Preparation method and application of a core-shell magnetic nanocomposite catalyst

A composite catalyst, magnetic nanotechnology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of inefficient removal of new organic pollutants, etc. Achieve the effect of reuse, high-efficiency magnetic separation capability, and light weight

Active Publication Date: 2022-02-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the process of urbanization in my country, the expansion scale and speed of sewage treatment plants are increasing, but the traditional sewage treatment process is generally inefficient for the removal of this new type of organic pollutants that are difficult to degrade.

Method used

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  • Preparation method and application of a core-shell magnetic nanocomposite catalyst
  • Preparation method and application of a core-shell magnetic nanocomposite catalyst
  • Preparation method and application of a core-shell magnetic nanocomposite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment one, a kind of preparation method of core-shell structure magnetic nanocomposite catalyst, it comprises the steps:

[0035] S1, will contain Fe 2+ Metal salt X and containing Co 2+ The metal salt Y was dissolved in deionized water, the molar ratio of the metal salt X and the metal salt Y was 1:0.75, and stirred for 10 minutes to obtain the mixed solution A;

[0036] S2, by removing the dissolved oxygen in the mixed solution A, to obtain the mixed solution B;

[0037] S3, using the automatic dropwise method of peristaltic pump, adding NaOH solution with a concentration of 0.5mol / L to the mixed solution B dropwise and stirring at a temperature of 25°C, adjusting the pH value of the mixed solution B to 9, Continue to stir to obtain a dark green reaction precursor solution to obtain a mixed solution C;

[0038] S4, transfer the mixed solution C into a water bath, heat under reflux at a temperature of 30° C. and stir for 14 hours, then let it stand for 2 hours,...

Embodiment 2

[0040] Embodiment 2, a method for preparing a magnetic nanocomposite catalyst with a core-shell structure, which comprises the following steps:

[0041] S1, will contain Fe 2+ Metal salt X and containing Co 2+ The metal salt Y was dissolved in deionized water, the molar ratio of the metal salt X and the metal salt Y was 1:0.5, and stirred for 15 minutes to obtain the mixed solution A;

[0042] S2, removing the dissolved oxygen in the mixed solution A through ultrasonic vibration to obtain the mixed solution B;

[0043] S3, using a burette to manually drop, add the NaOH solution with a concentration of 2mol / L to the mixed solution B drop by drop and stir at a temperature of 15°C, adjust the pH value of the mixed solution B to 12, and continue to stir A dark green reaction precursor solution was obtained, and a mixed solution C was obtained;

[0044] S4, transfer the mixed solution C into a water bath, heat and stir under reflux at a temperature of 20°C for 10 h, then let it ...

Embodiment 3

[0046] Embodiment three, a kind of preparation method of core-shell structure magnetic nanocomposite catalyst, it comprises the following steps:

[0047] S1, will contain Fe 2+ Metal salt X and containing Co 2+ The metal salt Y is dissolved in deionized water, the molar ratio of the metal salt X and the metal salt Y is 1:1, and stirred for 20 minutes to obtain the mixed solution A;

[0048] S2, removing the dissolved oxygen in the mixed solution A through ultrasonic vibration to obtain the mixed solution B;

[0049] S3, using the automatic dropwise addition method of the peristaltic pump, adding the NaOH solution with a concentration of 0.1mol / L to the mixed solution B dropwise and stirring at a temperature of 30°C, adjusting the pH value of the mixed solution B to 10, Continue to stir to obtain a dark green reaction precursor solution to obtain a mixed solution C;

[0050] S4, transfer the mixed solution C into a water bath, heat and stir under reflux at a temperature of 4...

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Abstract

The invention discloses a preparation method and application of a magnetic nanocomposite catalyst with a core-shell structure, comprising the following steps: S1, comprising Fe 2+ Metal salt X and containing Co 2+ Dissolve the metal salt Y in deionized water, stir evenly, to the mixed solution A; S2, remove the dissolved oxygen in the mixed solution A by ultrasonic vibration or suction filtration, and obtain the mixed solution B; S3, add the NaOH solution dropwise to the mixed solution In liquid B, mixed liquid C is obtained; in S4, the mixed liquid C is refluxed, heated and stirred, and the product is taken out after standing still, and washed multiple times with deionized water and absolute ethanol, then dried and ground to obtain powdered magnetic cobalt Iron hydroxide; S5, the powdered magnetic cobalt-iron hydroxide is calcined, ground and sieved to obtain the 3 o 4 For the shell, CoFe 2 o 4 A magnetic nanocomposite catalyst with a core-shell structure as the core. The preparation process is simple and easy to operate, and it can realize the microscopic control of the composite catalyst morphology, form a core-shell structure, and help the electron transfer in the catalytic reaction process.

Description

technical field [0001] The invention relates to wastewater treatment technology, in particular to a preparation method and application of a magnetic nanocomposite catalyst with a core-shell structure. Background technique [0002] Antibiotics refer to a class of secondary metabolites produced by microorganisms (including bacteria, fungi, and actinomycetes) or higher animals and plants in the course of life that have anti-pathogen or other activities, and can interfere with the developmental functions of other living cells Chemical material. Since Fleming discovered penicillin in 1928, various antibiotics have gradually come out and been widely used in medical treatment, animal husbandry, aquaculture, and agriculture. Most of the antibiotics used on humans and animals enter the water social cycle through excretion and discharge, enter the drinking water system through sewage treatment plants and rivers, and finally circulate continuously in the biosphere, and occur in the hu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J23/75B01J23/002B01J35/0033C02F1/725C02F1/722C02F2101/30C02F2101/34C02F2101/36C02F2101/38
Inventor 赵志伟谭雅焕耿聰
Owner CHONGQING UNIV
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