掺碳纳米TiO2光催化降解空气中苯的实验研究  

Study for Photocatalytic Degradation of Benzene in Air over Carbon Containing TiO_2 Nano-film

作　　者：张亚宁[1] 谢洪勇[2] 徐巧莲[1] 

机构地区：[1]大连理工大学化工学院,辽宁大连116012 [2]上海第二工业大学环境工程系,上海201209

出　　处：《中国粉体技术》2007年第6期18-22,共5页China Powder Science and Technology

基　　金：大连理工大学材料学科基金;纳米+X科研经费资助

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。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/m^3 benzene initial concentration, 15% degradation degree was obtained,whilst about 10% degradation degree was attained by Degussa P25 under the same experimental conditions.

关 键 词：掺碳纳米TiO2 薄膜 光催化降解 苯 

分 类 号：X703.1[环境科学与工程—环境工程]