研究目的
To study the effect of operational parameters on the photocatalytic degradation of Methylene blue dye solution using Manganese doped ZnO nanoparticles under UV light illumination.
研究成果
Mn doping enhances the photocatalytic efficiency of ZnO, with 2% Mn-doped ZnO showing the highest activity. Optimal conditions (0.30 g/L catalyst, 10 ppm dye concentration, pH 10) achieve 99% degradation in 120 minutes. The reduction in electron-hole recombination due to doping is key to improved performance.
研究不足
The study is limited to UV light irradiation and specific operational parameters; it does not explore visible light photocatalysis or other dopants. The scalability and long-term stability of the catalyst in real wastewater conditions were not addressed.
1：Experimental Design and Method Selection:
The study used a wet chemical co-precipitation method for synthesizing Mn-doped ZnO nanoparticles. Photocatalytic degradation experiments were conducted under UV light irradiation in a custom-made photoreactor, with degradation monitored via UV-Vis spectrophotometry.
2：Sample Selection and Data Sources:
Samples included undoped ZnO and Mn-doped ZnO (x=
3：02 and 05). Methylene blue dye solution in distilled water served as the model wastewater. List of Experimental Equipment and Materials:
Equipment included X-ray diffractometer (Phillip's PANalytical X'PERT PRO), SEM (FEI Quanta 250), EDX, FTIR spectrophotometer (Perkin Elmer Spectrum Two), UV-Vis spectrophotometer (Ocean Optics HR4000), photoluminescence spectrometer (Horiba Fluoromax-4), and a UV lamp (Phillips 8W UV-C). Materials included zinc acetate dihydrate, manganese acetate tetrahydrate, sodium hydroxide, and methylene blue dye.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dissolving precursors, adding NaOH to precipitate, washing, drying, and grinding. Photocatalytic experiments involved suspending catalyst in dye solution, achieving adsorption-desorption equilibrium in dark, irradiating with UV light, and sampling at intervals to measure absorbance.
5：Data Analysis Methods:
Data were analyzed using Rietveld refinement for XRD, Gaussian fitting for PL spectra, and first-order kinetics for degradation rates. Percentage degradation was calculated based on absorbance changes.
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