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Photodegradation of aqueous methyl orange on MnTiO3 powder at different initial pH

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Abstract

The photodegradation of aqueous methyl orange on MnTiO3 powder was studied in this work. The effects of initial pH and H2O2 on the photodegradation of aqueous methyl orange were studied. Single-phase MnTiO3 powder was synthesized by a sol–gel method. X-ray diffraction analysis shows powders have a particle size of 43.7 nm and rhombohedral pyrophanite structure. The photocatalysis experiments revealed that the efficiency of decolorization of the aqueous methyl orange (1 × 10−5 M) on the MnTiO3 powder is very fast in sunlight. The rate of decolorization appears larger at initial pH 5 and 9 than at pH 7. H2O2 (2%) can remarkably accelerate the decolorization at low initial pH.

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Acknowledgments

The authors thank the Z. Miao, Northwest Institute for Non-Ferrous Metal Research, for his kind assistance with SEM measurement. The authors are also grateful for financial assistance from the specific scientific research projects of Shaanxi provincial education committee (09KJ348).

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Authors and Affiliations

  1. Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, 710021, Xi’an, Shaanxi, China

    H. Y. He

  2. College of Chemical Engineering, Shaanxi University of Science and Technology, 710021, Xi’an, Shaanxi, China

    W. X. Dong & G. H. Zhang

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

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He, H.Y., Dong, W.X. & Zhang, G.H. Photodegradation of aqueous methyl orange on MnTiO3 powder at different initial pH. Res Chem Intermed 36, 995–1001 (2010). https://doi.org/10.1007/s11164-010-0213-7

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  • DOI: https://doi.org/10.1007/s11164-010-0213-7

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