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Preparation method and application of core-shell structural magnetic nano composite 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. To achieve the effect of reuse, high-efficiency magnetic separation capability, and promotion of electron transfer

Active Publication Date: 2019-09-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 core-shell structural magnetic nano composite catalyst
  • Preparation method and application of core-shell structural magnetic nano composite catalyst
  • Preparation method and application of core-shell structural magnetic nano composite 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 core-shell structural magnetic nano composite catalyst. The method comprises the following steps: step 1, dissolving a metal salt X containing Fe<2+> and a metal salt Y containing Co<2+> into deionized water, and performing uniform stirring to obtain a mixed liquid A; step 2, removing dissolved oxygen in the mixed liquid A by ultrasonic vibration or suction filtration to obtain a mixed liquid B; step 3, adding a NaOH solution dropwise into the mixed liquid B to obtain a mixed liquid C; step 4, performing reflux on the mixed liquid C under heating and stirring, allowing the liquid to stand, taking out a product, performing alternated washing for a plurality of times by using deionized water and absolute ethanol, performing drying, and performing grinding to obtain a powdery magnetic cobalt iron hydroxide; and step 5, performing calcination on the powdered magnetic cobalt iron hydroxide, performing grinding, and performingsieving to obtain the core-shell structural magnetic nano composite catalyst using Co3O4 as a shell and CoFe2O4 as a core. The preparation method provided by the invention has a simple and easily-operated process, and can realize microscopic regulation on the morphology of the composite catalyst, and forms a core-shell structure, thereby facilitating electron transfer in a 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 Applications(China)
IPC IPC(8): B01J23/75C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J23/75B01J23/002C02F1/725C02F1/722C02F2101/30C02F2101/34C02F2101/36C02F2101/38B01J35/33
Inventor 赵志伟谭雅焕耿聰
Owner CHONGQING UNIV
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