研究目的
To investigate the photocatalytic efficiency of novel ZnFe2O4/CeO2 nanocomposites for the degradation of malachite green under visible light irradiation, with an aim to develop a promising visible-light driven catalyst for wastewater treatment.
研究成果
The ZnFe2O4/CeO2 nanocomposite with a 0.5:0.5 mole ratio exhibited superior photocatalytic activity, achieving 96% degradation of malachite green under visible light. This is attributed to enhanced light absorption, efficient charge separation, and a larger surface area. The catalyst shows potential for wastewater treatment and opens new opportunities in photocatalysis, with recommendations for future research on broader pollutant types and practical applications.
研究不足
The study is limited to the degradation of a single dye (malachite green) and may not generalize to other pollutants. The sonochemical synthesis method might have scalability issues for industrial applications. Optimization of parameters like pH and catalyst dosage was done, but further studies on real wastewater samples and long-term stability are needed.
1：Experimental Design and Method Selection:
The study employed a sonochemical method to synthesize ZnFe2O4/CeO2 nanocomposites with different mole ratios (
2：
3：6,
4：4,
5：5). The photocatalytic activity was evaluated under visible light irradiation using a tungsten lamp. Sample Selection and Data Sources:
Malachite green (MG) dye was used as a model organic pollutant. Deionized water and analytical grade chemicals were utilized.
6：List of Experimental Equipment and Materials:
Equipment included UV-2450 spectrophotometer, FT-IR spectrometer, X-ray diffractometer, SEM, TEM, BET surface area analyzer, fluorescence spectrophotometer, and HEBER immersion type photoreactor. Materials included cerium nitrate, zinc nitrate, iron nitrate, sodium hydroxide, ammonium hydroxide, and malachite green.
7：Experimental Procedures and Operational Workflow:
Synthesis involved sonication, precipitation, washing, drying, and annealing. Photodegradation experiments were conducted in a photoreactor with air bubbling, pH adjustment, dark equilibration, irradiation, sampling, centrifugation, filtration, and UV-Vis analysis.
8：Data Analysis Methods:
Data were analyzed using UV-Vis spectroscopy for degradation percentage, pseudo-first order kinetics for rate constants, and COD measurements for organic content reduction.
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