Three-dimensional graphene-based heterogeneous Fenton catalyst, and preparation method and application thereof

A heterogeneous Fenton, graphene-based technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low electron migration cycle rate, achieve excellent adsorption performance and non-toxic Homogeneous Fenton catalytic performance, easy solid-liquid separation, and simple and easy preparation methods

Active Publication Date: 2019-03-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The heterogeneous Fenton reaction overcomes the problem that the traditional homogeneous Fenton reaction is easy to produce iron sludge, but it still has the limitation of low electron transfer cycle rate

Method used

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  • Three-dimensional graphene-based heterogeneous Fenton catalyst, and preparation method and application thereof
  • Three-dimensional graphene-based heterogeneous Fenton catalyst, and preparation method and application thereof
  • Three-dimensional graphene-based heterogeneous Fenton catalyst, and preparation method and application thereof

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preparation example Construction

[0018] Specifically, the preparation method of the three-dimensional graphene-based heterogeneous Fenton catalyst of the present invention comprises the following steps:

[0019] Step 1, preparing sodium alginate solution and metal ion solution, mixing them to obtain alginate gel;

[0020] In step 2, the alginate gel obtained in step 1 is calcined at a high temperature under the catalysis of a protective atmosphere and a metal substrate to obtain the three-dimensional graphene-based heterogeneous Fenton catalyst.

[0021] Wherein, the concentration of sodium alginate in the sodium alginate solution in step 1 is 0.1-200 mg / mL, more preferably 20-80 mg / mL. The sodium alginate solution is, for example, an aqueous solution of sodium alginate. The sodium alginate can be selected from natural biomacromolecule sodium alginate, and the water can be selected from purified water, distilled water or deionized water.

[0022] Wherein, the metal ions in the metal ion solution in step 1 ar...

Embodiment 1

[0031] Prepare 100mL 20mg / L sodium alginate solution, prepare 100mL 20mg / L FeSO 4 solution, adding sodium alginate solution dropwise to FeSO 4 The solution was left to stand for 24 hours to obtain iron alginate gel balls. Iron alginate gel balls in N 2 Protected and catalyzed by a nickel substrate, it was calcined at 800 °C for 6 hours to obtain a three-dimensional graphene iron-based aerogel, and its transmission electron microscope picture is as follows figure 1 As shown, the visible product is multilayer graphene, and its Raman spectrum is shown as figure 2 As shown, the appearance of two graphene characteristic peaks of D peak and G peak further confirms that the product is graphene. The specific surface area of ​​the material is 450m 2 / g, the removal rate of 50mg / L tetracycline heterogeneous Fenton in water is as high as 99.3% within 60min.

Embodiment 2

[0033] Prepare 100mL 20mg / L sodium alginate solution, prepare 100mL 20mg / L Co(N0 3 ) 2 solution, adding sodium alginate solution dropwise to Co(NO 3 ) 2 The solution was left to stand for 24 hours to obtain cobalt alginate gel balls. cobalt alginate gel balls in N 2 Protected and catalyzed by a nickel substrate, it was calcined at 800 °C for 6 hours to obtain a three-dimensional graphene cobalt-based aerogel, and its transmission electron microscope picture is as follows image 3 As shown, the visible product is multilayer graphene, and the sheet thickness is higher than that of graphene iron-based aerogel.

[0034] image 3 It is a transmission electron micrograph of the three-dimensional graphene cobalt-based airgel prepared by using iron alginate in the present invention.

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Abstract

The invention discloses a three-dimensional graphene-based heterogeneous Fenton catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1)preparation of a sodium alginate solution and a metal ion solution, and mixing for obtaining an alginate gel; and (2) high-temperature calcination of the above alginate gel in a protective atmosphereunder the catalysis of a metal substrate to obtain the high-quality three-dimensional graphene-based heterogeneous Fenton catalyst. Graphene and a metal catalysis component in the final product are combined by firm covalent bonds, so electron transport is promoted, the heterogeneous Fenton catalysis performance is improved, and the problem of metal ion leakage is avoided. Sodium alginate utilizedby the preparation method is a natural biological macromolecule with a wide source and a low cost, so the preparation method has the advantages of simplicity, high efficiency, greenness and environmental protection, and the obtained product is uniform and porous, has a controllable shape, has excellent adsorption performance and excellent heterogeneous Fenton catalysis property, and achieves easyseparation of the solid and liquid.

Description

technical field [0001] The invention belongs to the research field of environmental functional materials, relates to a Fenton catalyst used for Fenton catalytic oxidation treatment, and more specifically relates to a three-dimensional graphene-based heterogeneous Fenton catalyst, its preparation method and its application. Background technique [0002] In recent years, environmental pollution has become increasingly serious, and many persistent organic pollutants are difficult to remove through traditional physical or biological means. As a result, advanced oxidation technologies with the advantages of efficient degradation of pollutants have attracted widespread attention, among which Fenton catalytic oxidation technology is a typical representative . The heterogeneous Fenton reaction overcomes the problems of the traditional homogeneous Fenton reaction, such as easy generation of iron sludge, but it still has the limitation of low electron transfer cycle rate. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J27/25C02F1/72C02F101/30
CPCB01J27/053B01J27/25C02F1/722C02F1/725C02F2101/30C02F2305/026
Inventor 庄媛石宝友王雪纯
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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