Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 685, Issue -, Pages 34-41Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.05.259
Keywords
Upconversion; CQDs/BiOBr composites; Oxygen vacancies; Photocatalytic activity
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Funding
- National Natural Science Foundation of China [21176168, 21303116]
- Shanxi Province Science Foundation [2013021011-2]
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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.
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