研究目的
Investigating the synthesis and application of nitrogen-doped graphene quantum dots (NGQDs) for photodegradation of methylene blue under illumination.
研究成果
The synthesized NGQDs exhibit broad absorption spectrum and high photoluminescence across UV, Vis, and IR regions, making them suitable for photocatalytic applications. The photocatalytic degradation of methylene blue was highly efficient under visible light irradiation, attributed to the convenient position of HOMO and LUMO energy levels of NGQDs.
研究不足
The study focuses on the synthesis and photocatalytic application of NGQDs but does not explore their stability over long periods or under different environmental conditions.
1：Experimental Design and Method Selection
Hydrothermal method was used for the synthesis of NGQDs by citric acid and urea. The optical properties were characterized using photoluminescence and UV-visible spectra. The photocatalytic performance was assessed by degrading methylene blue under visible light irradiation.
2：Sample Selection and Data Sources
NGQDs were synthesized with different concentrations of urea to study the effect of nitrogen doping on optical properties and photocatalytic activity.
3：List of Experimental Equipment and Materials
MIRA3 TESCAN for EDX analysis, Gilden photonics PL spectrometer, Takram P50C0R10 Raman spectrometer, CM30 300kV TEM, Philips Expert XRD, Perkin-Elmer UV-Vis spectrophotometer.
4：Experimental Procedures and Operational Workflow
The synthesis involved stirring citric acid and urea in deionized water, heating in an autoclave, and characterizing the resulting NGQDs. Photocatalytic activity was measured by irradiating a mixture of NGQDs and methylene blue with a xenon lamp.
5：Data Analysis Methods
Cyclic voltammetry was used to determine HOMO and LUMO energy levels. The degradation percent of methylene blue was calculated using UV-Vis spectroscopy.
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