一种具有微纳孔隙结构的二氧化钛多孔膜层光催化系统

Study on a Porous Titanium Dioxide Film Photocatalytic System with Micro-nano Pores Structure

采用溶胶-凝胶法配合以离子注入的方式,研制了一种具有纳米和亚微米(零点几个微米)孔隙结构的锐钛矿相二氧化钛光催化膜。首先通过常规的溶胶-凝胶法制得密实的二氧化钛膜层,然后采用具有一定动能的Fe离子轰击膜层,从而在膜层中形成大量的微纳孔隙。这些微纳孔隙明显提高了原膜层的比表面积。光催化降解甲基橙溶液的实验结果表明,无论是在紫外光下还是在可见光下,所得多孔膜层的光催化效果均优于未造孔的二氧化钛膜层。

A porous anatase TiO2 film with nano and sub-micro pores was fabricated by sol-gel method with ion implantation.A dense film was firstly fabricated by the conventional sol-gel method,which was then bombed by Fe ion with a certain kinetic energy to generate a great amount of micro-nano pores.These micro-nano pores significantly enlarge the specific surface area of the titanium dioxide film.The experimental results of photocatalytic decomposition of a methyl orange solution display that the porous film is better than the dense film for the photocatalysis both under ultraviolet light and under visible light.