Synthesis of High-Activity TiO2-Based Photocatalysts by Compounding a Small Amount of Porous Nanosized LaFeO3 and the Activity-Enhanced Mechanisms
Synthesis of High-Activity TiO2-Based Photocatalysts by Compounding a Small Amount of Porous Nanosized LaFeO3 and the Activity-Enhanced Mechanisms
复制标题
少量多孔纳米LaFeO3复合合成高活性TiO2基光催化剂及其增活机理
DOI：
10.1021/jp203566v
复制
发表时间：
2011-06-30
影响因子：
3.7
通讯作者：
Fu, Honggang
中科院分区：
文献类型：
--
作者：
Jing, Liqiang;Qu, Yichun;Fu, Honggang
本研究以罗丹明B溶液为研究对象，采用一种可行的方法制备了高活性的TiO 2基光催化剂。该方法的关键是在纳米TiO 2上复合少量多孔LaFeO 3，延迟锐钛矿-金红石相转变，经800 ℃高温热处理后形成锐钛矿型TiO 2/金红石型TiO 2/LaFeO 3三相纳米结构异质结。基于其表面光电压响应，所得的三相异质结极大地促进了光生电荷分离，特别是促进了LaFeO 3的可见光诱导电子被吸附的O-2捕获，这是紫外或可见光活性增强的原因。该研究为制备高性能的TiO 2基纳米材料提供了一条可行的途径。
In this work, a feasible strategy has been developed to fabricate highly active TiO2-based photocatalysts for degrading rhodamine B solution under ultraviolet or visible irradiation. The key of this strategy is to compound a small amount of porous LaFeO3 to nanocrystalline TiO2, leading to the delay of anatase-rutile phase tansformation and then to the formation of the anatase TiO2/rutile TiO2/LaFeO3 three-phase nanostructured hetero-junctions after thermal treatment at a high temperature of 800 degrees C. The resulting three-phase heterojunctions greatly favor the photoinduced charge separation, especially promoting the visible induced electrons of LaFeO3 captured by the adsorbed O-2, based on their surface photovoltage responses, which is well responsible for the ultraviolet or visible activity enhancement. This work would provide a feasible route to fabricate high-performance TiO2-based nanomaterials.