异质结
材料科学
光催化
三元运算
降级(电信)
可见光谱
纳米颗粒
电子转移
载流子
化学工程
光电子学
纳米技术
光化学
催化作用
电信
生物化学
计算机科学
工程类
化学
程序设计语言
作者
Kai Wang,Jun Li,Gaoke Zhang
标识
DOI:10.1021/acsami.9b05074
摘要
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.
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