Construction of a novel Ag/Ag3PO4/MIL-68(In)-NH2 plasmonic heterojunction photocatalyst for high-efficiency photocatalysis. (28th February 2022)

• Record Type: Journal Article
• Authors: Mu, Feihu; Dai, Benlin; Zhao, Wei; Zhou, Shijian; Huang, Haibao; Yang, Gang; Xia, Dehua; Kong, Yan; Leung, Dennis Y.C.
• Is Part Of: Journal of materials science & technology. Volume 101(2022)
• Page Start: 37
• Page End: 48
• Publication Date: 2022-02-28
• Subjects: Photocatalysis -- Localized surface plasmon resonance -- Z-scheme -- MOFs -- Ag3PO4; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.05.059
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: Ag/Ag3 PO4 /MIL-68(In)-NH2 photocatalyst was constructed for the first time. This photocatalyst showed excellent activity for BPA degradation and Cr(VI) reduction. Characterizations and simulations proved the plasmonic Z -scheme photocatalytic mechanism. The high activity was caused by a large specific surface area, LSPR, and Z -scheme system. Abstract: To boost the visible light catalytic performance of typical metal-organic frameworks (MOFs) materials (MIL-68(In)-NH2 ), a novel stable Z-scheme Ag/Ag3 PO4 /MIL-68(In)-NH2 plasmonic photocatalyst was constructed by electrostatic attraction, co-precipitation reaction, and in-situ photoreduction reaction methods for the first time. The photocatalytic activities of the photocatalysts are systematically explored by the photocatalytic degradation of bisphenol A (BPA) and reduction of Cr(VI) under visible light. Ag/Ag3 PO4 /MIL-68(In)-NH2 displays the best photocatalytic performance among the as-prepared photocatalysts. The rate constant of BPA degradation on Ag/Ag3 PO4 /MIL-68(In)-NH2 is 0.09655 min −1, which is better than many reported photocatalytic materials. It also achieved a maximum rate constant of 0.02074 min −1 for Cr(VI) reduction. The boosted photocatalytic performance is due to the improved absorption caused by localized surface plasmon resonance (LSPR), effective interface charge transfer and separation, and more reactive sites provided by the large specific surface area. Besides, the photocatalytic degradation pathway of BPA is concluded according to GC-MS analysis. Finally, a more reasonable Z -scheme mechanism is speculated and verified through a series of characterizations and simulations, such as time-resolved photoluminescence spectroscopy (TRPL), electron spin resonance (ESR), and finite difference time domain (FDTD) method.