真空紫外光降解苯的研究
Study on degradation of benzene by vacuum ultraviolet
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摘要: 为了考察真空紫外光辐射在气体净化中的应用，以苯作为目标污染物，分别进行了紫外光波长、气体湿度、反应时间、初始浓度以及辐射功率对苯光解率的影响实验。实验结果表明，真空紫外光辐射方法净化气相污染物中的苯效果良好，在一定条件下，浓度为348.2 mg/m3苯污染气体真空紫外光降解率可达到90%。通过在不同条件下苯的降解率以及臭氧浓度变化，初步探讨了苯降解的机理以及降解途径。苯的降解主要是通过氢氧自由基（·OH）的加成以及后续一系列的氧化反应，降解产物为苯酚以及含有羟基的长链烃。
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关键词:
- 真空紫外光苯光解降解率
Abstract: In order to investigate the application of vacuum ultraviolet（VUV） in gas purification, benzene was chosen as target pollutant and the influences of ultraviolet light wavelength, humidity, reaction time and initial benzene concentration on the benzene degradation efficiencies were studied. Under specific conditions, air stream laden with benzene of 348.2 mg/m3 was purified by 90%. From the trends of benzene degradation efficiencies and O3 concentrations, the degradation mechanism and pathway of benzene photolysis were deduced. Decomposition of benzene is primarily from hydroxyl radical (·OH) addition and subsequent oxidation reaction. Byproducts of benzene photolysis are phenol and series of long chain hydrocarbons containing hydroxyl.-
Key words:
- vacuum ultraviolet
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