Modified cuprous ferrite catalystrich in oxygen vacancies as well as preparation method and application thereof

A cuprous ferrite, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. The effect of reducing the dosage and improving the degradation effect

Active Publication Date: 2021-04-13
江苏东方维德环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, cuprous ferrite (CuFeO 2 ) has become a research hotspot due to its simple preparation, low cost and high catalytic performance, but CuFeO 2 Spontaneous aggregation due to its inherent high surface energy and low charge density can lead to a decrease in the number of active sites and catalytic efficiency

Method used

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  • Modified cuprous ferrite catalystrich in oxygen vacancies as well as preparation method and application thereof
  • Modified cuprous ferrite catalystrich in oxygen vacancies as well as preparation method and application thereof
  • Modified cuprous ferrite catalystrich in oxygen vacancies as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028] The invention provides a kind of preparation method of modified cuprous ferrite catalyst, comprising the following steps:

[0029] mixing the chitosan solution and the iron-copper metal salt solution, dropping the resulting mixed solution into alkali, and carrying out a precipitation reaction to obtain an iron-copper precipitation mixed solution coated with chitosan;

[0030] The chitosan-coated iron-copper precipitation mixed solution is subjected to hydrothermal reaction and dried to obtain a modified cuprous ferrite catalyst.

[0031] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0032] The invention mixes the chitosan solution and the iron-copper metal salt solution, drops the obtained mixed solution into the alkali, carries out the precipitation reaction, and obtains the iron-copper precipitation mixed solution coated with the chitosan. In the p...

Embodiment 1

[0045] 200mg chitosan was dissolved in 20mL 2% glacial acetic acid solution, and left to stand overnight to obtain chitosan solution; weigh 5mmol Cu(NO 3 ) 2 ·3H 2 O and 5 mmol FeSO 4 ·7H 2 O was dissolved in 10mL ultrapure water, and the obtained iron-copper metal salt solution was slowly added to the chitosan solution, stirred to make it evenly mixed, and then the obtained mixed solution was dropped into 30mL1.67mol / L NaOH aqueous solution drop by drop. , carry out the precipitation reaction at room temperature for 60 minutes, the obtained iron-copper precipitation mixed solution coated with chitosan is sonicated for 10 minutes, and then put into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and carry out hydrothermal reaction at 180 ° C for 12 hours. The obtained product was centrifugally washed until the surface of the product was neutral, and dried in vacuum at 60°C for 12 hours to obtain a modified cuprous ferrite catalyst, which was denoted ...

Embodiment 2

[0047] The difference between this embodiment and Example 1 is only that the amount of chitosan added is 100 mg, and the prepared catalyst is denoted as OV-CuFeO 2 @N-CNPs-100; In the prepared modified cuprous ferrite catalyst, the loading amount of nitrogen-doped carbon nanoparticles on the cuprous ferrite is 9.3%.

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Abstract

The invention provides a modified cuprous ferrite catalyst rich in oxygen vacancies as well as a preparation method and application of the modified cuprous ferrite catalyst, and belongs to the technical field of sewage treatment. According to the method, the hydrothermal deacetylation degree of chitosan in an alkaline hydrothermal environment is increased, chitosan can be hydrolyzed into chitosan oligosaccharide and glucosamine, and meanwhile, the pH value of the solution is increased; the glucosamine is unstable in nature and easily consumes oxygen to generate Maillard non-enzymatic browning reaction to generate reducing ketones, unsaturated aldehydes and aromatic ring substances (such as pyrazine heterocycles, pyrans, furans and pyrroles), so that an anoxic reduction environment is formed, and the environment is beneficial for cuprous ferrite CuFeO2 to form a large number of oxygen vacancies; and meanwhile, the reducing ketones and unsaturated aldehydes generated by hydrolysis of chitosan are used as reducing agents for synthesis of cuprous ferrite CuFeO2, and chitosan is derived into nitrogen-doped carbon nanoparticles, so that the modified cuprous ferrite catalyst rich in oxygen vacancies is obtained.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a modified cuprous ferrite catalyst rich in oxygen vacancies and its preparation method and application. Background technique [0002] In recent years, advanced oxidation process has been widely used in sewage treatment. The Fenton reaction is one of the most effective methods, which can generate the second largest oxidant hydroxyl radical after fluorine to effectively degrade pollutants. The Fenton method has the advantages of simple operation, mild reaction conditions, high degradation efficiency and cheap raw materials. However, there are certain defects in the traditional homogeneous Fenton reaction, for example, the reaction needs to be carried out at about pH=3; a large amount of iron sludge will be produced in the follow-up, and secondary pollution of acid or metal ions may even be generated. [0003] In order to overcome these problems, researchers have used ce...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/03B01J37/10C02F1/72C02F101/38C02F101/34C02F101/36
CPCB01J27/24B01J37/10B01J37/031C02F1/722C02F1/725C02F2305/026C02F2305/023C02F2101/38C02F2101/34C02F2101/308C02F2101/36Y02W10/37
Inventor 刘波王梦良周德超汪中杰
Owner 江苏东方维德环保科技有限公司
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