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Ferro-chrome composite oxide and preparation method and application thereof

A composite oxide, iron-chromium technology, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of increasing the cost of sewage treatment, consumption of large sulfuric acid and sodium hydroxide, etc., to achieve high sewage treatment efficiency, simple operation, and cost reduction Effect

Inactive Publication Date: 2013-01-30
W STARTECH BEIJING ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this treatment method needs to consume a large amount of sulfuric acid and sodium hydroxide, increasing the cost of sewage treatment

Method used

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  • Ferro-chrome composite oxide and preparation method and application thereof
  • Ferro-chrome composite oxide and preparation method and application thereof
  • Ferro-chrome composite oxide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0029] S1, add 26ml of water to the mixture of 16g ​​sodium hydroxide and 7.65g sodium nitrate, stir until the solids are all dissolved to obtain the first mixed solution;

[0030] S2, under stirring, add dropwise hydrochloric acid with a concentration of 1.3 mol / L to a mixture of 5.35665 g of chromium trichloride hexahydrate and 50.2358 g of ferrous sulfate heptahydrate, and stir until all the solids are dissolved to obtain a second mixed solution;

[0031] S3, under an inert gas environment, after heating the second mixed solution to 96°C, add the first mixed solution prepared in S1 dropwise at a rate of 11ml / min until the addition is completed;

[0032] S4, keep the reaction solution obtained in S3 at 95°C for 2 hours, then cool to 25°C, centrifuge, separate the solid, then wash the solid with deionized water, dry the washed solid to obtain the iron-chromium composite oxide .

[0033] The particle size of the prepared iron-chromium composite oxide is 30nm.

[0034] Use th...

preparation Embodiment 2

[0037] S1, add 10ml of water to the mixture of 16g ​​sodium hydroxide and 7.65g sodium nitrate, stir until the solids are all dissolved, to obtain the first mixed solution;

[0038] S2, under stirring, add dropwise hydrochloric acid with a concentration of 1.2mol / L to a mixture of 5.35665g chromium trichloride hexahydrate and 87.5422g ferrous sulfate heptahydrate, and stir until all the solids are dissolved to obtain a second mixed solution;

[0039] S3, under an inert gas environment, after heating the second mixed solution to 90°C, add the first mixed solution prepared in S1 dropwise at a rate of 5ml / min until the addition is completed;

[0040] S4, keep the reaction solution obtained in S3 at 92°C for 2 hours, then cool to 23°C, centrifuge, separate the solid, then wash the solid with deionized water, dry the washed solid to obtain the iron-chromium composite oxide .

[0041] The particle size of the obtained iron-chromium composite oxide is 23nm, and the structural formul...

preparation Embodiment 3

[0044] S1, add 50ml water to the mixture of 16g ​​sodium hydroxide and 7.65g sodium nitrate, stir until all solids are dissolved, obtain the first mixed solution;

[0045] S2, under stirring, add dropwise hydrochloric acid with a concentration of 1.1 mol / L to a mixture of 5.35665 g of chromium trichloride hexahydrate and 30.0790 g of ferrous sulfate heptahydrate, and stir until all the solids are dissolved to obtain a second mixed solution;

[0046] S3, under an inert gas environment, after heating the second mixed solution to 100°C, add the first mixed solution prepared in S1 dropwise at a rate of 15ml / min until the addition is completed;

[0047] S4, keep the reaction solution obtained in S3 at 96°C for 2 hours, then cool to 27°C, centrifuge, separate the solid, then wash the solid with deionized water, dry the washed solid to obtain the iron-chromium composite oxide .

[0048]The obtained iron-chromium composite oxide has a particle size of 25 μm and a structural formula o...

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Abstract

The invention provides a ferro-chrome composite oxide, a preparation method thereof and application thereof. The ferro-chrome composite oxide has a general formula of Fe3-xCrxO4, and X-ray powder obtained through Cu-K alpha-ray measurement is diffracted at angles 2theta of 31 degrees, 36 degrees and 63 degrees and displays characteristic peak. When the ferro-chrome composite oxide serving as a catalyst performs sewage treatment, a pH value of the sewage is not required to be regulated, and the ferro-chrome composite oxide has the advantage of high sewage treatment efficiency; the ferro-chrome composite oxide is a solid catalyst and can be recycled, so that the sewage treatment cost can be reduced; and moreover, the preparation method for the ferro-chrome composite oxide is easy to operate.

Description

technical field [0001] The invention relates to a metal composite oxide, in particular to an iron-chromium composite oxide, its preparation method and application. Background technique [0002] In recent years, with the rapid development of industry, the problem of sewage pollution has become increasingly serious. Sewage contains a large amount of toxic, harmful and refractory organic substances, which pose serious hazards to human health and the ecological environment. At present, an effective method for treating sewage is to use Fenton's reagent for sewage treatment, and degrade various organic pollutants in sewage through the oxidation of Fenton's reagent, so that the treated sewage can be recycled. [0003] However, when using Fenton's reagent for sewage treatment, the pH of the sewage needs to be adjusted to 3 with sulfuric acid before the Fenton reaction, and the pH needs to be adjusted to neutral with sodium hydroxide after the reaction. Therefore, this treatment me...

Claims

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Application Information

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IPC IPC(8): B01J23/86C02F1/72
Inventor 史瑞明
Owner W STARTECH BEIJING ENVIRONMENTAL TECH
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