锐钛矿相二氧化钛晶粒的形貌调控及其显微结构分析

Synthesis and microstructure analysis of shape-tuned anatase TiO2 particles

利用简单水热反应,通过在弱酸性条件下引入氟离子,促使晶体的生长方式发生改变,使得其形貌由十面体转化为块状立方体,主要暴露晶面由常规的(101)晶面转变为(001)晶面,最终形成两种尺寸均一,但形貌不同的锐钛矿相二氧化钛晶体颗粒.通过两者罗丹明B光降解实验比较可以发现主暴露面为(001)面的非常规块状立方体二氧化钛晶粒的光催化性能要高于主暴露面为(101)的十面体结构晶粒.这被归因于(001)晶面具有的较高表面能及其可能存在的缺陷结构和氧空位密度.

The anatase Ti O2 was synthesized by simple hydrothermal route in acid solution. The shape of samples transformed from decahedron into square-like cube because the mainly exposed facets changed from( 101) into( 001). For the high surface energy and abundant structural defects on( 001) facet,square-like anatase nanoparticles showed improved photocatalytic activity for degradation of Rhodamine B compared with traditional octahedron nanoparticles.