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Heterogeneous Fenton catalyst, preparation method thereof and wastewater treatment method

A waste water treatment, heterogeneous technology, applied in special compound water treatment, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problem of insufficient catalytic effect, achieve low cost, high yield and high removal rate high effect

Pending Publication Date: 2021-12-28
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the prior art also has magnetic nanometer MnFe 2 o 4 Related reports on surface modification, but the catalytic effect is still not good enough

Method used

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  • Heterogeneous Fenton catalyst, preparation method thereof and wastewater treatment method
  • Heterogeneous Fenton catalyst, preparation method thereof and wastewater treatment method
  • Heterogeneous Fenton catalyst, preparation method thereof and wastewater treatment method

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preparation example Construction

[0036] The application also provides a preparation method of heterogeneous Fenton catalyst, comprising:

[0037] to MnFe 2 o 4 Carrying out sulfonic acid group modification to obtain sulfonic acid group modified MnFe 2 o 4 .

[0038] Preferably, for the MnFe 2 o 4 Carry out sulfhydryl modification to obtain thiol-modified MnFe 2 o 4 , the sulfhydryl-modified MnFe 2 o 4 Oxidation is carried out to obtain the MnFe modified by the sulfonic acid group 2 o 4 .

[0039] Preferably, the MnFe 2 o 4 Dispersed in absolute ethanol, adding 3-mercaptopropyltriethoxysilane to react to obtain the mercapto-modified MnFe 2 o 4 .

[0040] Preferably, the thiol-modified MnFe 2 o 4 React with hydrogen peroxide solution and concentrated sulfuric acid to obtain the thiol-modified MnFe 2 o 4 .

[0041] Preferably, after adding 3-mercaptopropyltriethoxysilane, the N 2 React under protection for 20-40 minutes, and then move the reaction system to a water bath at 35-45°C for 20-30...

Embodiment 1

[0049] This embodiment provides a magnetic nano-MnFe functionalized with sulfonic acid group 2 o 4 The preparation method of heterogeneous Fenton catalyst, concrete preparation process is as follows:

[0050] With the aid of ultrasound, 1.0 g of MnFe 2 o 4 Disperse in absolute ethanol, add 2mL of 3-mercaptopropyltriethoxysilane (MPTES) dropwise after 10min, after ultrasonication for 20min, in N 2 React under protection for 30 minutes, then move the reaction system to a 40°C water bath for 24 hours, wash the obtained product with absolute ethanol several times, magnetically separate it, and dry it in vacuum for 24 hours to obtain the mercapto-functionalized MnFe 2 o 4 magnetic nanoparticles.

[0051] Take 0.2g of the obtained thiol-modified MnFe 2 o 4 Add magnetic nanoparticles into a round bottom flask, add 20mL of ultrapure water, ultrasonically disperse for 20min, then add 5mL of hydrogen peroxide aqueous solution (30%), add 1 drop of concentrated sulfuric acid as an ...

Embodiment 2

[0053] The MnFe of the sulfonic group functionalization that embodiment 1 obtains 2 o 4 The crystal structure was analyzed by X-ray diffraction. When the crystal is irradiated by X-rays, the atoms in it scatter X-rays to the surroundings. Since the crystal has a periodic structure, these scattered X-rays interfere with each other, and diffraction lines only occur in certain specific directions. This phenomenon is called X-rays. ray diffraction. Various crystalline substances have different crystal structures, and the directions and relative intensities of their diffraction lines are also different.

[0054] The results of X-ray diffraction analysis are as follows: figure 1 shown by figure 1 It can be seen that in the X-ray diffraction spectrum (XRD), MnFe appears at 18.07°, 30.62°, 36.05°, 43.72°, 54.12°, 57.72° and 63.32° 2 o 4 The characteristic diffraction peaks of (111), (220), (311), (400), (422), (511), and (440) crystal planes of the spinel structure, indicating t...

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Abstract

The invention provides a heterogeneous Fenton catalyst, a preparation method thereof and a wastewater treatment method, the heterogeneous Fenton catalyst performs sulfonic group functional modification on magnetic nano MnFe2O4, agglomeration of the magnetic nano MnFe2O4 can be inhibited by increasing steric hindrance and electrostatic repulsion, the sulfonic group introduced on the surface can change the electronic structure of MnFe2O4, the redox cycle among Fe < 3 + > / Fe < 2 + >, Mn < 3 + > / Mn < 2 + > and Mn < 3 + > / Fe < 2 + > is accelerated, so that the heterogeneous Fenton catalytic activity of MnFe2O4 is improved.

Description

technical field [0001] The present application relates to the field of wastewater treatment technology, in particular to a heterogeneous Fenton catalyst, a preparation method thereof, and a wastewater treatment method. Background technique [0002] Heterogeneous Fenton oxidation is a common advanced oxidation technique, which catalyzes H on the surface of a solid catalyst 2 o 2 Decomposition produces strong oxidizing hydroxyl radical·OH, and the reactants and products will not cause secondary pollution to the environment. It is considered to be an effective way to deal with antibiotics in refractory water. Nano MnFe 2 o 4 Due to the advantages of low price, environmental friendliness, strong stability and magnetic properties, it has been widely used in heterogeneous Fenton catalysts. Magnetic Nano MnFe 2 o 4 As a heterogeneous Fenton catalyst, it can not only make full use of the catalytic activity of iron and manganese double metal oxides, but also use its own magneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/02C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J27/02C02F1/722C02F1/725C02F2101/30C02F2101/34C02F2101/36C02F2101/38C02F2305/023C02F2305/026B01J35/23B01J35/33
Inventor 秦航道杨应昌石维
Owner TONGREN UNIV
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