具有硫空位缺陷的氮掺杂碳包覆硫化锌用于增强可见光区域的光催化活性

N-Doped Carbon-Coated ZnS with Sulfur-Vacancy Defect for Enhanced Photocatalytic Activity in the Visible Light Region.

作者信息

Peng Hao, Liu Daixin, Zheng Xiaogang, Fu Xiaojin

机构信息

College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China.

College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang 641100, China.

出版信息

Nanomaterials (Basel). 2019 Nov 21;9(12):1657. doi: 10.3390/nano9121657.

In this work, N-doped carbon-coated ZnS with a sulfur-vacancy defect (ZnS@N-C) was performed for the visible-light-driven photodegradation of tetracycline hydrochloride (TCH). The obtained ZnS@N-C exhibited enhanced photocatalytic activity compared with ZnS for TCH removal. Among these ZnS@N-C composites, ZnS@N-C-3 with N-doped content of 3.01% (100 nm) presented the best visible-light photocatalytic activity and superior long-term photocatalytic stability after five cycle times for TCH removal in the visible light region. This may be ascribed to the interface between the N-doped carbon shell and ZnS with a sulfur-vacancy defect for efficient charge transfer and the restrained recombination of charge carriers. Electron spin resonance (ESR) results indicate that the ·O radical plays a crucial role in the enhanced photocatalytic activity of ZnS@N-C-3.

在这项工作中，对具有硫空位缺陷的氮掺杂碳包覆硫化锌（ZnS@N-C）进行了可见光驱动的盐酸四环素（TCH）光降解研究。与ZnS相比，所制备的ZnS@N-C对TCH去除表现出增强的光催化活性。在这些ZnS@N-C复合材料中，氮掺杂含量为3.01%（粒径100 nm）的ZnS@N-C-3在可见光区域对TCH去除表现出最佳的可见光光催化活性和五次循环后的优异长期光催化稳定性。这可能归因于氮掺杂碳壳与具有硫空位缺陷的ZnS之间的界面有利于有效的电荷转移以及抑制电荷载流子的复合。电子自旋共振（ESR）结果表明，·O自由基在ZnS@N-C-3增强的光催化活性中起关键作用。