School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China.
J Colloid Interface Sci. 2017 Nov 15;506:93-101. doi: 10.1016/j.jcis.2017.07.017. Epub 2017 Jul 5.
The artificially Z-scheme heterojunctions between WO nanosheet and SnNbO nanosheet with strongly coupled heterointerfaces were successfully constructed via a simple hydrothermal coassembly method. Transmission electron microscopy (TEM) and high-resolution TEM proved that an intimate contact interface was formed. The synthesized heterojunctions exhibites enhanced photodegradation efficiency for Rhodamine B under irradiation of visible light, and the highest reaction rate over 30%-WO/SnNbO nanosheet heterojunctions is about 4.7-fold and 2-fold higher than that of pristine WO and SnNbO, respectively. Such a considerable improvement could be mainly attributed to the rapid migration of the photo-induced e/h pairs through the nanosheets-coupled heterojunction interfaces. A possible directly Z-scheme charge transfer mechanism was proposed for the elimination of organic contaminants under irradiation of visible light. This work may furnish new insights into development of novel 2D/2D nanosheet heterojunctions with the enhanced photocatalytic activity.
通过简单的水热共组装方法成功构建了具有强耦合异质界面的 WO 纳米片和 SnNbO 纳米片之间的人工 Z 型异质结。透射电子显微镜（TEM）和高分辨率 TEM 证明形成了紧密接触的界面。合成的异质结在可见光照射下表现出增强的 Rhodamine B 光降解效率，最高反应速率超过 30%-WO/SnNbO 纳米片异质结分别比原始 WO 和 SnNbO 高约 4.7 倍和 2 倍。这种相当大的改进主要归因于光诱导 e/h 对通过纳米片耦合异质结界面的快速迁移。提出了一种在可见光照射下消除有机污染物的可能的直接 Z 型电荷转移机制。这项工作可能为开发具有增强光催化活性的新型二维/二维纳米片异质结提供新的思路。
