二氧化钛薄膜的制备及其光催化性能

Preparation of Titanium Dioxide and Its Photocatalytic Properties

笔者利用浸提技术把二氧化钛固定在不锈钢丝网上,通过XRD对其物相进行分析,利用扫描电镜表征其微观形貌,利用甲基橙作为目标污染物,探索并研究了搅拌、浸提次数、掺杂、光源等因素对二氧化钛光催化降解性能的影响以及其重复使用效果。结果表明:所制得的二氧化钛主要为锐钛矿型。随着浸涂次数的增加,不锈钢丝网表面二氧化钛薄膜的微观形貌有所变化;搅拌、浸提次数、掺杂镧有利于二氧化钛光催化活性的提高,二氧化钛利用紫外光的能力比利用可见光的能力更强;随着浸提次数的增加,二氧化钛对甲基橙的光催化降解效率呈现先增大后减少的趋势,当浸提达到7次时光催化降解效率最高,4h降解率可达77.6%;所制得的负载有二氧化钛薄膜的不锈钢丝网在重复性实验中,除第一次催化降解后效率有降低外,其他都基本不变,说明制得的样品可以长期用于光催化降解。

This research use dip coating technology, the TiO2 on the stainless steel wire mesh. We analyze the phase by XRD, using scanning electron microscopy （SEM） characterization of the microstructure, using methyl orange as a target the pollutant, explores the stirring, coating number, doping, the light source on the effect of TiO2 photocatalytic degradation of performance and the effect of repeated use.The results showed that： TiO2 that we made is mainly anatase type. With the increase of number of dip coating, microstructure of TiO2 thin film on the surface of stainless steel wire mesh change. Stirring, coating number, doped lanthanum make for improving photocatalytic activity of TiO2, TiO2 using ultraviolet a- bility batter with ability of visible light. With the increase of number of dip coating, TiO2 photocatalytic degradation of methyl orange showed the efficiency first increase and then decrease, catalytic degradation efficiency of the 7 membrane layer is the highest, 4 h the degradation rate is 77.6%. Immobilize TiO2 thin film on stainless steel wire mesh in the repetitive experiments, except the first after the catalytic degradation efficiency is reduce, other is basically remain unchanged, sta- ting it can be long--term use the light catalytic degradation.