Self-photoreduced Ag0-doped Ag(i)–organic frameworks with efficient visible-light-driven photocatalytic performance

• Published in: CrystEngComm 2021-01, Vol.23 (42), p.7496-7501
• Main Authors: Liu, Bo, Lv, Mengying, Jiang, Wei, Gao, Baihui, Li, Yuxin, Zhou, Shi, Wang, Dandan, Liu, Chunbo, Che, Guangbo
• Format: Article
• Language: English
• Subjects: Dyes; Electron paramagnetic resonance; Electron spin; Metal-organic frameworks; Photocatalysis; Photocatalysts; Photodegradation; Photoelectric effect; Plasmonics; Room temperature; Spin resonance; Ultraviolet radiation
• ISSN: 1466-8033
• DOI: 10.1039/d1ce01133b

To investigate the facile synthesis strategy for MOF-based plasmonic photocatalysts, an Ag(i)–organic framework [Ag3(psa)(4,4′-bpy)3]·OH·2CH3OH·2H2O (JLNU-91) was prepared by employing phenylsuccinic acid (H2psa) and 4,4′-bipyridine (4,4′-bpy) under room temperature. Under the irradiation of UV light, the separated Ag(i) sites in the framework can be reduced to metallic Ag0, producing a series of Ag0-doped JLNU-91/x. The photocatalytic experiments indicate that the JLNU-91/x samples display improved photocatalytic activities for the degradation of methyl orange (MO) and the optimal JLNU-91/1 has a 2.2 times higher degradation kinetic constant than pure JLNU-91. The photocurrent responses and EIS plots demonstrate that the SPR effect of the self-reduced Ag0 promotes the separation of photoinduced electron–hole pairs. Moreover, the electron spin resonance (ESR) spectra and capture experiments reveal that O2−, ·OH and the holes play important roles in the photodegradation of MO. This work brings a new insight into the development of MOF-based plasmonic photocatalysts.