Zhang Xiuxiu, Yi Guiyun, Li Peng, Zheng Xiaomeng, Shen Xuhang, Ning Kunlei, Chen Lunjian, Zhang Chuanxiang, Zhang Yulong, Sun Qi
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
Collaborative Innovation Center of Coal Work Safety of Henan Province, Jiaozuo, 454003, China.
Environ Sci Pollut Res Int. 2022 Apr;29(16):23094-23103. doi: 10.1007/s11356-021-17286-9. Epub 2021 Nov 19.
The superior photocatalytic activity of semiconductor-based photocatalytic materials has attracted great attention. In this work, a series of novel AgPO/g-CN (APO/CNx) composites with the Z-scheme structure were fabricated through a facile precipitation method. B naphthol, a typical phenolic compound, was selected to evaluate the photocatalytic activity of all as-prepared photocatalysts. The obtained APO/CNx composites exhibited excellent photocatalytic activity for degradation of B naphthol under visible-light irradiation. Experimental results showed that the degradation rate toward B naphthol could reach to 90.5% for 180 min, which was almost 3.66 times higher than pure g-CN, indicating that the presence of nitrogen vacancies and Z-scheme structure could efficiently improve the photocatalytic performance of pure g-CN. Furthermore, the results of trapping experiments and electron spin resonance (ESR) spectroscopy manifest that •O and •OH radicals were the predominant active substances for B naphthol degradation, and the possible mechanism of improved photocatalytic performance was elucidated. This work will provide an innovative perspective for constructing Z-scheme photocatalysts for the application of photocatalytic in the field of wastewater treatment.
基于半导体的光催化材料优异的光催化活性引起了极大关注。在本工作中，通过简便的沉淀法制备了一系列具有Z型结构的新型AgPO/g-CN（APO/CNx）复合材料。选择典型酚类化合物β-萘酚来评估所有制备的光催化剂的光催化活性。所制备的APO/CNx复合材料在可见光照射下对β-萘酚的降解表现出优异的光催化活性。实验结果表明，180分钟内对β-萘酚的降解率可达90.5%，几乎是纯g-CN的3.66倍，表明氮空位和Z型结构的存在可有效提高纯g-CN的光催化性能。此外，捕获实验和电子自旋共振（ESR）光谱结果表明，•O和•OH自由基是β-萘酚降解的主要活性物质，并阐明了光催化性能提高的可能机制。这项工作将为构建用于光催化废水处理领域的Z型光催化剂提供创新视角。
