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A method for dispersing zero-valent iron

A zero-valent iron and dispersion technology, which is applied in the fields of environmental engineering and environmental geotechnical engineering, can solve the problems of easy aggregation, easy oxidation, and high cost of dispersants of zero-valent iron particles, and achieves low price, improved consistency, and improved dispersion effect. Effect

Active Publication Date: 2019-06-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method solves the problem that zero-valent iron particles are easy to agglomerate and oxidize to a certain extent. However, the dispersants used in the above method are expensive and are all industrial chemicals, which have potential risks to the environment.

Method used

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  • A method for dispersing zero-valent iron
  • A method for dispersing zero-valent iron
  • A method for dispersing zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 Adding different components and different ratios of dispersants, the dispersion effect test of nanometer zero-valent iron in aqueous ethanol solution.

[0058] (1) Weigh FeSO with a balance 4 ·7H 2 O 12.5g, dissolved in 100ml deoxygenated deionized water, transferred to a 500ml three-necked flask, and protected by nitrogen gas.

[0059] (2) Weigh NaBH 4 1.9g, dissolved in 100ml deoxygenated deionized water.

[0060](3) Under the conditions of mechanical stirring (r=200r / min) and nitrogen protection, the solution in step (2) was added dropwise to the solution in step (1) at a rate of 2 drops / min.

[0061] (4)BH 4 - Continue to react for 30 minutes after the solution is dripped, wash with deionized water and absolute ethanol for 2 to 3 times respectively, and separate zero-valent iron particles by magnetic separation, and store them in 50ml of ethanol aqueous solution, wherein the volume ratio of ethanol and water is 1:4, the mass fraction of elemental ir...

Embodiment 2

[0066] Example 2 Adding different components and different ratios of dispersants, the dispersion effect test of micron zero-valent iron in the mixed system of bentonite and water.

[0067] (1) Weigh 4.0g of commercial micron iron powder (Daramend iron powder) into a 50ml centrifuge tube, add deoxygenated deionized water to the 50ml mark.

[0068] (2) Weigh 20.0 g of bentonite and add it to the centrifuge tube of step (1).

[0069] (3) Steps 1 to 2 were repeated six times to obtain micron zero-valent iron-bentonite water systems numbered A, B, C, D, E, and F.

[0070] (4) Add 2.0g of alkyl glycosides + 20g of deionized water, 1.0g of xanthan gum + 1.0g of alkyl glycosides + 20g of deionized water, 1.0g of guar beans to B, C, D, E, and F respectively. Gum + 1.0g alkyl glucoside + 20g deionized water, 1.0g guar gum + 0.6g xanthan gum + 0.4g alkyl glycoside + 20g deionized water, 1.2g guar gum + 0.4g xanthan gum + 0.4g alkyl glycoside + 20g deionized water, add 20g deionized wat...

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Abstract

The invention discloses a method for dispersing zero-valent iron, and belongs to the technical fields of environmental engineering and environmental geotechnical engineering. The dispersant is prepared by mixing alkyl glucoside, guar gum and xanthan gum according to a certain ratio, and has a good dispersion effect on both nanometer zero-valent iron and micrometer zero-valent iron. The dispersion-modified nanometer zero-valent iron can be applied to the remediation of polluted groundwater, and the dispersed-modified micron zero-valent iron can be applied to the remediation of polluted soil.

Description

technical field [0001] The invention belongs to environmental engineering and environmental geotechnical engineering, and specifically relates to a method for dispersing zero-valent iron, which can effectively improve the migration and dispersion performance of zero-valent iron in groundwater and soil, and is suitable for pollution by heavy metals and chlorinated organic substances In-situ remediation of groundwater and soil. technical background [0002] Zero-valent iron is simple iron, which can be divided into nano-scale zero-valent iron (0-200nm) and micron-scale zero-valent iron (1-2um). It has strong reactivity and is widely used in groundwater polluted by heavy metals and chlorinated organic substances. and soil restoration. However, in engineering applications, because 1. The surface of zero-valent iron particles has accumulated a large amount of positive and negative charges; 2. The specific surface area of ​​zero-valent iron particles is large, the surface energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00
CPCB22F1/147B22F1/145
Inventor 杜延军周实际夏威夷张黎明
Owner SOUTHEAST UNIV