Degradation characteristic of 4-bromdiphenyl ether in mixed solutions by electron beam irradiation

作者：SHI Wen yan JIAO Zheng GU Jian zhong GUO Rui yun WU Wen jing XU Gang HU Gu yu LEI Jian qiu WU Ming hong School of Environmental and Chemical Engineering Shanghai University Shanghai P R China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai P R China

来源：Journal of Shanghai University(English Edition), 2010, (02): 89-93.

The degradation characteristic of 4-bromdiphenyl ether (BDE-4) was investigated in different solutions.The study indicates that the process of direct degradation of this compound is dependent upon the bromine and the ether bond connected to diphenyl by electron beam.laser flash photolysis was employed to determine the degradation of each species (cationic,neutral,and anionic).From these data,intermediate products of BDE-4 degradation were shown for direct irradiationdegradation.The neutral radical was formed during the photolysis of these compounds.For all the compounds,diphenyl ether and hydroxybiphenyl were observed as common products.Reaction of the BDE-4 under electron beam was debromide.The debromide rate of BDE-4 at pH=5.5 is somewhat lower than that of BDE-4 at pH=10.0.The decomposition rate for BDE-4 is 99.8% at pH=10.0 on the dose of 14 kGy.BDE-4 from its radical could provide bromine ion into water and the cation radical of BDE-4 formed quickly recombine with hydrogen radical and formed phenyl ether.

• 出版日期2010-4-15
• 单位上海大学