研究目的
To design and synthesize SiO2-stabilized Bi nanoparticles with high activity and stability for visible light photocatalysis, and to study their photocatalytic and electrocatalytic applications.
研究成果
SiO2-stabilized Bi nanoparticles exhibit high photocatalytic activity and stability, with mechanisms involving indirect dye photosensitization for RhB and direct plasmonic photodegradation for BPA, and show promise for HER applications.
研究不足
The study is limited to specific pollutants (RhB and BPA) and conditions; scalability and real-world application not fully addressed; SiO2 thickness affects performance, requiring optimization.
1：Experimental Design and Method Selection:
A liquid phase chemical reduction method was used to synthesize Bi@SiO2 nanoparticles in acidic solution to avoid surface oxidation, followed by SiO2 coating to enhance stability.
2：Sample Selection and Data Sources:
Bismuth chloride, sodium hypophosphite, PVP, TEOS, RhB, and BPA were used as received. Deionized water was used in all experiments.
3：List of Experimental Equipment and Materials:
XRD (Shimadzu XRD-6100), SEM (Hitachi S-4800), TEM/HRTEM (Tecnai G2 F20), TG-DTA (WCT-1D), UV-vis spectrophotometers (Shimadzu UV-1800 and UV-2550), BET (JW-BK200C), Raman spectrometer (Labram-010), ESR (JES-FA200), electrochemical station (CHI 660E).
4：Experimental Procedures and Operational Workflow:
Bi nanoparticles were synthesized by reducing BiCl3 with NaH2PO2 at 80°C, pH adjusted to neutral, TEOS added for SiO2 coating, samples characterized, photocatalytic degradation of RhB and BPA under visible light, HER tested in H2SO
5：Data Analysis Methods:
XRD for crystal size calculation using Scherrer equation, UV-vis for concentration monitoring, TG-DTA for oxidation analysis, electrochemical methods for HER evaluation.
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Transmission electron microscopy
Tecnai G2 F20
FEI
Used for TEM and HRTEM experiments to analyze nanostructure.
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UV-vis spectrophotometer
UV-1800
Shimadzu
Used for measuring UV-vis absorption spectra.
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UV-vis spectrophotometer
UV-2550
Shimadzu
Used for measuring UV-vis diffuser reflectance spectra.
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Electron paramagnetic resonance spectrometer
JES-FA200
JEOL
Used for ESR measurements to detect active species.
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X-ray diffractometer
XRD-6100
Shimadzu
Used for obtaining XRD patterns to analyze crystal structure and size.
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Field emission scanning electron microscopy
S-4800
Hitachi
Used for recording SEM images to study morphology.
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Thermo-gravimetric and differential thermal analysis instrument
WCT-1D
BOIF
Used for TG-DTA analysis to study thermal properties and oxidation.
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BET characterization instrument
JW-BK200C
Beijing JWGB Sci.&Tech. Co., Ltd.
Used for Brunauer-Emmett-Teller characterization to analyze surface area and porosity.
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Laser confocal Raman spectrometer
Labram-010
Horiba
Used for Raman spectra measurements.
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Electrochemical station
CHI 660E
Chenhua Instrument Company of Shanghai
Used for electrochemical tests including linear sweep voltammetry for HER.
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Iodine lamp
Used as simulated solar light source for photocatalytic experiments.
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Glassy carbon electrode
Used as working electrode in HER tests.
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Nafion solution
Used to form homogeneous suspension for electrode preparation.
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