Enhanced visible light photocatalytic activity and stability of CQDs/BiOBr composites: The upconversion effect of CQDs

被引：102
作者：
Duo, Fangfang [1 ]
Wang, Yawen [1 ]
Fan, Caimei [1 ]
Zhang, Xiaochao [1 ]
Wang, Yunfang [1 ]
机构：
[1] Taiyuan Univ Technol, Coll Chem & Chem Engn, Taiyuan 030024, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 685卷
基金：
中国国家自然科学基金;
关键词：
Upconversion; CQDs/BiOBr composites; Oxygen vacancies; Photocatalytic activity; CARBON QUANTUM DOTS; MOLECULAR-OXYGEN ACTIVATION; BIOBR; NANOSHEETS; NANOCOMPOSITES; PERFORMANCE; BR; CL; DEGRADATION; FABRICATION;
D O I：
10.1016/j.jallcom.2016.05.259
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
CQDs/BiOBr composites with oxygen vacancies were synthesized by a simple hydrolysis method at room temperature. The obtained composites exhibited much higher photocatalytic activity and stability than pure BiOBr under visible light. The upconversion effect of CQDs on BiOBr was studied by photoluminescence (PL) spectra, transient photocurrent (PC) responses measurements, electron spin resonance (ESR) analysis, reactive species scavenger experiments, and RhB and BPA degradation under monochromatic light irradiation. The results demonstrated that the upconversion effect of CQDs could improve O-center dot(2)- formation on BiOBr during photocatalytic process via more electron transfer in oxygen vacancies owing to the desirable long wavelength visible light and near infrared (NIR) light absorption property of CQDs. Moreover, the upconversion effect of CQDs could refresh the oxygen vacancies on BiOBr and therefore maintain the photocatalytic stability of BiOBr. (C) 2016 Published by Elsevier B.V.
引用
收藏
页码：34 / 41
页数：8
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