不同溶剂和光源下六溴苯的光降解研究

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摘要

利用气相色谱仪GC、气相色谱-质谱联用仪GC-MS研究了替代型阻燃剂六溴苯在不同溶剂、不同光源下的光降解动力学及降解途径。结果表明，六溴苯的吸收光谱为210～280 nm，在260 nm处达到了最大吸收波长。在初始浓度、光源条件一定的条件下，六溴苯的光降解符合一级动力学方程。同一光源和同一浓度下，六溴苯的光降解速率为正己烷＞甲苯；在溶剂浓度相同、不同光源下，六溴苯的降解速率为500 W金卤灯＞500 W汞灯＞300 W汞灯＞500 W氙灯；六溴苯的降解途径为逐步脱溴过程，降解产物主要是低溴代的五溴苯、四溴苯、三溴苯等。

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	李占圣
	许云凤
	刘芃岩

关键词 ：六溴苯, 阻燃剂, 光解, 降解产物

Abstract：

The photodegradation kinetic and degradation pathway of substituted flame retardant hexabromobenzene under different solvents and different light sources were studied by gas chromatography ( GC ) and gas chromatography-mass spectrometry( GC-MS ). The results show that the absorption spectrum of hexabromobenzene is 210-280 nm and the maximum absorption wavelength is reached at 260 nm. Under certain initial concentration and light source, the photodegradation of hexabromobenzene accords with the first-order kinetic equation. The photodegradation rate of hexabromobenzene in n-hexane is faster than that in toluene under the same concentration and light source. Under the same solvent concentration and different light sources, the degradation rate of hexabromobenzene is 500 W metal halide lamp > 500 W mercury lamp > 300 W mercury lamp > 500 W xenon lamp. The degradation pathway of hexabromobenzene is gradual debromination process. The degradation products are mainly lower bromine generation benzenes, such as pentabromobenzene, tetrabromobenzene, tribromobenzene, etc..

Key words： hexabromobenzene flame retardant photolysis degradation product

基金资助:

国家自然科学基金资助项目（ 21377033 ）；河北省教育厅重点资助项目（ ZD20131046 ）；河北省自然科学基金（ B2018201
224 ）

作者简介: 李占圣（ 1993— ），男，河北邢台人，河北大学硕士。

引用本文:

李占圣，许云凤，刘芃岩. 不同溶剂和光源下六溴苯的光降解研究[J]. 煤炭与化工, 2018, 41(3): 5-8,19. Li Zhansheng, Xu Yunfeng, Liu Pengyan. Study on photodegradation of hexabromobenzene under different solvents and light sources. CCI, 2018, 41(3): 5-8,19.

链接本文:

http://www.mtyhg.com.cn/CN/ 或 http://www.mtyhg.com.cn/CN/Y2018/V41/I3/5

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