatalytic efficiency and the mechanism for photodegradation of organic dyes depended on the types of organic dyes.
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