研究目的
Investigating the synthesis of Cu-Zn and Cu-Ni bimetallic nanoparticles using ascorbic acid as a green reducing and capping agent, and evaluating their catalytic properties in the photodegradation of methyl orange.
研究成果
The synthesis of monometallic and bimetallic nanoparticles using ascorbic acid is successful, economical, and environmentally friendly. Bimetallic nanoparticles show superior photocatalytic activity compared to monometallic ones, attributed to bi-functional effects and narrowed band gaps. The degradation of methyl orange follows first-order kinetics, with Cu-Zn nanoparticles having the highest rate constant. Future work could explore other metal combinations and applications in catalysis.
研究不足
The nanoparticles exhibit aggregation due to high surface energy, which may affect catalytic efficiency. The study is limited to specific metal combinations (Cu-Zn and Cu-Ni) and a single dye (methyl orange), and the synthesis method may not be scalable for industrial applications without optimization.
1：Experimental Design and Method Selection:
The study employs a chemical reduction method using ascorbic acid for synthesizing monometallic and bimetallic nanoparticles, with a focus on green chemistry principles. Theoretical models include Scherrer's equation for size calculation and first-order kinetics for degradation analysis.
2：Sample Selection and Data Sources:
Metal salts (cupric acetate, zinc acetate, nickel nitrate hexahydrate) and methyl orange dye are used as samples, sourced from Merck Pvt. Ltd. and Himedia company, respectively. Solutions are prepared with double distilled water.
3：List of Experimental Equipment and Materials:
Equipment includes Perkin Elmer Lambda 35 UV-visible spectrophotometer, Phillip XRD instrument, SEI quanta 250 SEM model, Perkin Elmer Spectrum 2 IR spectrophotometer, and a centrifuge. Materials include ascorbic acid, metal salts, methyl orange, ethanol, and double distilled water.
4：Experimental Procedures and Operational Workflow:
Ascorbic acid solution (0.34 M) is prepared. Nanoparticles are synthesized by dissolving metal salts in ascorbic acid, stirring for 1 hour, leaving undisturbed for 24 hours, centrifuging, washing with ethanol, and dispersing in water. Photodegradation is studied by adding nanoparticles to methyl orange in a cuvette, monitoring with UV-visible spectroscopy under light irradiation.
5：34 M) is prepared. Nanoparticles are synthesized by dissolving metal salts in ascorbic acid, stirring for 1 hour, leaving undisturbed for 24 hours, centrifuging, washing with ethanol, and dispersing in water. Photodegradation is studied by adding nanoparticles to methyl orange in a cuvette, monitoring with UV-visible spectroscopy under light irradiation.
Data Analysis Methods:
5. Data Analysis Methods: UV-visible spectra, XRD patterns, SEM images, EDAX, and IR spectra are analyzed. Particle sizes are calculated using Scherrer's equation. Degradation kinetics are analyzed by plotting ln A vs. time to determine rate constants, and band gaps are calculated using the Tauc relation.
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