研究目的
To develop binary-phase TiO2 modified Bi2MoO6 crystals for effective removal of antibiotics under visible light illumination.
研究成果
The binary-phase TiO2 modified Bi2MoO6 heterostructures significantly enhanced photocatalytic activity for antibiotic degradation under visible light due to increased surface area and improved charge separation at the heterojunction interface. Holes were identified as the main active species. The optimal TiO2 content was 0.41 wt%, demonstrating potential for environmental remediation applications.
研究不足
The study may have limitations in scalability for industrial applications, potential variability in TiO2 dispersion affecting reproducibility, and reliance on specific light conditions (visible light only). Optimization for real wastewater matrices and long-term stability were not extensively addressed.
1：Experimental Design and Method Selection:
The study employed a solvothermal-calcination method to synthesize TiO2/Bi2MoO6 composites, with characterization using XRD, N2 adsorption, SEM, TEM, UV–vis DRS, Raman, XPS, PL, and photo-electrochemical measurements to analyze physicochemical properties and photocatalytic activity.
2：Sample Selection and Data Sources:
Catalysts were prepared with varying TiO2 content (0, 0.16, 0.27, 0.41, 0.55 wt%) using Bi(NO3)3·5H2O, (NH4)6Mo7O24·4H2O, and TiO2 synthesized in a W/O emulsion system. Antibiotics (ciprofloxacin, tetracycline, oxytetracycline hydrochloride) were used as pollutants in aqueous solutions.
3：16, 27, 41, 55 wt%) using Bi(NO3)3·5H2O, (NH4)6Mo7O24·4H2O, and TiO2 synthesized in a W/O emulsion system. Antibiotics (ciprofloxacin, tetracycline, oxytetracycline hydrochloride) were used as pollutants in aqueous solutions. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included Bruker D8-advance X-ray diffractometer, Micromeritics ASAP 2010 analyzer, FLA650 F SEM, Tecnai 20 FEG TEM, UV-2600 spectrophotometer, Nicolet 5700 FT-IR spectrometer, PHI Quantum 2000 XPS system, Hitachi F-4500 fluorescence spectrometer, CHI-660E electrochemical workstation, and XPA-7 Xe lamp. Materials were analytical grade reagents from Sinopharm Chemical Reagent Co. Ltd. and Shanghai Macklin Biochemistry Technology Co. Ltd.
4：Experimental Procedures and Operational Workflow:
TiO2 was synthesized via hydrothermal method; Bi2MoO6 and composites were prepared by solvothermal-calcination. Photocatalytic degradation tests involved stirring catalyst with antibiotic solution in dark for adsorption equilibrium, then irradiating with visible light (λ ≥ 420 nm) and sampling at intervals for UV–vis analysis.
5：Data Analysis Methods:
Degradation rates were calculated using absorbance changes; kinetics followed pseudo-first-order model; band gaps were determined from Tauc plots; active species were identified using scavengers (N2, TEOA, TBA).
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X-ray diffractometer
D8-advance
Bruker
Used for powder X-ray diffraction to analyze crystal structure of samples.
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Scanning electron microscope
FLA650 F
FEI Company
Used for SEM imaging to analyze morphology of samples.
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UV–vis spectrophotometer
UV-2600
Shimadzu
Used for UV–vis diffuse reflectance spectra (DRS) to measure light absorption.
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Fluorescence spectrometer
F-4500
Hitachi
Used for photoluminescence (PL) emission spectra.
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Automatic analyzer
ASAP 2010
Micromeritics
Used for N2 adsorption/desorption isotherms to determine BET surface areas.
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Transmission electron microscope
Tecnai 20 FEG
Used for TEM and HRTEM imaging to analyze microstructure.
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FT-IR spectrometer
Nicolet 5700
Used for Fourier transform infrared spectra.
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XPS system
PHI Quantum 2000
Used for X-ray photoelectron spectroscopy to determine surface composition.
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Electrochemical workstation
CHI-660E
Used for photocurrent and electrochemical impedance spectroscopy measurements.
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Xenon lamp
XPA-7
XuJiang electromechanical
Used as visible light source for photocatalytic degradation experiments.
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