期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 52, 期 23, 页码 13879-13886出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b03558
关键词
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资金
- NSF of China [21761142011, 21522703, 21876114, 21603036, 21377088]
- Shanghai Government [13SG44, 15520711300]
- Shanghai Rising-Star Program
- Singapore National Research Foundation [NRF2017NRF-NSFC001-007]
- Major State Basic Research Development Program [2016YFA0204000]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Ministry of Education of China [PCSIR-T_IRT_16R49]
- International Joint Laboratory on Resource Chemistry of China (IJLRC)
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 (V-O) and the trivalent titanium (Ti3+) defects exist in TiO2 after N-2 treatment (N-TiO2). Meanwhile, mainly V-O 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 center dot 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 V-O with a suitable concentration in transferring photogenerated charges.
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