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Preparation method of gemini surfactant modified montmorillonite by microwave radiation

A surfactant, microwave radiation technology, applied in chemical instruments and methods, chemical/physical/physical-chemical processes of applying energy, inorganic chemistry, etc., to achieve low-cost, fast, simple, high-efficiency cost, and improve production efficiency.

Inactive Publication Date: 2013-01-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far there are only a few studies on the modification of montmorillonite by microwave radiation, and the research on the preparation of organic montmorillonite by using Jimmy surfactant as a modifier under microwave radiation has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Disperse 1.0g of montmorillonite with a cation exchange capacity of 80meq / 100g in 500ml of deionized water to prepare a suspension with a mass fraction of 0.2%. After stirring at room temperature for 16h, it is placed in a microwave reactor, and the microwave radiation power is adjusted to 400W, the reaction temperature is 60°C. The octadecyl dimethyl ammonium chloride that quality is 0.5 times of montmorillonite cation exchange capacity is dissolved in the isopropanol (the volume of isopropanol solution is identical with the volume of deionized water) of 20% volume concentration, The mixed solution was dropped into the montmorillonite suspension under the stirring condition within 1 minute, and after 5 minutes of reaction, it was centrifuged and washed with isopropanol with a volume concentration of 50% until it was washed with 0.1mol / L AgNO 3 No Cl- was detected, and the modified montmorillonite was obtained after freeze-drying, and the interlayer distance of the modi...

example 2

[0022] Disperse 1.0g of montmorillonite with a cation exchange capacity of 95meq / 100g in 500ml of deionized water to form a suspension with a mass fraction of 2.0%, place it in a microwave reactor after stirring at room temperature for 20 hours, and adjust the microwave radiation power to 800W, the reaction temperature is 80°C. The dodecyl dimethyl ammonium chloride that quality is 0.1 times of montmorillonite cation exchange capacity is dissolved in the isopropanol (the volume of isopropanol solution is identical with the volume of deionized water) of 95% by volume concentration, Obtain a mixed solution; drop the mixed solution into the montmorillonite suspension under agitation within 2 minutes, react for 30 minutes, and then centrifuge and wash with 50% isopropanol until it is washed with 0.1mol / L AgNO 3 No Cl- was detected, the modified montmorillonite was obtained after freeze-drying, and the interlayer spacing of the modified montmorillonite was 1.7nm as measured by X-ra...

example 3

[0024] Disperse 1.0g of montmorillonite with a cation exchange capacity of 105meq / 100g in 100ml of deionized water to form a suspension with a mass fraction of 1.0%, place it in a microwave reactor after stirring at room temperature for 16h, and adjust the microwave radiation power to 700W, the reaction temperature is 80°C. The octadecyl dimethyl ammonium bromide that quality is 0.5 times of montmorillonite cation exchange capacity is dissolved in the isopropanol (the volume of isopropanol solution is identical with the volume of deionized water) of 50% by volume concentration, Obtain a mixed solution; drop the mixed solution into the montmorillonite suspension under agitation within 4 minutes, react for 30 minutes and then centrifugally wash it with 50% isopropanol until it is washed with 0.1mol / L AgNO 3 Detection of Br-free - The modified montmorillonite was obtained after freeze-drying, and the interlayer spacing of the modified montmorillonite was 2.8nm as measured by X-r...

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Abstract

The invention relates to a gemini surfactant modified montmorillonite preparation method by microwave radiation. The preparation method includes the steps of dispersing the montmorillonite into the deionized water to form a suspension liquid having a mass fraction of 0.2 to 1.2%, stirring the suspension liquid for 16 to 24 hours at room temperature, and then placing the suspension liquid into a microwave reactor which is adjusted to have a microwave radiation power of 400 to 800 W, and a radiation temperature of 60 to 80 DEG; dissolving the gemini surfactant which has 0.1 to 0.5 time of montmorillonite cation exchange capacity into the isopropanol which has the same volume of the deionized water and has a volume concentration of 20 to 100% to obtain a mixed liquor; adding the mixed liquorinto the montmorillonite suspension liquid which is under stirring in a dropwise manner within 5 minutes to react for 5 to 30 minutes; centrifugally washing by the isopropanol having a volume concentration of 50% until no C1<->or Br<-> exists; and obtaining the modified montmorillonite having an interlamellar spacing of 1.7 to 2.8 nm after freeze drying. The preparation method has the advantages of less modifier consumption, simple process, short reaction time, easy control of reaction condition, etc., and is favorable for the industrial production and application of organo-montmorillonite.

Description

technical field [0001] The invention relates to a preparation method of modified montmorillonite, in particular to a method for preparing Jimmy's surfactant modified montmorillonite by microwave radiation. Background technique [0002] Montmorillonite is a 2:1 layered aluminosilicate mineral widely distributed in my country. It has the advantages of huge specific surface area, good adsorption, and cheap and easy to obtain. It is widely used as radioactive elements and toxic pollutants. Barrier layer, thickener, wastewater adsorption treatment materials and antibacterial agents, etc. However, the interlayer spacing of natural sodium-based montmorillonite is only about 1.2nm, and it is rich in a large number of hydrophilic groups, which limits its application in the fields of adsorption and preparation of nanocomposites. The modified organic montmorillonite, because the surfactant enters the layered structure of the montmorillonite, makes the interlayer distance significantly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/44B01J19/12
Inventor 王小英刘博孙润仓
Owner SOUTH CHINA UNIV OF TECH