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Magnetic carboxylation hollow microsphere soil restoration agent as well as preparation method and application thereof

A technology of soil remediation agent and hollow microspheres, which is applied in the direction of chemical instruments and methods, restoration and application of contaminated soil, etc., can solve problems such as weak salt-alkali resistance, long repair time, and low specificity, and achieve Shorten the curing time, reduce the amount of dosage, and have strong specificity

Active Publication Date: 2018-08-28
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a magnetic carboxylated hollow microsphere soil remediation agent, which solves the problems of poor specificity, large dosage and long repair time in traditional remediation agents in soil heavy metal stabilization and remediation. Most of the chemicals in the environment are concentrated in the field of water treatment, and they are rarely used in soil, and most of them are not specific, have weak salt-alkali resistance, and cannot be recycled.

Method used

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  • Magnetic carboxylation hollow microsphere soil restoration agent as well as preparation method and application thereof
  • Magnetic carboxylation hollow microsphere soil restoration agent as well as preparation method and application thereof
  • Magnetic carboxylation hollow microsphere soil restoration agent as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0049] A preparation method of magnetic carboxylated hollow microsphere soil repair agent, comprising the following steps:

[0050] Step 1, using the improved monodisperse SiO 2 Microspheres

[0051] Step 1.1, mix 6ml of concentrated ammonia water, 49.5ml of absolute ethanol and 18ml of deionized water, then magnetically stir at 35°C for 20min, and obtain solution A after stirring;

[0052] Step 1.2, mix 3ml tetraethyl orthosilicate with 49.5ml absolute ethanol, then magnetically stir at 35°C for 20min, and obtain solution B after stirring;

[0053] Step 1.3, quickly pour solution B into solution A, and then react at 35°C. After 35 minutes of reaction, a milky white precipitate begins to appear. Continue to react for 5 minutes, and the milky white precipitate is separated to obtain monodisperse SiO 2 Microspheres;

[0054] Step 2, hydrothermal synthesis of Fe 3 o 4 @C hollow microsphere

[0055] Step 2.1, 0.0506g of SiO prepared in step 1 2 Put in a beaker, pour 60ml ...

Embodiment 2

[0067] Taking the farmland soil near the metal smelter polluted by heavy metal lead as the soil sample, adjust the organic matter content in the lead-contaminated soil to be restored to 63.04g kg -1 , pH is 7.33, conductivity is 142.60μs·cm -1 , The moisture content is 50%.

[0068] It should be noted that when adjusting the content of organic matter in the soil to be restored, when the content of organic matter in the polluted soil is detected to be too low, organic matter such as dry animal manure with a particle size of 1-2 mm or composted crop straw and other organic matter can be added to increase the soil organic matter; When the content of soil organic matter is too high, spray a certain concentration of potassium permanganate solution on the polluted soil to oxidize and decompose the soil organic matter; the organic matter plays an auxiliary role in the curing process, mainly promoting the adsorption and complexation of heavy metals by the restoration agent.

[0069] ...

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Abstract

The invention discloses a magnetic carboxylation hollow microsphere soil restoration agent and a preparation method thereof. The method comprises the following steps of using improved Stober method for preparing single dispersion SiO2 microspheres; using a hydrothermal method for synthesizing Fe3O4@C hollow microspheres; using a dialysis method for synthesizing Fe3O4@C-COOH hollow microspheres. The invention also provides application of the magnetic carboxylation hollow microsphere soil restoration agent to lead pollution soil restoration. The improved Stober method, the hydrothermal method and the dialysis method are integrated; the synthesized carboxylation hollow microspheres have the unique core-sell structures; a great number of -COOH and -OH groups are coated on the surface; the advantages of great adsorption volume, high specificity and the like are realized; the adsorption volume on heavy metal lead in the soil is much higher than the adsorption volume of synthesis materials prepared a coprecipitation method, a micro emulsion method and a thermolysis method. The carboxylation hollow microsphere soil restoration agent prepared by the method also has a certain recovery performance and can be reused.

Description

technical field [0001] The invention belongs to the technical field of heavy metal polluted soil treatment, in particular to a magnetic carboxylated hollow microsphere soil repair agent, its preparation method and application. Background technique [0002] Economic development has brought a series of environmental problems, especially soil environmental pollution. According to the survey, the total rate of over-standard soil points in the country is 16.1%, and the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1% respectively. The point exceeding standard rate is 1.5%, which poses a great threat to human life and health. [0003] The technologies for remediation of heavy metal pollution in soil mainly include physical remediation, chemical remediation and biological remediation. Physical restoration mainly includes foreign soil, soil replacement method, electric restoration, thermal desorption, etc. Excavated soil and s...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/00B09C1/08B01J20/22B01J20/06B01J20/28B01J20/30H01F1/01H01F41/00
CPCB01J20/06B01J20/22B01J20/28009B01J20/28021B09C1/00B09C1/08C09K17/40H01F1/0054H01F1/01H01F41/00
Inventor 马闯刘楠魏明宝张宏忠赵继红杜京京贾昌昌刘福勇扈斌
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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