研究目的
To fabricate hierarchical sheet-on-sheet WO3/g-C3N4 composites with enhanced photocatalytic activity for the degradation of pollutants under simulated sunlight irradiation.
研究成果
The hierarchical sheet-on-sheet WO3/g-C3N4 composites exhibited significantly enhanced photocatalytic activity for RhB degradation under simulated sunlight irradiation, attributed to the hierarchical heterostructure that provided larger specific surface area, better visible-light absorption capability, and enhanced separation efficiency of charge carriers. A Z-scheme photocatalytic mechanism was proposed based on active species trapping experiments.
研究不足
The study focuses on the photocatalytic degradation of RhB under simulated sunlight irradiation, and the applicability to other pollutants or under different light conditions was not explored. The scalability and practical application of the synthesis method may require further investigation.
1：Experimental Design and Method Selection:
The study employed a simple calcination method using acid-treated SrWO4/g-C3N4 as precursors to fabricate WO3/g-C3N4 composites.
2：Sample Selection and Data Sources:
g-C3N4 was synthesized from melamine, and SrWO4/g-C3N4 precursor was prepared by an in-situ precipitation method.
3：List of Experimental Equipment and Materials:
Materials included melamine, strontium nitrate, sodium tungstate dihydrate, rhodamine B, nitric acid, and ethanol absolute. Equipment included a Perkin Elmer Simultaneous Thermal Analyzer, X-ray diffractometer, Fourier transform infrared spectrophotometer, X-ray photoelectron spectroscopy instrument, scanning electron microscope, UV-vis spectrophotometer, fluorescence spectrometer, and electrochemical workstation.
4：Experimental Procedures and Operational Workflow:
The synthesis involved exfoliation of g-C3N4, preparation of SrWO4/g-C3N4 precursor, acid treatment, and calcination to produce WO3/g-C3N4 composites. Photocatalytic activity was evaluated by degrading RhB under simulated sunlight irradiation.
5：Data Analysis Methods:
The photocatalytic performance was analyzed by monitoring the concentration of RhB solution using a spectrophotometer, and the dynamics of RhB degradation was fitted by a first-order model.
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Perkin Elmer Simultaneous Thermal Analyzer
STA 8000
Perkin Elmer
Thermogravimetric analysis of samples
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X-ray diffractometer
D8 ADVANCE
Bruker
Analysis of crystal forms of composite photocatalysts
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Scanning electron microscope
Hitachi SU8220 Field emission
Hitachi
Morphological observation of samples
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UV-vis spectrophotometer
Hitachi UV-3010
Hitachi
Recording UV-vis diffuse reflectance spectra
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Fluorescence spectrometer
Hitachi F-4500
Hitachi
Measurement of photoluminescence spectra
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Electrochemical workstation
CHI 660B Chenhua
CHI
Photoelectrochemical measurement
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Melamine
Aladdin Chemistry Co. Ltd
Precursor for the synthesis of g-C3N4
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Strontium nitrate
Aladdin Chemistry Co. Ltd
Used in the synthesis of SrWO4/g-C3N4 precursor
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Sodium tungstate dihydrate
Aladdin Chemistry Co. Ltd
Used in the synthesis of SrWO4/g-C3N4 precursor
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Rhodamine B
Sinopharm Chemical Reagent Co., Ltd
Pollutant used to evaluate photocatalytic activity
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Nitric acid
Sinopharm Chemical Reagent Co., Ltd
Used for acid treatment of SrWO4/g-C3N4 precursor
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Ethanol absolute
Sinopharm Chemical Reagent Co., Ltd
Used in the washing process of synthesized materials
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Fourier transform infrared spectrophotometer
Nicolet Avatar 370
Nicolet
Recording FT-IR spectra of samples
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X-ray photoelectron spectroscopy instrument
Phi X-tool
Phi
Chemical composition and surface oxidation states analysis
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Xe lamp
CEL-HXF300 CeauLight
CeauLight
Light source for photoelectrochemical measurement
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