三维多孔LaFeO3/CeO2/SrTiO3光芬顿和光催化协同脱色亚甲基蓝

doi:10.19964/j.issn.1006-4990.2023-0474

Abstract

Abstract:

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 instruments such as X-ray diffraction spectrometer，scanning electron microscope，fully automatic surface area and pore size analyzer，X-ray photoelectron spectroscopy，and UV-vis spectrophotometer.The decolorization effect of the catalyst on methylene 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 synthesized，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 ultraviolet 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 substances were achieved under the synergistic effect of photo-Fenton and photocatalysis of the catalyst.

Key words: three-dimensional porous material, LaFeO₃/CeO₂/SrTiO₃, photo-Fenton, photocatalysis, heterogeneous catalyst

CLC Number:

O643.3

LI Jiangpeng, ZHANG Huibin. Synergistic degradation of methylene blue by photo-Fenton and photocatalytic with 3D porous LaFeO₃/CeO₂/SrTiO₃[J]. Inorganic Chemicals Industry, 2024, 56(5): 141-148.

Figures/Tables 10

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初始pH	ρ（Fe）/（mg·L^-1）	初始pH	ρ（Fe）/（mg·L^-1）
2	0.21	8	0.05
4	0.14	10	0.04
6	0.09

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Synergistic degradation of methylene blue by photo-Fenton and photocatalytic with 3D porous LaFeO₃/CeO₂/SrTiO₃

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催化剂	比表面积/（m²·g^-1）
LaFeO₃	5
3DP LaFeO₃	71
3DP LaFeO₃/CeO₂	64
3DP LaFeO₃/CeO₂/SrTiO₃	58

Synergistic degradation of methylene blue by photo-Fenton and photocatalytic with 3D porous LaFeO3/CeO2/SrTiO3