2种五溴联苯醚的光降解机理及影响因素研究

doi:10.19286/j.cnki.cci.2019.01.039

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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。

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	高震
	刘芃岩
	马傲娟
	邱鹏

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

Abstract：

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.

Key words： Penta-BDEs photochemical degradation influence factor degradation product reaction mechanism

基金资助:

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）

通讯作者: 刘芃岩（ 1964— ），女，河北蠡县人，教授。

作者简介: 高震（ 1992— ），男，河北沧州人，硕士研究生。

引用本文:

高震，刘芃岩，马傲娟，邱鹏. 2种五溴联苯醚的光降解机理及影响因素研究[J]. 煤炭与化工, 2019, 42(1): 136-140. Gao Zhen， Liu Pengyan， Ma Aojuan， Qiu Peng. Study on photodegradation mechanism and influencing factors of two pentabromodiphenyl ethers. CCI, 2019, 42(1): 136-140.

链接本文:

http://www.mtyhg.com.cn/CN/10.19286/j.cnki.cci.2019.01.039 或 http://www.mtyhg.com.cn/CN/Y2019/V42/I1/136

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