2D/2D BiOCl/K+Ca2Nb3O10- heterostructure with Z-scheme charge carrier transfer pathways for tetracycline degradation under simulated solar light
2D/2D BiOCl/K+Ca2Nb3O10- heterostructure with Z-scheme charge carrier transfer pathways for tetracycline degradation under simulated solar light
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具有 Z 型电荷载流子转移途径的 2D/2D BiOCl/K Ca2Nb3O10â 异质结构用于模拟太阳光下的四环素降解
DOI：
10.1016/j.apsusc.2018.10.057
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发表时间：
2019-02-01
影响因子：
6.7
通讯作者：
Chen, Min
中科院分区：
文献类型：
--
作者：
Liang, Ximeng;Zhang, Yuqi;Chen, Min
2D/2D异质结构由于其上级电荷分离效率而在光催化领域引起了广泛的关注，但高效的2D/2D异质结构光催化剂的构建仍然具有挑战性。在这项工作中，新的2D/2D异质结构包括BiOCl/K+ Ca 2Nb 3 O 10-nanostheets成功地通过一个简单的水热方法构建。在模拟太阳光照射下，BiOCl/K+ Ca 2Nb 3 O 10-的2D/2D异质结构对盐酸四环素（TC）的光催化降解有明显的增强作用，其中BiOCl质量分数为40%的最佳异质结构（BK-40）的催化性能分别是纯BiOCl和K+ Ca 2Nb 3 O 10-的6.41倍和1.75倍.基于光致发光和光电化学分析，改进的光催化性能主要是由于异质结构的协同效应，这可能有助于光生载流子的有效分离和转移。提出了一种直接的Z型电荷转移机制。此外，根据液相色谱-质谱联用结果，提出了TC的可能降解途径。该工作为合理设计和构建高性能的二维/二维Z型异质结构光催化剂提供了新的途径。
2D/2D heterostructures have attracted considerable attention in photocatalysis field owing to their superior charge separation efficiency, but the construction of highly efficient 2D/2D heterostructures photocatalysts remains challenging. In this work, novel 2D/2D heterostructures comprising of BiOCl/K+Ca2Nb3O10- nanosheets were successfully constructed via a facile hydrothermal approach. The resultant 2D/2D BiOCl/K+Ca2Nb3O10- heterostructures performed the enhanced photocatalytic degradation of tetracycline hydrochloride (TC) under simulated sunlight irradiation, and the catalytic performance of the optimal heterostructures with 40 wt% of BiOCl (marked as BK-40) was 6.41 and 1.75 times than that of pristine BiOCl and K+Ca2Nb3O10-, respectively. Based on the photoluminescence and photo-electrochemical analyses, the improved photocatalytic performance is primarily due to the synergistic effect of the heterostructures which could contribute to the efficient separation and transfer of photoinduced charge carriers. A direct Z-scheme charge transfer mechanism was proposed. In addition, the possible degradation route of TC was proposed based on the liquid chromatography-mass spectrometry results. This work provides a new protocol for the rational design and construction of high-performance 2D/2D Z-scheme heterostructure photocatalysts for environmental remediation.