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

A heterogeneous Fenton and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low utilization rate, narrow application range, and large iron slime production, etc. Achieve low Fe leaching concentration, solve the effect of narrow pH application range and simple preparation method

Pending Publication Date: 2022-07-22
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

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Embodiment 1

[0046] This example prepares a heterogeneous Fenton catalyst LaFeO 3 / 3DOMCeO 2 , the catalyst is based on three-dimensional ordered macroporous ceria (3DOMCeO 2 ) as the carrier material, with LaFeO 3 It is a composite catalyst of catalytically active components. Its preparation method is as follows:

[0047] (1) Add 3 mL of deionized water, 1 mL of glacial acetic acid, 3 g of cerium source and 5 g of PMMA microspheres (2 μm in diameter) to 20 mL of absolute ethanol, ultrasonicate for 30 min, keep stirring, evaporate the water at 60 °C to gel and then dry A carrier precursor is obtained.

[0048] (2) The carrier precursor was placed in a tube furnace, and calcined at 500 °C for 3 h and 800 °C for 5 h in an air atmosphere to obtain three-dimensional ordered macroporous ceria 3DOMCeO 2 .

[0049] (3) Dissolve 8.66g lanthanum salt (lanthanum nitrate hexahydrate), 8.07g iron salt (iron nitrate nonahydrate) and 8.40g citric acid (molar ratio 1:1:2) in 200mL deionized water, ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/02B01J35/10C02F1/72C02F101/38
CPCB01J23/83B01J23/002B01J37/0209B01J35/1004C02F1/722C02F1/725B01J2523/00C02F2305/026C02F2101/38B01J2523/3706B01J2523/3712B01J2523/842
Inventor 李再兴李超陈平陈晓飞祁浩杰张琴琴张晨阳邢倩
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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