载体对负载型催化剂的光催化活性影响研究

Photocatalytic Activities Effects of Carrier on Immobilized Photocatalyst

分别以粉煤灰、高岭土颗粒为载体,TiCl4水解法制备负载型催化剂,以XRD、TG-DTA方法对所制备的催化剂进行表征。结果表明,TiO2/粉煤灰样品,TiO2均匀分散在粉煤灰表面;TiO2/高岭土样品,部分钛离子进入高岭土层状结构中,多余的正电荷有助于吸附更多的羟基自由基,从而提高催化剂的光催化活性。以草酸为目标降解物考察了催化剂的光催化活性,结果表明,所制得的TiO2/高岭土具有较高的光催化活性,3h降解率达95.5%;TiO2/粉煤灰5h降解率可达99%。

The immobilised-catalysts were prepared by the titanic hydrolysis chloride method from kaolin and flyash particles and the structure characterization was carried out by XRD and TG-DTA techniques.It showed that titanium oxide loaded uniformly on flyash particles.For TiO2/ kaolin samples,some of titanium ions took part in the layer structure of kaolin and the superabundance positive charges can adsorb more hydroxide groups which contribute to increasing the photocatalytic activities.The photocatalytic activities were evaluated by photocatalytic reaction of oxalic acid.Results showed that the TiO2/kaolin samples have higher photocatalytic activities and its degradation rates were 95.5% in 3 hours.The degration rate for TiO2/flyash samples was 99% in 5 hours.