摘要
为了模拟光催化净化器去除室内污染物的最佳条件,搭建了光催化污染物HCHO去除循环实验台,利用浸渍涂膜法分别以活性炭颗粒及活性炭网为载体制备纳米TiO_2催化剂膜,通过实验对其光催化性能进行分析.实验结果表明,在HCHO浓度较高时,2种催化剂膜对HCHO的光催化去除随流速的增加表现为从传质控制过程向光催化控制过程过渡,且以活性炭网为载体的催化剂膜对HCHO的去除效率大于以活性炭颗粒为载体的催化剂膜;而在HCHO浓度较低时,由于HCHO驻留时间的影响,2种催化剂膜对HCHO的去除随流速增加而降低.
To analyse the optimal condition of photocatalytic removal of indoor air contaminant by air cleaner, an experimental system of photocatalytic degradation of HCHO was constructed and two photocatalytic TiO2 films were coated by dipping method on the granular active carbon and the netlike active carbon, respectively. The results showed that the photocatalytic removal of HCHO was controlled by mass transfer process and photocatalytic reaction process in the higher HCHO concentration, and the photocatalytic reaction switched from mass transfer process to photocatalytic reaction process with the increasing of flow velocity, and the removal of HCHO by TiO2 film coated on netlike active carbon was higher than that coated on granular active carbon. However, in the lower HCHO concentration, the removal of HCHO was reduced with the increasing of flow rate for the residence time of HCHO on the surface of TiO2. Those experimental results were useful to the application of photocatalytic technology.
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2008年第2期184-188,共5页
Journal of Beijing University of Technology
基金
国家自然科学基金(50476036)
'传热强化与过程节能'教育部重点实验室开放基金
关键词
光催化
空气净化
传质
photocatalysis
air purification
mass transfer
