| The pollution of volatile organic compounds (VOCs) is receiving more and more attention. Among current technologies for controlling VOCs, electron beam irradiation technology has been showing its nice future.Toluene was selected as the representational matter of VOCs and irradiated with electron beam in the dose range of 5kGy-40kGy in a Tedlar bag and a flow bench system respectively. In addition, the products have been analyzed with GC/MS. The experimental results show that:When the gas flux is 0.5-1.2Nm3/h, the removal efficiency of toluene of which original concentrations are 1600mg/m3 in the gas phase can be about 46.5% at 10kGy and 72.2% at 40 kGy; in the room temperature and at 5kGy, with the 0.1%(vol.) water concentration the removal efficiency of toluene of which original concentrations are 3 800mg/m3 in the gas phase can be about 15.1% and 23.3% when the water concentration is 0.1%(vol.).In addiation, toluene, SO2, NO and NH3 are irradiated at the same time with electron beam in the dose of 10kGy, the removal efficiency of toluene of which original concentrations are 480mg/m3 in the gas phase can be about 87.5%, and the removal efficiencies of SO2 and NO are 94% and 78%.Main organic products produced by irradiation are benzaldehyde, benzyl alcohol, benzoic acid, o-cresol and formic acid with little picoline, nitrotoluene and phenol. Main inorganic products are H2O, CO and CO2.In this paper, the mechanism of removal toluene is studied, and the contributions of OH free radical, N, O and electron to the oxidation of toluene are discussed emphatically. |
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