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Photodegradation of perfluorooctanoic acid by 185 nm vacuum ultraviolet light
作者姓名:CHEN Jing  ZHANG Peng-yi  LIU Jian
作者单位:Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
基金项目:国家自然科学基金 , 教育部跨世纪优秀人才培养计划
摘    要:The photodegradation of persistent and bioaccumulative perftuorooctanoic 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.

关 键 词:全氟辛酸  真空紫外光  光降解  全氟羧酸
收稿时间:2006-05-10
修稿时间:2006-09-11

Photodegradation of perfluorooctanoic acid by 185 nm vacuum ultraviolet light
CHEN Jing,ZHANG Peng-yi,LIU Jian.Photodegradation of perfluorooctanoic acid by 185 nm vacuum ultraviolet light[J].Journal of Environmental Sciences,2007,19(4):387-390.
Authors:CHEN Jing  ZHANG Peng-yi and LIU Jian
Institution:Department of Environmental Science and Engineering,Tsinghua University,Beijing 100084,China
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.
Keywords:photodegradation  perfluorooctanoic acid  perfluorinated carboxylic acid  vacuum ultraviolet  ultraviolet light  vacuum  perfluorooctanoic acid  radical  form  unit  byproducts  mass balance  calculation  time  intermediates  measurement  carboxylic acids  fluoride  simulated  degradation  ratio  initial  However  slowly
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