研究目的
To enhance the visible light-driven photocatalytic performance of BiOI by constructing direct Z-scheme Bi2WO6/BiOI composites in-situ and to study their separation properties of photoinduced carriers.
研究成果
The Bi2WO6/BiOI composites, especially with 1% molar ratio, exhibit significantly enhanced photocatalytic performance under visible light due to improved separation of photoinduced carriers via a direct Z-scheme mechanism. This provides insights for developing efficient visible-light-driven photocatalysts for environmental remediation.
研究不足
The study may have limitations in scalability for industrial applications, potential variability in hydrothermal synthesis conditions, and the focus on RhB degradation which may not represent all pollutants. Optimization of Bi2WO6 loading and long-term stability beyond four cycles could be improved.
1：Experimental Design and Method Selection:
The study used a hydrothermal method to in-situ construct Bi2WO6/BiOI heterojunctions with varying molar ratios (0.5%, 1%, 2%, 5%) to enhance photocatalytic performance. Characterization methods included BET, XRD, DRS, SEM, HRTEM, SPS, ESR, and XPS to analyze structural, optical, and electronic properties. Photocatalytic activity was evaluated under visible light irradiation using Rhodamine B (RhB) degradation.
2：5%, 1%, 2%, 5%) to enhance photocatalytic performance. Characterization methods included BET, XRD, DRS, SEM, HRTEM, SPS, ESR, and XPS to analyze structural, optical, and electronic properties. Photocatalytic activity was evaluated under visible light irradiation using Rhodamine B (RhB) degradation. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Samples were prepared using analytical grade chemicals: Bi(NO3)3·5H2O, Na2WO4, KI, glacial acetic acid, deionized water, and absolute alcohol. Molar ratios were controlled to achieve different Bi2WO6/BiOI compositions.
3：List of Experimental Equipment and Materials:
Equipment included a Te?on-lined stainless-steel autoclave for hydrothermal synthesis, SSA-4200 automatic surface analyzer for BET, DX-2600 X-ray di?ractometer for XRD, UH4150 UV–Vis spectrophotometer for DRS, VEGA 3 SBU scanning electron microscope with EDS for SEM, Tecnai TEM G2 transmission electron microscope for TEM/HRTEM, XSAM 800 for XPS, custom setups for SPS and ESR, 500 W Xe lamp with cuto? ?lter (λ > 420 nm) for photocatalysis, and TU-1950 UV–Vis spectrophotometer for RhB concentration analysis. Materials included RhB, scavengers (ammonium oxalate, benzoquinone, isopropanol), and DMPO for ESR.
4：Experimental Procedures and Operational Workflow:
Hydrothermal synthesis at 453 K for 24 h, followed by washing, drying, and characterization. Photocatalytic tests involved dispersing samples in RhB solution, dark adsorption for 30 min, visible light irradiation, sampling at intervals, and UV-Vis analysis. Scavenger and ESR experiments were conducted to identify active species.
5：Data Analysis Methods:
Data were analyzed using first-order kinetics for RhB degradation rates, band gap calculations from DRS, and interpretation of SPS, ESR, and XPS spectra to propose mechanisms.
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autoclave
Te?on-lined stainless-steel
Used for hydrothermal synthesis of samples at high temperature and pressure.
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surface analyzer
SSA-4200
Measures specific surface area based on BET equation.
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X-ray diffractometer
DX-2600
Analyzes crystal structures of samples using Cu Kα radiation.
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UV-Vis spectrophotometer
UH4150
Collects UV-Vis diffuse reflectance spectra (DRS) of samples.
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scanning electron microscope
VEGA 3 SBU
Observes SEM images with EDS for elemental analysis.
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transmission electron microscope
Tecnai TEM G2
Observes TEM and HRTEM images with an accelerating voltage of 300 kV.
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X-ray photoelectron spectrometer
XSAM 800
Performs XPS measurements using Mg Kα radiation at 12 kV and 12 mA.
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Xe lamp
500 W
Provides visible light irradiation for photocatalytic tests with a cutoff filter (λ > 420 nm).
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UV-Vis spectrophotometer
TU-1950
Analyzes concentration of RhB in photocatalytic experiments.
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