研究目的
To develop a novel N-doped K3Ti5NbO14@TiO2 core-shell heterojunction photocatalyst with enhanced visible-light-driven photocatalytic activity for the degradation of organic pollutants like methylene blue.
研究成果
The NTNT photocatalyst exhibits enhanced visible-light photocatalytic activity due to synergistic effects of morphology engineering, N doping, and heterojunction formation, with good stability. It shows promise for environmental remediation applications.
研究不足
The study focuses on methylene blue degradation under visible light; applicability to other pollutants or light conditions may require further investigation. The stability was tested for five cycles, but long-term durability and scalability for industrial use are not fully addressed.
1：Experimental Design and Method Selection:
A facile one-step calcination method was used to synthesize the photocatalyst, involving mixing titanium isopropoxide with K3Ti5NbO14 nanobelts and calcining at 500°C with urea as a nitrogen source.
2：Sample Selection and Data Sources:
Layered K3Ti5NbO14 was prepared from K2CO3, TiO2, and Nb2O5; other samples included TNT, N-TiO2, and pure TiO2 for comparison.
3：List of Experimental Equipment and Materials:
Equipment included X-ray diffractometer (Philip-X'Pert), UV-Vis spectrophotometer (Shimadzu UV-3600 plus), FE-SEM (Nano SEM 450), HRTEM (JEOL JEM-2100F), XPS spectrometer (Thermo Fisher Scientific K-Alpha), luminescence spectrometer (Hitachi F4500), and photocurrent measurement system (CHI660D). Materials included titanium isopropoxide, urea, ethanol, methylene blue, and various chemicals for synthesis.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dispersion, stirring, evaporation, milling, calcination, and washing. Characterization included XRD, SEM, TEM, UV-Vis, XPS, PL, and photocurrent measurements. Photocatalytic tests involved degrading MB under visible light with a Xe-lamp and filter, measuring concentration changes over time.
5：Data Analysis Methods:
Data were analyzed using standard techniques for each characterization method, with photocatalytic efficiency calculated as Ct/C0 from UV-Vis spectra.
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UV-Vis spectrophotometer
UV-3600 plus
Shimadzu
Measuring ultraviolet-visible diffuse reflectance spectra of samples.
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Transmission electron microscopy
JEM-2100F
JEOL
High-resolution imaging of sample morphology and structure.
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X-ray photoelectron spectrometer
K-Alpha
Thermo Fisher Scientific
Analyzing chemical states of elements in samples.
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Luminescence spectrometer
F4500
Hitachi
Measuring photoluminescence spectra to study charge carrier recombination.
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X-ray diffractometer
X'Pert
Philip
Analyzing crystal structure of samples through X-ray diffraction patterns.
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Field-emission scanning electron microscopy
Nano SEM 450
Investigating morphology of samples.
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Electrochemical workstation
CHI660D
Measuring transient photocurrent responses using a three-electrode system.
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Xe-lamp
Providing visible light irradiation for photocatalytic tests.
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