Wang Xiaoxia, Li Xueting, Wang Xinyu, Zhao Man, Chen Wenwen, Wu Haishun, Jia Jianfeng
Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, School of Chemical and Material Science, Shanxi Normal University, Taiyuan 030006, PR China; Department of Chemistry, Changzhi University, Changzhi 046011, PR China.
Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, School of Chemical and Material Science, Shanxi Normal University, Taiyuan 030006, PR China.
Int J Biol Macromol. 2022 May 1;206:398-408. doi: 10.1016/j.ijbiomac.2022.02.159. Epub 2022 Mar 1.
Semiconductor photocatalysis is considered to be an important green technology for sewage treatment. However, most of the pollutant degradation studies used simulated sunlight in a laboratory, which has great energy cost with limited applications in industry. Herein, cellulose nanocrystal (CNC) with rich hydroxyl groups and high specific surface area are used as the matrix to construct composites with BiOCl, which improves the dispersibility with an increased number of oxygen vacancies on BiOCl. The obtained composite photocatalyst, i.e., BiOCl/CNC, showed an excellent performance with good recyclability. Within 30 min, 99% of RhB (20 mg/L) was degraded under simulated visible light and 94% under natural sunlight. The reaction system maintains excellent catalytic performance after being scaled up by 10×. Compared with reported BiOCl-based composites in literature, BiOCl/CNC had excellent photocatalytic activity for the RhB degradation with good recyclability. Subsequently, by identifying the active species, a reasonable photocatalytic mechanism was proposed for RhB degradation. This work developed an economical and effective visible light sensitive photocatalyst for the treatment of organic dyes in water.
半导体光催化被认为是一种用于污水处理的重要绿色技术。然而，大多数污染物降解研究在实验室中使用模拟太阳光，这具有巨大的能源成本且在工业中的应用有限。在此，具有丰富羟基和高比表面积的纤维素纳米晶体（CNC）被用作基质来构建与BiOCl的复合材料，这提高了分散性并增加了BiOCl上的氧空位数量。所获得的复合光催化剂，即BiOCl/CNC，表现出优异的性能和良好的可回收性。在30分钟内，在模拟可见光下99%的RhB（20mg/L）被降解，在自然阳光下为94%。反应体系在放大10倍后仍保持优异的催化性能。与文献中报道的基于BiOCl的复合材料相比，BiOCl/CNC对RhB降解具有优异的光催化活性和良好的可回收性。随后，通过识别活性物种，提出了一种合理的RhB降解光催化机理。这项工作开发了一种经济有效的可见光敏感光催化剂用于处理水中的有机染料。
