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Soil heavy metal removal composite material and preparation method and application thereof

A technology of composite materials and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of high cost, change of soil properties, deterioration, etc., and achieve the effect of complete removal and easy degradation.

Active Publication Date: 2021-07-02
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of this technology will inevitably produce a large amount of leaching waste liquid, and the disposal of waste liquid will incur high costs; soil properties will change or even deteriorate after leaching

Method used

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  • Soil heavy metal removal composite material and preparation method and application thereof
  • Soil heavy metal removal composite material and preparation method and application thereof
  • Soil heavy metal removal composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) At room temperature, take 0.5g carboxymethyl chitosan, add 3.8g acrylic acid and 5ml deionized water, stir mechanically at 800rpm until completely dissolved.

[0043] (2) At a stirring speed of 800rpm, add 2g of sodium hydroxide to adjust the degree of neutralization of the acrylic acid monomer. After cooling, add 30μl of N,N,N',N'-tetramethyl-1,2-ethylenediamine, 0.001g of N,N'-methylenebisacrylamide, 1.5g of 500nm ferric oxide and 0.2g of potassium persulfate, nitrogen gas was introduced, and the temperature was adjusted to 80°C for polymerization reaction. After 3 hours of reaction, the product was taken out and poured into 10 Settled in cold ethanol with double vigorous stirring, filtered the precipitate, washed with deionized water and ethanol three times alternately, dried in vacuum at 60°C for 24 hours, and obtained double-network superabsorbent resin;

[0044] (3) After crushing the above-mentioned double-network superabsorbent resin and passing it through a...

Embodiment 2

[0047] (1) At room temperature, take 0.5 g of sodium alginate, add 3.8 g of acrylic acid and 5 ml of deionized water, and stir mechanically at 800 rpm until completely dissolved.

[0048](2) While stirring at 800rpm, add 2g of sodium hydroxide to adjust the degree of neutralization of the acrylic acid monomer. After cooling, add 30μl of N,N,N',N'-tetramethyl-1,2-ethylenediamine, 0.001g of N,N'-methylenebisacrylamide, 1.5g of 500nm ferric oxide and 0.2g of potassium persulfate, nitrogen gas was introduced, and the temperature was adjusted to 80°C for polymerization reaction. After 3 hours of reaction, the product was taken out and poured into 10 Settled in cold ethanol with double vigorous stirring, filtered the precipitate, washed with deionized water and ethanol three times alternately, dried in vacuum at 60°C for 24 hours, and obtained double-network superabsorbent resin;

[0049] (3) After crushing the above-mentioned double-network superabsorbent resin and passing it throu...

Embodiment 3

[0052] (1) At room temperature, take 1.0 g of carboxymethyl chitosan, add 3.8 g of acrylic acid and 5 ml of deionized water, and stir mechanically at 800 rpm until completely dissolved.

[0053] (2) While stirring at 800rpm, add 2g of sodium hydroxide to adjust the degree of neutralization of the acrylic acid monomer. After cooling, add 30μl of N,N,N',N'-tetramethyl-1,2-ethylenediamine, 0.001g of N,N'-methylenebisacrylamide, 1.5g of 500nm ferric oxide and 0.2g of potassium persulfate, nitrogen gas was introduced, and the temperature was adjusted to 80°C for polymerization reaction. After 3 hours of reaction, the product was taken out and poured into 10 Settled in cold ethanol with double vigorous stirring, filtered the precipitate, washed with deionized water and ethanol three times alternately, dried in vacuum at 60°C for 24 hours, and obtained double-network superabsorbent resin;

[0054] (3) After crushing the above-mentioned double-network superabsorbent resin and passing ...

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Abstract

The invention discloses a soil heavy metal removal composite material and a preparation method and application thereof. Firstly, carboxymethyl chitosan or sodium alginate, acrylic acid and magnetic nanoparticles are subjected to catalytic initiation polymerization to obtain a magnetic dual-network super absorbent resin material, then polylactic acid is doped, and finally the activation-adsorption integrated magnetic super absorbent resin composite material is obtained. The composite material obtained by the invention has high water absorption expansibility to endow the composite material with high adsorbability to heavy metals, organic acid is doped to activate insoluble heavy metals in soil, and the organic acid can be recycled by utilizing the magnetism of the material, so that the defects of the existing heavy metal passivator and eluting agent are overcome, and the high-hazard heavy metals in the soil can be thoroughly and efficiently removed.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution control, and in particular relates to a soil heavy metal removal composite material, a preparation method thereof and an application in treating soil heavy metal pollution. Background technique [0002] Due to the high toxicity, persistence, non-biodegradability and bioaccumulation of heavy metals, heavy metal pollution has attracted widespread attention worldwide. In recent years, various in-situ or ex-situ remediation of heavy metal-contaminated soils have been developed, such as landfill coverage, chemical fixation, soil leaching, physical and chemical adsorption, soil vitrification, electrochemical remediation, microbial or phytoremediation, etc. At present, the widely used technology is soil heavy metal fixation technology, which uses lime, phosphate, humus, biochar or various organic-inorganic composite porous materials as fixatives to adsorb and fix heavy metals, and absorb acid-so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L51/02B09C1/08C08F251/00C08F220/06C08F222/38C08K3/22C08K3/30
CPCC08L67/04C08F251/00B09C1/08C08K3/22C08K3/30C08K2201/011C08K2003/2272C08K2003/2275C08K2003/3009C08K2201/01C08K2201/005C08F220/06C08F222/385C08L51/02
Inventor 蒋刚彪刘金文胡甜刘步宁胡汉剑
Owner SOUTH CHINA AGRI UNIV
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