真空紫外光氧化降解苯研究
首发时间:2014-06-23
摘要:苯是一种毒性极大的VOCs,对人类健康与大气环境的危害严重。本文以苯作为目标污染物,采用新兴、高效的降解技术---真空紫外光氧化技术,探究了湿度、停留时间、初始浓度、反应温度对苯光解率的影响以及苯降解机理。结果表明,高能紫外光激发的羟基自由基的是苯降解的主要途径。水蒸气能有效促进苯的降解并抑制臭氧产生,因为水蒸气在真空紫外光照射下能分解产生羟基自由基。增长停留时间、降低苯的初始浓度均会有效提高苯的去除效果与矿化率。
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Photooxidation of gaseous benzene by 185 nm VUV irradiation
Abstract:Benzene is one of the toxic VOC pollutants and does great harm to both human being and atmospheric environment. Vacuum ultraviolet (VUV) photooxidation, as an emerging efficient process for pollutants oxidation, was used to destruct gaseous benzene. The effect of key operating parameters such as relative humidity (RH), residence time, initial benzene concentration and reaction temperature were investigated to study the performance and mechanism of benzene VUV photooxidation. Results indicated that vapour can greatly improve benzene removal efficiency and inhibit ozone formation since it can be used by energetic VUV photons to produce hydroxyl radicals (oOH), which is highly reactive for benzene oxidation. The increase of residence time and the decrease of initial benzene concentration can greatly improve both the benzene removal efficiency and mineralization rate. oOH dominates benzene oxidation in the VUV photooxidation process.
Keywords: Vacuum ultraviolet photooxidation benzene vapor hydroxyl radical
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