负载型TiO_2/海泡石光催化氧化亚甲基蓝的效果

Photo-catalytic Oxidation of Methylene Blue by Titanium Dioxide-coated Sepiolite

以亚甲基蓝的光催化降解为反应模型,对TiO2改性海泡石(海泡石/TiO2)的光催化性能及影响因素进行了探讨。实验结果表明:海泡石/TiO2经450℃处理后具有最大的光催化活性,其对亚甲基蓝的光降解率与等量的用同样方法合成的经550℃处理的TiO2纯样相当,并易于回收。亚甲基蓝的光降解率随着紫外光光强的增大而增大,海泡石未改变TiO2的吸收波段,即可见光对亚甲基蓝的光降解没贡献。

Using the photoeatalytie degradation of methylene blue （MB） in aqueous solution was treed as a probe reaction, this paper probed into the photo - catalytic property of TiO2 - modified sepiolite （TiO2/Sepiolite） and its influence factors. The experimental results showed that TiO2 - costed sepiolite calcined at 450℃ had the best photo - catalytic activity, the photo - degradation rate of MB catalyzed by it was almost the same as by pure TiO2 synthesized with the same method and calcined at 550℃, and it was easy to be retreated. The photodegradation rate of MB increases with the increase of ultraviolet strength. Sepiolite cannot change the light absorption band of TiO2, that is, visible light has no eontrbution to the photo - degradation of MB.