超临界乙醇流体制备TiO2光催化剂(Ⅰ)合成与光催化性能

引　言自 1972年日本东京大学的藤 山鸟昭等和本多健一报道了在光电池中光辐射TiO2 可持续发生水的氧化还原反应产生H2 以来[1] ,纳米半导体多相光催化反应方面的研究得到了深入而广泛的开展 .光催化氧化法结构简单 ,操作条件容易控制 ,氧化能力强 ,无二次污染 ,加之TiO2 具有化学稳定性高、无毒、价廉、催化活性高等优点 ,因而具有广阔的应用前景[2 ] .TiO2 粒子形态 (包括粒径、晶型、表面性质等 )对光催化活性有较大影响[3～ 5] .目前大多数研究中主要采用商品TiO2 或将其改性后使用 ,难以在催化剂制备时优化与催化活性密切相关的粒…

PREPARATION OF PHOTO-CATALYTIC TiO2 BY SUPERCRITICAL ETHANOL (Ⅰ) SYNTHESIS AND PHOTOCATALYSIS

Photo-catalytic TiO 2 was prepared from tetraisopropyl titanate (TPT) in supercritical ethanol. It was found that TPT in supercritical ethanol could be effectively converted into the anatase-form of TiO 2 crystallites. The anatase-form of TiO 2 as a photo-catalyst was evaluated for its adsorptivity and subsequent photo-catalytic activities on formaldehyde, one of the harmful air pollutants in the environment. As a result, the supercritically treated TiO 2 had a high decomposing ability. Under the same condition, the experiment was repeated for 5 times,and photocatalysis of the samples did not decrease. This indicated that the supercritical treatment was effective to prepare photo-catalytic TiO 2, which was feature by stability, longevity and high photo-catalytic decomposition of formaldehyde for environmental cleaning. Meanwhile, unlike conventional chemical reaction, which is complex and time-consuming, supercritical treatment is easy to operate, saving both time and labor.