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	Photodegradation of perfluorooctanoic acid in water under irradiation of 254 nm and 185 nm light by use of persulfate
	Chen, J. ; Zhang, P.
	2010-05-10 ; 2010-05-10
会议名称	WATER SCIENCE AND TECHNOLOGY ; 5th World Water Congress of the International-Water-Association ; Beijing, PEOPLES R CHINA ; Web of Science
关键词	perfluorooctanoic acid persulfate photodegradation UV SOLID-PHASE EXTRACTION PHOTOCHEMICAL DEGRADATION EFFICIENT DECOMPOSITION TEMPORAL TRENDS SULFONATE TOXICITY PERFLUOROCHEMICALS DERIVATIVES SUBSTANCES EXPOSURE Engineering, Environmental Environmental Sciences Water Resources
中文摘要	The photodegradation of perfluorooctanoic acid (PFOA) in water using two types of low-pressure mercury lamps, one emitting 254 nm and the other emitting 254 nm and 185 nm, by use of persulfate (K2S2O8) as an oxidant was investigated. PFOA was significantly decomposed under irradiation of 185 nm light, while it was very slow and negligible under 254 nm light irradiation. This was due to its strong absorption of PFOA from deep UV-region to 220 nm and a weak absorption from 220-460 nm. The addition of K2S2O8 led to efficient PFOA decomposition and defluorination no matter what light irradiation. Sulfate radical anion (SO4-), generated by photolysis of K2S2O8, initiated the oxidation of PFOA. Under irradiation of 185 nm light, PFOA was jointly decomposed through 185 nm light photolysis and initiation of sulfato radical. However, under irradiation of 254 nm light, PFOA decomposition was only initiated by sulfate radical. PFOA decomposed and defluorinated much faster under oxygen atmosphere than under nitrogen atmosphere, which suggested that oxygen molecules played an important role in PFOA decomposition.
会议录出版者	I W A PUBLISHING ; LONDON ; ALLIANCE HOUSE, 12 CAXTON ST, LONDON SW1H0QS, ENGLAND
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/18912]
专题	清华大学
推荐引用方式 GB/T 7714	Chen, J.,Zhang, P.. Photodegradation of perfluorooctanoic acid in water under irradiation of 254 nm and 185 nm light by use of persulfate[C]. 见:WATER SCIENCE AND TECHNOLOGY, 5th World Water Congress of the International-Water-Association, Beijing, PEOPLES R CHINA, Web of Science.

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