研究目的
To improve the catalytic performance of CeO2 by preparing GQDs/CeO2 composites for the photocatalytic degradation of Rhodamine B (RhB) under visible light.
研究成果
The GQDs/CeO2 composites exhibited significantly enhanced photocatalytic activity under visible light, with the GQDs-4.5/CeO2 composite showing the highest performance. The improved activity is attributed to the effective separation of electron-hole pairs, prolonged carrier lifetime, and the formation of a heterogeneous structure with staggered energy levels. This study demonstrates the potential of GQDs/CeO2 composites as efficient photocatalysts for environmental remediation applications.
研究不足
The study does not extensively explore the long-term stability and recyclability of the GQDs/CeO2 composites under various environmental conditions. Additionally, the mechanism behind the morphological changes induced by GQDs on CeO2 is not fully elucidated.
1：Experimental Design and Method Selection:
The study involved the preparation of GQDs/CeO2 composites via a one-step hydrothermal method to enhance the photocatalytic performance of CeO
2：Sample Selection and Data Sources:
GQDs were prepared from three-dimensional network graphene by a 'top-down' method, and CeO2 was used as the semiconductor material.
3：List of Experimental Equipment and Materials:
Equipment included a PTFE-lined high-pressure reactor, Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and UV-Vis spectrophotometer. Materials included expanded graphite, CeO2, and various chemicals for synthesis.
4：Experimental Procedures and Operational Workflow:
The process involved the synthesis of GQDs, preparation of GQDs/CeO2 composites, characterization of materials, and photocatalytic performance testing under visible light.
5：Data Analysis Methods:
The photocatalytic activity was evaluated by measuring the degradation rate of RhB under visible light, and the kinetics of the photocatalytic process were analyzed.
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Transmission Electron Microscopy
Hitachi-7650
HITACHI
Used for characterizing the morphology and microstructure of materials.
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UV-Vis spectrophotometer
UV-2550
Shimadzu
Used for measuring the absorption range of photocatalyst to light.
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Photoluminescence spectrometer
FluoroMax-4
HORIBA
Used for testing the photoluminescence of the material.
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PTFE-lined high-pressure reactor
Used for hydrothermal synthesis of materials.
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Fourier Transform Infrared Spectroscopy
EQUINOX55
Used for characterizing the infrared absorption characteristics of materials.
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X-Ray Photoelectron Spectroscopy
PHI5702
American Physical Electronics Company
Used for precise analysis of the qualitative, quantitative, chemical valence and valence states of elements.
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Scanning Electron Microscopy
ZEISS
Used for characterizing the intuitive morphology of materials.
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Electrochemical workstation
CHI660E
Shanghai Chenhua
Used for electrochemical measurements.
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Photocatalytic reactor
LY-GHX-Xe-300
Shanghai Lanyi
Used for photocatalytic performance testing of materials.
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Xenon lamp
HSX-F300
Beijing Newbit Technology Co., Ltd.
Used as a light source for photocatalytic reactions.
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