Photodegradation of Hexafluoropropylene Oxide Trimer Acid under UV Irradiation

作     者：Chen Li Na Mi Zhanghao Chen Cheng Gu Chen Li;Na Mi;Zhanghao Chen;Cheng Gu

作者机构：State Key Laboratory of Pollution Control and Resource ReuseSchool of the EnvironmentNanjing UniversityNanjing 210023China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2020年第32卷第11期

页      面：132-140页

核心收录：

学科分类：082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 

基　　金：funded by the Chinese Academy of Engineering Consulting Project(No.2019-XZ-24) the National Key Re-search and Development Plans of Special Project for Site Soil(No.2018YFC1801002) 

主　　题：HFPO-TA Photo-reductive Hydrated electrons Active hydrogen atoms Degradation pathway 

摘      要：As a novel alternative to traditional perfluoroalkyl substances(PFASs),including perfluorooctanoic acid(PFOA)and perfluorooctane sulfonate(PFOS),hexafluoroproplyene oxide trimer acid(HFPO-TA)has been detected worldwide in surface ***,recent researches have demonstrated that HFPO-TA has stronger bioaccumulation potential and higher hepatotoxicity than *** treat these contaminants *** and PFOS,some photochemical techniques by adding exogenous substances had been ***,there is still no report for the behavior of HFPO-TA itself under direct UV *** current study investigated the photo-transformation of HFPO-TA under UV irradiation in aqueous *** 72 hr photoreaction,75%degradation ratio and 25%defluorination ratio were achieved under ambient *** active species,i.e.,hydrated electrons and active hydrogen atoms,generated from water splitting played dominant roles in degradation of HFPO-TA,which was confirmed by different effects of reaction atmospheres and quenching experiments.A possible degradation pathway was proposed based on the products identification and theoretical *** general,HFPO-TA would be transformed into shorter-chain PFASs,including hexafluoropropylene oxide dimer acid(HFPODA),perfluoropropionic acid(PFA)and trifluoroacetate(TFA).This research provides basic information for HFPO-TA photodegradation process and is essential to develop novel remediation techniques for HFPO-TA and other alternatives with similar structures.