研究目的
To investigate the photocatalytic activity and surface adsorption properties of Ag nanoparticles decorated on TiO2 nanotubes for the decolorization of methylene blue under dark and visible light irradiation.
研究成果
Ag/TiO2 nanotubes with 3.31 wt% Ag nanoparticles were successfully synthesized and demonstrated enhanced photocatalytic degradation of methylene blue under visible light and high adsorption in dark conditions, making them promising for water purification applications.
研究不足
The study is limited to methylene blue as a model pollutant; applicability to other dyes or real wastewater may vary. The catalyst's performance could be affected by factors like pH and temperature, and reusability showed some degradation after multiple runs due to agglomeration.
1：Experimental Design and Method Selection:
The study involved synthesizing TiO2 nanotubes (TNT) and Ag/TNT using modified hydrothermal and solvothermal methods. The photocatalytic activity was evaluated through decolorization of methylene blue (MB) in aqueous solution under various light conditions (dark, room light, visible light, UV light).
2：Sample Selection and Data Sources:
MB (standard methylene blue tablets for milk testing) was used as the pollutant. Catalysts (TiO2-NTs, Ag/TNT) were prepared and characterized.
3：List of Experimental Equipment and Materials:
Equipment included FTIR (Shimadzu FT-IR 8300), XRD (Bruker D8-advance), UV-Vis (Shimadzu UV-2450), SEM (JEOL, JSM-7610F Fe-SEM), TEM (JEM-2100F), EDS (TESCAN-Vega3), BET (Micromeritics ASSP 2020), XPS (Thermo Scientific, ESCALAB 250 Xi Mg X-ray resource), and UV-visible spectrophotometer (Alpha-1106/1506). Materials included TiO2-P25, NaOH, HCl, AgNO3, ethanol, deionized water.
4：6). Materials included TiO2-P25, NaOH, HCl, AgNO3, ethanol, deionized water. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: TiO2-NTs were prepared by refluxing TiO2-P25 in NaOH solution, followed by acid treatment and calcination. Ag/TNT was prepared by immersing TiO2-NTs in AgNO3 ethanol solution and refluxing. Photocatalytic tests involved mixing MB solution with catalyst, stirring in dark for adsorption equilibrium, then exposing to light. Samples were taken periodically for concentration measurement.
5：Data Analysis Methods:
MB concentration was measured using UV-Vis spectrophotometry at 660 nm. Decolorization efficiency was calculated using the formula E = (C0 - C)/C0 * 100. Characterization data were analyzed using techniques like XRD for crystal size determination via Scherrer equation.
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X-ray Photoelectron Spectrometer
ESCALAB 250 Xi
Thermo Scientific
Used for X-ray photoelectron spectroscopy to analyze surface chemistry and electronic states.
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FT-IR Spectrometer
FT-IR 8300
Shimadzu
Used for Fourier transform infrared spectroscopy to characterize the catalysts.
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X-ray Diffractometer
D8-advance
Bruker
Used for X-ray powder diffraction to analyze crystal structure and phase of materials.
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UV-Visible Spectrophotometer
UV-2450
Shimadzu
Used for UV-visible absorbance measurements to study optical properties.
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Scanning Electron Microscope
JSM-7610F Fe-SEM
JEOL
Used for scanning electron microscopy to examine surface morphology.
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Transmission Electron Microscope
JEM-2100F
JEOL
Used for transmission electron microscopy to analyze nanostructure and particle size.
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Energy-Dispersive X-ray Spectrometer
Vega3
TESCAN
Used for energy-dispersive X-ray spectroscopy to determine elemental composition.
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BET Surface Area Analyzer
ASSP 2020
Micromeritics
Used for Brunauer-Emmett-Teller analysis to measure surface area and pore characteristics.
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UV-Visible Spectrophotometer
Alpha-1106/1506
Not specified
Used for monitoring MB concentration variation during photocatalytic tests.
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