表面等离子共振
光降解
光催化
催化作用
材料科学
化学工程
密度泛函理论
贵金属
降级(电信)
等离子体子
纳米颗粒
肖特基势垒
光化学
化学
纳米技术
有机化学
计算化学
光电子学
二极管
工程类
电信
计算机科学
作者
Min Zhao,Yafei Li,Chen Shen,Sen Chen,Jing Yang
标识
DOI:10.1016/j.apsusc.2022.154980
摘要
The noble metal nanoparticles (NMNPs) in different chemical environments have different catalytic activities. The photocatalytic degradation ability of NMNPs was improved obviously by the combination with metal-organic frameworks (MOFs). By adjusting the metal center, the MOFs have the different chemical state and properties, further influence the photodegradation of the NMNPs. In this work, Pt/MIL-53(Al, Cr or Fe) composites were synthesized by a deposition method. The morphology, structure and photoelectric properties of the materials were systematically characterized and compared. The degradation experiments of ketoprofen showed that the catalytic activity was Pt/MIL-53(Al) > Pt/MIL-53(Cr) > Pt/MIL-53(Fe). The degradation pathways and intermediates of ketoprofen were analyzed by density functional theory (DFT) calculations and liquid chromatography-mass spectrometry (LC-MS). Through energy band structure and trap experiments, the synergistic effect of Schottky junctions and localized surface plasmon resonance (LSPR) was found. Under simulated sunlight, Pt NPs can both inject hot electrons into MIL-53 and capture electrons transferred from MIL-53. In addition, the structure-activity relationship of materials was firstly discussed via textural and optoelectronic properties. The full utilization of active sites and e−-h+ pairs is the key to improving the photocatalytic activity of the materials.
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