Unveiling the Role of Defects on Oxygen Activation and Photodegradation of Organic Pollutants

  • Mengjiao Xu
    Mengjiao Xu
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    More by Mengjiao Xu
  • Yao Chen
    Yao Chen
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    More by Yao Chen
  • Jiangtao Qin
    Jiangtao Qin
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    More by Jiangtao Qin
  • Yawei Feng
    Yawei Feng
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    More by Yawei Feng
  • Wei Li
    Wei Li
    Department of Chemistry, Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials and iChEM, Fudan University, Shanghai 200433, P. R. China
    More by Wei Li
  • Wei Chen
    Wei Chen
    Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
    More by Wei Chen
  • Jian Zhu
    Jian Zhu
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    More by Jian Zhu
  • Hexing Li*
    Hexing Li
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    *E-mail: [email protected]
    More by Hexing Li
  • , and 
  • Zhenfeng Bian*
    Zhenfeng Bian
    The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. China
    *E-mail: [email protected]
Cite this: Environ. Sci. Technol. 2018, 52, 23, 13879–13886
Publication Date (Web):November 14, 2018
Copyright © 2018 American Chemical Society
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Supporting Info (1)»


The status of defects of TiO2 are of fundamental importance in determining its physicochemical properties. Here we report a simple chemical deposition method for controllable synthesis of defective anatase TiO2 nanocrystals under various calcination atmospheres. XPS and ESR analysis reveals that both the oxygen vacancies (VO) and the trivalent titanium (Ti3+) defects exist in TiO2 after N2 treatment (N-TiO2). Meanwhile, mainly VO defects can be obtained in TiO2 with air calcination (A-TiO2). ESR spectra for reactive oxygen species determination, clearly show that the visible light catalytic activity is mainly caused by the efficient activation of oxygen molecules to •O2– species for A-TiO2, which play an important role in hindering the accumulation of intermediates during p-chlorophenol (4-CP) photodegradation process. However, the oxygen molecules cannot be activated for N-TiO2 even with superior visible light absorption and thus the photogenerated electron are reductant, which participated in the transformation of BQ to HQ via electron shuttle mechanism. Moreover, A-TiO2 exhibits higher separation efficiency of photogenerated carriers than that of N-TiO2, showing the critical role of VO with a suitable concentration in transferring photogenerated charges.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b03558.

  • TEM images, N2 adsorption–desorption isotherms, thermal analysis profiles of precursor, XPS spectra, UV–vis absorbance spectra, optical reflectance spectra, proposed sample lattice structure, photocatalytic performance, photocurrent spectra, photoluminescence spectra, SPV spectra of A-TiO2 and N-TiO2, and their structural parameters (PDF)

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