摘要
在自制的流化床光催化反应装置中研究了中低浓度(28～140 mg/m3)甲苯的气相光催化降解过程,考察了光照时间、初始浓度、表观气速和催化剂负载量等因素对甲苯光催化降解率的影响规律.结果表明,紫外灯照射约1.5 h,甲苯的转化率达最大值,甲苯初始浓度越低,维持此最大值的时间越久;在一定低浓度范围内(28～55 mg/m3),甲苯的转化率不随浓度变化,符合一级反应动力学,浓度进一步增加,则甲苯的转化率下降;表观气速和催化剂负载量的最佳值分别为3.3Umf和0.19 g TiO2/g SiO2.
In a self-designed fluidized-bed photoreactor, the degradation of toluene （28 - 140 mg/m^3） in the gas phase was studied and the effect of the illumination time, inlet concentration, air flow rate and TiOJSiO2 ratio on the degradation efficiency was investigated. The results showed that, upon illumination of catalyst, it required almost 1.5 hours to reach the maximum value of toluene conversion. The lower the toluene concentration was, the longer time the highest conversion of the toluene could be sustained for. The conversion of lower level toluene （28 -55 mg/m^3） didn＇t change with the concentration, which followed with first order kinetics, however, the higher level toluene conversion decreased with the increasing of the concentration. The best air flow rate and TiO2 loading values were 3.3 u f and 0. 19 g TiOJg SiO2 respectively.
出处
《环境污染治理技术与设备》
CAS
CSCD
北大核心
2005年第9期68-71,共4页
Techniques and Equipment for Environmental Pollution Control
基金
广东省科技计划重大专项项目资助(B2302714)
关键词
气-固流化床
光催化降解
甲苯
gas-solid fluidized bed
photocatalytic degradation
toluene
