不同溶剂和光源下六溴苯的光降解研究

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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

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	Articles by authors
	Li Zhansheng
	Xu Yunfeng
	Liu Pengyan

Cite this article:

Li Zhansheng,Xu Yunfeng,Liu Pengyan. Study on photodegradation of hexabromobenzene under different solvents and light sources[J]. CCI, 2018, 41(3): 5-8,19.

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http://www.mtyhg.com.cn/EN/ OR http://www.mtyhg.com.cn/EN/Y2018/V41/I3/5

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