The formation of PBDFs from the ortho-disubstituted phenol precursors: A comprehensive theoretical study on the PBDD/Fs formation from 2,4,6-tribromophenol
文献类型：期刊论文
| 作者 | Chang, Jiamin; Pan, Wenxiao; Liu, Xian; Xue, Qiao; Fu, Jianjie ; Zhang, Aiqian
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2020-04-15 |
| 卷号 | 713页码:1-6 |
| 关键词 | PBDD/TS Formation mechanism Ortho-disubstituted phenol precursor Density functional theory study |
| ISSN号 | 0048-9697 |
| 英文摘要 | Bromophenols are known as direct precursors of the notorious polybrominated dibenzo-p-dioxin/dibenzofurans (PBDD/Fs). There is a long-held viewpoint that only the more toxic dioxin-type products could be formed from the ortho-disubstituted phenols, totally contrary to the experimental observations that both PBDDs and PBDF5 are generated. To tackle the issue, the gaseous formation mechanism of PBDD/Fs from 2,4,6-tribromophenol (TBP), a typical ortho-disubstituted phenol, was investigated in this study. Firstly, the reactions between TBP and the active H radical produce three key radical species including the bromophenoxyl radical, the substituted phenyl radical and phenoxyl diradical. The self- and cross-combinations of these radical species and TBP yield not only the dioxin-type products 1,3,6,8-TeBDD and 1,3,7,9-TeBDD, but also the brominated dibenzofurans 1,3,6,8-TeBDF and 2,4,6,8-TeBDF. Notably, the reactions involving the phenyl C sites in the substituted phenyl and phenoxyl diradicals are demonstrated to be both thermodynamically and kinetically more favorable than those involving the bromophenoxyl radical and the TBP molecule. Most importantly, the findings of the present work are of great importance as it provides feasible pathways to form less toxic dibenzofuran-type products from the oriho-disubstituted phenols. These results will improve the understanding of the PBDD/Fs formation mechanism from phenol precursors. (C) 2020 Elsevier B.V. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/44825]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Chang, Jiamin,Pan, Wenxiao,Liu, Xian,et al. The formation of PBDFs from the ortho-disubstituted phenol precursors: A comprehensive theoretical study on the PBDD/Fs formation from 2,4,6-tribromophenol[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,713:1-6. |
| APA | Chang, Jiamin,Pan, Wenxiao,Liu, Xian,Xue, Qiao,Fu, Jianjie,&Zhang, Aiqian.(2020).The formation of PBDFs from the ortho-disubstituted phenol precursors: A comprehensive theoretical study on the PBDD/Fs formation from 2,4,6-tribromophenol.SCIENCE OF THE TOTAL ENVIRONMENT,713,1-6. |
| MLA | Chang, Jiamin,et al."The formation of PBDFs from the ortho-disubstituted phenol precursors: A comprehensive theoretical study on the PBDD/Fs formation from 2,4,6-tribromophenol".SCIENCE OF THE TOTAL ENVIRONMENT 713(2020):1-6. |
入库方式： OAI收割
来源：生态环境研究中心
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