School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China.
College of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng 224002, PR China.
J Colloid Interface Sci. 2022 Mar;609:23-32. doi: 10.1016/j.jcis.2021.11.135. Epub 2021 Nov 24.
Photocatalysis technology has been considered as a sustainable and promising strategy for pollutant degradation. However, the photocatalytic activity is limited by the unsatisfactory carrier separation efficiency of photocatalysts and insufficient reactive oxygen species. Herein, the oxygen vacancies (OVs) mediated BiOCl ultra-thin nanobelt (ROV BiOCl) was fabricated via solvothermal method. The surface oxygen vacancies can act as the 'electron sink' and boost charge separation. Thus, the ROV BiOCl shows superior photocatalytic performance, which is 2.72 and 4.52 times compared to deficient oxygen vacancies BiOCl (DOV BiOCl) and Bulk BiOCl for colored organic pollutants degradation, respectively. Besides, the ROV BiOCl also displays excellent removal efficiency for refractory antibiotics, roughly 4.00 and 7.45 times compared to that of DOV BiOCl and Bulk BiOCl, respectively. Furthermore, the intermediates for photocatalytic degradation were determined through HPLC-MS and the possible degradation paths of the target molecules were inferred. Capture experiment and ESR spectra confirmed that the O played a vital role for the organic pollutant degradation. This work provides a new perspective for the design of advanced semiconductors for organic pollutants degradation.
光催化技术被认为是一种可持续且有前途的污染物降解策略。然而，光催化活性受到光催化剂载体分离效率不理想和反应性氧物种不足的限制。在此，通过溶剂热法制备了氧空位（OVs）介导的 BiOCl 超薄纳米带（ROV BiOCl）。表面氧空位可以作为“电子阱”，促进电荷分离。因此，ROV BiOCl 表现出优异的光催化性能，对于有色有机污染物的降解，其活性分别是缺少氧空位 BiOCl（DOV BiOCl）和体相 BiOCl 的 2.72 倍和 4.52 倍。此外，ROV BiOCl 对难降解抗生素的去除效率也很高，分别是 DOV BiOCl 和体相 BiOCl 的 4.00 倍和 7.45 倍。此外，通过 HPLC-MS 确定了光催化降解的中间产物，并推断了目标分子的可能降解途径。捕获实验和 ESR 光谱证实，O 在有机污染物降解中起着至关重要的作用。这项工作为设计用于有机污染物降解的先进半导体提供了新的视角。
