Wang Anhu, Liang Huagen, Chen Fu, Tian Xinlong, Jing Shengyu, Tsiakaras Panagiotis
Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221008, China.
Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China; School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221008, China; Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510640, China.
Chemosphere. 2022 Nov;307(Pt 1):135699. doi: 10.1016/j.chemosphere.2022.135699. Epub 2022 Jul 13.
Photocatalysis is considered an economical, environmentally friendly, and effective technology for removing pollutants. The construction of Z-Scheme heterojunctions has been identified as one of the feasible solutions capable of enhancing the photocatalytic activity. Herein, a series of visible light responsive photocatalysts (NiInS/UiO-66 composites) with excellent activity and stability were prepared by using a solvothermal process. It is found that 20 mg L of tetracycline (TC) could be almost completely degraded under visible light irradiation within 1 h, when the mass ratio of NiInS to UiO-66 is 0.5:1 (NISU-0.5) and the solution pH = 11. In addition, after six cycles, the degradation rate of tetracycline photocatalyzed by NISU-0.5 still reach up to 90%. Ultraviolet photoelectron spectra (UPS), X-ray photoelectron spectra (XPS) and electron spin resonance measurements (ESR) confirm the formation of the Z-Scheme heterostructure between NiInS and UiO-66. The synergistic effect between built-in electric field, energy band bending and coulomb interactions in interface of Z-Scheme heterojunction is conducive to restrain the recombination of photogenerated electrons and holes, which greatly improve the photocatalytic activity. In conclusion, this study offers a new thought for design and synthesis of Z-Scheme heterojunctions and provides a cost-effective strategy for solving environmental pollution and energy problems in the future.
光催化被认为是一种经济、环保且有效的污染物去除技术。Z型异质结的构建已被确定为能够提高光催化活性的可行解决方案之一。在此，通过溶剂热法制备了一系列具有优异活性和稳定性的可见光响应光催化剂（NiInS/UiO-66复合材料）。研究发现，当NiInS与UiO-66的质量比为0.5:1（NISU-0.5）且溶液pH = 11时，20 mg/L的四环素（TC）在可见光照射下1小时内几乎可完全降解。此外，经过六个循环后，NISU-0.5光催化四环素的降解率仍高达90%。紫外光电子能谱（UPS）、X射线光电子能谱（XPS）和电子自旋共振测量（ESR）证实了NiInS与UiO-66之间形成了Z型异质结构。Z型异质结界面处的内建电场、能带弯曲和库仑相互作用之间的协同效应有利于抑制光生电子和空穴的复合，从而大大提高了光催化活性。总之，本研究为Z型异质结的设计与合成提供了新思路，并为未来解决环境污染和能源问题提供了一种经济有效的策略。
