微波无极紫外光降解气态甲苯的试验研究

Study on the Photolysis of Gaseous Toluene by Microwave Discharge Electrodeless UV

采用微波无极紫外光降解甲苯气体,研究了加水量、甲苯添加量(初始浓度)、微波输入功率对甲苯光降解效率的影响,并对甲苯光降解反应动力学及中间产物进行了初步探讨。试验结果表明:随着微波输入功率的增加,甲苯去除率逐渐增加;随着甲苯初始浓度的增加,甲苯去除率逐渐降低;在一定范围内,随着加水量的增加,甲苯去除率增加;甲苯光降解反应过程符合一级动力学模型;甲苯光降解反应的中间产物主要有苯甲醛、苯酚、苯甲醇。

This paper studies the effects of the added water,the addition of toluene （the initial concentra- tion） and the input power on photodegradation of toluene by microwave discharge electrodeless UV. In ad- dition, we also make a preliminary discussion about the intermediate products and the dynamics equations in the reaction. The results show that the removal rate increases with the increasing of the input power, de- creases with the increasing of the initial concentration and increases with the added water within a certain range. Benzaldehyde,phenol, benzoic acid and benzylalcohol are the main intermediate products of the pho- tocatalytic degradation,which follows the first-order kinetics.