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Organic modified montmorillonite composite material and application thereof

A technology of composite materials and montmorillonite, which is applied in the field of organically modified montmorillonite composite materials, can solve the problems of secondary pollution and low heavy metal adsorption efficiency, achieve low equipment requirements, simple and easy preparation process, and improve adsorption effect Effect

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

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of low adsorption efficiency of montmorillonite to heavy metals and secondary pollution in the preparation process of modified montmorillonite in the prior art, one of the purposes of the present invention is to provide a kind of organically modified montmorillonite composite material. The second object is to provide the preparation method of this organically modified montmorillonite composite material, and the third object of the present invention is to provide the application of this organically modified montmorillonite composite material in the adsorption of heavy metals

Method used

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  • Organic modified montmorillonite composite material and application thereof
  • Organic modified montmorillonite composite material and application thereof
  • Organic modified montmorillonite composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In this example, the steps for preparing the organically modified montmorillonite composite material are as follows:

[0058] (1) Take the montmorillonite raw material, the montmorillonite raw material is calcium-based montmorillonite, pulverize, pass through a 200-mesh sieve, settle and purify to obtain montmorillonite powder.

[0059] (2) Get the montmorillonite powder that 10g step (1) obtains, add 200mL concentration and be in the sodium chloride solution of 0.5mol / L, stir on the magnetic stirrer, the rotating speed is 550rpm, and the temperature is constant at 80 ℃; After 24h, put The montmorillonite is separated from the solution, and fresh sodium chloride solution is added again, and the exchange is repeated twice; the solution after the cation exchange is centrifuged, and the solid residue is washed with deionized water, and detected with silver nitrate solution until there is no chloride ion , to obtain sodium-based montmorillonite, which was stored after freez...

Embodiment 2

[0067] In this case, the organically modified montmorillonite composite material adsorbs cationic heavy metal cadmium, and the steps are as follows:

[0068] (1) With cadmium nitrate (Cd(NO 3 ) 2 ) is Cd 2+ source, prepare 50.0mL of Cd 2+ Solution, the concentration is set to 1mg / L, 5mg / L, 10mg / L, 25mg / L, 50mg / L, 75mg / L, 100mg / L, and the pH value of the solution is adjusted to 3.0 and 5.0.

[0069] (2) Weigh 50 mg of the organically modified montmorillonite composite material prepared in Example 1, add it to the prepared solution, and centrifuge after fully shaking and reacting for 24 hours. The supernatant is filtered with a 0.22 micron water filter head, and the filtrate is Preserve and test the Cd concentration using an inductively coupled plasma emission spectrometer; the measured pH value is 3.0, the saturated adsorption capacity of the organically modified montmorillonite composite material to Cd is 13.99 mg / g, and the pH value is 5.0. The saturated adsorption capaci...

Embodiment 3

[0074] In this case, the organically modified montmorillonite composite material adsorbs cationic heavy metal cadmium, and the steps are as follows:

[0075] (1) With cadmium nitrate (Cd(NO 3 ) 2 ) is Cd 2+ source, prepare 50.0mL of Cd 2+ solution, the concentration is set to 1mg / L, 5mg / L, 10mg / L, 25mg / L, 50mg / L, 75mg / L, 100mg / L, and the pH value of the solution is adjusted to 7.0.

[0076] (2) Weigh 50 mg of the organically modified montmorillonite composite material prepared in Example 1, add it to the prepared solution, and centrifuge after fully shaking and reacting for 24 hours. The supernatant is filtered with a 0.22 micron water filter head, and the filtrate is Save and test the Cd concentration by inductively coupled plasma optical emission spectrometer; the measured pH value is 7.0, the saturated adsorption capacity of organically modified montmorillonite composite material for Cd is 21.17mg / g.

[0077] The schematic diagram of the adsorption capacity of organically...

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Abstract

The invention discloses an organic modified montmorillonite composite material and application thereof. The organic modified montmorillonite composite material is prepared from montmorillonite and 12-amino dodecanoic acid, wherein the 12-amino dodecanoic acid is dispersed between layers of the montmorillonite; the mass percent of organic matters in the organic modified montmorillonite composite material is greater than or equal to 15%; and the specific surface area of the organic modified montmorillonite composite material is greater than or equal to 40.0 m < 2 > the organic modified montmorillonite composite material disclosed by the invention retains the cation exchange property of natural montmorillonite, and has relatively high organic carbon content and internal interlayer spacing; the raw materials required for preparing the organic modified montmorillonite composite material are rich in reserves and low in price, and do not cause pollution to the environment in the use process; and the organic modified montmorillonite composite material as an adsorbent has high adsorption efficiency on heavy metals.

Description

technical field [0001] The invention relates to the field of mineral materials, in particular to an organically modified montmorillonite composite material and its application. Background technique [0002] Montmorillonite is a layered silicate clay mineral with rich micropores, high cation exchange capacity, good expansion characteristics and large surface area, and has good adsorption capacity for heavy metals. Due to its abundant reserves, low cost and environmental friendliness, montmorillonite has been widely used in the pollution control of heavy metals. However, the binding force between cations in natural montmorillonite and montmorillonite sheets is weak, and its active sites can be re-exchanged by other cations (including inorganic cations and organic cations), resulting in a decrease in the adsorption effect. [0003] To overcome this weakness, organic modification of montmorillonite is one of the important means. In recent years, in the research on organically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30
CPCB01J20/12B01J20/28057B01J20/3085B01J20/3071
Inventor 徐文坡卜红玲刘承帅陈曼佳童辉龙胜桥
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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