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Preparation method of magnetic oxygen deficient cobalt ferrite bimetal oxide composite catalyst

A bimetallic oxide and composite catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc. Realize recycling and improve the effect of electron transfer ability

Inactive Publication Date: 2019-02-12
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few studies on the application of oxygen vacancies in AOPs, and no studies on the use of oxygen vacancy catalysts to catalyze PS have been found.

Method used

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  • Preparation method of magnetic oxygen deficient cobalt ferrite bimetal oxide composite catalyst
  • Preparation method of magnetic oxygen deficient cobalt ferrite bimetal oxide composite catalyst

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Embodiment 1

[0031] (1) Under vigorous stirring, add Co(NO 3 ) 2 ·3H 2 O, Fe(NO 3 ) 3 9H 2 O and citric acid.

[0032] (2) Transfer the solution obtained in step (1) to an oil bath, stir magnetically at 50-70°C for 3-5h, then place the fully stirred solution in an oven, and dry at 80-100°C for 4-7h, to obtain a xerogel.

[0033] (3) Put the above dry gel in a muffle furnace, heat up to 280-320°C at a heating rate of 10°C / min, then calcinate for 2-4h, cool to room temperature, take it out, and grind to obtain black CoFe 2 o 4 (CFO) powder.

[0034] (4) the black CoFe prepared by step (3) 2 o 4 The powder is placed in a tube furnace and calcined at 280-320°C for 3h in a hydrogen atmosphere with a flow rate of 0.08-0.12mL / min to obtain the following: figure 1 The magnetic oxygen-deficient cobalt ferrite double metal oxide composite catalyst shown.

[0035] Add 100 mL of bisphenol A solution containing 30 mg / L to the reactor, then add sodium persulfate and the magnetic oxygen-defic...

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Abstract

The invention discloses a preparation method of a magnetic oxygen deficient cobalt ferrite bimetal oxide composite catalyst. In the preparation method provided by the invention, an oxygen vacancy is introduced into CoFe2O4(CFO) with a hydrogen reduction method to prepare oxygen deficient CoFe2O4(HCFO), so that the electron transfer capacity of the catalyst is improved, and the amount of catalyticsites is increased; the catalytic activity of the catalyst is strengthened through the synergistic effect of the oxygen vacancy and transition metal; and the oxygen deficient CoFe2O4(HCFO) can effectively activate persulfate to produce a great quantity of free radicals to degrade organic matters which are difficult to degrade in water. The prepared magnetic oxygen deficient cobalt ferrite bimetaloxide composite catalyst has very strong magnetism, can realize recovery utilization of the catalyst and reduces secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a magnetic oxygen-deficient cobalt ferrite double metal oxide composite catalyst. Background technique [0002] Advanced Oxidation Process (AOPs) is a sewage treatment technology that can use external energy to generate highly active free radicals (such as OH) to achieve rapid oxidation and degradation of pollutants. In the early days, AOPs technology mainly refers to the oxidation technology based on OH, and its types are Fenton oxidation, O 3 Oxidation method, ultrasonic method, etc. Among them, the Fenton method is a commonly used oxidation form, and its principle is H 2 o 2 Under the activation of the catalyst, OH free radicals with high activity and low selectivity are generated. Common catalytic methods include ultraviolet (UV) light irradiation, electrical assistance, ultrasound and transition metal ion (iron, copper, cobalt, silve...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J37/08B01J37/18C02F1/72C02F101/30C02F101/34
CPCC02F1/725B01J23/002B01J23/75B01J37/088B01J37/18C02F2101/30C02F2101/345B01J35/33
Inventor 洪俊明吴丽颖张倩董正玉王霁
Owner HUAQIAO UNIVERSITY
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