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Visible-Light-Induced AgI/Bi7O9I3 Composites with Enhanced Photocatalytic Activity

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Abstract

Highly efficient visible-light-driven AgI/Bi7O9I3 hybrid photocatalysts with different weight ratios of AgI were prepared via solvothermal-ion exchange method. Under visible light irradiation (>420 nm), the AgI/Bi7O9I3 photocatalysts displayed the higher photocatalytic activity than pure AgI and Bi7O9I3 for the degradation of bisphenol A (BPA). Among the hybrids, AgI/Bi7O9I3 with 33 wt% of AgI exhibited the highest photocatalytic activity for the degradation of BPA. X-ray photoelectron spectroscopy results revealed that the formation of metallic Ag0 from the hybrids was not observed during the photocatalytic reaction. Further, the photocatalytic activity of AgI/Bi7O9I3 maintained after five recycling runs. The quenching effects of different scavengers displayed that the reactive O2 ·− and h+ play the major role in the BPA degradation. The excellent photocatalytic activity of the AgI/Bi7O9I3 composites were closely related to the fast transfer and efficient separation of electron–hole pairs at the interfaces of the two semiconductors derived from the matching band positions between AgI and Bi7O9I3.

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Acknowledgements

This work was partly supported by a Grant-in-Aid for Scientific Research (C) No. 15K05642 from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and Iketani Science & Technology Foundation (No. 0271055-A). The authors would like to thank T. Sasaki, Mie University, for technical assistance with the experiments.

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Authors and Affiliations

  1. Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie, 514-8507, Japan

    Ikki Tateishi, Hideyuki Katsumata & Satoshi Kaneco

  2. Mie Global Environment Center for Education & Research, Mie University, Tsu, Mie, 514-8507, Japan

    Tohru Suzuki

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  1. Ikki Tateishi
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  2. Hideyuki Katsumata
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  3. Tohru Suzuki
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  4. Satoshi Kaneco
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Correspondence to Hideyuki Katsumata.

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Tateishi, I., Katsumata, H., Suzuki, T. et al. Visible-Light-Induced AgI/Bi7O9I3 Composites with Enhanced Photocatalytic Activity. Catal Lett 147, 1503–1509 (2017). https://doi.org/10.1007/s10562-017-2059-8

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  • DOI: https://doi.org/10.1007/s10562-017-2059-8

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