研究目的
To synthesize a novel photocatalyst that can efficiently harness the wide spectrum (UV-vis-NIR regions) of sunlight for photocatalytic degradation of pollutants.
研究成果
The hybrid microstructures exhibit enhanced photocatalytic activity across UV, visible, and NIR spectra due to synergistic effects and efficient energy transfer. This approach paves the way for developing materials that maximize solar energy utilization for environmental remediation.
研究不足
The study is limited to model pollutant degradation (methylene blue) and may not generalize to other contaminants. The scalability and long-term stability of the hybrid microstructures in real environmental conditions are not fully addressed. Optimization of Ag-Cu loading is empirical and may require further tuning for different applications.
1：Experimental Design and Method Selection:
The study involves designing hybrid microstructures combining upconversion nanophosphors (UCP), porous TiO2, and Ag-Cu bimetallic nanoparticles to utilize UV, visible, and NIR light. Methods include hydrothermal synthesis, coating, and decoration processes.
2：Sample Selection and Data Sources:
Materials include lanthanide salts, TiO2 precursors, Ag and Cu salts, and methylene blue dye as a model pollutant. All chemicals were purchased from Sigma Aldrich and Alfa Aesar.
3：List of Experimental Equipment and Materials:
Equipment includes autoclaves, centrifuges, magnetic stirrers, XRD (Rigaku Smart Lab 9 kW), TEM (FEI Tecnai G2 20 S-twin), UV-VIS-NIR spectrophotometer (PerkinElmer Lambda 750), fluorescence spectrophotometer (Agilent Cary Eclipse), BET surface area analyzer, and photoreactors (LUZ-4V for UV, homemade for visible, solar simulator for NIR). Materials include NaYF4:Yb/Tm nanoparticles, TiO2, Ag-Cu nanoparticles, and methylene blue.
4：Experimental Procedures and Operational Workflow:
Synthesis steps: a) Ag-Cu nanoparticles via reduction with NaBH4, b) UCP via hydrothermal method, c) UCP@TiO2 via hydrothermal coating and calcination, d) Decoration with Ag-Cu nanoparticles by incubation. Photocatalytic tests involved degrading methylene blue under UV, visible, and NIR light, with sampling at intervals for UV-Vis analysis.
5：Data Analysis Methods:
Data analyzed using XRD for structure, TEM for morphology, UV-Vis for optical properties, PL for charge recombination, and kinetic modeling for degradation rates.
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Powder X-ray Diffractometer
Smart Lab 9 kW
Rigaku
Used for collecting structural data of the nanocomposites.
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Transmission Electron Microscope
Tecnai G2 20 S-twin
FEI
Used for investigating the morphology of the materials.
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UV-VIS-NIR Spectrophotometer
Lambda 750
PerkinElmer
Used for collecting UV-vis-NIR absorption spectra and diffuse reflectance spectra.
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Fluorescence Spectrophotometer
Cary Eclipse
Agilent Technologies
Used for upconversion luminescence measurements.
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Photoreactor
LUZ-4V
Luzchem
Used for UV photocatalysis experiments.
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Solar Simulator
Trisol
OAI
Used for NIR light irradiation in photocatalytic degradation studies.
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Luxmeter
LX-101A
Used to measure light intensity in visible light experiments.
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