期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 84, 期 -, 页码 69-79出版社
SCIENCE PRESS
DOI: 10.1016/j.jes.2019.04.012
关键词
Photocatalysis; Perfluorooctanoic acid; Oxygen vacancy; Microwave method; BiOCl
资金
- National Natural Science Foundation of China [21607028, 41425015, 41573086]
- Research Grant Council of Hong Kong Special Administrative Region (SAR) Government [GRF14100115]
- Science and Technology Project of Guangdong Province, China [2017A050506049]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01Z032]
- Innovation Team Project of Guangdong Provincial Department of Education [2017KCXTD012]
- Leading Scientific, Technical and Innovation Talents of Guangdong Special Support Program [2016TX03Z094]
There is an urgent need for developing cost-effective methods for the treatment of perfluorooctanoic acid (PFOA) due to its global emergence and potential risks. In this study, taking surface-defective BiOCl as an example, a strategy of surface oxygen vacancy modulation was used to promote the photocatalytic defluorination efficiency of PFOA under simulated sunlight irradiation. The defective BiOCl was fabricated by a fast microwave solvothermal method, which was found to induce more surface oxygen vacancies than conventional solvothermal and precipitation methods. As a result, the as-prepared BiOCl showed significantly enhanced defluorination efficiency, which was 2.7 and 33.8 times higher than that of BiOCl fabricated by conventional solvothermal and precipitation methods, respectively. Mechanistic studies indicated that the defluorination of PFOA follows a direct hole (h(+)) oxidation pathway with the aid of center dot OH, while the oxygen vacancies not only promote charge separation but also facilitate the intimate contact between the photocatalyst surface and PFOA by coordinating with its terminal carboxylate group in a bidentate or bridging mode. This work will provide a general strategy of oxygen vacancy modulation by microwave-assisted methods for efficient photocatalytic defluorination of PFOA in the environment using sunlight as the energy source. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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