期刊
CHEMOSPHERE
卷 180, 期 -, 页码 247-252出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.03.127
关键词
ZnO; PFOA; Photocatalytic; Ozonation; Mechanism
资金
- Innovation Project of Graduate School of South China Normal University
- National High Technology Research and Development Program of China [2013AA06A305]
- Science & Technology Office of Guangzhou [201607010276]
Zinc oxide (ZnO) nanorods were prepared by a directly pyrolysis method and employed as catalyst for perfluorooctanoic acid (PFOA) degradation. Comparative experiments were conducted to discuss the catalytic activity and flexibility of ZnO. After ZnO addition, the best PFOA degradation efficiency (70.5%) was achieved by ZnO/UV/O-3 system, only 9.5% by sole ozonation and 18.2% by UV254 light irradiation. PFOA degradation was sensitive with pH value and temperature. The better PFOA removal efficiency was achieved at acidic condition. A novel relationship was found among PFOA degradation efficiency with hydroxyl radicals and photo-generated holes. Hydroxyl radicals generated on the surfaces of ZnO nanorods played dominant roles in PFOA degradation. PFOA degradation was found to follow the photo Kolbe reaction mechanism. C-2-C-7 shorter-chain perfluorocarboxylic acids and fluoride ion were detected as main intermediates during PFOA degradation process. Based on the results, a proposal degradation pathway was raised. (C) 2017 Elsevier Ltd. All rights reserved.
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