研究目的
Investigating the effect of surface modification using triethanolamine (TEA) on the deposition of CdS quantum dots on titania nanostructures and its impact on photocatalytic performance.
研究成果
The addition of TEA during the SILAR deposition of CdS quantum dots on titania nanostructures significantly enhances the deposition rate and photocatalytic performance. The modified surface also shows improved recyclable photocatalytic activity, attributed to the formation of a protective TEA layer against photocorrosion.
研究不足
The study focuses on the effect of TEA on CdS deposition and photocatalytic performance but does not explore the long-term stability of the modified surfaces under continuous photocatalytic conditions.
1：Experimental Design and Method Selection:
The study involved the hydrothermal synthesis of titania nanoflakes-nanorods on a flexible titanium metal foil, followed by sensitization with CdS quantum dots using the SILAR method. The surface charge of titania was modified using TEA to enhance CdS deposition.
2：Sample Selection and Data Sources:
Commercial titanium metal sheet was used as the substrate. The samples were characterized using XRD, FE-SEM, and EDX analysis.
3：List of Experimental Equipment and Materials:
Titanium metal sheet, Sodium hydroxide pellets, HCl, Cadmium nitrate, Sodium sulphide, Triethanolamine, Methylene blue, Coumarin.
4：Experimental Procedures and Operational Workflow:
The titania nanostructures were synthesized hydrothermally, sensitized with CdS quantum dots via SILAR deposition with and without TEA, and characterized. Photocatalytic activity was assessed through methylene blue degradation under visible light.
5：Data Analysis Methods:
The photocatalytic activity was evaluated by measuring the degradation rate of methylene blue. The formation of OH radicals was confirmed through photoluminescence studies.
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X-ray diffractometer
D8 Advance
Bruker
Used for XRD analysis of the samples
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Field Emission Scanning Electron Microscope
SU8010
Hitachi
Used for surface morphology characterization
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UV-Vis spectrophotometer
UV-2550
Shimadzu
Used for photocatalytic studies
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Photoluminescence spectrometer
Cary Eclipse
Agilent
Used for photoluminescence studies
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Titanium metal sheet
Alfa Aesar
Substrate for hydrothermal synthesis of titania nanoflakes-nanorods
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Sodium hydroxide pellets
Merck
Used in the hydrothermal synthesis of titania nanostructures
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HCl
Merck
Used in the preparation of nanotitania
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Cadmium nitrate
Merck
Cationic precursor for CdS quantum dot deposition
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Sodium sulphide
Merck
Anionic precursor for CdS quantum dot deposition
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Triethanolamine
Merck
Surface modifier to enhance CdS quantum dot deposition
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Methylene blue
SRL
Dye used in photocatalytic degradation studies
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Coumarin
Alfa aesar
Fluorescence probe for detecting OH radicals
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