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A kind of nano ferroferric oxide/graphene composite Fenton catalytic film and its preparation method and application

A composite technology of ferric oxide and graphene, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the limitations of popularization and application, large chemical sludge, The optimal pH range is narrow and other problems, to achieve the effect of wide applicable pH range, improving utilization efficiency, and inhibiting self-quenching

Active Publication Date: 2021-12-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional homogeneous Fenton technology usually uses ferrous or ferric ions as the catalyst, which has the disadvantages of narrow optimal pH range and large amount of chemical sludge, which greatly limits the popularization and application of the traditional homogeneous Fenton technology.
The heterogeneous Fenton technology system uses solid catalysts (such as nanomaterials), has no disadvantages of chemical sludge, and is applicable to a wider pH range. However, because hydroxyl radicals are prone to self-quenching in water, the lifespan is generally considered to be less than 20 microseconds, so mass transfer of free radicals and pollutants tends to be the rate-limiting step in the heterogeneous Fenton reaction

Method used

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  • A kind of nano ferroferric oxide/graphene composite Fenton catalytic film and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of a nano-ferric oxide / graphene composite Fenton catalytic membrane: Disperse 50 mg of single-layer graphene oxide nanosheets in 40 mL of ethylene glycol, add 0.05 g of ferric chloride hexahydrate, 1.8 g of sodium acetate, 0.02 g of sodium citrate, stirred by ultrasound and magnetic force until the solution was uniform, and used solvothermal method at 200°C for 4 hours to make ferric oxide nanoparticles grow in situ on the surface of graphene oxide nanosheets, then naturally cooled to room temperature, and then ethanol, Wash the obtained nano ferric oxide / reduced graphene oxide composite nanomaterial with ion water, dry it in vacuum at 40° C. for 8 hours, and then use it. Disperse 2 mg of composite nanomaterials and 1 mg of palygorskite nanorods in 200 mL of deionized water, mix them uniformly with ultrasound, and filter them onto a polyethersulfone microfiltration membrane, so that the composite nanomaterials and palygorskite self-assemble to form a membrane...

Embodiment 2

[0032] Preparation of a nano-ferric oxide / graphene composite Fenton catalytic membrane: Disperse 50 mg of single-layer graphene oxide nanosheets in 40 mL of ethylene glycol, add 0.10 g of ferric chloride hexahydrate, 1.8 g of sodium acetate, 0.02 g of sodium citrate, stirred by ultrasound and magnetic force until the solution was uniform, and used solvothermal method at 200°C for 4 hours to make ferric oxide nanoparticles grow in situ on the surface of graphene oxide nanosheets, then naturally cooled to room temperature, and then ethanol, Wash the obtained nano ferric oxide / reduced graphene oxide composite nanomaterial with ion water, dry it in vacuum at 40° C. for 8 hours, and then use it. Disperse 2 mg of composite nanomaterials and 1 mg of palygorskite nanorods in 200 mL of deionized water, mix them uniformly with ultrasound, and filter them onto a polyethersulfone microfiltration membrane, so that the composite nanomaterials and palygorskite self-assemble to form a membrane...

Embodiment 3

[0035] Preparation of a nano-ferric oxide / graphene composite Fenton catalytic membrane: Disperse 50 mg of single-layer graphene oxide nanosheets in 40 mL of ethylene glycol, add 0.15 g of ferric chloride hexahydrate, 1.8 g of sodium acetate, 0.02 g of sodium citrate, stirred by ultrasound and magnetic force until the solution was uniform, and used solvothermal method at 200°C for 4 hours to make ferric oxide nanoparticles grow in situ on the surface of graphene oxide nanosheets, then naturally cooled to room temperature, and then ethanol, Wash the obtained nano ferric oxide / reduced graphene oxide composite nanomaterial with ion water, dry it in vacuum at 40° C. for 8 hours, and then use it. Disperse 2 mg of composite nanomaterials and 1 mg of palygorskite nanorods in 200 mL of deionized water, mix them uniformly with ultrasound, and filter them onto a polyethersulfone microfiltration membrane, so that the composite nanomaterials and palygorskite self-assemble to form a membrane...

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Abstract

The invention provides a nanometer ferric oxide / graphene composite Fenton catalytic membrane and its preparation method and application. The method first uses a solvothermal method to prepare a composite of reduced graphene oxide nanosheets loaded with nanometer ferric oxide particles. The material is based on a microfiltration membrane, and a nano-ferric oxide / graphene composite Fenton catalytic membrane is prepared by a self-assembly method. The catalytic membrane can effectively activate hydrogen peroxide in water, and then realize the efficient removal of refractory organic pollutants in water. Compared with the homogeneous Fenton reaction and the heterogeneous Fenton reaction catalyzed by nanomaterials, the catalytic membrane will The strong oxidizing species and pollutants produced by the activation are confined in the nanoscale space formed between the nanosheets, and this nanoconfinement effect increases the reaction kinetic coefficient by two to three orders of magnitude. The nano ferric oxide / graphene composite Fenton catalytic membrane prepared by the invention has the advantages of high catalytic efficiency and stable membrane flux.

Description

technical field [0001] The invention belongs to the technical field of catalytic membranes used in water treatment, and in particular relates to a nanometer iron ferric oxide / graphene composite Fenton catalytic membrane and its preparation method and application. Background technique [0002] With the widespread application of synthetic organic substances such as medicines and personal care products in social life and the rapid development of industry and agriculture, a variety of toxic, harmful and refractory organic substances enter urban water supply systems and natural water bodies through various channels, causing potential public health problems. Health and environmental risks. Conventional treatment methods are usually unable to effectively remove these trace or trace amounts of refractory organics from water. Therefore, advanced oxidation technology for refractory organics has been more and more widely studied and applied in recent years. [0003] Among the existing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J37/10B01J37/34C02F1/72C02F101/30
Inventor 王志伟李胄彦李洋伊秋颖戴若彬李佳艺
Owner TONGJI UNIV
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