Fabrication of ternary UiO-66(Ce)/Ag/BiOBr heterojunction for enhanced photocatalytic degradation of ketoprofen via effective electron transfer process: Pathways, DFT calculation and mechanism. (October 2022)

• Record Type: Journal Article
• Authors: Zheng, Xiaoni; Han, Rui; Jiang, Xinyu; Mei, Jie; Gao, Yinuo; Yang, Jing; Li, Yafei; Cui, Shihai
• Is Part Of: Chemosphere. Volume 305(2022)
• Publication Date: 2022-10
• Subjects: Metal-organic frameworks -- Photodegradation -- Mechanism -- Ketoprofen -- DFT calculation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.135352
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Photocatalytic oxidation technique is considered as one of the most prospective approaches to solve the problem of environmental pollution. Herein, the novel ternary nanocomposite UiO-66(Ce)/Ag/BiOBr was fabricated via simple synthetic strategy. The obtained UiO-66(Ce)/Ag/BiOBr exhibited an excellent performance and photocatalytic efficiency of ketoprofen reached 93.5% after 180 min illumination. The ·OH and ·O2 - were main active species and play an important role during the photocatalytic reaction. Furthermore, intermediate products and degradation pathways of ketoprofen were analyzed based on the 3D-EEM, DFT calculation and LC-MS. The possible reaction mechanism was proposed as follows: (1) the successful construction of heterojunction broadened the light absorption range to the visible light region; (2) the design of Ce-based MOFs provided more chances for electron transfer due to the Ce 4+ /Ce 3+ cycling; (3) the combination of plasmon resonance effect, Schottky junction and effect of Ag bridge was an important strategy to accelerate charge transfer and improve photocatalytic efficiency. Graphical abstract: Image 1 Highlights: Novel ternary nanocomposite UiO-66(Ce)/Ag/BiOBr has been successfully synthesized. UiO-66(Ce)/Ag/BiOBr has excellent catalytic performance for ketoprofen degradation. The design of Ce-based MOFs provided more chances for e − -h + transfer. The combined action of SPR, Schottky junction and Ag bridge promoted e − migration. The possible degradation pathway and reaction mechanism were proposed.