ACF负载TiO_2光催化清除低浓度气态苯的实验研究

Study on Low Concentration Gaseous Benzene by Photocatalyst TiO_2 Immobilized on an Activated Carbon Fiber

为有效清除密闭环境中低浓度气态苯,以钛酸丁酯为前驱物,采用sol-gel法和浸渍-提拉法制备了TiO2/ACF复合材料。采用正交试验研究了溶胶凝胶工艺参数中去离子水、无水乙醇、冰醋酸的加入量以及TiO2/ACF煅烧温度对ACF/TiO2光催化性能的影响,在动态试验装置中,考察了TiO2/ACF对低浓度气态苯清除效果,采用X射线衍射仪(XRD)对TiO2进行表征。结果表明,最佳制备工艺是钛酸丁酯7.5ml,无水乙醇22.5ml,冰醋酸10ml,去离子水3.5ml,煅烧温度400℃。样品锐钛矿含量100%,晶体平均粒径约为13.5nm;苯3h的平均动态清除率可达50%。

In order to remove low concentration gaseous benzene in closed ambient,TiO2/ACF composite was prepared by sol-gel and dipping-coating method with Ti（OC4H9）4 as precursor.Orthogonal experiment was conducted to investigate the effect of deionized water,C2H5OH,CH3COOH and calcination temperature of TiO2/ACF four factors on the photocatalytic activity of TiO2/ACF.The decomposition performance of TiO2/ACF prepared was investigated for low concentration gaseous benzene in dynamic system.TiO2 was also characterized by X-ray diffraction（XRD）.The results showed that the optimal technology were determined as the Ti（OC4H9）4 is 7.5ml,the C2H5OH is 22.5ml,the CH3COOH is 10ml,the deionized water is 3.5ml and the calcinations temperature of TiO2/ACF is 400℃,the content of anatase in sample is 100%,the average crystallite sizes is 13.5nm and the dynamic average degradation ratio of low concentration gaseous benzene reaches up to 50% in 3 hours period.