摘要：采用火焰化学气相沉积法法制备了掺碳纳米TiO₂光催化剂,对催化剂进行了表征。利用自制的连续管式光催化氧化装置研究了掺碳纳米TiO₂薄膜对苯气体的光催化降解规律,探讨了相对湿度、初始浓度及苯气体流速等因素对降解率的影响,并与P25粉的光催化性能进行了比较。实验结果表明:在催化剂负载量约为4.7 mg,254 nm和365 nm的8W紫外灯各一盏,相对湿度为80%、苯的初始浓度约为120 mg/m³、苯气体流量为400 mL/min(苯在光催化器中反应时间约为3.5 s)的条件下,苯的降解率可达到15%,高于P25粉的降解效果。

关键词： 掺碳纳米TiO_2；薄膜；光催化降解；苯

Abstract: The nano-sized carbon containing TiO₂ photocatalyst was prepared by flame CVD method, and characterized by means of TEM, XRD, etc. The photocatalytic degradation of benzene vapor over carbon containing TiO₂ nano-film was studied using a tubular photoreactor. The effects of relative humidity, initial concentration of benzene and flowrate or residence time on degradation degree were investigated, and a comparison on degradation rate with Degussa P25 was also made. Under the conditions of 3.5 s of residence time, 4.9 mg carbon containing TiO₂ loading, two 8W UV-lamps with main wavelength of 365 nm and 254 nm respectively, 80% relative humidity, and 120 mg/m³ benzene initial concentration, 15% degradation degree was obtained, whilst about 10% degradation degree was attained by Degussa P25 under the same experimental conditions. 

Keywords: nano-sized carbon containing TiO₂ ; photo-degradation; benzene