核壳型磁载二氧化钛光催化剂研究进展

Progress in Study on Core-shell Magnetic TiO_2 Photocatalyst

核壳型磁载TiO2光催化剂是将TiO2沉积在磁性物质上所得到的核壳结构的复合粒子,可以在外加磁场作用下快速、高效地回收,是解决纳米颗粒TiO2分离回收难问题的一个有效途径。总结了近年来在磁载TiO2光催化剂的研究方面科研工作的进展,并提出了对其今后发展趋势的看法。对引入磁核后催化剂活性的变化及其诱因、在磁核与TiO2之间引入SiO2隔离层的作用以及热处理对体系产生的影响进行了较为详细的阐述,同时还介绍了以避免较高温度热处理为目标的低温制备工艺。

Core-shell magnetic titania photocatalyst is a composite produced by depositing tiatania on magnetic materials, which is quite easy to recover from a slurry system under an applied magnetic field. In this paper recent progress and perspective in future about this novel kind of photocatalyst are reviewed. Along with the introduction of magnetic core, the properties of TiO2 varies. The reasons for the variational photoactivity, the influence induced by the introduction of SiO2 between TiO2 shell and magnetic core, and the effect of heat treatment on the composite are presented. And the preparation methods aimed at avoiding high temperature calcination are also stated.