Abstract: TiO2 nano-particles were immobilized on activated carbon honeycomb (ACH) by impregnation method to prepare ACH/TiO2 photocatalyst. Experiments on dynamic photocatalytic degradation of toluene gas under UV excitation wavelength of 387 nm in a self-made photocatalytic reactor were carried out. The results indicated that ACH/TiO2 had a good synergistic effect, which could increase the degradation of initial concentration of toluene from 160 to 830 mg/m3. Moreover, the degradation rate of toluene could maintain the best level (90.0%) under the conditions of TiO2 in ACH/TiO2 12.5%±1%(w), initial concentration of toluene 410 mg/m3, relative humidity 30% and gas flow rate 1 L/min, respectively. Water vapor could affect the photocatalytic degradation of toluene gas. The degradation rate of toluene could be kept unchanged for 6 h under illumination with the flow stability.

Key words: TiO2 nano-particle, impregnation, activated carbon honeycomb, dynamic adsorption, toluene gas, photocatalytic oxidation

摘要： 采用浸渍法将纳米TiO2颗粒负载在蜂窝活性炭(ACH)表面制备出光催化网ACH/TiO2，在自制光催化反应器中38 nm波长紫外光激发下进行甲苯的动态催化降解实验. 结果表明，ACH和TiO2具有良好的协同效应，能将可降解甲苯初始浓度从160 mg/m3提高至830 mg/m3. 在ACH/TiO2中TiO2含量12.5%±1%(w)、反应器内湿度30%、甲苯初始浓度410 mg/m3及气体流速1 L/min的条件下，ACH/TiO2降解甲苯气体效果最佳，降解率达90.0%. 水蒸气影响光催化降解甲苯气体，在稳定气流下光照降解甲苯气体效率可在6 h内维持稳定.

关键词: 纳米二氧化钛, 浸渍, 蜂窝活性炭, 动态吸附, 甲苯气体, 光催化氧化