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Method for preparing montmorillonite in situ intercalation type nanoscale zero-valent iron

A nano-zero-valent iron and in-situ intercalation technology, applied in the interdisciplinary field of environmental science and material science, can solve problems such as easy agglomeration, poor fluidity, and ineffective oxidation

Inactive Publication Date: 2012-02-08
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So as to solve the problems of easy agglomeration, poor fluidity and easy to be "ineffectively oxidized" in the process of synthesis and application of nano-zero-valent iron

Method used

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  • Method for preparing montmorillonite in situ intercalation type nanoscale zero-valent iron
  • Method for preparing montmorillonite in situ intercalation type nanoscale zero-valent iron
  • Method for preparing montmorillonite in situ intercalation type nanoscale zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Utilizing montmorillonite clay as the template prepared by nanometer zero-valent iron, the interlayer Fe 3+The liquid phase reduction is zero-valent, and the highly active and high-stability montmorillonite-loaded (sub)nano zero-valent iron composite material is prepared. The specific operation is carried out according to the following steps:

[0030] a, pretreatment of montmorillonite: before composite material preparation, montmorillonite is carried out mineral purification, with 5g montmorillonite clay (the cation exchange capacity of montmorillonite clay is 82cmol kg -1 ) into 100ml of deionized water, stirred magnetically for 24 hours, then transferred to a 250ml polyethylene centrifuge bottle, centrifuged at 600rmp at a low speed for 6min to remove non-clay minerals, and siphoned the upper suspension into another polyethylene centrifuge bottle , to obtain particles smaller than 2μm clay particle size, add 100ml water to the precipitated particles larger than 2μm, ...

Embodiment 2

[0041] a, pretreatment of montmorillonite: before composite material preparation, montmorillonite is carried out mineral purification, with 5g montmorillonite clay (the cation exchange capacity of montmorillonite clay is 82cmol kg -1 ) into 100ml of deionized water, stirred magnetically for 24 hours and then moved into a 250ml polyethylene centrifuge bottle. The clay suspension was centrifuged at 58-60g at a low speed of 600rmp for 6 minutes to remove non-clay minerals, and the upper suspension was siphoned in In another polyethylene centrifuge bottle, get particles smaller than 2μm colloid size, add 100ml water to the precipitated particles larger than 2μm, use a vortex mixer to mix and then centrifuge at low speed to extract particles smaller than 2μm remaining in the precipitate, and suspend in the upper layer The liquid is siphoned into the centrifuge bottle of the previous suspension, and the particles larger than 2 μm are freeze-dried, stored or discarded directly, and th...

Embodiment 3

[0046] a, pretreatment of montmorillonite: before composite material preparation, montmorillonite is carried out mineral purification, with 5g montmorillonite clay (the cation exchange capacity of montmorillonite clay is 82cmol kg -1) into 100ml of deionized water, stirred magnetically for 24 hours and then moved into a 250ml polyethylene centrifuge bottle. The clay suspension was centrifuged at 58-60g at a low speed of 600rmp for 6 minutes to remove non-clay minerals, and the upper suspension was siphoned in In another polyethylene centrifuge bottle, get particles smaller than 2μm colloid size, add 100ml water to the precipitated particles larger than 2μm, use a vortex mixer to mix and then centrifuge at low speed to extract particles smaller than 2μm remaining in the precipitate, and suspend in the upper layer The liquid is siphoned into the centrifuge bottle of the previous suspension, and the particles larger than 2 μm are freeze-dried, stored or discarded directly, and the...

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Abstract

The present invention relates to a method for preparing montmorillonite in situ intercalation type nanoscale zero-valent iron. According to the method, a template is adopted, wherein the template is prepared through adopting montmorillonite clay as nanoscale zero-valent iron; the in situ intercalation method is adopted to prepare the montmorillonite-loaded nanoscale (sub-nanometer) zero-valent iro; the montmorillonite in situ intercalation type nanoscale zero-valent iron is prepared through the following preparation steps: pretreatment of montmorillonite, preparation of Fe<3+> saturated montmorillonite, acidification of Fe<3+> saturated montmorillonite and preparation of montmorillonite-loaded zero-valent iron. The nanoscale zero-valent iron in the prepared montmorillonite-loaded type zero-valent iron composite material through the method provided by the present invention is positioned between the montmorillonite layers, and exists in nanometer or sub-nanometer atom cluster scale; compared to other nanoscale zero-valent irons, the nanoscale zero-valent iron provided by the present invention has higher reaction activity and higher reducing effectiveness. According to the present invention, with the template prepared through adopting the montmorillonite as the zero-valent iron, the agglomeration of the zero-valent iron particles can be prevented, the fluidity of the zero-valent iron is enhanced, the zero-valent iron can be protected to a great degree, such that the oxidation of the zero-valent iron due to water molecules can be avoided; with the method, the problems of easy agglomeration, easy oxidation due to the water and poor fluidity during the synthesis and the application process of the nanoscale zero-valent iron are solved; an effective material and technology is provided for environmental pollution treating.

Description

technical field [0001] The invention relates to a method for preparing montmorillonite in-situ intercalation nano-zero-valent iron. The nano-zero-valent iron obtained by this method is used as an environmental functional material for removing organic and inorganic pollutants in water, which belongs to the intersection of environmental science and material science. field. Background technique [0002] The use of nano-zero-valent iron to remove pollutants in water and soil is a new pollution control technology developed in recent years. Due to its low price, easy availability, and no secondary pollution, it can efficiently remove a variety of pollutants in water, such as nitroaromatic compounds, chlorine-containing organic compounds, and heavy metal ions, which greatly promotes the use of zero-valent metal reduction technology in water treatment. The application of pollutants is considered to be a major innovation in water and soil in-situ remediation technology, and has grea...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/28C02F1/58
Inventor 贾汉忠王传义李守柱范晓芸
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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