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Dispersing method for zero-valent iron

A zero-valent iron, dispersion technology, applied in the field of environmental engineering and environmental geotechnical engineering, can solve the problems of high cost of dispersants, easy oxidation, easy aggregation of zero-valent iron particles, etc., to achieve low price, increase consistency, and reduce usage volume effect

Active Publication Date: 2017-11-17
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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  • Dispersing method for zero-valent iron
  • Dispersing method for 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 dispersing method for zero-valent iron, and belongs to the technical field of environmental engineering and environmental geotechnics. A dispersing agent is formed by mixing alkyl glycoside, guar gum and xanthan gum according to a certain proportion, and a good dispersing effect is shown for nano zero-valent iron and micron zero-valent iron. The dispersed and modified nano zero-valent iron can be applied to restoration of polluted underground water, and the dispersed and modified micron zero-valent iron can be applied to restoration 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 Applications(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
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