期刊
APPLIED SURFACE SCIENCE
卷 448, 期 -, 页码 655-661出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.04.145
关键词
SnO2; Graphene quantum dots; Photocatalytic oxidation of NO; Visible light response; Charge separation
类别
资金
- National Natural Science Foundation of China [21403172]
- Innovative Research Team of Sichuan Province [2016TD0011]
- Sichuan Provincial Education Department Project [15ZB0055]
- Scientific Research Starting Project of SWPU [2015QHZ018]
- Young Scholars Development Fund of SWPU [201499010096]
In the present work, we have prepared tin oxide (SnO2)/graphene quantum dots (GQDs) composites and applied them for photocatalytic removal of nitric oxide (NO). In contrast to SnO2 alone, SnO2/GQDs composite has exhibited a remarkably enhanced activity under both full spectrum and visible light illumination. The crystal structure, morphology and surface state of the composite were studied by X-ray diffraction, transmission electron microscopy, Fourier-transformed infrared spectroscopy and X-ray photoelectron spectroscopy. Moreover, diffraction and reflectance spectra and photoluminescence spectra together with the photoelectrochemical tests show that the presence of GQDs in the composite could promote the visible light response as well as charge separation efficiency of the system. This makes SnO2 /GQDs composite generate more active species (center dot O-2 and center dot OH) for NO oxidation, as evidenced from the electron paramagnetic resonance measurements. This study hence could be referenced for future construction of efficient photocatalytic systems with wide bandgap oxides. (C) 2018 Elsevier B.V. All rights reserved.
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