研究目的
To develop a cost-effective and environmentally friendly green synthesis method for cerium oxide nanoparticles using Artemisia pallens leaf extract and evaluate their photocatalytic activity in degrading methylene blue under UV light.
研究成果
CeO2 nanoparticles synthesized via green method using Artemisia pallens extract exhibit high photocatalytic activity for methylene blue degradation under UV light, with optimal performance at pH 11 and calcination at 500°C. The nanoparticles show good reusability over 5 cycles with minimal efficiency loss, indicating potential for environmental remediation applications. The degradation follows pseudo-first-order kinetics, and the method is cost-effective and eco-friendly.
研究不足
The study is limited to the use of Artemisia pallens extract for synthesis, which may not be universally applicable. The photocatalytic testing was conducted only under UV light and with methylene blue dye, potentially limiting generalizability to other conditions or pollutants. Optimization of synthesis parameters (e.g., temperature, pH) could be further explored for enhanced performance.
1：Experimental Design and Method Selection:
The experiment used a co-precipitation method for green synthesis of CeO2 nanoparticles, leveraging Artemisia pallens leaf extract as a reducing and capping agent. Theoretical models included Scherrer's equation for crystallite size calculation and Langmuir-Hinshelwood kinetics for photocatalytic degradation analysis.
2：Sample Selection and Data Sources:
Cerium(III) nitrate hexahydrate was used as the precursor, and Artemisia pallens leaves were sourced for the extract. Methylene blue dye solutions at various concentrations (5-40 mg/L) were prepared for photocatalytic testing.
3：List of Experimental Equipment and Materials:
Equipment included a Panalytical X-Ray diffractometer, Perkin Elmer FTIR spectrometer, JEOL JEM 2010HR TEM operating at 200 kV, Shimadzu UV-visible spectrophotometer, Hitachi UV-VIS-NIR spectrophotometer, a 12 W UV lamp, centrifuge, and heating/stirring apparatus. Materials included cerium(III) nitrate hexahydrate, NaOH tablets, distilled water, and Artemisia pallens leaves.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dissolving cerium(III) nitrate hexahydrate in water, preparing Artemisia pallens extract, mixing dropwise under stirring, adding NaOH to adjust pH, precipitating, centrifuging at 6000 rpm, and drying at 373 K. Characterization was done via XRD, TEM, FTIR, and UV-Vis spectroscopy. Photocatalytic activity was tested by adding CeO2 nanoparticles to methylene blue solutions under UV light, sampling at intervals, and measuring degradation via spectrophotometry.
5：Data Analysis Methods:
Crystallite size was calculated using Scherrer's formula from XRD data. Photocatalytic degradation efficiency was analyzed using pseudo-first-order kinetics and Langmuir-Hinshelwood model, with rate constants determined from plots of degradation over time.
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