Preparation method for magnetic adsorption material for adsorbing heavy metals and application of magnetic adsorption material

A technology for magnetic adsorption material and heavy metal adsorption, applied in the field of soil pollution and remediation, can solve the problems of poor treatment effect of various heavy metals, non-reusable, and high restoration cost, and achieves the ability to enhance the ability to extract heavy metals and promote the coordination effect. ability, the effect of improving water solubility

Pending Publication Date: 2018-10-12
JIANGSU GUOCHUANG ENVIRO PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main disadvantages of existing soil heavy metal adsorbents: 1. The treatment effect on various heavy metals is not outstanding
2. It is easy to cause secondary pollution when the soil conditions change
3. The repair cost is high and cannot be reused

Method used

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  • Preparation method for magnetic adsorption material for adsorbing heavy metals and application of magnetic adsorption material
  • Preparation method for magnetic adsorption material for adsorbing heavy metals and application of magnetic adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 10g of carboxymethyl chitosan in 200ml of water to form an aqueous solution, then add 10g of activated carbon powder, 10g of oleic acid-wrapped magnetic ferric iron tetroxide nanoparticles and 5g of glutaraldehyde crosslinking agent to the aqueous solution, stir well and then add Sodium hydroxide solution, adjust the pH value to 12, place the reaction system in constant temperature water at 60°C for constant temperature crosslinking reaction for 7 hours, then add ethanol aqueous solution to the reaction product, separate solid and liquid, and wash the product with water and absolute ethanol five times After drying, grinding and sieving, the magnetic adsorption material can be obtained.

[0030] We carried out FT-IR test on the obtained magnetic adsorption material, the results are as follows: figure 1 shown, from figure 1 It can be seen that 1600cm -1 The characteristic peak is C=O bond, 1070cm -1 The absorption peak at CH is 2 The characteristic absorption...

Embodiment 2

[0033] Dissolve 10g carboxymethyl chitosan in 200ml water to form an aqueous solution, then add 50g activated carbon powder, 30g oleic acid-wrapped magnetic iron ferric oxide nanoparticles and 25g glyoxal cross-linking agent to the aqueous solution, stir well and add Sodium hydroxide solution, adjust the pH value to 10, place the reaction system in constant temperature water at 90°C for constant temperature crosslinking reaction for 12 hours, then add ethanol aqueous solution to the reaction product, separate solid and liquid, and wash the product five times with water and absolute ethanol After drying, grinding and sieving, the magnetic adsorption material can be obtained.

[0034] In order to verify the technical effect of the magnetic adsorption material obtained in Example 2, we applied the material obtained in Example 2 to heavy metal-contaminated soil, and added 0.1 kg of magnetic adsorption material to 1 kg of wet weight soil, mixed thoroughly, and the adsorption time wa...

Embodiment 3

[0036] Dissolve 10g of carboxymethyl chitosan in 200ml of water to form an aqueous solution, then add 30g of activated carbon powder, 50g of oleic acid-wrapped magnetic ferric iron tetroxide nanoparticles and 30g of epichlorohydrin crosslinking agent to the aqueous solution, and stir thoroughly Add sodium hydroxide solution, adjust the pH value to 9, place the reaction system in constant temperature water at 80°C for constant temperature crosslinking reaction for 5 hours, then add ethanol aqueous solution to the reaction product, separate solid and liquid, and wash the product with water and absolute ethanol for five After drying for a few times, the magnetic adsorption material can be obtained by grinding and sieving.

[0037] In order to verify the technical effect of the magnetic adsorption material obtained in Example 3, we applied the material obtained in Example 3 to heavy metal-contaminated soil, and added 0.01 kg of magnetic adsorption material to 1 kg of wet weight soi...

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Abstract

The invention relates to a preparation method for a magnetic adsorption material for adsorbing heavy metals. The method comprises the following steps: dissolving carboxymethyl chitosan in water to prepare a solution, then, adding activated carbon powder, oleic acid wrapped magnetic Fe3O4 nanoparticles and a cross-linker into the solution so as to obtain a reaction system, uniformly stirring the reaction system, and then, adjusting the pH of the reaction system to 9 to 12, wherein the mass ratio of the carboxymethyl chitosan to the activated carbon powder to the oleic acid wrapped magnetic Fe3O4 nanoparticles is 1: (1 to 5): (1 to 5); and then, subjecting the reaction system to an isothermal reaction for 5 to 12 hours at the temperature of 60 DEG C to 90 DEG C, carrying out solid-liquid separation after the reaction is complete, and subjecting the product to washing, drying, grinding and sieving, thereby obtaining the magnetic adsorption material. According to the magnetic material disclosed by the invention, the structure is stable, the specific surface area is greater than 200m<2>/g, the magnetic material can be rapidly separated under the condition of an external magnetic field without generating secondary pollution; and the material can be recycled repeatedly, so that the soil restoration cost is reduced.

Description

technical field [0001] The invention relates to a preparation method and application of an adsorption material, in particular to a preparation method and application of a magnetic adsorption material for absorbing heavy metals, and belongs to the technical field of soil pollution and restoration. Background technique [0002] Cultivated land is the basic resource and condition for human survival. The second national land survey shows that my country's cultivated land area is 13538×104hm 2 (2.031 billion mu). The Ministry of Environmental Protection’s 2014 National Soil Pollution Survey Bulletin shows that my country’s farmland soil pollution is becoming more and more serious, and the rate of farmland soil points exceeding the standard reaches 19.4%, and cadmium, nickel, copper, arsenic, mercury, lead, DDT and polycyclic aromatic hydrocarbons have become the main pollutants. thing. Soil pollutants are difficult to diffuse and dilute. Once pollution occurs, it is difficult t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B09C1/08
CPCB01J20/06B01J20/20B01J20/24B01J20/28009B09C1/08
Inventor 焦伟姚志建王伟莉李文涛仰凡甘萍
Owner JIANGSU GUOCHUANG ENVIRO PROTECTION TECH CO LTD
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