研究目的
To synthesize a series of double perovskite oxides Sr2FeMoO6 and Sr1.9A0.1FeMoO6 (A = Li, Na, K) using the sol-gel method and investigate their photocatalytic activities for the degradation of dye acid black 10 B.
研究成果
The sol-gel method successfully synthesized Sr2FeMoO6 and Sr1.9A0.1FeMoO6 (A = Li, Na, K) with high photocatalytic activity for acid black 10 B. Na+ or K+ doping improved the photocatalytic activity, while Li+ doping slightly decreased it. The photocatalytic mechanism involves the generation of hydroxyl radicals under UV irradiation.
研究不足
The study focuses on the photocatalytic degradation of a specific dye (acid black 10 B) and the effects of alkali metal doping on the photocatalytic activity of Sr2FeMoO6. The applicability to other dyes or pollutants is not explored.
1：Experimental Design and Method Selection:
The sol-gel method was used to synthesize the samples. The crystal structure was investigated by X-ray powder diffraction.
2：Sample Selection and Data Sources:
Stoichiometric powders of Sr(NO3)2, Fe(NO3)3·9H2O, (NH4)6Mo7O4·4H2O, LiNO3 (NaNO3 or KNO3) were mixed with citric acid and dissolved with distilled water.
3：List of Experimental Equipment and Materials:
X-ray powder diffraction (XRD) with CuKα radiation on a Y2000 diffractometer, TU-1810 UV-visible spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The pH of the solution was adjusted to 3 by aqueous ammonia. The gel was dried and pyrolyzed, then pre-sintered and finally sintered in a reducing atmosphere.
5：Data Analysis Methods:
The decolorizing rate was calculated based on the absorbance of the filtrate at the maximum absorption of the dye.
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