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Application of mesoporous alumina loaded magnetic ferroferric oxide nano material to catalytic ozonation

A mesoporous alumina and catalyst technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, oxidized water/sewage treatment, etc., can solve solid-liquid separation, serious metal dissolution, Poor effect and other problems

Inactive Publication Date: 2013-05-15
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalysts generally have a good catalytic effect under acidic conditions, but the phenomenon of metal dissolution is serious, and the effect is often not good under neutral conditions.
In addition, most of the above-mentioned catalysts are powders, and there is a problem of solid-liquid separation in actual operation, and it is difficult to recycle the catalysts.

Method used

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  • Application of mesoporous alumina loaded magnetic ferroferric oxide nano material to catalytic ozonation

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0011] Specific implementation mode one: Fe 3 o 4 / Al 2 o 3 Catalyst preparation

[0012] A certain amount of Fe(NO 3 ) 3 9H 2 O was dissolved in a small amount of deionized water, a certain amount of mesoporous alumina carrier was added to it, impregnated for 2 hours, then dried at 100°C, and calcined at 400-500°C for 3-6 hours in an air atmosphere to obtain Fe 2 o 3 / Al 2 o 3 . Fe 2 o 3 / Al 2 o 3 in H 2 Reduction at 250-350°C for 2-4 hours under atmosphere to obtain Fe 3 o 4 / Al 2 o 3 , where Fe 3 o 4 The mass content is 10-50wt%.

specific Embodiment approach 2

[0013] Specific implementation mode two: Fe 3 o 4 / Al 2 o 3 Catalytic ozonation activity of the catalyst

[0014] In a 1L columnar bubbling semi-continuous reactor, 2,4-dichlorophenoxyacetic acid was used as the target pollutant to evaluate Fe according to the present invention 3 o 4 / Al 2 o 3 catalytic ozonation activity. The reaction temperature is 25°C, pH=6, the gas flow rate of the ozone-oxygen mixed gas is 0.2L / min, the ozone concentration in the gas is 30mg / L, and the catalyst dosage is 1g / L.

[0015] figure 1 When pH=6,2,4-dichlorophenoxyacetic acid initial concentration is 20mg / L, Fe 3 o 4 / Al 2 o 3 Removal of TOC by 2,4-dichlorophenoxyacetic acid as a function of time. As can be seen from the figure, when pH=6, the removal effect of single ozone oxidation on 2,4-dichlorophenoxyacetic acid is not obvious (the removal rate of TOC in 20 minutes is 32%), adding Fe 3 o 4 20 minutes after the catalyst, the TOC removal rate reached 60%, while the addition of ...

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Abstract

A preparation method of a mesoporous alumina loaded magnetic ferroferric oxide nano material for heterogeneous catalytic ozonation. The method comprises steps of: dissolving a certain amount of Fe (NO3)3.9H2O in a small amount of deionized water; adding a certain amount of a mesoporous alumina carrier into the solution; soaking for 2 h; then drying at 100 DEG C; calcining in air at 400-500 DEG C for 3-6 h to obtain Fe2O3 / Al2O3; and reducing the obtained Fe2O3 / Al2O3 in a H2 atmosphere at 250-350 DEG C for 2-4 h to obtain Fe3O4 / Al2O3, wherein content of Fe3O4 is 10-5 0wt%. Compared with single ozonation, the catalyst shows high ozone catalytic activity and has good stability.

Description

technical field [0001] The invention relates to a method for developing a magnetic catalyst for heterogeneous catalytic ozonation, in particular to a method for preparing a mesoporous alumina-supported magnetic ferroferric oxide catalyst and research on its catalytic ozonation. Background technique [0002] Ozone has been widely used in the field of water treatment in recent years due to its strong oxidizing and disinfection capabilities. But the solubility of ozone in water is low and easy to decompose, the utilization efficiency is low, and the operating cost is high, which limits its development to a certain extent. Although ozone can oxidize many refractory organic substances in water, the reaction selectivity with organic substances is poor, and it is not easy to completely decompose organic substances into CO 2 and H 2 O, its products are often small molecular carboxylic acid organic compounds that are difficult to mineralize, and the toxicity of intermediate product...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/78
Inventor 胡春吕爱花
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI