Synergistic degradation of methylene blue by photo-Fenton and photocatalytic with 3D porous LaFeO3/CeO2/SrTiO3
The three-dimensional porous catalyst 3DP LaFeO3/CeO2/SrTiO3 was prepared by sol-gel method and chemical precipitation method using polymethyl methacrylate microspheres as template.The catalyst was characterized by instru-ments such as X-ray diffraction spectrometer,scanning electron microscope,fully automatic surface area and pore size ana-lyzer,X-ray photoelectron spectroscopy,and UV-vis spectrophotometer.The decolorization effect of the catalyst on methy-lene blue was investigated,and the effects of pH,hydrogen peroxide dosage and temperature on the decolorization effect of the catalyst were analyzed.The research results indicated that the 3DP LaFeO3/CeO2/SrTiO3 composite was successfully syn-thesized,exhibiting a porous structure,high specific surface area,and optical properties.The catalyst exhibited effective catalytic performance with wide pH range and low iron mud yield in the decolorization reaction of methylene blue under ul-traviolet light irradiation.The catalytic decolorization performance of the catalyst was improved by appropriately increasing the amount of hydrogen peroxide and the temperature of the reaction liquid.The optimal dosage of hydrogen peroxide was 5 mL/L and the optimal temperature of the reaction liquid was 55℃.Finally,this article proposed a catalytic mechanism for the decolorization of methylene blue.The continuous cycling of Fe3+/Fe2+ and Ce4+/Ce3+ and the production of active sub-stances were achieved under the synergistic effect of photo-Fenton and photocatalysis of the catalyst.
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