Preparation and photocatalytic decolorization performance of MIL-100(FeⅡ/FeⅢ)/ACF composites
MIL-100(FeⅡ/FeⅢ)/ACF composites were prepared by in-situ growth at room temperature using ferrous heptahydrate and anhydrous ferrous sulfate as metal salts,trimesic acid as ligand and active carbon fiber(ACF)as base material.The influence of the preparation and application processes of composites on the photocatalytic decolorization effect for reactive brilliant blue KN-R was studied and the mechanism of its photocatalytic decolorization was explored.The results showed that the decolorization rate of the composite,which was prepared by in-situ growth for 20h with the mole ratio of Fe2+to Fe3+of 3∶1 on 80mg/L reactive brilliant blue KN-R solution adding 0.32mL/L H2O2at pH 3.0 reached 97.1％under the condition of 1000W xenon light illumination and reacting for 120min.The decolorization rate was above 95.8％within the range of pH 3.0 to 6.2.After 5 times reuse,the decolorization rate was decreased but still could reach 85.5％.Through free radical capture experiments,it was found that hydroxyl radicals(·OH)and photo generated vacancies(h+)played the main role in the photocatalytic system.The composites were characterized by SEM,XRD,FTIR and XPS.The results indicated that MIL-100(FeⅡ/Fem)was successfully loaded on ACF.The active site binding energy of MIL-100(FeⅡ/Fem)/ACF was 0.2-0.3eV higher compared to MIL-100(FeⅡ)/ACF.
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