利用UVC去除低浓度苯的实验研究

探讨了不同实验参数对苯的UVC去除效果的影响，获得了苯的去除率与苯的初始浓度、气体流量、相对湿度和氧气含量等参数之间的关系。数据表明，在实验条件范围内，苯的去除率的倒数与苯初始浓度、气体流量之间为线性关系；苯的去除率随相对湿度的增加呈现先升高后缓慢降低的关系，最佳相对湿度值在30%～50%之间；苯的去除率随氧气量的增加而缓慢增加；波长为185+254 nm的UV与254 nm的UV相比净化效果更为理想。还分析了苯降解产生的中间产物，探讨了苯的降解机理。

Experimental study on removal of low concentration benzene with UVC

Effects of different parameters on removal of low concentration benzene with UVC were experimented. Relations between removal efficiency and initial concentration, gas flow rate, RH, oxygen percentage were obtained. The results indicate that, under the experimental conditions, reciprocal of removal efficiency shows linear relations with initial concentration and gas flow rate. Removal efficiency of benzene increases rapidly at first and then decreases slowly while RH increases, the optimal RH is of 30% to 50%. Removal efficiency of benzene increases slowly while oxygen percentage gets higher. The effect of 185+254 nm UV is better than that of 254 nm. Moreover, based on the detection of intermediate species, the mechanism of benzene photolysis was discussed.