负载型TiO_2光催化薄膜结构控制及光催化活性

Preparation of TiO_2 Film on Stainless Steel Webnet and the Degradation of Formaldehyde

采用溶胶-凝胶法在不锈钢丝网上负载TiO2薄膜,通过SEM、XRD和TG-DTA对其进行表征.研究了聚乙二醇(PEG)分子量及添加量、水加入量、涂膜次数和煅烧温度等工艺条件对样品光催化降解甲醛性能的影响.结果表明,通过工艺条件控制可得具有较高光催化活性的负载型TiO2光催化薄膜.在钛酸丁酯乙醇溶液中添加适量PEG600和水,经反应制备的TiO2溶胶,涂膜于不锈钢丝网表面,450℃煅烧后获得具有中孔结构的TiO2混晶薄膜,该薄膜对甲醛光催化降解率达90%以上.

Photocatalytic titanium dioxide films coated on stainless steel webnet were prepared by a sol-gel route. SEM, XRD and TG-DTA were employed to characterize the samples. The effects of the films prepared with different proceedings on photoactivity were investigated by formaldehyde photodegradation, such as the molecular weight of PEG, the amount of PEG, moisture content, the thickness of the films and the annealing temperatures. The formaldehyde photodegradation ratio can reach above 90% by the TiO2-based films. XRD patterns and SEM observation indicate that the TiO2 films with mesoporous structure are composed of mixed rutile and anatase crystals.