研究目的
To improve the photogenerated charge carrier separation and stability of ZnFe2O4 by preparing new ZnFe2O4/Na-bentonite composites for simultaneous oxidation of RhB and reduction of Cr(VI) under visible light irradiation.
研究成果
The ZnFe2O4/Na-bentonite composite exhibits enhanced photocatalytic activity and stability for the simultaneous removal of RhB and Cr(VI) under visible light irradiation. The improved performance is attributed to the visible-light adsorption ability, larger interfacial area, and effective transfer and prolonged charge-hole separation. The composite shows potential for application in the treatment of wastewater containing mixed pollutants.
研究不足
The study focuses on the photocatalytic degradation under visible light irradiation and does not explore the effects of other light sources or environmental conditions. The scalability and practical application in real wastewater treatment scenarios are not discussed.
1：Experimental Design and Method Selection:
The ZnFe2O4/Na-bentonite composites were synthesized using a sol-gel method with Na-bentonite as the carrier. The composition, surface morphology, and optical properties were characterized by XRD, TEM, XPS, FTIR, and UV–vis DRS analysis.
2：Sample Selection and Data Sources:
The samples were prepared by calcining at different temperatures (400°C, 500°C, 600°C, 700°C) and compared with pure ZnFe2O
3：List of Experimental Equipment and Materials:
D/MAX-RB diffractometer, TEM (JSM-5610LV), XPS (ESCALAB II), FTIR spectrometer, UV–vis diffuse reflectance spectra (UV2550), PL emission spectra (Jobin Yvon Fluorolog3-221), BET surface area analyzer.
4：Experimental Procedures and Operational Workflow:
The photocatalytic performance was evaluated by the removal of RhB and K2CrO4 under simulated sunlight irradiation. The degradation efficiency was calculated based on the absorbance of the solution at specific wavelengths.
5：Data Analysis Methods:
The photocatalytic abilities were quantitatively evaluated using the rate constant k from the linear transform Ln (C0/C) of the kinetic curves.
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