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A kind of organic matter polluted soil thermal desorption circulating medium and its preparation method and application

A technology of circulating medium and circulating body, applied in the direction of restoration, application, and separation methods of polluted soil, to achieve strong application and promotion value, high cost performance, and efficient removal and reduction effects

Active Publication Date: 2022-07-15
NANJING TECH UNIV +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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  • A kind of organic matter polluted soil thermal desorption circulating medium and its preparation method and application
  • A kind of organic matter polluted soil thermal desorption circulating medium and its preparation method and application
  • A kind of organic matter polluted soil thermal desorption circulating medium and its preparation method and application

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Experimental program
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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 an active component precursor solution, wherein the active components tricobalt tetroxide, oxidized The mass ratio of calcium and potassium oxide is 1:0.1:0.1;

[0051] (2) Preparation of catalyst

[0052]Based on the mass of the carrier, according to the fact that the active components account for 10% of the mass of the carrier, 313.381g of ferric nitrate hexahydrate, 15.000g of citric acid and the active component precursor ion solution obtained in step (1) were weighed and transferred to 500ml of polytetrafluoroethylene. In the hydrothermal reaction kettle of vinyl fluoride, react at 160°C for 4h and then take it out to cool, filter out the precipitate and place it in a blast drying oven at 80°C for 12h to obtain the cataly...

Embodiment 2

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

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

[0062] (2) Preparation of catalyst

[0063] Based on the mass of the carrier, 700.462g of ferric trichloride hexahydrate, 20.000g of citric acid and the active component precursor ion solution obtained in step (1) were weighed and transferred to 500ml according to the active component accounting for 8% of the mass of the carrier. In a polytetrafluoroethylene hydrothermal reaction kettle, react at 100 °C for 12 h, take it out for cooling, filter out the precipitate, and place it in a blast drying oven at 120 °C for 6 h to obtain the catalyst required for t...

Embodiment 3

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

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

[0073] (2) Preparation of catalyst

[0074] Based on the mass of the carrier, according to the fact that the active component accounts for 6% of the mass of the carrier, 626.762g of ferric nitrate hexahydrate, 10.000g of citric acid and the active component precursor ion solution obtained in step (1) were weighed and transferred to 500ml of polytetrafluoroethylene. In the hydrothermal reaction kettle of vinyl fluoride, react at 120°C for 8h and then take it out to cool, filter out the precipitate and place it in a blast drying oven at 100°C for 8h to obt...

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Abstract

The invention discloses a catalyst-loaded organic-contaminated soil thermal desorption circulating medium and a preparation method thereof. Microporous ceramics are used as a circulating body, and 5-20% of Co-Ca-K@Fe is loaded. 3 O 4 catalyst. The calcium potassium cobalt composite oxide is the catalytic active component, the citric acid is the carrier complexing agent, the nano ferric oxide particles are the carrier, and the sodium lauryl sulfate is the circulating medium dispersant. Based on the quality of the carrier, the mass percentage of the catalytically active components is 5% to 15%. The iron salt, citric acid and active component precursor solution were added into the polytetrafluoroethylene hydrothermal reactor, and Co‑Ca‑K@Fe was prepared by hydrothermal, drying and roasting 3 O 4 catalyst. The circulating medium can simultaneously catalyze and oxidize organic pollutants in the process of soil thermal desorption, decompose them into water, carbon dioxide, etc., and release heat, and can be recycled during the thermal desorption process; after a period of use, the thermal medium will It is worn and broken, and the catalytic material also loses its activity and decomposes into calcium oxide, potassium salt and other beneficial components that can improve the soil.

Description

technical field [0001] The invention relates to a catalyst-loaded organic-contaminated soil thermal desorption circulating medium, a preparation method and application thereof, and belongs to the fields of environmental protection catalytic materials and soil remediation. Background technique [0002] Research on various remediation technologies and equipment for organically polluted sites has been carried out extensively 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 high treatment efficiency, short remediation period and wide application range. The pollutants that can be treated by thermal desorption include nitrobenzene, polybrominated diphenyl ethers, chlorobenzene, mercury, polychlorinated biphenyls and polycyclic aromatic hy...

Claims

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Application Information

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Patent Type & Authority Patents(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 TECH UNIV
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