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Ultrafine Bi3TaO7 Nanodot-Decorated V, N Codoped TiO2 Nanoblocks for Visible-Light Photocatalytic Activity: Interfacial Effect and Mechanism Insight

  • Chengzhang Zhu
    Chengzhang Zhu
    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
  • Yuting Wang
    Yuting Wang
    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
    More by Yuting Wang
  • Zhifeng Jiang
    Zhifeng Jiang
    School of Life Sciences, The Chinese University of Hong Kong, Shatin, New Territories 999077, PR China
    Institute for Energy Research, Jiangsu University, Zhenjiang 212013, PR China
  • Annai Liu
    Annai Liu
    Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, PR China
    More by Annai Liu
  • Yu Pu
    Yu Pu
    Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, PR China
    More by Yu Pu
  • Qiming Xian*
    Qiming Xian
    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
    *E-mail: [email protected]. Phone/Fax: +86 25 89680259 (Q.X.).
    More by Qiming Xian
  • Weixin Zou*
    Weixin Zou
    Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, PR China
    *E-mail: [email protected] (W.Z.).
    More by Weixin Zou
  • , and 
  • Cheng Sun
    Cheng Sun
    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
    More by Cheng Sun
Cite this: ACS Appl. Mater. Interfaces 2019, 11, 13, 13011–13021
Publication Date (Web):March 15, 2019
https://doi.org/10.1021/acsami.9b00903
Copyright © 2019 American Chemical Society
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Abstract

Bi3TaO7 is a potential photocatalyst because of its high chemical stability, defective fluorite-type structure, and superior mobility of photoinduced holes. However, few studies have focused on the interfacial effects of Bi3TaO7-based photocatalysts. In this work, 0D Bi3TaO7 nanodot-hybridized 3D V and N codoped TiO2 nanoblock (B/VNT) composites were first synthesized for the photocatalytic removal of oxytetracycline hydrochloride, 2,4,6-trichlorophenol, and tetrabromobisphenol A. The fabricated B/VNT had a photocatalytic performance superior to that of pristine components, and probable degradation pathways were proposed according to the primary intermediates identified by a gas chromatography–mass spectrometer. Interestingly, on B/VNT, the transfer of interfacial electrons was observed from V/N–TiO2 to Bi3TaO7, and the formed built-in electronic field led to a direct Z-scheme structure, rather than type II, as confirmed by the generated OH and O2 radicals and band structures from the density functional theory calculation. Therefore, the strong interfacial electronic interaction on the B/VNT was significant, which drove faster photogenerated charge transfer, more visible-light adsorption, and active OH and O2 generation, thus improving the photocatalytic activity.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.9b00903.

  • High-resolution XPS spectra of V 2p, N 1s region; XPS survey spectra; SEM images of 10% B/VNT (element-sensitive mapping images); BET; UV–vis DRS; PL; time-resolved fluorescence decay; transient photocurrent response and ESI Nyquist plots of samples; XRD spectra of 10% B/VNT heterojunction after photocatalysis; pseudo-first-order constants (kapp) of different photocatalysts; comparison of the photodegradation activity; and the results of surface area, kapp, and rate constant normalized with the surface areas (k′) (PDF)

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