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Enhanced photocatalytic reduction of Cr(VI) by manganese-doped anatase titanium dioxide

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Abstract

Nano-TiO2 is frequently used as an optimal photocatalyst, since it is nontoxic, low cost, and environmentally friendly, especially for its photocatalytic oxidation action. However, its photocatalytic reducing action has not been widely researched. In this study, TiO2 doped with different concentrations of manganese was prepared by the sol–gel method and characterized using different techniques to analyze the surface structure, phase composition, and surface elements of the different materials. To investigate the photocatalytic activity, Mn–TiO2 was used for photocatalytic reduction of Cr(VI). Moreover, various organic pollutants were added to determine whether they enhanced the photocatalytic reduction of Cr(VI). The experiments indicated that the presence of Mn in TiO2 could enhance its photocatalytic reduction action, especially at 0.02 % molar ratio. Manganese ions doped in TiO2 behaved as electron accumulation sites. In addition, pH value, and photocatalyst dosage were investigated to analyze their effects on the photocatalytic reduction action. The results show that lower pH value improved the efficiency of photocatalytic reduction; there were no significant changes in the photocatalytic reduction rate with dosage above 1.0 g/L. In the presence of different electron donors (organic pollutants as hole scavengers), the photocatalytic reduction of Cr(VI) was generally improved. In short, manganese-doped TiO2 exhibited improved photocatalytic reduction activity, especially in cooperation with various organics.

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Acknowledgments

Financial support for this research was provided by the Key Natural Science Foundation, transformation mechanism and control principle of nitrogenous pollutant in the urban water supply system (Grant No. 51438006), the Priority Academic Program Development of Jiangsu Higher Education Institutions (RAPD), the Scientific Research Starting Foundation for Returned Overseas Chinese Scholars, Ministry of Education, China (grant no. 1061-51200312), the National Science Fund for Distinguished Young Scholars (grant no. 50925932), Water Conservancy Research Funds, JiangSu (1061-51146012), and National Major Equipment Development Special Funds (2014YQ060773).

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Authors and Affiliations

  1. Key Laboratory for Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China

    Dong-liang Ji, Jianzhong Zhu, Min Ji & Yang Leng

  2. Yancheng Environmental Protection Bureau, Yancheng, 224001, China

    Dong-liang Ji

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  1. Dong-liang Ji
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  2. Jianzhong Zhu
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  3. Min Ji
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  4. Yang Leng
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Correspondence to Jianzhong Zhu.

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Ji, Dl., Zhu, J., Ji, M. et al. Enhanced photocatalytic reduction of Cr(VI) by manganese-doped anatase titanium dioxide. Res Chem Intermed 42, 5413–5429 (2016). https://doi.org/10.1007/s11164-015-2375-9

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  • DOI: https://doi.org/10.1007/s11164-015-2375-9

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