NDLI: Photodegradation of perfluorooctanoic acid by 185 nm vacuum ultraviolet light.

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Photodegradation of perfluorooctanoic acid by 185 nm vacuum ultraviolet light.

Content Provider	Semantic Scholar
Author	Chen, Jing Zhang, Peng-Yi Liu, Jian
Copyright Year	2007
Abstract	The photodegradation of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in water by 185 nm vacuum ultraviolet (VUV) light was examined to develop an effective technology to deal with PFOA pollution. PFOA degraded very slowly under irradiation of 254 nm UV light. However, 61.7% of initial PFOA was degraded by 185 nm VUV light within 2 h, and defluorination ratio reached 17.1%. Pseudo first-order-kinetics well simulated its degradation and defluorination. Besides, fluoride ion formed in water, 4 shorter-chain perfluorinated carboxylic acids (PFCAs), that is, perfluoroheptanoic acid, perfluorohexanoic acid, perfluoropentanoic acid, and perfluorobutanoic acid. These were identified as intermediates by LC-MS measurement. These PFCAs consecutively formed and further degraded with irradiation time. According to the mass balance calculation, no other byproducts were formed. It was proposed that PFCAs initially are decarboxylated by 185 nm light, and the radical thus formed reacts with water to form shorter-chain PFCA with one less CF2 unit.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.jesc.ac.cn/jesc_en/ch/reader/create_pdf.aspx?file_no=2007190402
PubMed reference number	17915698v1
Volume Number	19
Issue Number	4
Journal	Journal of environmental sciences
Language	English
Access Restriction	Open
Subject Keyword	ATP6AP1 gene Amino Acids, Branched-Chain Carboxylic Acids Fluorides Fluorine Immunoglobulin lambda-Chains Ions Pseudo brand of pseudoephedrine Salicylic Acid 20 MG/ML Medicated Liquid Soap Thioctic Acid Trans Fatty Acids Ultraviolet Rays perfluorobutyric acid perfluoroheptanoic acid perfluorohexanoic acid perfluorooctanoic acid
Content Type	Text
Resource Type	Article

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