研究目的
Investigating the highly efficient degradation of methylene blue dye by CuO-ZnO nanoflowers under sunlight irradiation.
研究成果
The flower-like CuO-ZnO nanostructure (sample CZ-01) demonstrated superior photocatalytic activity, capable of degrading 98% MB dye within 30 minutes under solar irradiation. This process is highly economical for large quantities of industrial waste water containing dye molecules as no additional power is necessary.
研究不足
The study focuses on the degradation of methylene blue dye under sunlight irradiation. The applicability to other dyes or under different light sources was not explored.
1：Experimental Design and Method Selection
Facile single step hydrothermal method was used for the synthesis of CuO, ZnO and CuO-ZnO nanostructures. The effect of different operating parameters including OH- ion concentration, metal ion precursor, and synthesis method on the morphology of the CuO-ZnO product was studied.
2：Sample Selection and Data Sources
Samples were synthesized using zinc acetate dihydrate, zinc nitrate hexahydrate, copper acetate monohydrate, copper nitrate trihydrate, and sodium hydroxide. The photocatalytic activities were evaluated by exposing the aqueous MB dye solutions with or without catalysts to sunlight.
3：List of Experimental Equipment and Materials
X-ray diffraction (XRD) technique, Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), UV–Vis absorption spectra, photoluminescence spectra, digital lux-meter.
4：Experimental Procedures and Operational Workflow
The synthesis involved mixing metal salt solutions with sodium citrate and PEG-400, adding NaOH solution, and treating under hydrothermal condition. The photocatalytic activities were evaluated by dispersing photocatalysts in MB dye aqueous solution and exposing to sunlight.
5：Data Analysis Methods
The photocatalytic performance was evaluated by measuring the spectral changes at 663 nm for determination of residual MB concentration using UV-visible spectrometer. The reaction rates were calculated from the plot of ln(Ct/C0) verses irradiation time.
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X-ray diffractometer
Rigaku Miniflex 600
Rigaku
Phase identification of the as-synthesized samples
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Field Emission Scanning Electron Microscopy
JEOL-JSM Model 6700 F
JEOL
Investigation of surface morphologies of the samples
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Transmission Electron Microscopy
TEM 2200 FS
JEOL
Analysis of sample morphology and structure
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UV–Vis absorption spectrophotometer
JASCOV-570
JASCO
Recording UV–Vis absorption spectra of the samples
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Digital lux-meter
Lutron LX-101
Lutron
Measurement of sunlight irradiation intensity during photocatalytic degradation experiments
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