Heterogeneous Fenton catalyst LaFeO3/3DOMCeO2 as well as preparation method and application thereof

Abstract

The invention relates to a heterogeneous Fenton catalyst LaFeO3 / 3DOMCeO2 preparation method, which comprises: S1, adding a soluble cerium source and PMMA microspheres in water or a mixed solvent of water and ethanol, carrying out stirring and / or ultrasonic treatment, maintaining the stirring state, carrying out evaporation at a temperature of less than or equal to 70 DEG C to obtain a gelatinous substance, and drying to obtain a carrier precursor; s2, carrying out aerobic roasting on the carrier precursor to obtain a three-dimensional ordered macroporous CeO2 carrier; s3, adding the three-dimensional ordered macroporous CeO2 carrier into an aqueous solution of lanthanum salt, ferric salt and a complexing agent, evaporating to be gel at the temperature of less than or equal to 70 DEG C under a stirring state, aging for more than 12 hours, carrying out suction filtration, and drying a filter cake to obtain a catalyst precursor; and S4, carrying out aerobic roasting on the catalyst precursor to obtain the three-dimensional ordered macroporous CeO2 loaded LaFeO3 heterogeneous Fenton catalyst. Compared with an existing homogeneous Fenton catalyst, the catalyst has the advantages of wider pH application range, lower Fe leaching concentration and higher hydrogen peroxide utilization rate.

Description

technical field [0001] The invention relates to the technical field of catalytic treatment of organic wastewater, in particular to a heterogeneous Fenton catalyst LaFeO 3 / 3DOMCeO 2 and preparation method and application thereof. Background technique [0002] At present, my country has grown into the country with the most complete industrialization system in the world, and such an industrialization system is bound to require the support of a strong material manufacturing system. The production of some essential organic chemical materials will generate a large amount of waste water and bring about water pollution problems. Refractory high organic nitrogen wastewater refers to wastewater containing a large amount of refractory organic matter and high organic nitrogen concentration. Most of the refractory high organic nitrogen wastewater contains toxic and refractory organic pollutants such as polycyclic aromatic hydrocarbons, halogenated hydrocarbons, heterocyclic compounds...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a heterogeneous Fenton catalyst LaFeO 3 / 3DOMCeO 2 , used to treat refractory high-organic nitrogen wastewater, the catalyst uses three-dimensional ordered macroporous cerium oxide as the carrier and perovskite oxide LaFeO 3 As a catalytic active component, the catalytic active component has a high degree of dispersion and a larger specific surface area, so that more active sites are exposed, and there is a greater opportunity to contact with the organic matter to be degraded, so as to solve the existing homogeneous Fenton catalytic pH Narrow scope of application, H 2 o 2 Technical problems such as low utilization rate and large iron sludge production

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