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Photodegradation of methyl orange from wastewater on TiO2/SnS combined powders

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The photodegradation of an aqueous solution of methyl orange by the TiO2/SnS powders was studied in different ratios of SnS against TiO2. The effects of the initial pH value and light resource were investigated. The SnS extends the light absorption edge of the TiO2 to ~940 nm of the SnS (1.32 eV). The results indicated that the optimal SnS proportion for the maximum degradation efficiency increased in relation to a decrease in the initial pH in both sunlight and visible light, and decreased when changing from visible light to sunlight. The pure TiO2 powder had maximum efficiency in conditions of pH 9 and visible light irradiation or in conditions of pH 7 and sunlight irradiation. In visible light, the degradation efficiency on the powders containing the SnS was larger than that on the pure TiO2 powder in a range of pH 3–7. The maximum efficiency in visible light was found to be in conditions of pH 5 and TiO2:SnS = 3:2 and 2:3, beyond which the efficiency decreased. The efficiency was, overall, larger in sunlight than in visible light. The mechanism of the effects of pH and light resource was discussed in view of the surface charge of the catalysts.

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Acknowledgments

The authors thank Associate Prof. J. P. Wu for the XRD tests and Mr. Z. Miao, Northwest Institute for Nonferrous Metal Research, for the SEM tests. The authors are also thankful for the financial assistance of the specific scientific research projects of Shaanxi Provincial Education Committee (09KJ348).

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  1. Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology (SUST), **anyang, 710021, China

    H. Y. He, J. Lu, L. Y. Cao & M. Li

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  1. H. Y. He
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Correspondence to H. Y. He.

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He, H.Y., Lu, J., Cao, L.Y. et al. Photodegradation of methyl orange from wastewater on TiO2/SnS combined powders. Res Chem Intermed 38, 537–547 (2012). https://doi.org/10.1007/s11164-011-0369-9

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  • DOI: https://doi.org/10.1007/s11164-011-0369-9

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