期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 353, 期 -, 页码 10-18出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2017.10.049
关键词
CDs; TiO2; ZnFe2O4; Rhodamine; Charge separation
资金
- National Natural Science Foundation of China [21377031, 21677040]
- Natural Science Foundation of Guangdong Province, China [2016A030313697]
- Innovative Team Program of High Education of Guangdong Province [2015KCXTD007]
- Science and Technology Planning Project of Guangdong Province [2017A050506052]
- Education Department of Henan Province [13A610528]
In this study, a novel and highly efficient ternary photocatalytic ZnFe2O4/TiO2/CDs nanocomposite was successfully synthesized by a hydrothermal method. The properties and structures of the samples were characterized by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared spectrometry (FT-IR), and photoluminescence spectrum (PL). The UV-vis diffuse reflectance spectrum was used to demonstrate that carbon quantum dots could increase the absorption of visible light wavelengths. When compared with TiO2/3.00 wt%CDs and ZnFe2O4/TiO2 nanocomposites, the ternary photocatalysts exhibited the enhanced photocatalytic activity under solar-spectrum irradiation. A low CDs content of 3.00 wt% in the ternary photocatalysts possessed excellent performance in the decomposition of Rhodamine B (RhB). Act as donator and receiver, CDs can efficiently improve the ability of electron transfer and separate the electron-hole pairs. (OH)-O-center dot and O-2(center dot-) were confirmed to be involved in the photocatalytic degradation of RhB base on the Electron spin resonance (ESR) tests, and the photocatalytic mechanism of the ZnFe2O4/TiO2/3.00 wt%CDs was proposed. After four sequential operational cycles, the ZnFe2O4/TiO2/CDs maintained its photocatalytic efficiency, indicating its high photocatalytic stability. Therefore, our results provide a high efficient photocatalytic nanocomposite that synthetized by a facile method, and have implications in the removal of environmental persistent pollutants under ternary photocatalysts mediated solar degradation (C) 2017 Elsevier B.V. All rights reserved.
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