2种五溴联苯醚的光降解机理及影响因素研究  

Study on photodegradation mechanism and influencing factors of two pentabromodiphenyl ethers

作　　者：高震 刘芃岩[1] 马傲娟 邱鹏 Gao Zhen;Liu Pengyan;Ma Aojuan;Qiu Peng(College of Chemical and Environmental Sciences,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：《煤炭与化工》2019年第1期136-140,共5页Coal and Chemical Industry

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

摘　　要：五溴联苯醚现已被列入新型持久性有机污染物, BDE-99和BDE-100作为五溴联苯醚的典型代表,在环境中被普遍检出。利用气相色谱仪(GC)和气相色谱-质谱联用仪(GC-MS)研究了它们在不同溶剂和不同光源下的光化学降解规律及降解途径。结果表明:溶剂能够影响降解速率,溶剂的供氢能力是影响降解速率的主要因素,降解速率顺序均为正己烷>甲醇>甲苯>丙酮;不同溶剂中2种五溴联苯醚的降解速率均为BDE-99>BDE-100;己烷中BDE-99的降解产物相比BDE-100更丰富,降解产物均以连续脱溴生成低溴代联苯醚为主,同时存在环化成二溴二苯并呋喃和二苯并呋喃情况。Pentabromodiphenyl ethers(Penta-BDEs)have been listed in emerging persistent organic pollutants.BDE-99 and BDE-100,as typical representatives of pentabromodiphenyl ethers,are ubiquitous in environment.The rules and route of their photochemical degradation in different solvents and different light sources are studied by gas chromatograph(GC)and gas chromatography-mass spectrometry(GC-MS).The results show that the solvents can affect the degradation rate,and the hydrogen donor capacity of the solvent is the main factor of affecting the degradation rate,and the degradation rate sequence is n-hexane>methanol>toluene>acetone.The degradation rate of two pentabromodiphenyl ethers in different solvent is BDE-99>BDE-100.In n-hexane,the degradation products of BDE-99 are more abundant than BDE-100,the degradation products are mainly some low brominated diphenyl ethers and cyclized to dibromodibenzofuran and dibenzofuran.

关 键 词：五溴联苯醚 光化学降解 影响因素 降解产物 反应机理 

分 类 号：O644.1[理学—物理化学]