研究目的
Investigating the effect of nanographene platelets (NGP) in transition metal-doped ZnO for photocatalytic application, specifically to enhance the performance of Fe-doped ZnO to degrade methylene blue dye in an aqueous solution under UV light irradiation.
研究成果
Fe-doped ZnO/NGP nanocomposites were successfully prepared, showing that certain amounts of NGP can enhance the photocatalytic degradation of methylene blue under UV light. The main active species in the photocatalytic activity were identified as electrons. Optimal conditions for photocatalytic activity were determined to be 20 mg/L of initial dye concentration and 0.5 g/L of catalyst dosage.
研究不足
The study found that increasing NGP content beyond 5 wt.% decreased the photoefficiency of the nanocomposites, likely due to hindered UV light exposure of ZnO by free graphene sheets. The thermal stability of the samples also decreased with increasing NGP loading.
1：Experimental Design and Method Selection:
The co-precipitation method was used to synthesize Fe-doped ZnO nanoparticles and Fe-doped ZnO/NGP nanocomposites with varying NGP loadings (3, 5, and 10 wt.%).
2：Sample Selection and Data Sources:
FeSO
3：7H2O, ZnSO7H2O, NaOH, and nanographene platelets were used as starting materials. List of Experimental Equipment and Materials:
Ultrasonic machine, magnetic stirrer, centrifuge, vacuum dryer, TGA Rigaku Thermo Plus EVO2 TG-8121 analyzer, XRD Rigaku Miniflex 600, Thermoscientific DRX XI Raman Spectrometer, FTIR FEI Spectrophotometer Shimazu IR Prestige-21, UV-Vis Hitachi UH5200 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The samples were characterized using TGA, XRD, Raman spectroscopy, and FTIR. Photocatalytic activity was examined under UV light irradiation with methylene blue as the pollutant.
5：Data Analysis Methods:
The degradation of methylene blue was calculated using UV-Vis spectrophotometry to determine the concentration changes over time.
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