Wang Min, Tan Guoqiang, Feng Shuaijun, Dang Mingyue, Wang Yong, Zhang Bixin, Ren Huijun, Lv Long, Xia Ao, Liu Wenlong, Liu Yun
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China.
J Hazard Mater. 2021 Apr 15;408:124897. doi: 10.1016/j.jhazmat.2020.124897. Epub 2020 Dec 25.
In this work, g-CN/BiOCl/WO heterojunction with "N-O" vacancies was prepared using NaBiO and WCl as raw materials and non-metal plasma of WO grew in-situ on the surface of BiOCl, resulting in the enhanced photocatalytic NO deep oxidation. XPS tests and DFT calculation indicated the formation of internal electric fields from g-CN to BiOCl, BiOCl to WO, which induced the transition from Ⅱ-Ⅱ-type to double Z-scheme hetero-structure. High separation efficiency, prolong lifetime and strong redox ability of photo-generated electron-hole pairs were simultaneously achieved due to the charge capture effect of defects and double Z-scheme mechanism. Therefore, g-CN/BiOCl/WO exhibited the significantly increased NO removal rates from 21.17% (BiOCl/WO) and 36.52% (g-CN) to 68.70% and the main oxidation product of NO was NO. This study revealed that the carrier dynamics of heterojunction photocatalysts could be optimized by the synergistic effect of defects and internal electric fields to achieve photocatalytic NO deep oxidization.
在本工作中，以NaBiO和WCl为原料制备了具有“N-O”空位的g-CN/BiOCl/WO异质结，WO的非金属等离子体在BiOCl表面原位生长，从而增强了光催化NO深度氧化性能。XPS测试和DFT计算表明，从g-CN到BiOCl、从BiOCl到WO形成了内电场，促使其从Ⅱ-Ⅱ型异质结构转变为双Z型异质结构。由于缺陷的电荷捕获效应和双Z型机制，光生电子-空穴对同时实现了高分离效率、长寿命和强氧化还原能力。因此，g-CN/BiOCl/WO的NO去除率从21.17%（BiOCl/WO）和36.52%（g-CN）显著提高到68.70%，NO的主要氧化产物为NO₂。该研究表明，通过缺陷和内电场的协同作用可以优化异质结光催化剂的载流子动力学，以实现光催化NO深度氧化。
