光催化再生型活性炭的研制

光催化再生型活性炭的研制是实现吸附饱和活性炭原位再生的重要环节。本文采用溶胶凝胶——再活化法在商品活性炭表面合成TiO2光催化剂，制得新型炭吸附材料一光催化再生型活性炭。以苯酚为模型化合物，考察了该材料的吸附性能和紫外光照射条件下的光催化再生性能。以扫描电子显微镜、低温液氮吸附研究光催化再生型活性炭的表面结构、孔径结构和TiO2的分布状况。结果表明，光催化再生型活性炭保留了原料活性炭的吸附性能，在紫外光照射下即可逐渐恢复其吸附性能。其吸附性能随担载量的增加而降低，再生率随担载量的增加而升高，催化剂担载量为2．0wt％活性炭具有适宜的吸附性能和光催化再生性能。其再生率随再生次数增加而下降。光催化再生型活性炭具有原料炭相似的表面结构和孔径结构。TiO2在活性炭基材料表面呈不均匀分布，主要集中在活性炭的大孔和表面凹陷处。

STUDY ON REGENERATIONABLE ACTIVATED CARBON IN LIGHT CATALYSIS

Preparation of photocatalytic regenerationable activated carbon is the key step for the in-situ regeneration of saturated activated carbon. A novel photocatalytic regenerationable activated carbon material was prepared by sol-gel combined with reactivation method. The adsorption and regeneration performance of prepared carbon were evaluated by using phenol as model compound. Scaninig Electron Microscope (SEM) and Nitrogen(77K) adsorption isotherm were used to determined the surface structure,pore structure and the distribution of TiO2 catalyst. The results revealed that photocatalytic regenerationable activated carbon exhibited high adsorption capacity which can be regenerated effectively under UV irradiation. With the increase of catalyst loading,the adsorption capacity of prepared carbon decreased and the regeneration efficiency increased. 2wt% TiO2 loaded carbon exhibited the suitable adsorption capacity and the regeneration efficiency. TiO2 photocatalysis located mainly in the entrance of surface macro-pore of carbon.The prepared photocatalytic regenerationable activated carbon exhibited similar surface structure and pore structure with material carbon.