Photolytic degradation of decabromodiphenyl ethane (DBDPE).
Photolytic degradation of decabromodiphenyl ethane (DBDPE).
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DOI：
10.1016/j.chemosphere.2012.05.006
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发表时间：
2012-10
期刊：
影响因子：
8.8
通讯作者：
Jing Wang;Shejun Chen;Xin Nie;Mi Tian;Xiaojun Luo;T. An;B. Mai
中科院分区：
文献类型：
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作者：
Jing Wang;Shejun Chen;Xin Nie;Mi Tian;Xiaojun Luo;T. An;B. Mai
研究了十溴二苯醚阻燃剂十溴二苯乙烷（DBDPE）在正己烷、四氢呋喃、甲醇/水、腐植酸/水、硅胶等多种基质下紫外光照射和自然光下正己烷的光解降解。在辐照时间（<320min）内，DBDPE在所有基质中均发生光解降解。降解实验表明，不同基质的反应速率不同，半衰期t1/2依次为四氢呋喃（t1/2=6.0min）、bb0正己烷（t1/2=16.6min）、bb1腐殖酸/水（30<t1/2<60）、bb2硅胶（t1/2= 75.1 min）、bb3甲醇/水（t1/2>240min）。在四氢呋喃、正己烷和硅胶基体中的反应可以用准一级动力学来描述。基质对DBDPE降解产物的分布影响不大。发现了一些脱溴中间体。降解包括在辐照时间内初始形成nona- bdpe和随后将这些同源物分解为低溴化同源物（八溴和七溴- bdpe）。据我们所知，目前的工作是第一次尝试研究DBDPE降解过程中的光解降解动力学和中间体的鉴定以及降解机制。DBDPE在自然环境中的光解降解规律有待进一步研究。
The photolytic degradation of decabromodiphenyl ethane (DBDPE), an alternative flame retardant to decabromodiphenyl ether, was investigated in a variety of matrixes (n-hexane, tetrahydrofuran, methanol/water, humic acid/water, and silica gel) by irradiation under ultraviolet light and in n-hexane under natural light. Photolytic degradation of DBDPE occurs in all the matrixes investigated within the irradiation period (<320min). The degradation experiments showed varied reaction rates, dependent on the matrixes, with increasing half-lives (t1/2) in the order of tetrahydrofuran (t1/2=6.0min)>n-hexane (t1/2=16.6min)>humic acid/water (30<t1/2<60)>silica gel (t1/2=75.9min)>methanol/water (t1/2>240min). The reaction in tetrahydrofuran, n-hexane, and silica gel matrixes can be described by the pseudo first order kinetics. Nevertheless, the matrixes have little effect on the degradation product distributions of DBDPE. A numbers of debrominated intermediates were identified. The degradation involves the initial formation of nona-BDPEs and the subsequent decomposition of these congeners to lower brominated congeners (octa- and hepta-BDPEs) within the irradiation time. To our knowledge, the present work is the first attempt to investigate the photolytic degradation kinetics and the identification of intermediates, as well as the degradation mechanism, during the degradation of DBDPE. Further research is needed to understand the photolytic degradation pattern of DBDPE in the natural environment.