研究目的
To design and construct a novel BiOBr/Ag6Si2O7 heterojunction with dual synergistic effects for enhancing visible light catalytic degradation performances with a sequential selectivity enabled by dual synergistic effects.
研究成果
The BiOBr/Ag6Si2O7 heterojunction exhibits enhanced visible light catalytic degradation performances with sequential selectivity, attributed to dual synergistic effects. The photocatalyst shows improved adsorption capacities and photodegradation rates for MO and MB, demonstrating potential for efficient removal of organic contaminants under visible light.
研究不足
The study focuses on the photocatalytic degradation of MB and MO under visible light irradiation. The limitations include the specificity of the dyes used and the conditions under which the experiments were conducted, which may not cover all possible organic contaminants or environmental conditions.
1：Experimental Design and Method Selection
The study involves the hydrothermal synthesis of BiOBr followed by precipitation to form BiOBr/Ag6Si2O7 heterojunctions. The methodology includes characterization techniques such as XRD, SEM, TEM, FT-IR, XPS, PL spectra, UV–vis diffuse reflectance spectra, and photocatalytic experiments under visible light irradiation.
2：Sample Selection and Data Sources
Samples include BiOBr, Ag6Si2O7, and BiOBr/Ag6Si2O7 hybrids with different proportions. Data sources include experimental measurements from the aforementioned characterization techniques.
3：List of Experimental Equipment and Materials
Materials include Bismuth nitrate pentahydrate, potassium bromide, silver nitrate, sodium silicate, ethanol, acetic acid, methylene blue, methyl orange, benzoquinone, ethylenediaminetetraacetic acid, and isopropanol. Equipment includes a Rigaku D/Max 2500 X-ray diffractometer, Hitachi S4700 field-emission scanning electron microscope, JEOL JEM-3010 transmission electron microscope, Nicolet Nexus 670 Fourier-transform infrared spectroscopy, Thermo VG RSCAKAB 250X high resolution X-ray photoelectron spectroscope, Hitachi F-5400 fluorescence spectrophotometer, Shimadzu UV-3600 UV–Vis-NIR spectrophotometer, and a CEL-HXUV300 xenon lamp for photocatalytic experiments.
4：Experimental Procedures and Operational Workflow
The synthesis involves dissolving Bi(NO3)3·5H2O in deionized water with HAc, mixing with KBr solution, hydrothermal treatment, washing, and drying. BiOBr/Ag6Si2O7 hybrids are synthesized by mixing BiOBr with AgNO3 and Na2SiO3·9H2O solutions, stirring, and freeze-drying. Photocatalytic experiments involve dispersing the photocatalyst in dye solutions under visible light irradiation, sampling at intervals, and measuring dye concentration.
5：Data Analysis Methods
Data analysis includes calculating adsorption capabilities and photocatalytic rates, using UV–vis spectroscopy for dye concentration measurement, and applying pseudo-first-order kinetics for degradation rate constants.
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Rigaku D/Max 2500 X-ray diffractometer
D/Max 2500
Rigaku
Used for obtaining X-ray diffraction patterns to analyze crystal structures.
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Hitachi S4700 field-emission scanning electron microscope
S4700
Hitachi
Used for observing the morphology and microstructure of samples.
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JEOL JEM-3010 transmission electron microscope
JEM-3010
JEOL
Used for high-resolution imaging and analysis of sample microstructures.
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Thermo VG RSCAKAB 250X high resolution X-ray photoelectron spectroscope
RSCAKAB 250X
Thermo VG
Used for surface chemical analysis and electronic state determination.
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Hitachi F-5400 fluorescence spectrophotometer
F-5400
Hitachi
Used for measuring photoluminescence spectra.
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Shimadzu UV-3600 UV–Vis-NIR spectrophotometer
UV-3600
Shimadzu
Used for UV–vis diffuse reflectance spectra and dye concentration measurements.
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Nicolet Nexus 670 Fourier-transform infrared spectroscopy
Nexus 670
Nicolet
Used for characterizing chemical compositions and bonding in samples.
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CEL-HXUV300 xenon lamp
HXUV300
CEL
Used as a light source for photocatalytic experiments.
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