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Thermal desorption circulating medium for soil polluted by organic matters, and preparation method and application thereof

A technology for circulating medium and polluted soil, applied in the field of environmental protection catalytic materials and soil remediation, to achieve the effect of strong application and promotion value, efficient removal and reduction of industrial thermal desorption costs

Active Publication Date: 2022-02-01
NANJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to aim at the present situation and existing problems of existing soil thermal desorption, and propose a kind of catalyst-loaded organic matter polluted soil thermal desorption circulation medium, another purpose of the present invention is to provide the preparation method of above-mentioned circulation medium

Method used

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  • Thermal desorption circulating medium for soil polluted by organic matters, and preparation method and application thereof
  • Thermal desorption circulating medium for soil polluted by organic matters, and preparation method and application thereof
  • Thermal desorption circulating medium for soil polluted by organic matters, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of active component precursor solution

[0050] Weigh 30.215g cobalt nitrate hexahydrate, 1.649g calcium chloride hexahydrate, 1.789g potassium nitrate, add 242.055g deionized water and stir at room temperature for 30min to obtain the active component precursor solution, wherein the active component tricobalt tetroxide, oxidized The mass ratio of calcium and potassium oxide is 1:0.1:0.1;

[0051] (2) Preparation of catalyst

[0052]Taking the carrier quality as a benchmark, according to the active component accounting for 10% of the carrier mass, take by weighing 313.381g iron nitrate hexahydrate, 15.000g citric acid and the active component precursor ion solution that step (1) makes and transfer to 500ml polytetrafluoroethylene In the vinyl fluoride hydrothermal reaction kettle, react at 160°C for 4 hours, take it out and cool it, filter and take out the precipitate, put it in a blast drying oven at 80°C and dry it for 12 hours to obtain the catalyst r...

Embodiment 2

[0060] (1) Preparation of active component precursor solution

[0061] Weigh 24.825g cobalt acetate tetrahydrate, 12.567g calcium acetate monohydrate, 7.400g potassium sulfate, add 360.023g deionized water and stir at room temperature for 30min to obtain the active component precursor solution, wherein the active components tricobalt tetroxide, calcium oxide , The mass ratio of potassium oxide is 1:0.5:0.5;

[0062] (2) Preparation of catalyst

[0063] Take carrier quality as benchmark, account for 8% of carrier quality according to active component and take by weighing 700.462g ferric chloride hexahydrate, 20.000g citric acid and the active component precursor ion solution that step (1) makes successively transfer to 500ml In a polytetrafluoroethylene hydrothermal reaction kettle, react at 100°C for 12 hours, take out and cool, filter and take out the precipitate and place it in a blast drying oven at 120°C for 6 hours to obtain the catalyst required for circulating medium s...

Embodiment 3

[0071] (1) Preparation of active component precursor solution

[0072] Weigh 28.022g cobalt sulfate heptahydrate, 6.284g calcium acetate monohydrate, 4.293g potassium nitrate, add 416.409g deionized water and stir at room temperature for 30min to obtain the active component precursor solution, wherein the active components tricobalt tetroxide, calcium oxide , The mass ratio of potassium oxide is 1:0.25:0.25;

[0073] (2) Preparation of catalyst

[0074] Take carrier quality as benchmark, account for 6% of carrier quality according to active component and take by weighing 626.762g ferric nitrate hexahydrate, 10.000g citric acid and the active component precursor ion solution that step (1) makes successively transfer to 500ml polytetrafluoroethylene In the vinyl fluoride hydrothermal reaction kettle, react at 120°C for 8 hours, take it out and cool it, filter and take out the precipitate, put it in a blast drying oven at 100°C and dry it for 8 hours to obtain the catalyst requi...

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Abstract

The invention discloses a catalyst-loaded organic matter contaminated soil thermal desorption circulating medium and a preparation method thereof. Microporous ceramic is used as a circulating body, and 5-20% of a Co-Ca-K@Fe3O4 catalyst is loaded. The calcium-potassium-cobalt composite oxide is a catalytic active component, the citric acid is a carrier complexing agent, the nano ferroferric oxide particles are carriers, and the lauryl sodium sulfate is a circulating medium dispersing agent. On the basis of the mass of the carrier, the mass percentage of the catalytic active component is 5-15%. The preparation method comprises the following steps: adding ferric salt, citric acid and an active component precursor solution into a polytetrafluoroethylene hydrothermal reaction kettle, and carrying out hydrothermal treatment, drying and roasting to obtain the Co-Ca-K@Fe3O4 catalyst. The circulating medium can synchronously catalyze and oxidize organic pollutants in the soil thermal desorption process, decompose the organic pollutants into water, carbon dioxide and the like and release heat, and can be recycled in the thermal desorption process; after being used for a period of time, the thermal medium can be abraded and broken, and the catalytic material also loses activity and is decomposed into beneficial components such as calcium oxide and potassium salt which have an improvement effect on soil.

Description

technical field [0001] The invention relates to a catalyst-loaded organic matter-contaminated soil thermal desorption circulation medium and a preparation method and application thereof, which belong to the field of environmental protection catalytic materials and soil remediation. Background technique [0002] Research on various remediation technologies and equipment for organically polluted sites has been widely carried out in recent years, and relevant research results have also been applied to the remediation of contaminated sites. Thermal desorption remediation technology is widely used in the treatment of soil, sludge, sediment and other sites containing volatile and semi-volatile organic pollutants due to its advantages of high treatment efficiency, short remediation period, and wide application range. Pollutants that can be treated by thermal desorption include nitrobenzene, polybrominated diphenyl ethers, chlorobenzene, mercury, polychlorinated biphenyls, and polyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B09C1/06B09C1/08C05G3/00C05G3/80B01J23/78B01J35/10
CPCB01D53/86B09C1/06B09C1/08B01J23/78C05G3/00C05G3/80C05D1/00B01J35/60C05D3/00C05D9/02
Inventor 徐海涛徐慕涛金奇杰陈纪赛周永贤李明波支晓欢
Owner NANJING UNIV OF TECH
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