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Photodegradation of organic dyes via competitive direct reduction/indirect oxidation on InSnS2 under visible light

  • Materials (Organic, Inorganic, Electronic, Thin Films)
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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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Authors and Affiliations

  1. Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Korea

    Sungmook Park, Woocheol Kim & Younghun Kim

Authors
  1. Sungmook Park
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  2. Woocheol Kim
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  3. Younghun Kim
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Correspondence to Younghun Kim.

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Park, S., Kim, W. & Kim, Y. Photodegradation of organic dyes via competitive direct reduction/indirect oxidation on InSnS2 under visible light. Korean J. Chem. Eng. 34, 1500–1503 (2017). https://doi.org/10.1007/s11814-017-0034-0

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  • DOI: https://doi.org/10.1007/s11814-017-0034-0

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