研究目的
To synthesize and evaluate the photocatalytic performance of WO3/AgCl composite under visible-light irradiation for the degradation of organic pollutants like Rhodamine B.
研究成果
The WO3/AgCl composite synthesized via a facile hydrothermal method exhibits enhanced photocatalytic activity and stability under visible light, making it a promising candidate for wastewater treatment. The optimal composite (with 1 mL HCl) achieved complete degradation of RhB in 30 minutes, attributed to efficient charge separation. Future work could explore broader applications and scale-up.
研究不足
The study is limited to laboratory-scale experiments with specific conditions; scalability to industrial applications may require further optimization. The composite's performance might be affected by variations in synthesis parameters or environmental factors not tested.
1：Experimental Design and Method Selection:
A facile single-pot hydrothermal method was used to synthesize WO3/AgCl composites by reacting α-Ag2WO4 with different amounts of HCl. The method was chosen for its simplicity and effectiveness in forming heterojunctions.
2：Sample Selection and Data Sources:
Precursors included sodium tungstate dihydrate, silver nitrate, hydrochloric acid, and other chemicals from specified suppliers. Samples were prepared with varying HCl amounts (0.5, 1.0, 1.5, 2.0 mL of 2 M HCl).
3：5, 0, 5, 0 mL of 2 M HCl). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included autoclave for hydrothermal synthesis, magnetic stirrer, oven, centrifuge, UV-vis spectrophotometer (MAPADA model), electrochemical workstation (CHI760D), XRD diffractometer (Rigaku D/max2500VB2+/PC), FT-IR spectrometer (Perkin-Elmer), UV-vis DRS spectrophotometer (Shimadzu UV-2600), SEM (Hitachi S-4700), HR-TEM (H-800 JEOL JEM-2100 F), XPS (ESCALAB 250). Materials included chemicals like Na2WO4·2H2O, AgNO3, HCl, RhB, etc.
4：0). Materials included chemicals like Na2WO4·2H2O, AgNO3, HCl, RhB, etc. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synthesis involved dissolving precursors, adding HCl dropwise, agitation, hydrothermal treatment at 160°C for 12h, washing, and drying. Photocatalytic tests involved mixing catalyst with RhB solution, stirring in dark for equilibrium, irradiating with 500W xenon lamp (λ > 420nm), sampling at intervals, and measuring concentration changes.
5：Data Analysis Methods:
Photodegradation efficiency calculated using Eq. (1): Degradation Efficiency(%) = (C0 - C)/C0 * 100. Kinetics analyzed with pseudo-first-order model. Band gap energies determined from Kubelka-Munk plots. Electrochemical studies included photocurrent and impedance measurements.
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X-ray diffractometer
D/max2500VB2+/PC
Rigaku
Used for XRD patterns to determine phase purity and structural formation of materials.
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UV-vis spectrophotometer
UV-2600
Shimadzu
Used for UV-vis DRS spectra to study optical properties.
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SEM
S-4700
Hitachi
Used for scanning electron microscopy to study surface morphologies.
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HR-TEM
H-800 JEOL JEM-2100 F
JEOL
Used for high-resolution transmission electron microscopy to confirm shapes and structures.
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FT-IR spectrometer
Perkin-Elmer
Used for FT-IR spectra to investigate the formation of materials.
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XPS
ESCALAB 250
Used for X-ray photoelectron spectroscopy to analyze elemental compositions and chemical states.
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UV-vis spectrophotometer
MAPADA
Used to measure concentrations of RhB solution at 554 nm.
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Electrochemical workstation
CHI760D
Shanghai Chenhua Instrument
Used for photo-electrochemical studies including photocurrent and impedance measurements.
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Xenon lamp
Used as a visible-light source (500W, λ > 420nm) for photocatalytic experiments.
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