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Preparation method and application of a magnetic oxygen-deficient copper ferrite catalyst

A technology of copper ferrite and catalyst is applied in the field of preparation of oxygen-deficient copper ferrite catalyst, which can solve the problems of unsatisfactory catalytic effect, inability to widely use carcinogenic effect, weak catalytic performance and the like

Active Publication Date: 2019-08-30
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fe 2+ Under neutral conditions, it can effectively catalyze persulfate to produce sulfate radicals, but under neutral conditions Fe 2+ easily oxidized to Fe 3+ thereby inactivating
and excess Fe 2+ Will combine with sulfate free radicals to reduce oxidation capacity
[0004] Among them Co 2+ Although it has high catalytic performance, its carcinogenic effect leads to Co 2+ not widely applicable
As another commonly used catalyst, iron oxide often requires additional energy input, such as ultrasound and UV, due to its weak catalytic performance, thereby increasing the processing cost.
[0005] At present, the widely used copper ferrite catalyst has a good effect on catalyzing PMS, but the catalytic effect on PS is not ideal.

Method used

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  • Preparation method and application of a magnetic oxygen-deficient copper ferrite catalyst
  • Preparation method and application of a magnetic oxygen-deficient copper ferrite catalyst
  • Preparation method and application of a magnetic oxygen-deficient copper ferrite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add copper nitrate and ferric nitrate to deionized water, and then add citric acid after dissolving. The molar ratio of the above-mentioned copper nitrate, ferric nitrate, and citric acid is 1:2:3.5; the total volume is 200ml, and the molar ratio of copper nitrate The concentration is 0.025mol / L.

[0032] (2) The solution obtained in step (1) was magnetically stirred in an oil bath at 60°C for 4 hours, and when about 100 mL of the solution remained, the solution was dried in an oven at 70°C until a gel was formed;

[0033] (3) The gel obtained in step (2) was calcined at 300°C for 2 hours to degumming, and after natural cooling and grinding, the following figure 1 the first component shown;

[0034] (4) Place the first component in a hydrogen atmosphere at 300°C for 3 hours, and take it out after natural cooling to obtain the following figure 2 The oxygen-deficient copper ferrite catalyst shown is stored in a nitrogen atmosphere;

[0035] 100 mL of paracetamol s...

Embodiment 2

[0037] (1) Add copper nitrate and ferric nitrate to deionized water, and then add citric acid after dissolving. The molar ratio of the above-mentioned copper nitrate, ferric nitrate, and citric acid is 1:2:4; the total volume is 200ml, and the molar ratio of copper nitrate The concentration is 0.025mol / L.

[0038] (2) Magnetically stir the solution obtained in step (1) in an oil bath at 70°C for 4 hours. When about 50 mL of the solution remains, dry the solution in an oven at 60°C until a gel is formed;

[0039] (3) The gel obtained in step (2) is calcined at 500° C. for 3 hours to degumming, and the first component is obtained after natural cooling and grinding;

[0040] (4) Place the first component in a hydrogen atmosphere at 400°C for 1 hour for reduction, take it out after natural cooling to obtain an oxygen-deficient copper ferrite catalyst, and store it in a nitrogen atmosphere;

Embodiment 3

[0042] (1) Add copper nitrate and ferric nitrate to deionized water, and then add citric acid after dissolving. The molar ratio of the above-mentioned copper nitrate, ferric nitrate, and citric acid is 1:2:3.5; the total volume is 200ml, and the molar ratio of copper nitrate The concentration is 0.025mol / L.

[0043] (2) The solution obtained in step (1) was magnetically stirred in an oil bath at 50°C for 6 hours, and when about 75mL of the solution remained, the solution was dried in an oven at 80°C until a gel was formed;

[0044] (3) The gel obtained in step (2) is calcined at 200° C. for 5 hours to degumming, and the first component is obtained after natural cooling and grinding;

[0045] (4) Place the first component in a hydrogen atmosphere at 200°C for 8 hours, take it out after natural cooling to obtain an oxygen-deficient copper ferrite catalyst, and store it in a nitrogen atmosphere;

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Abstract

The invention discloses a preparation method and application of an oxygen-potential-deficiency magnetic copper ferrite catalyst. The preparation method comprises the following steps: (1) dissolving copper nitrate and iron nitrate into de-ionized water at the mol ratio of 1 to 2 and adding a certain amount of sodium citrate; (2) magnetically stirring the material obtained by the step (1) in an oil bath; (3) taking out the material obtained by the step (2) and drying to form sol; (4) calcining the sol obtained by the step (3) in a muffle furnace to obtain a first component; (5) reducing the first component in a hydrogen atmosphere to obtain the oxygen-potential-deficiency magnetic copper ferrite catalyst. The oxygen-potential-deficiency magnetic copper ferrite catalyst prepared by the preparation method can be used for effectively catalyzing persulfate and the catalyst is magnetic and can be used again after being magnetically separated.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of an oxygen-deficient copper ferrite catalyst. Background technique [0002] Oxidation method, as an important component in the treatment of wastewater containing organic matter, can effectively remove organic matter that is difficult to biodegrade. Fenton and Fenton-like reactions are widely used in chemical oxidation methods. The advantage is that the generated hydroxyl radicals have strong oxidizing properties, and can oxidize most organic substances indiscriminately to achieve the purpose of removing pollutants. However, due to its relatively harsh requirements on reaction conditions (pH value is about 3), H 2 o 2 The price is expensive, the storage is difficult, and the subsequent biochemical treatment needs to adjust the pH of the influent water, resulting in high treatment costs. [0003] Based on the sulfate radical (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C02F1/72C02F101/30
Inventor 洪俊明张圆春张倩
Owner HUAQIAO UNIVERSITY
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