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Novel BiOCl/BiCl3Br–CTA Heterostructure Photocatalyst with Abundant Oxygen Vacancies and a Superoleophilic Surface for Promoting Selective Oxidation of Toluene

  • Ganhua Qiu
    Ganhua Qiu
    Department of Chemistry, College of Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
    More by Ganhua Qiu
  • Ting Wang
    Ting Wang
    Department of Chemistry, College of Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
    More by Ting Wang
  • Xiaoli Li
    Xiaoli Li
    Department of Chemistry, College of Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
    More by Xiaoli Li
  • Xueqin Tao
    Xueqin Tao
    Department of Chemistry, College of Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
    More by Xueqin Tao
  • , and 
  • Benxia Li*
    Benxia Li
    Department of Chemistry, College of Science, Zhejiang Sci-Tech University, Hangzhou 310018, China
    *Email: [email protected]
    More by Benxia Li
Cite this: Ind. Eng. Chem. Res. 2020, 59, 25, 11517–11526
Publication Date (Web):June 3, 2020
https://doi.org/10.1021/acs.iecr.0c01796
Copyright © 2020 American Chemical Society

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    Abstract

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    A heterostructure photocatalyst consisting of BiOCl nanoplates and a bismuth-organic hybrid layer (alias BiCl3Br–CTA) was synthesized through a one-step solvothermal process. The BiOCl/BiCl3Br–CTA heterostructures exhibited broad light absorption and enhanced electron–hole separation efficiency. Moreover, the abundant oxygen vacancies (OVs) and superoleophilic surface endowed the photocatalyst with high abilities for adsorption and activation of O2 and toluene. Therefore, the BiOCl/BiCl3Br–CTA photocatalyst showed excellent activities for the C(sp3)–H bond oxidation of toluene under full-spectrum irradiation and visible light of simulated sunlight, which are 6.8-fold and 237.8-fold, respectively, than those of BiOCl nanoplates. The photocatalytic mechanism was revealed by a series of controlled experiments and in situ ESR detections. The selective oxidation of toluene was promoted by the synergy between the electrons in BiOCl for activating O2 and the holes in the BiCl3Br–CTA layer for activating the C(sp3)–H bonds. This research demonstrates an effective strategy to construct high-activity photocatalysts for challenging organic transformations.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.iecr.0c01796.

    • XRD patterns, XPS survey spectra, SEM images, ESR spectrum; element analysis of N, C, H, Bi, Cl, and Br in the BiOCl/BiCl3Br–CTA sample; fitting parameters from time-resolved PL decay profiles of BiOCl and BiOCl/BiCl3Br–CTA; and photocatalytic selective oxidation of toluene under varied conditions (PDF)

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