TiO_2/活性炭催化剂对4-CP的吸附和光催化活性  

PHOTOCATALYTIC PERFORMANCE OF TiO_(2) LOADED ON ACTIVE CARBON(AC) ON DEGRADATION OF 4-CP

作　　者：徐甦[1] 雷乐成[2] 周明华[2] 

机构地区：[1]浙江林学院环境科技学院,临安311300 [2]浙江大学环境工程研究所,杭州310027

出　　处：《环境化学》2006年第5期562-566,共5页Environmental Chemistry

摘　　要：采用常压金属有机物化学气相沉积技术在活性炭表面沉积构成纳米TiO2催化剂,XRD分析表明,沉积在活性炭表面的TiO2为锐钛矿晶型.TEM分析表明负载量为8%(wt)时,TiO2颗粒的粒径为10—20nm;载体负载前后BET面积仅改变了6%,表明负载TiO2后对活性炭的结构影响不大.利用Langmu ir-H inshelwood动力学模型探讨了TiO2/活性炭催化剂对4-CP的吸附行为和光催化活性之间的关系,求出4-CP降解反应速率常数Kr,在紫外光照条件下催化剂对4-CP的吸附明显增强.The adsorption characteristics of 4-CP on TiO2/AC catalyst system have been investigated. The relationship of the photodegradation of 4-CP and the adsorption behavior of 4-CP on TiO2/AC catalyst can be described by the Langmuir-Hinshelwood（L-H） kinetics model. The adsorption equlibrium constant calculated by Langmuir adsorption isotherms under dark adsorption conditions is smaller than calculated by L-H kinetics model under UV-light photodegradation, which shows that the adsorption of 4-CP on TiOz/AC catalyst has increased when under UV-light photodegradation.

关 键 词：对氯苯酚 光催化 二氧化钛 活性炭. 

分 类 号：O644.1[理学—物理化学]