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https://doi.org/10.1021/acs.est.8b03558
Title: | Unveiling the Role of Defects on Oxygen Activation and Photodegradation of Organic Pollutants | Authors: | Xu, Mengjiao Chen, Yao Qin, Jiangtao Feng, Yawei Li, Wei CHEN WEI Zhu, Jian Li, Hexing Bian, Zhenfeng |
Keywords: | Science & Technology Technology Life Sciences & Biomedicine Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology HYDROGENATED TITANIUM-DIOXIDE ANATASE TIO2 PHOTOCATALYTIC DEGRADATION EFFICIENT PHOTOCATALYSTS THIN-FILMS BLACK TIO2 BAND-GAP NANOCRYSTALS ABSORPTION SURFACE |
Issue Date: | 4-Dec-2018 | Publisher: | AMER CHEMICAL SOC | Citation: | Xu, Mengjiao, Chen, Yao, Qin, Jiangtao, Feng, Yawei, Li, Wei, CHEN WEI, Zhu, Jian, Li, Hexing, Bian, Zhenfeng (2018-12-04). Unveiling the Role of Defects on Oxygen Activation and Photodegradation of Organic Pollutants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 52 (23) : 13879-13886. ScholarBank@NUS Repository. https://doi.org/10.1021/acs.est.8b03558 | Abstract: | © Copyright 2018 American Chemical Society. The status of defects of TiO 2 are of fundamental importance in determining its physicochemical properties. Here we report a simple chemical deposition method for controllable synthesis of defective anatase TiO 2 nanocrystals under various calcination atmospheres. XPS and ESR analysis reveals that both the oxygen vacancies (V O ) and the trivalent titanium (Ti 3+ ) defects exist in TiO 2 after N 2 treatment (N-TiO 2 ). Meanwhile, mainly V O defects can be obtained in TiO 2 with air calcination (A-TiO 2 ). 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 •O 2- species for A-TiO 2 , 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-TiO 2 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-TiO 2 exhibits higher separation efficiency of photogenerated carriers than that of N-TiO 2 , showing the critical role of V O with a suitable concentration in transferring photogenerated charges. | Source Title: | ENVIRONMENTAL SCIENCE & TECHNOLOGY | URI: | https://scholarbank.nus.edu.sg/handle/10635/169202 | ISSN: | 0013-936X 1520-5851 |
DOI: | 10.1021/acs.est.8b03558 |
Appears in Collections: | Staff Publications Elements |
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