Abstract
Benzene is a toxic, volatile organic pollutant and does great harm to both human beings and atmospheric environment. Vacuum ultraviolet (VUV) photooxidation, an emerging efficient process for the oxidation of pollutants, was used to destroy gaseous benzene. The effect of key operating parameters such as relative humidity, residence time, initial benzene concentration, and reaction temperature was investigated to study the performance and mechanism of benzene VUV photooxidation. Results indicated that vapor can greatly improve benzene removal efficiency and inhibit ozone formation since it can be used by energetic VUV photons to produce hydroxyl radicals (•OH), highly reactive for benzene oxidation. The increase of residence time and decrease of initial benzene concentration can greatly improve both the removal efficiency and mineralization rate of benzene. •OH is mainly responsible for benzene oxidation in the VUV photooxidation process.
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