研究目的
Investigating the effect of substituting molybdenum atoms with tungsten on the photocatalyst activity of cesium salt of Keggin type polyoxometalates decorated magnetic ceria for the photodegradation of Congo red dye in aqueous solutions under visible light.
研究成果
The Fe3O4@CeO2/Cs-PMo6W6O40 nanocomposite exhibited significantly enhanced photocatalytic activity for Congo red degradation under visible light and can be easily recovered by a magnetic field for reuse. This makes it a promising candidate for the removal of organic materials from wastewater.
研究不足
The study focuses on the photocatalytic degradation of Congo red dye under visible light, and the reusability of the photocatalyst was tested for only 5 cycles. The research could be expanded to include other organic pollutants and longer reusability tests.
1：Experimental Design and Method Selection:
The study involved the synthesis of cesium salts of polyoxometalate incorporated ceria and magnetic ceria nanocomposites via a simple method. The photocatalytic activity was evaluated by decolorization of Congo red in water under visible light irradiation.
2：Sample Selection and Data Sources:
The samples included cesium salts of tungestophosphoric acid, molybdophosphoric acid, and 6-molybdo tungestophosphoric acid, all having Keggin structure.
3：List of Experimental Equipment and Materials:
Powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), N2 adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM) were used for characterization.
4：Experimental Procedures and Operational Workflow:
The photocatalytic activity was evaluated by placing the photocatalyst into a Congo red aqueous solution, stirring in the dark for equilibrium, and then irradiating with a 400 W high-pressure mercury-vapor lamp.
5：Data Analysis Methods:
The degradation yield was calculated based on the concentration of Congo red before and after the reaction time.
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