文献类型：期刊文献

英文题名：Aqueous photodecomposition of the emerging brominated flame retardant tetrabromobisphenol S (TBBPS)

作者：Xu, Haiyan[1];Li, Yueyue[1];Lu, Jiaxin[1];Lu, Junhe[1];Zhou, Lei[2];Chovelon, Jean-Marc[3];Ji, Yuefei[1]

机构：[1]Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[3]Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, IRCELYON, F-69626 Villeurbanne, France

年份：2021

卷号：271

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20210109726482);WOS:【SCI-EXPANDED(收录号:WOS:000614114100100)】；

基金：The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Grant No. 22076080 and 21876085). The content of the paper does not necessarily represent the views of the funding agencies.

语种：英文

外文关键词：Brominated flame retardant; Photolysis; Photodegradation; Tetrabromobisphenol S; Debromination

摘要：As an emerging brominated flame retardant (BFR), tetrabromobisphenol S (TBBPS) has been frequently detected in the environmental media and organisms. Knowledges on the transformation and fate of TBBPS in both environment and engineering systems are essential to its ecological risk assessment. Herein, we reported the photochemical decomposition of TBBPS in aqueous solution upon 254 nm ultraviolet irradiation (UV254). Results show that TBBPS was highly photoreactive, most likely due to the presence of four ortho-bromine substituents. The molar absorption coefficient and quantum yield of TBBPS were found to be pH-dependent, with the monoanionic form being most photoreactive. A series of photoproducts were identified by solid phase extraction (SPE) combined with liquid chromatography-electrospray ionization-triple quadrupole mass spectrometry (LC-ESI(+)-MS/MS. The photolysis of TBBPS likely proceeded through photonucleophilic substitution, photoreductive debromination, and beta-scission reactions. A ketocarbene, possibly derived from the lower lying excited triplet state, was proposed to be involved in the photolysis of TBBPS. Ion chromatography analysis revealed that debromination occurred quickly, and the yield of bromide (Br-) approached 100% after 90 min irradiation. The presence of SRNOM and MRNOM inhibited the photodegradation rate of TBBPS, which is likely due to the light-screening and physical quenching effects of natural organic matter (NOM). Our results reveal that photolysis is an important process for the attenuation of TBBPS in aquatic system; however, naturally occurring species such as NOM can appreciably retard the decay of TBBPS. (C) 2020 Elsevier Ltd. All rights reserved.