气相中甲苯的臭氧-光催化降解

Degradation of Toluene in the Gas Phase by Combined Ozone and Photocatalysis

初步研究了气相中中低浓度 (1 0～ 80mg/m3)甲苯的臭氧 光催化联合降解 ,考察甲苯初始浓度、气体流量和湿度对降解效率及去除负荷的影响 ,并与单一光催化降解进行了比较 .结果表明 ,臭氧 光催化对甲苯的降解效率大大高于光催化的降解效率 ,在较高浓度时效果更为显著 ;甲苯浓度在 1 0～ 40mg/m3范围时 ,臭氧 光催化降解效率高达 90 %以上 ,但随甲苯初始浓度升高而缓慢地线性下降 ;湿度对甲苯的臭氧 光催化降解稍有影响 ,但去除率变化不超过 2 5 % .

The degradation of toluene (10～80mg/m 3) in the gas phase by combined ozone and photocatalysis was studied. The effect of the inlet concentration, air flow rate and humidity on the degradation efficiency and removal load was investigated. Then the efficiency of combined ozone and photocatalysis was compared with that of photocatalysis. The experiment results indicated that combination of ozone and photocatalysis was far more efficient than photocatalysis in degrading toluene, especially under high level inlet concentration. When the inlet concentration was in the range of 10～40mg/m 3, the degradation efficiency of combined ozone and photocatalysis was over 90% and dropped linearly and very slowly with the increase of inlet concentration of toluene. The degradation efficiency of combined ozone and photocatalysis was slightly affected by humidity with the efficiency difference less than 2 5%.