Ag-Bridged Z‑Scheme 2D/2D Bi5FeTi3O15/g-C3N4 Heterojunction for Enhanced Photocatalysis: Mediator-Induced Interfacial Charge Transfer and Mechanism Insights

• Published in: ACS applied materials & interfaces Vol. 11; no. 31; pp. 27686 - 27696
• Main Authors: Wang, Kai, Li, Jun, Zhang, Gaoke
• Format: Journal Article
• Language: English
• Published: American Chemical Society 07.08.2019
• Subjects: absorption; carbon nitride; density functional theory; light; mass spectrometry; nanosheets; nanosilver; photocatalysis; photocatalysts; solar radiation; tetracycline; ultrasonics; DFT study; Z-scheme; Bi5FeTi3O15; ultrathin g-C3N4; bridged Ag nanoparticles
• ISSN: 1944-8244; 1944-8252; 1944-8252
• DOI: 10.1021/acsami.9b05074

Heterojunction photocatalysts have attracted widespread interest in photocatalysis because of their high-efficiency interfacial charge-transfer characteristics of nanoarchitectures. In this study, Ag-bridged 2D/2D Bi5FeTi3O15/ultrathin g-C3N4 Z-scheme heterojunction photocatalysts with powerful interfacial charge transfer has been synthesized via a facile ultrasound method coupled with a photoreduction strategy for efficient photocatalytic degradation of antibiotics. The morphology analysis displays that the bridged Ag nanoparticles were anchored on the interface of layered Bi5FeTi3O15 and ultrathin g-C3N4 nanosheets. Owing to its unique 2D/2D ternary heterostructure, the Bi5FeTi3O15/2%Ag/10% ultrathin g-C3N4 composite exhibited the best tetracycline degradation performance under visible-light and simulated solar irradiation. Meanwhile, the intermediates and degradation pathways were proposed by a liquid-phase mass spectrometry system. Characterizations and density functional theory studies together verify that the matched band structure of Bi5FeTi3O15 and g-C3N4 could induce a superfast Z-scheme interfacial charge-transfer path. More importantly, bridged Ag nanoparticles in the 2D/2D heterojunction extended the light absorption range and prolonged the lifetime of photogenerated electron–holes induced by Bi5FeTi3O15. This work affords a promising approach for designing multicomponent Z-scheme heterojunction photocatalysts for highly efficient photocatalytic application.