研究目的
To study the transparent and photocatalytic properties of Na-doped ZnO nanoparticles prepared by the sol-gel method, and investigate the influences of Na content on the structural, transparent, and photocatalytic properties.
研究成果
Na-doped ZnO nanoparticles synthesized by sol-gel method exhibit improved structural, optical, and photocatalytic properties compared to pure ZnO, with optimal performance at 2 at.% Na doping, showing high transmittance and up to 91% photodegradation efficiency under UV light.
研究不足
The study is limited to specific Na doping concentrations (0-10 at.%) and annealing conditions; potential limitations include the use of a single synthesis method (sol-gel) and the focus on methylene blue degradation, which may not generalize to other pollutants or conditions.
1：Experimental Design and Method Selection:
The sol-gel method was used for synthesis, with annealing at 500°C for 4 hours. Characterization involved XRD, FESEM, TEM with EDS, UV-visible spectroscopy, and photocatalytic degradation tests under UV light.
2：Sample Selection and Data Sources:
Pure and Na-doped ZnO films with Na concentrations of 0%, 2%, 5%, and 10% were prepared.
3：List of Experimental Equipment and Materials:
Zinc acetate dehydrate, deionized water, ethanol, diethanol amine (DEA), sodium chloride (NaCl), XRD (Rigaku D/MAX-YA), TEM (JEM-2100), FESEM (SUPRA 55), UV-visible spectroscope (UV-1700), 500 W mercury lamp, centrifuge, UV-vis spectrometer.
4：Experimental Procedures and Operational Workflow:
Dissolve zinc acetate in water-ethanol mixture, add DEA, stir at 70°C for 2 h, age for 48 h, dry at 110°C for 48 h, calcine at 500°C for 4 h. For photocatalysis, add catalyst to methylene blue solution, stir in dark for 30 min, irradiate with UV light, sample every 20 min, centrifuge, measure absorbance at 665 nm.
5：Data Analysis Methods:
XRD data analyzed using Scherrer formula for crystallite size, Tauc's plot for band gap calculation, and degradation efficiency calculated from absorbance changes.
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