碱性及含硫化合物对十溴联苯醚热降解的影响  

Influence of alkaline and sulfur-containing compounds on the thermal degradation of decabromodiphenyl ether

作　　者：刘芃岩[1] 高兰[1] 张雅婧[1] 李占圣 李牧原 LIU Peng-yan;GAO Lan;ZHANG Ya-jing;LI Zhan-sheng;LI Mu-yuan(College of Chemistry and Environmental Science,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《中国环境科学》2020年第6期2658-2663,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(21377033);河北省自然科学基金资助项目(B2018201224);河北省教育厅重点项目(ZD20131046)。

摘　　要：将十溴联苯醚(BDE-209)于400~600℃的温度范围内进行热降解,利用GC、GC/MS对产物种类及含量变化进行分析,讨论了温度、时间、碱性化合物和含硫化合物对BDE-209降解以及对溴代二噁英生成的影响.结果表明.温度和时间均是BDE-209热降解和生成溴代二噁英的重要影响因素;热降解40min时,450℃条件下溴代二噁英生成量最多;产物种类证实碱性化合物通过与BDE-209脱溴形成的HBr反应促进降解,且可抑制二噁英的生成;含硫化合物的添加同样促进BDE-209降解,抑制二噁英的形成,其详细的抑制机理有待进一步确定,BDE-209的降解反应有两种情况,即苯环上的脱溴反应和醚键的断裂反应.The thermal degradation of decabromodiphenyl ether(BDE-209)was studied at the temperature range of 400~600℃.The types and contents of its degradation products were determined using GC and GC/MS techniques.The effects of temperature,time,and alkaline-and sulfur-containing compounds on the thermal degradation of BDE-209,as well as the formation of brominated dioxins,were discussed in this study.The results showed that both temperature and time were the two key factors for both the thermal degradation of BDE-209 and the formation of brominated dioxins.When BDE-209 was pyrolyzed at 450℃for 40minutes,the brominated dioxins were generated to the maximum extent.The types of the products confirmed that alkaline compounds promoted the thermal degradation of BDE-209 by reaction with HBr formed from the BDE-209 debromination,and inhibited the formation of dioxins.Similarly,the sulfur compounds also promoted the degradation of BDE-209 and inhibited the formation of dioxins.However,the detailed inhibition mechanism needs to be further investigated in the future study.There are two kinds of degradation reactions for BDE-209,namely,debromination of phenyl rings and cleavage of ether bond.This research may provide a theoretical basis for the safe disposal of BDE-209-contained products and the reduction of secondary pollution.

关 键 词：溴代二噁英 十溴联苯醚 热降解 碱性化合物 含硫化合物 

分 类 号：X131[环境科学与工程—环境科学]