水热处理BaTiO_3制备金红石TiO_2及其光催化性能

Preparation and Photocatalytic Properties of Rutile TiO_2 from BaTiO_3 by Hydrothermal Treatment

将BaTiO3粉末溶于硝酸中,并进一步水热处理,制备得金红石TiO2。通过改变水热处理过程中的硝酸浓度、水热处理时间和温度,发现硝酸浓度是决定产物晶相的主要因素,高浓度硝酸有利于得到纯净的金红石相。FE-SEM观察发现,低浓度硝酸处理下得到的产物为均匀一致的纳米棒;高浓度下产物为细小的纳米颗粒。在紫外光照射下,测定了产物对异丙醇气体的光催化分解性能,发现高浓度硝酸处理得到的金红石TiO2由于具有更大的比表面积,因而具有更好的气体吸附性能和光催化性能。

Rutile TiO2 was obtained from acid treated BaTiO3 under hydrothermal treatment. The influences of acid concentration, temperature and treating time on the obtained products' crystalline phase, morphologies, surface properties and photocatalytic activities were investigated. Higher nitric acid concentration was in favor of purer and finer rutile particles, while hydrothermal temperature and time affect it little. FE-SEM observation shows that, uniform TiO2 nanorods are obtained with lower acid concentration and smaller TiO2 nanoparticles formed with higher concentration. Their photocatalytic activities were evaluated by the decomposition of gaseous 2-propanol (IPA) under UV irradiation. Rutile TiO2 treated with higher acid concentration exhibits better photocatalytic performances.