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

• Published in: Journal of Shanghai University Vol. 14; no. 2; pp. 89 - 93
• Main Author: 施文彦 焦正 顾建忠 郭瑞云 吴文静 徐刚 胡谷雨 雷建求 吴明红
• Format: Journal Article
• Language: English
• Published: Heidelberg Shanghai University Press 01.04.2010; School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,P.R.China%Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,P.R.China
• Subjects: BDE; Classical Mechanics; Engineering; Environment; Life Sciences; Materials Science; Mathematical and Computational Engineering; Mechatronics; 中性自由基; 混合溶液; 电子束辐照; 羟基二苯醚; 闪光光解; 降解特性; 降解过程; 4-bromdiphenyl ether (BDE-4); electron beam (EB); laser flash photolysis; transient absorption; electron beam(EB); 4-bromdiphenyl ether(BDE-4)
• ISSN: 1007-6417; 1863-236X
• DOI: 10.1007/s11741-010-0203-3

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.