| Radical-promoted formation of dibenzofuran during combined UV-chlorine treatment on mono-substituted diphenyl ether | |
Zhang, Xinyi; Wei, Dongbin ; Du, Yuguo
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| 2021-09-15 | |
| Source Publication | CHEMICAL ENGINEERING JOURNAL
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| ISSN | 1385-8947 |
| Volume | 420Pages:- |
| Abstract | Polybrominated diphenyl ethers (PBDEs) are a group of flame retardants which are frequently detected in the aquatic environment. PBDEs would convert into intermediates during some natural or artificial processes. A simple PBDEs congener, 2-bromodiphenyl ether (BDE-1), was targeted, and its transformation characteristics during combined UV-chlorine treatment were investigated in this study. It was found that BDE-1 could rapidly transform in combined UV-chlorine process, and HO center dot was the predominant radical that contributed to BDE-1 degradation in ultrapure water system. The formation of toxic dibenzofuran (DF) and 2-hydroxydibenzofuran (2-OH-DF) was significantly promoted in combined UV-chlorine treatment, whose total yield (2.78%) was 1.46 times to that in UV treatment alone. Radical scavenger tests revealed that enhanced formation of DF-type products in combined UV-chlorine treatment was attributed to radical reactions. Cl center dot or HO center dot generated from free available chlorine photolysis reacted with ortho-carbon radicals generated from BDE-1 photolysis, and produced intermediates 2-chlorodiphenyl ether (2-Cl-DE) or 2-phenoxyphenol (2-OH-DE), which underwent intramolecular elimination of HCl or H2O and formed DF and 2-OH-DF. The treatment with alkaline conditions, high chlorine doses and strong irradiation would be beneficial to the less formation of DF-type products. Besides, the matrix effects of ambient water also inhibited the formation of DF-type products. Overall, this work would provide an insight into the role of free radicals in dibenzofuran formation during combined UV-chlorine treatment on PBDEs and a scientific reference for optimizing operational parameters in the water treatment. |
| Department | 环境化学与生态毒理学国家重点实验室 |
| Keyword | Combined UV-chlorine treatment 2-Bromodiphenyl ether Dibenzofuran Free radicals |
| WOS Research Area | Engineering, Environmental ; Engineering, Chemical |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/45823 |
| Collection | 环境化学与生态毒理学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Zhang, Xinyi,Wei, Dongbin,Du, Yuguo. Radical-promoted formation of dibenzofuran during combined UV-chlorine treatment on mono-substituted diphenyl ether[J]. CHEMICAL ENGINEERING JOURNAL,2021,420:-. |
| APA | Zhang, Xinyi,Wei, Dongbin,&Du, Yuguo.(2021).Radical-promoted formation of dibenzofuran during combined UV-chlorine treatment on mono-substituted diphenyl ether.CHEMICAL ENGINEERING JOURNAL,420,-. |
| MLA | Zhang, Xinyi,et al."Radical-promoted formation of dibenzofuran during combined UV-chlorine treatment on mono-substituted diphenyl ether".CHEMICAL ENGINEERING JOURNAL 420(2021):-. |
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| Radical-promoted for（3100KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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