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Iron-based nano material for in-situ remediation of heavy metal polluted underground water as well as preparation method and application of iron-based nano material

A nano-material and in-situ repair technology, applied in the direction of contaminated groundwater/leachate treatment, water pollutants, water/sewage treatment, etc., can solve problems such as agglomeration and magnetic weakening, and easy oxidation of nano-zero-valent iron, to achieve Improve the use of activity, reduce oxidation failure, improve the effect of activity

Pending Publication Date: 2022-07-29
湖南飞润新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide an iron-based nanomaterial for in-situ repair of heavy metal-contaminated groundwater and its preparation method and application. The iron-based nanomaterial provided by the present invention solves the problems of easy oxidation, agglomeration and The problem of weakened magnetism

Method used

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preparation example Construction

[0026] The present invention also provides the preparation method of the iron-based nanomaterial according to the above technical solution, comprising the following steps:

[0027] 1) dissolving the antioxidant in water to obtain an antioxidant solution;

[0028] 2) dispersing the nano-zero valent iron to obtain a nano-zero-valent iron suspension; dispersing the nano-ferric oxide to obtain a nano-iron tetroxide suspension; suspending the nano-zero ferric oxide liquid, nano ferric oxide suspension and the antioxidant solution obtained in step 1) are mixed to obtain a mixed solution;

[0029] 3) the mixed suspension obtained in the step 2) is mixed with activated carbon, and the solid-liquid is separated, and the obtained solid is an iron-based nanomaterial;

[0030] The mass ratio of the nanometer zero-valent iron, the nanometer ferric oxide, the antioxidant and the activated carbon is 10:1.5-2.5:3-7:3-7.

[0031] In the present invention, the mass ratio of the nanometer zero...

Embodiment 1

[0039] Preparation steps of iron-based nanomaterials for in-situ remediation of heavy metal-contaminated groundwater:

[0040] (1) First prepare water at 50°C, add carboxymethyl cellulose according to the mass ratio of water to carboxymethyl cellulose of 3:1, and keep stirring at a stirring speed of 200 rpm until the carboxymethyl cellulose is completely dissolved. to obtain a carboxymethyl cellulose solution;

[0041] (2) Disperse the nano zero-valent iron powder and nano-ferric tetroxide powder respectively, and then add the dispersed nano-zero-valent iron suspension and nano-ferric tetroxide suspension to the carboxymethyl cellulose solution respectively And stir and mix, stirring speed is 200rpm, obtain mixed suspension;

[0042] (3) then, in the mixed suspension, add activated carbon, and fully stir, and the stirring speed is 200rpm;

[0043] Nano zero valent iron powder, nano ferric oxide powder, carboxymethyl cellulose and activated carbon are carried out in a mass ra...

Embodiment 2

[0046] Preparation steps of iron-based nanomaterials for in-situ remediation of heavy metal-contaminated groundwater:

[0047] (1) First prepare water at 50°C, add carboxymethyl cellulose at a mass ratio of water to carboxymethyl cellulose of 8:1, and keep stirring at a stirring speed of 200 rpm until the carboxymethyl cellulose is completely dissolved to obtain Carboxymethyl cellulose solution;

[0048] (2) Disperse the nano zero-valent iron powder and nano-ferric tetroxide powder respectively, and then add the dispersed nano-zero-valent iron suspension and nano-ferric tetroxide suspension to the carboxymethyl cellulose solution respectively And stir and mix, stirring speed is 200rpm, obtain mixed suspension;

[0049] (3) then, in the mixed suspension, add activated carbon, and fully stir, and the stirring speed is 200rpm;

[0050] Nano zero valent iron powder, nano ferric oxide powder, carboxymethyl cellulose and activated carbon are carried out in a mass ratio of 10:2:5:5; ...

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Abstract

The invention provides an iron-based nano material for in-situ remediation of heavy metal polluted underground water as well as a preparation method and application of the iron-based nano material, and belongs to the technical field of underground water pollution treatment. The iron-based nano material is prepared from nano zero-valent iron, nano ferroferric oxide, an antioxidant and activated carbon, and the mass ratio of the nano zero-valent iron to the nano ferroferric oxide to the antioxidant to the activated carbon is 10: (1.5-2.5): (3-7): (3-7). By adopting the iron-based nano material provided by the invention, the problems that the nano zero-valent iron is easy to oxidize and agglomerate and the magnetism is weakened are solved.

Description

technical field [0001] The invention belongs to the technical field of groundwater pollution control, and in particular relates to an iron-based nanomaterial for in-situ repair of heavy metal-contaminated groundwater and a preparation method and application thereof. Background technique [0002] The main difficulties in the remediation of heavy metal-contaminated groundwater: (1) The water flow is large, and it is difficult to meet the requirements by using the common ex-situ treatment method of wastewater; (2) Compared with ordinary sewage, the heavy metal content in groundwater is low, generally at 1mg / within L. The use of common methods is large and the cost is high. (3) Most of the groundwater flows in complicated directions, and it is difficult to effectively treat it with traditional in-situ remediation methods, and the treated waste residue is difficult to recover. And leaving the ground will cause heavy metal pollution to continue and repeat. [0003] The advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/28C02F1/461C02F1/48C02F101/20C02F103/06
CPCC02F1/46176C02F1/288C02F1/705C02F1/488C02F2103/06C02F2101/20
Inventor 张波肖璟樊家其沈伟利王大萍朱博洪朱子为
Owner 湖南飞润新材料有限公司
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