Zhang Lijing, Zhu Xiufang, Wang Zhihui, Yun Shan, Guo Tan, Zhang Jiadong, Hu Tao, Jiang Jinlong, Chen Jing
College of Chemical Engineering, Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Huaiyin Institute of Technology Huaian 223003 China
RSC Adv. 2019 Feb 5;9(8):4422-4427. doi: 10.1039/c8ra07751g. eCollection 2019 Jan 30.
Nonmetal doping is an efficient way to increase the photoresponse range of ZnO. However, the mechanism for improving the light response range of ZnO with nonmetal doping is not clear. Herein, ZnO doped with S was successfully prepared by ion exchange and calcination methods, which resulted in the uniform distribution of sulfur ions in ZnO. The S element doped was mainly S and S, which was identified by XPS. We studied the influence of S on the photogenerated charge characteristics of ZnO with SPS. Results indicated that the uniform distribution of S dopants elevated the valence band maximum by mixing S 3p with the upper valence band states of ZnO. The valence band maxima of S-ZnO was 0.37 eV higher than that of ZnO. This result was the main reason for the improvement in the light response. We also studied the photocatalytic activity of Ag/S-ZnO. Ag/S-ZnO with 10 wt% Ag loading showed the highest photocatalytic degradation rate for MO. In this paper, a potential photocatalytic mechanism has been proposed.
非金属掺杂是提高ZnO光响应范围的有效方法。然而，通过非金属掺杂改善ZnO光响应范围的机制尚不清楚。在此，通过离子交换和煅烧方法成功制备了S掺杂的ZnO，使得硫离子在ZnO中均匀分布。通过XPS确定，掺杂的S元素主要为S和S。我们利用表面光电压谱研究了S对ZnO光生电荷特性的影响。结果表明，S掺杂剂的均匀分布通过将S 3p与ZnO的上价带态混合，提高了价带最大值。S-ZnO的价带最大值比ZnO高0.37 eV。这一结果是光响应改善的主要原因。我们还研究了Ag/S-ZnO的光催化活性。负载10 wt% Ag的Ag/S-ZnO对亚甲基蓝显示出最高的光催化降解率。本文提出了一种潜在的光催化机理。
