活性炭负载TiO_2的甲苯光催化降解性能研究  

Photocatalytic degradation of toluene over activated carbon supported TiO_2

作　　者：黄雯[1] 杨家宽[1] 范双艳[1] 

机构地区：[1]华中科技大学环境科学与工程学院,湖北武汉430074

出　　处：《工业催化》2007年第10期55-59,共5页Industrial Catalysis

摘　　要：以竹炭活性炭颗粒为载体,采用溶胶-凝胶法制备TiO2溶胶,以浸渍和微波辐照的方法实现催化剂的固定,高温活化制备了负载型TiO2光催化剂。采用XRD、FSEM和FT-IR等分析方法对催化剂样品进行了表征。以甲苯为目标污染物,在紫外光照下模拟污染物的吸附与降解情况,探究了甲苯初始浓度和空气流量对光催化降解效果的影响。并通过在紫外光照下通入洁净空气、微波辐照和高温处理三种方法研究了催化剂的再生效果。结果表明,该方法制备的TiO2为锐钛矿晶型,晶粒大小约为18 nm。甲苯的降解效率最高达到80%,其去除量先随负荷增加而上升,以后随负荷的进一步增加,甲苯的光催化去除量反而下降。微波辐照是实现催化剂再生的最为理想的方法。TiO2-sol was prepared by sol-gel technique and was supported on bamboo-derived activated carbon by impregnation, microwave irradiation followed by high-temperature activation. The TiO2/C photocatalyst was characterized by XRD, FSEM and FT-IR. Adsorption and degeneration of toluene over the photocatalyst was simulated under ultraviolet irradiation, and influence of initial concentration and flow rate of toluene investigated. Regeneration of the photocatalyst was studied by passing clean air into the reactor under ultraviolet irradiation, microwave irradiation and high-temperature treatment. The results showed that the TiO2 photocatalyst was of anatase crystalline phase with grain size of about 18 nm; degradation efficiency for toluene was up to 80% ; microwave irradiation was the best way for catalyst regeneration.

关 键 词：活性炭 二氧化钛 气相光催化 甲苯 再生 

分 类 号：X701[环境科学与工程—环境工程] TQ426.6[化学工程]