光催化功能陶瓷的研制

RESEARCH ON PHOTOCATALYTIC FUNCTIONAL CERAMICS

先制备钛酸溶胶和掺入Fe3+的钛酸溶胶;用溶胶-凝胶法分别将它们负载于炻器管和矩形蜂窝陶体上;再用程序升温法煅烧,得到纳米TiO2光催化功能陶瓷。经扫描电镜(SEM)测定,炻器载体上负载的光催化膜厚度为300～400nm,TiO2的粒径为15～20nm。将光催化炻器管用于模拟苯酚废水和某地表水的处理试验,在紫外光强一定、流速为40ml/min条件下的结果表明,无论掺Fe3+与否的TiO2光催化炻器管都有净化效果,其中以掺Fe3+最好,苯酚去除率为70.3%,灭菌率亦能达到99.5%。将光催化蜂窝陶瓷体用于净化空气试验时,在紫外光强、循环风量一定的条件下,其净化效果也是以掺Fe3+的TiO2最好,18h甲醛的去除率为99.5%,24h后的灭菌率亦能达到99.5%。

The preparation method of the photocatalysis functional ceramics was as follows： firstly, to prepare the titanic acid sol and the titanic acid sol mixing iron ions then, to load the soil in the stoneware tube and the honeycomb ceramics by the sol-gel technology; finally, to roast the product by the program heating. The thickness of loaded film and diameter of TiO2 grain was determined by SEM method as 300- 400nm and 15- 20nm respectively. The experiment on purification water and air was carried out with the photocatalysis functional ceramics under the specific condition. The results indicate that the photocatalysis functional ceramics all have purification effect. Among them, the catalyst mixing Fe^3＋ in TiO2 has the best effect. When purifing the water samples, the removeing rate of phenol and bacterium achieve 70.3% and 99.5%. When purifing the indoor air, the removeing rate of formaldehyde and bacterium all achieve 99.5%.