Montmorillonite composite material and application thereof in adsorbing heavy metals

The technology of composite material and montmorillonite is applied in the application field of montmorillonite composite material and its adsorption of heavy metals, which can solve the problems such as the adsorption efficiency of polluted heavy metals, and achieve the advantages of adsorption, low energy consumption, and orderly distribution of pore structures. Effect

Pending Publication Date: 2021-12-17
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems that the modified montmorillonite causes potential pollution to the environment and the low adsorption efficiency of the montmorillonite to heavy metals in the prior art, one of the purposes of the present invention is to provide a montmorillonite composite material; one of the purposes of the present invention The second is to provide the preparation method of the montmorillonite composite material; the third object of the present invention is to provide the application of the montmorillonite composite material in the adsorption of heavy metals

Method used

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  • Montmorillonite composite material and application thereof in adsorbing heavy metals
  • Montmorillonite composite material and application thereof in adsorbing heavy metals
  • Montmorillonite composite material and application thereof in adsorbing heavy metals

Examples

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Effect test

Embodiment 1

[0055] The method that present embodiment prepares montmorillonite composite material may further comprise the steps:

[0056] (1) Add 1.40g montmorillonite to 250mL FeCl with a concentration of 0.2mol / L 3 solution, fully stirred, the initial Fe / montmorillonite mass ratio of the resulting mixed solution is 1:0.5;

[0057] (2) Add 300 mL of NaOH solution with a concentration of 1 mol / L dropwise to the mixed solution obtained in step (1) at a rate of 0.5 mL / min, and continue stirring until pH=7.0 to obtain a precursor suspension of the composite material;

[0058] (3) aging the precursor suspension obtained in step (2) at room temperature for 4 hours, and re-adjusting the pH to 7.0 with the NaOH solution in step (2);

[0059] (4) The suspension in step (3) is centrifuged to obtain a montmorillonite composite material, which is freeze-dried and stored.

[0060] According to the Brunauer-Emmett-Teller (BET) method, the specific surface area of ​​the montmorillonite composite mat...

Embodiment 2

[0063] The method that present embodiment prepares montmorillonite composite material may further comprise the steps:

[0064] (1) Add 1.87g montmorillonite to 250mL FeCl with a concentration of 0.2mol / L 3 solution, fully stirred, the initial Fe / montmorillonite mass ratio of the resulting mixed solution is 1.5:1;

[0065] (2) Add 300 mL of NaOH solution with a concentration of 1 mol / L dropwise to the mixed solution obtained in step (1) at a rate of 0.5 mL / min, and continue stirring until pH=7.0 to obtain a precursor suspension of the composite material;

[0066] (3) aging the precursor suspension obtained in step (2) at room temperature for 4 hours, and re-adjusting the pH to 7.0 with the NaOH solution in step (2);

[0067] (4) The suspension in step (3) is centrifuged to obtain a montmorillonite composite material, which is freeze-dried and stored.

[0068] According to the BET method, the specific surface area of ​​the prepared montmorillonite composite material in the pre...

Embodiment 3

[0071] The method that present embodiment prepares montmorillonite composite material may further comprise the steps:

[0072] (1) Add 2.8g montmorillonite to 250mL FeCl with a concentration of 0.2mol / L 3 solution, fully stirred, the initial Fe / montmorillonite mass ratio of the resulting mixed solution is 1:1;

[0073] (2) Add 300 mL of NaOH solution with a concentration of 1 mol / L dropwise to the mixed solution obtained in step (1) at a rate of 0.5 mL / min, and continue stirring until pH=7.0 to obtain a precursor suspension of the composite material;

[0074] (3) aging the precursor suspension obtained in step (2) at room temperature for 4 hours, and re-adjusting the pH to 7.0 with the NaOH solution in step (2);

[0075] (4) The suspension in step (3) is centrifuged to obtain a montmorillonite composite material, which is freeze-dried and stored.

[0076] According to the BET method, the specific surface area of ​​the prepared montmorillonite composite material in this embod...

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Abstract

The invention discloses a montmorillonite composite material and application thereof in adsorbing heavy metals. The montmorillonite composite material comprises montmorillonite and ferrihydrite, wherein the ferrihydrite is dispersed on the outer surface of the montmorillonite. The montmorillonite composite material disclosed by the invention has a relatively large BET specific surface area and a multi-stage pore structure characteristic, not only retains the pore structure characteristic of montmorillonite, but also has the pore structure characteristic of ferrihydrite; the ferrihydrite particles with positive charges and the montmorillonite particles with negative charges on the surface are firmly combined to form a stable montmorillonite composite material; and the composite material has typical structural characteristics of silicate minerals and ferrihydrite with a layered structure, and ferrihydrite nanoparticles are of a spherical particle structure and are wrapped by montmorillonite sheets. The montmorillonite composite material disclosed by the invention is applied to a water body or site soil environment containing various heavy metals, and the heavy metals in the environment can be effectively removed.

Description

technical field [0001] The invention relates to the field of mineral materials, in particular to a montmorillonite composite material and its application for adsorbing heavy metals. Background technique [0002] Clay minerals such as montmorillonite are rich in reserves, cheap and easy to obtain, and environmentally friendly. They are the dominant non-metallic minerals in my country. Due to its special structure and properties such as rich micropores, high specific surface area and large pore volume, montmorillonite has been used in the adsorption and control of toxic substances such as heavy metals and organic pollutants in recent years. The structure of montmorillonite is two layers of silicon-oxygen tetrahedron sandwiching a layer of aluminum-oxygen octahedron. Due to isomorphic substitution (such as Al between octahedral layers 3+ By Mg 2+ or Fe 2+ Substitution, Si between tetrahedral layers 4+ By Al 3+ Replacement, etc.), there are excess negative charges between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30B01J20/32C02F1/28B09C1/00C02F101/20
CPCB01J20/12B01J20/06B01J20/28061B01J20/28071B01J20/3085B01J20/32C02F1/288B09C1/00C02F2101/20
Inventor 卜红玲刘承帅陈曼佳徐文坡胡淑捷雷琴凯
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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