Synthesis of novel 2D-2D p-n heterojunction BiOBr/La2Ti2O7 composite photocatalyst with enhanced photocatalytic performance under both UV and visible light irradiation
Synthesis of novel 2D-2D p-n heterojunction BiOBr/La2Ti2O7 composite photocatalyst with enhanced photocatalytic performance under both UV and visible light irradiation
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新型2D-2D p-n异质结BiOBr/La2Ti2O7复合光催化剂的合成，在紫外光和可见光照射下具有增强的光催化性能
DOI：
10.1016/j.apcatb.2016.04.050
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发表时间：
2016-10-05
影响因子：
22.1
通讯作者：
Hou, Jun
中科院分区：
文献类型：
--
作者：
Ao, Yanhui;Wang, Kedan;Hou, Jun
在本工作中，一个有效的复合光催化剂组成的二维BiOBr纳米片和二维La 2 Ti 2 O 7薄纳米片。以染料罗丹明B和苯酚为降解对象，考察了其在紫外光和可见光照射下的光催化性能。结果表明，适量BiOBr纳米片改性的La 2 Ti 2 O 7具有较高的光催化效率，空穴作为主要自由基参与了光分解反应。通过对催化剂的形貌、晶化、光响应和电化学性能等进行表征，探讨了催化剂的高效光催化机理。结果表明，高的光催化性能可以归因于以下原因。首先，BiOBr的修饰使La_2Ti_2O_7的光响应扩大到可见光区，从而使复合材料被激活产生更多的电子空穴对。其次，BiOBr/La 2 Ti 2 O 7 p-n异质结的形成促进了电子通过界面的转移速率，提高了电子-空穴对的分离效率。这种新型的2D-2D p-n异质结构光催化剂有望成为环境修复的候选材料。(C)© 2016 Elsevier B. V.版权所有。
In the present work, an efficient composite photocatalyst composed of 2D BiOBr nanoplates and 2D La2Ti2O7 thin nanosheets was synthesized. The photocatalytic performance of the as-obtained samples was investigated by the degradation of dye Rhodamine B and phenol under both UV and visible light irradiation. The results demonstrated that the La2Ti2O7 modified with proper amount of BiOBr nanosheets exhibited high efficiency in the photocatalytic process, and the holes took part in the photo-decomposition reaction as the main radicals. The morphology, crystallization, photo-response and electrochemical properties of the obtained catalysts were characterized to understand the mechanism of high photocatalytic activity. The results illustrated that the high photocatalytic performance could be ascribed to the following reasons. First of all, the decoration of BiOBr enlarged the photoresponce of La2Ti2O7 to visible light region, thus the composite can be activated to generate more electron and hole pairs. Secondly, the formed BiOBr/La2Ti2O7 p-n heterojunction promoted the transfer rate of electrons through the interface and improved the separation efficiency of electron-hole pairs. It is expected that this novel 2D-2D p-n heterostructured photocatalyst would be a promising candidate for environmental remediation. (C) 2016 Elsevier B.V. All rights reserved.