研究目的
To enhance the visible light photocatalytic activity of ZnO nanoparticles by modification with cyclized polyacrylonitrile (CPAN) for the degradation of organic dyes.
研究成果
ZnO/CPAN nanocomposites show higher visible light absorption and significantly improved photocatalytic activity compared to pure ZnO. The nanocomposites possess excellent photocatalytic stability, making them promising for environmental purification applications.
研究不足
The study focuses on the modification of ZnO with CPAN for enhanced photocatalytic activity under visible light, but the scalability and cost-effectiveness of the synthesis process for large-scale applications are not discussed.
1：Experimental Design and Method Selection
The ZnO/CPAN composites were prepared by impregnation and heat treatment process. The photocatalytic activity was evaluated by the degradation of methyl orange under xenon lamp irradiation.
2：Sample Selection and Data Sources
Polyacrylonitrile (PAN) was prepared by precipitation polymerization, and zinc oxide (ZnO) was prepared by precipitation method. The as-prepared PAN was dissolved in dimethyl sulfoxide (DMSO), then ZnO nanoparticles were added into PAN solution.
3：List of Experimental Equipment and Materials
UV-vis-diffuse reflectance spectroscope (DRS), X-ray diffraction, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), xenon lamp (300W, HSX-FIUX300, Beijing NBeT Group Corp.), T6 UV-vis spectrophotometer.
4：Experimental Procedures and Operational Workflow
The suspension was agitated continuously for 2 h away from light, then let it stand for about 3 h. ZnO/PAN nanocomposites were obtained by evaporating the solvent from the suspension and dried at 60°C for 24 h. The as-prepared ZnO/PAN nanocomposites were heat-treated in the muffle at different temperatures for different times.
5：Data Analysis Methods
The MO absorbance was determined by a T6 UV-vis spectrophotometer at 465 nm with deionized water as a reference sample. The MO concentration was calculated by the working curve.
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X-ray photoelectron spectroscopy
XPS
Perkin Elmer PHI1600 ESCA system
Probing surface property of the ZnO/CPAN nanocomposite.
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X-ray diffraction
XRD
Rigaku D/MAX-2500
Determination of the crystal structures of samples.
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UV-vis-diffuse reflectance spectroscope
DRS
Characterization of the absorption properties of the nanocomposites.
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Transmission electron microscopy
TEM
Examination of the morphologies of the as-synthesized samples.
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Xenon lamp
HSX-FIUX300
Beijing NBeT Group Corp.
Irradiation source for photocatalytic activity evaluation.
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UV-vis spectrophotometer
T6
Determination of MO absorbance at 465 nm.
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