活性炭与TiO_2相结合去除室内污染物甲醛的实验研究(Ⅱ)  

EXPERIMENTAL RESEARCH OF PHOTODEGRA DATION OF INDOOR FORMALDEHYDE BY TiO_2 IMMOBILIZED ON AN AC FILTER(Ⅱ)

作　　者：鹿院卫[1] 李文彩[1] 王伟[1] 马重芳[1] 

机构地区：[1]北京工业大学"传热强化与过程节能"教育部重点实验室暨"传热与能源利用"北京市重点实验室,北京100022

出　　处：《太阳能学报》2008年第5期550-554,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50476036);北京市科技新星计划(2005A10);"传热强化与能源利用"北京市重点实验室开放基金

摘　　要：将TiO_2分别与两类活性炭吸附材料相结合,分析不同活性炭吸附作用对污染物甲醛的光催化去除影响。实验结果表明,以活性炭颗粒为载体负载TiO_2催化剂形成的催化剂膜对污染物的去除效率低于以蜂窝活性炭网为载体负载催化剂形成的催化剂膜;同以玻璃为载体的催化剂膜相比,以活性炭材料为载体的催化剂膜对污染物的去除同样表现为传质控制过程和光催化控制过程,且随流速增加,光催化反应从传质控制向光催化控制过渡的转换点提前,在低污染物浓度条件下,污染物的光催化去除受污染物传质和驻留时间控制,且驻留时间的影响是主要的,随着驻留时间的增加,污染物的去除率提高。This paper combined the TiO2 with two kinds of activated carbon to decompose the indoor formaldehyde. The experimental results shown that the photocatalytic reaction rate and removal of HCHO by TiO2 immobilized on a netlike activated carbon are higher than that of TiO2 immobilized on an a granular activated carbon. Comparing with TiO2/glass film, the photocatalytic reaction using TiO2/activated carbon film also comprise of mass transfer control process and photocatalytic control process, and the switch point of photocatalytic reaction changed from mass transfer control process to photocatalytic reaction control was advanced with the increasing of air stream velocity. In the lower concentration of contaminants, the photocatalytic reaction was controlled by the mass transfer and residence time of contaminants, and the effect of residence time on the photocatalytic reaction was primary. With the increasing of residence time, the photocatalytic removal of HCHO was increased. Those results will be the base of commercialization of photocatalytic technology.

关 键 词：传质 光催化 空气净化 效率 

分 类 号：TK511.4[动力工程及工程热物理—热能工程]