Synthesis of High-Activity TiO2-Based Photocatalysts by Compounding a Small Amount of Porous Nanosized LaFeO3 and the Activity-Enhanced Mechanisms

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• 作者：Liqiang Jing ; Yichun Qu ; Haijiao Su ; Changhao Yao ; Honggang Fu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：June 30, 2011
• 年：2011
• 卷：115
• 期：25
• 页码：12375-12380
• 全文大小：874K
• 年卷期：v.115,no.25(June 30, 2011)
• ISSN：1932-7455

文摘

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 heterojunctions after thermal treatment at a high temperature of 800 掳C. The resulting three-phase heterojunctions greatly favor the photoinduced charge separation, especially promoting the visible induced electrons of LaFeO₃ captured by the adsorbed O₂, 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.