光催化
罗丹明B
材料科学
表面等离子共振
可见光谱
肖特基势垒
光化学
兴奋剂
化学工程
带隙
催化作用
载流子
分析化学(期刊)
X射线光电子能谱
光电子学
纳米技术
纳米颗粒
化学
有机化学
工程类
二极管
作者
Qiangshun Wu,Siqi Chai,Hanpei Yang,Zhao Gao,Ruichen Zhang,Lina Wang,Kang Li
标识
DOI:10.1016/j.seppur.2020.117388
摘要
Abstract A novel composite photocatalyst of Bi/BiOBr-Bi5+ was successfully developed via a facile two-step procedure. The co-existence of self-doped Bi5+ and in-situ deposited Bi(M) was evidenced by X-ray diffraction, field-emission transmission electron microscope and X-ray photoelectron spectra. Its photocatalytic performance on the Rhodamine B (RhB) degradation under visible light irradiation displayed a significant improvement compared with that of Bi/BiOBr or BiOBr-Bi5+, which was mainly attributed to the synergistic effect between Bi(M) and Bi5+. For Bi(M), enhancement of visible-light absorption capacity was beneficial from surface plasmon resonance (SPR) effect while the promoted separation of photoinduced charge carriers was attributed to the formation of oxygen vacancies (OVs) and Schottky-barrier. Besides, Bi(M) induced a predominant exposure of (0 1 0) facet, further enhancing photocatalytic performance. Differently, Bi5+ brought a narrowed bandgap of BiOBr in increasing the carrier density. A plausible mechanism towards RhB degradation was proposed based on analysis of electron transfer pathway and determination of dominant active species. The work offers new routes to enhance the photocatalytic performance of Bi-based materials without introducing any impurities.
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