用超临界异丙醇流体制备TiO_2／活性炭复合材料

Characteristics of TiO_2/activated carbon composites prepared by supercritical isopropanol

在存在超临界异丙醇介质的条件下,将钛酸异丙酯与活性炭反应生成具有光催化与吸附性能协同效应的TiO_2/活性炭复合材料.产生协同效应,可使低浓度污染物快速地表面富集和吸附净化,加快了污染物的光催化降解速率,TiO_2的光催化作用又促使被活性炭吸附的污染物向TiO_2表面迁移,使活性炭吸附能力得以恢复,实现了吸附剂的原位再生.

The supercritical treatment can be effective for preparing the photo-catalytic composites possessing high synergetic effects of adsorption and photo-catalytic decomposition. When the synergetic effects come into being, the pollutants can be adsorbed and decomposed effectively by the composites, the photo-catalytic decomposition rate can be accelerated. The photo-catalytic activity of Ti02 crystallites impels adsorbing of the pollutants by activated carbon（AC） on the surface of TiO2 crystallites, thus the adsorbility of the AC adsorbent can be recovered, and the in-situ regeneration of the adsorbent is achieved.