光降解用WO_3-TiO_2复合光催化剂

用溶胶 凝胶法制备了纳米WO3 TiO2复合薄膜型光催化剂·利用该薄膜对罗丹明B溶液的光催化降解作用,考察了钨酸盐种类及其掺杂量、涂膜层数、溶解氧、焙烧温度、焙烧时间、基体材料等因素对光催化活性的影响·结果表明,钨酸铵加入量x(W)=1 5%、多孔钛片为基质,涂覆9层、500℃下焙烧1h得到的WO3 TiO2薄膜型复合光催化剂活性最高,其光催化活性较纯TiO2光催化剂提高1 5倍·该温度下多孔钛片负载的TiO2为锐钛矿型·

A Composite WO3-TiO2 Photocatalyst for Photodegradation

The nano-crystal composite film photocatalyst WO3-TiO2 was prepared by sol- gel process. The effects of various tungstates with their doping amounts, the number of coating layers, the dissolved oxygen, the roasting temperature/time and various substrates on the photocatalytic activity were investigated through the photodecomposition action of films to the solution of Rhodamine B. Taking the parous Ti plate as a substrate, doping amount of (NH4)5H5 H2(WO4)] ·H2O x(W)=1.5%, cladding a layers of the composite WO3-TiO2 films and roasting for 1 hour at 500°C, the composite WO3-TiO2 film with the highest photocatalytic activity can be obtained and its photocatalytic activity is 1.5 times higher than that of pure TiO2. Meanwhile the phase of the composite WO3-TiO2 film thus formed is attributed to anatase phase.