不同负载形态TiO_2薄膜光催化亚甲基蓝效能分析

Methylene blue photocatalytic efficiency analysis under different forms of load titanium dioxide thin film

针对目前光催化中催化效率低的问题,采用溶胶-凝胶法及浸提技术,分别对玻璃片、纤维膜、钢丝网进行TiO_2的固定化负载.通过微观形貌进行分析,利用亚甲基蓝为目标污染物,探究制备以及光催化工艺对TiO_2催化降解性能的影响及其重复使用效果.结果表明:随着浸涂次数的增加,不同载体的表面TiO_2薄膜的微观形貌有所变化,对亚甲基蓝的光催化降解率呈现先增大后稳定的趋势,降解率从大到小为玻璃片、纤维膜、钢丝网,薄膜最优镀膜次数分别为3,4,4次.采用玻璃片镀膜4次所制备的TiO_2光催化降解率最高,4 h紫外光降解率可达75. 3%.

To solve the problem of current photocatalysis with low catalytic efficiency,the immobilized loading of titanium dioxide was carried out on glass sheet,fiber membrane and steel wire mesh by sol-gel method and leaching technique.The effects of preparation and catalytic process on the catalytic degradation of titanium dioxide were analyzed with methylene blue as target pollutants.The results show that with the increasing of dip coating number,the photocatalytic degradation efficiency of methylene blue on the surface of titanium dioxide is increased with latter stability.The decreasing sequence of removal rate is glass sheet,fiber membrane and steel mesh,and the best numbers of film coating are 3,4 and 4,respectively.The photocatalytic degradation efficiency of titanium dioxide prepared by glass coating for 4 times is the highest,and the degradation rate for 4 h UV can reach 75.3%.