Liu Shou-Xin, Sun Cheng-Lin
College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China.
J Environ Sci (China). 2006;18(3):557-61.
Preparation of photocatalytic regenerationable activated carbon (AC) is the key step for the practical application of in situ regeneration of exhausted AC. A novel photocatalytic regenerationable AC was prepared by sol-gel TiO2 in this work. The adsorption and regeneration performance of TiO2/AC were evaluated using phenol as model compound. Scanning electron microscope (SEM) and nitrogen (77 K) adsorption isotherm were used to determine the surface area, pore structure and the distribution of TiO2. The results showed that with the increase of TiO2 loading, adsorption capacity of TiO2/AC decreased and the regeneration efficiency increased. The photocatalytic regenerationable AC with suitable TiO2 loading (2 wt%) exhibited suitable adsorption capacity and regeneration efficiency. TiO2 located mainly in the entrance of macro-pore of carbon. The prepared TiO2/AC exhibited similar surface structure and pore structure with material carbon.
制备光催化可再生活性炭（AC）是废活性炭原位再生实际应用的关键步骤。本研究通过溶胶 - 凝胶法制备TiO₂，从而制备出一种新型的光催化可再生活性炭。以苯酚为模型化合物，评估了TiO₂/AC的吸附和再生性能。利用扫描电子显微镜（SEM）和氮气（77K）吸附等温线来测定TiO₂的表面积、孔结构及分布。结果表明，随着TiO₂负载量的增加，TiO₂/AC的吸附容量降低，再生效率提高。具有合适TiO₂负载量（2 wt%）的光催化可再生活性炭表现出适宜的吸附容量和再生效率。TiO₂主要位于活性炭大孔的入口处。制备的TiO₂/AC与原料活性炭具有相似的表面结构和孔结构。
