摘要
以商品活性炭(AC)为载体, 采用溶胶-凝胶法制备不同比表面积和TiO2负载量不同的光催化剂(TiO2/AC). 用氮吸附、X射线衍射(XRD)、扫描电子显微镜(SEM)等表征方法, 获得了所制备的TiO2/AC性能参数; 并通过降解气相1,2-二氯苯(1,2-DCBz)的实验研究了TiO2/AC催化剂的光催化氧化性能, 主要考察参数包括催化剂使用量、比表面积、气相1,2-DCBz浓度等对光催化氧化的影响. 结果表明: 负载于AC上的TiO2颗粒粒径为10 nm左右, TiO2颗粒负载在大比表面积的载体AC上有利于光催化降解气相1,2-DCBz. 通过比较商用P25和自制TiO2/AC光催化剂对气相1,2-DCBz的降解效果, 证明了AC吸附作用和TiO2光催化降解的协同作用使TiO2/AC光催化剂对气相1,2-DCBz的降解效率有较显著的提高.
Using commercially available activated carbon （AC） as a carrier, photocatalysts of activated carbon-supported TiO2 （TiO2/AC） with different specific surface areas and TiO2 loading contents were prepared by the sol-gel method. Nitrogen adsorption, X-ray diffraction （XRD）, and scanning electron microscopy （SEM） were used to obtain the performance parameters of the TiO2/AC catalysts. The photocatalytic performance of the TiO2/AC catalysts was studied by using gaseous 1,2-dichlorobenzene. The influence of catalyst dose, specific surface area, and gaseous 1,2-dichlorobenzene concentration on this photodegradation was investigated. The results show that a nano-TiO2 deposit was formed with a particle size of approximately 10 nm. The loading of TiO2 onto the AC with a large specific surface area enhanced the photocatalytic activity of TiO2 photocatalysis with regard to the degradation of gaseous 1,2- dichlorobenzene. We show that TiO2/AC catalysts have a synergetic effect on AC adsorption and TiO2 photocatalysis during the degradation of gaseous 1,2-dichlorobenzene by comparing the photocatalytic performance of a commercial P25 catalyst and TiO2/AC catalysts.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2011年第9期2191-2199,共9页
Acta Physico-Chimica Sinica
基金
国家重点基础研究发展计划项目(2011CB201500)
国家科技支撑计划项目(2007BAC27B04-4)
水体污染控制与治理科技重大专项课题(2009ZX07317-003)资助~~
关键词
负载型TIO2
活性炭载体
比表面积
光催化剂
气相1
2-二氯苯
Supported mio2
Activated carbon support
Specific surface area
Photocatalyst
Gaseous 1,2-dichlorobenzene
