研究目的
Investigating the synthesis and photocatalytic water-splitting activity of gallium zinc oxynitride derived from flux-assisted Zn/Ga layered double hydroxides.
研究成果
The study successfully synthesized highly crystalline (GaN)1-x(ZnO)x solid solutions with enhanced photocatalytic water-splitting activity using a flux-assisted method. The bandgap energy and ZnO content were effectively controlled, leading to improved performance under visible light irradiation.
研究不足
The study focuses on the synthesis and photocatalytic activity of (GaN)1-x(ZnO)x solid solutions under specific conditions. Potential areas for optimization include the control of ZnO content and bandgap engineering for enhanced activity.
1：Experimental Design and Method Selection
The study involves the synthesis of (GaN)1-x(ZnO)x solid solutions by calcining Zn/Ga-LDH precursors with and without sodium carbonate flux under NH3 gas flow. The methodology includes the use of flux to enhance crystallinity and photocatalytic activity.
2：Sample Selection and Data Sources
Zn2Ga-LDH was prepared by coprecipitation method. The (GaN)1-x(ZnO)x solid solutions were synthesized from this precursor with varying nitridation times.
3：List of Experimental Equipment and Materials
Equipment includes Rigaku D/MAX RINT 2200-Ultima+ diffractometer, JASCO FT/IR-6100 spectrometer, JEOL JSM-6700F FE-SEM, and ASAP 2040 for surface area measurements. Materials include Zn(NO3)2·6H2O, Ga(NO3)3, Na2CO3, NaOH, NH3 gas, and others.
4：Experimental Procedures and Operational Workflow
The synthesis involved mixing Zn2Ga-LDH with Na2CO3 flux, grinding, and calcining under NH3 flow. Photocatalytic activity was evaluated under visible light irradiation with Rh-Cr mixed-oxide nanoparticles as cocatalysts.
5：Data Analysis Methods
PXRD patterns were analyzed using Rietveld refinement. UV-Vis diffuse reflectance spectra were used to determine bandgap energies. Photocatalytic activity was measured by gas evolution rates using gas chromatography.
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Rigaku D/MAX RINT 2200-Ultima+ diffractometer
D/MAX RINT 2200-Ultima+
Rigaku
Used for powder X-ray diffraction (PXRD) patterns recording.
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JASCO FT/IR-6100 spectrometer
FT/IR-6100
JASCO
Used for Fourier transform infrared (FT-IR) spectra obtaining.
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JEOL JSM-6700F field emission scanning electron microscope
JSM-6700F
JEOL
Used for scanning electron microscopic images (SEM) obtaining.
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450 W high-pressure Hg lamp
UM-452
Ushio Inc.
Used for visible light irradiation in photocatalytic reactions.
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GC-2014 gas chromatograph
GC-2014
Shimadzu
Used for evolved gas analysis in photocatalytic reactions.
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ASAP 2040
2040
ASAP
Used for specific surface areas study by N2 adsorption-desorption measurements.
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