Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, College of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, 8 Jiangwangmiao street, Nanjing, 210042, China.
Chemosphere. 2020 Oct;257:127123. doi: 10.1016/j.chemosphere.2020.127123. Epub 2020 May 18.
It is a central issue to improve the separation efficiency of photogenerated charge carriers and the utilization of visible light in the field of photocatalysis. Herein, taking MIL-125(Ti) as a host material, the Pt/MIL-125(Ti) was first prepared by solvothermal method to build the interface of Schottky junction. Ag was then introduced onto the surface of Pt/MIL-125(Ti) to form the interface with the surface plasmon resonance effect. These double interfaces in the composite play a synergistic role on the photodagradation. The morphology, crystallinity and photochemical properties of the material were tested. By comparison, Pt/MIL-125(Ti)/Ag (4 wt% Ag) exhibited the best performance in the photodegradation of ketoprofen (KP, 10 mg/L) and the degradation process conformed to the pseudo-first-order kinetics. The photodegradation rate is 0.0253 min, which was higher than MIL-125(Ti) (0.0009 min). The TOC removal efficiency of KP reached approximately 51.5%. The electron paramagnetic resonance (EPR) and free radical capture tests verified that h and ·OH played the prominent roles during the reaction system. The degradation process, possible pathways and reaction mechanism were proposed. The design of the double interfaces between semiconductor and noble metals is a novel strategy to enhance the photocatalytic performance.
提高光生载流子的分离效率和可见光在光催化领域的利用率是一个核心问题。在此，以 MIL-125(Ti) 为主体材料，首先通过溶剂热法制备了 Pt/MIL-125(Ti)，以构建肖特基结界面。然后在 Pt/MIL-125(Ti) 的表面引入 Ag，形成具有表面等离子体共振效应的界面。在复合材料中，这两个界面在光催化降解过程中发挥协同作用。对材料的形貌、结晶度和光化学性质进行了测试。相比之下，Pt/MIL-125(Ti)/Ag(4 wt%Ag) 在酮洛芬(KP，10mg/L)的光降解中表现出最佳性能，降解过程符合准一级动力学。光降解速率为 0.0253 min，高于 MIL-125(Ti)(0.0009 min)。KP 的 TOC 去除效率达到约 51.5%。电子顺磁共振(EPR)和自由基捕获试验验证了在反应体系中 h 和·OH 发挥了突出作用。提出了降解过程、可能的途径和反应机制。半导体与贵金属之间的双界面设计是提高光催化性能的一种新策略。
