Distinct photoproducts of hydroxylated polybromodiphenyl ethers from different photodegradation pathways: a case study of 2'-HO-BDE-68.
Distinct photoproducts of hydroxylated polybromodiphenyl ethers from different photodegradation pathways: a case study of 2'-HO-BDE-68.
复制标题
来自不同光降解途径的羟基化多溴二苯醚的独特光产物：2'-HO-BDE-68 的案例研究。
DOI：
10.1039/c4em00395k
复制
发表时间：
2015-02
期刊：
影响因子：
--
通讯作者：
HongBin Xie
中科院分区：
文献类型：
--
作者：
Jingwen Chen;Hongxia Zhao;Xingbao Wang;HongBin Xie
羟基化多卤代二苯醚（HO-PXDE）是一种新兴的水生污染物。先前的研究表明HO-PXDE可以光生二恶英和酚类化合物。然而，目前还不清楚哪些光化学途径负责各种光产物。本研究以2 '-HO-2，3'，4，5 '-四溴二苯醚（2'-HO-BDE-68）为研究对象，研究了（1）O2和光敏化产生的stecOH引发的直接光解和光氧化反应。结果表明，1，3，8-三溴二苯并-对-二恶英只能在直接光解过程中生成。通过质谱分析，确认了直接和间接光降解产生的四种二羟基化多溴二苯醚。其中，二HO-三溴二苯醚（di-HO-TBDE）是直接光解的主要产物。最有可能的是，二-HO-TBDE是2 '，5'-HO-2，3 '，4-三溴二苯醚，正如密度泛函理论计算所表明的那样。醚键断裂是导致2，4-二溴苯酚作为主要产物的直接光解和光氧化反应的主要途径。报道了产物的产率，其与反应时间无关，并且可用于比较不同HO-PXDE光生给定产物的能力。本研究表明，为了准确的生态风险评估HO-PXDEs，他们的不同的光降解途径，可能会导致不同的光产物应予以考虑。
Hydroxylated polyhalodiphenyl ethers (HO-PXDEs) are emerging aquatic pollutants. Previous studies have shown that HO-PXDEs can photogenerate dioxins and phenolic compounds. However, it is unclear which photochemical pathways are responsible for the various photoproducts. This study investigates the direct photolysis and photooxidation initiated by (1)O2 and ˙OH that can be formed by photosensitization, taking 2'-HO-2,3',4,5'-tetrabromodiphenyl ether (2'-HO-BDE-68) as a case study. The results show that 1,3,8-tribromodibenzo-p-dioxin can only be produced during direct photolysis. By mass spectrum analysis, four dihydroxylated polybromodiphenyl ethers, generated from both direct and indirect photodegradation were confirmed. Among them, di-HO-tribromodiphenyl ether (di-HO-TBDE) was the main product generated from direct photohydrolysis. Most probably, the di-HO-TBDE is 2',5'-HO-2,3',4-tribromodiphenyl ether, as was suggested by density functional theory calculations. Ether bond cleavage is a dominant pathway for the direct photolysis and photooxidation reactions leading to 2,4-dibromophenol as the dominant product. The yields of the products, which are irrespective of reaction time and can be employed to compare the ability of different HO-PXDEs to photogenerate a given product, were reported. This study indicates that for accurate ecological risk assessment of HO-PXDEs, their different photodegradation pathways that may lead to different photoproducts should be considered.
登录
查看更多内容
影响因子：
4.1
作者：
Buth, Jeffrey M.;Grandbois, Matthew;Arnold, William A.
通讯作者：
Arnold, William A.
DOI：
10.1016/s1010-6030(03)00103-5
发表时间：
2003-05-30
影响因子：
4.3
作者：
Latch, DE;Packer, JL;McNeill, K
通讯作者：
McNeill, K
影响因子：
11.4
作者：
P. Maddigapu;M. Minella;D. Vione;V. Maurino;C. Minero
通讯作者：
P. Maddigapu;M. Minella;D. Vione;V. Maurino;C. Minero
DOI：
10.1016/j.jphotochem.2007.04.024
发表时间：
2007-09
影响因子：
4.3
作者：
P. Wong‐Wah‐Chung;S. Rafqah;G. Voyard;M. Sarakha
通讯作者：
P. Wong‐Wah‐Chung;S. Rafqah;G. Voyard;M. Sarakha
影响因子：
2.8
作者：
Marsh, G;Stenutz, R;Bergman, A
通讯作者：
Bergman, A