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Method for preparing montmorillonite nano-sheets through gas phase stripping

A technology of montmorillonite nanosheets and vapor phase exfoliation, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low exfoliation efficiency, and achieve the effect of improving exfoliation efficiency, simple process and low cost

Active Publication Date: 2019-09-17
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But usually the melting stripping method has low stripping efficiency

Method used

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  • Method for preparing montmorillonite nano-sheets through gas phase stripping
  • Method for preparing montmorillonite nano-sheets through gas phase stripping
  • Method for preparing montmorillonite nano-sheets through gas phase stripping

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 1 g of Naki montmorillonite, put it in a beaker, put it into a blast drying oven, dry it at 60°C for 8 hours, take out the montmorillonite, and cool it to room temperature for later use. Put the dried montmorillonite into a 200 mL conical flask, add 50 mL of liquid nitrogen to the conical flask, and let it stand after the liquid nitrogen is completely vaporized. Repeat the above gasification-standstill steps for a total of 5 times to obtain montmorillonite nanosheets.

[0023] figure 1 are the XRD patterns of the montmorillonite as-is used in this example and the montmorillonite nanosheets after stripping, figure 1 The characteristic peak (001) shifts after the middle montmorillonite is peeled off. According to the Bragg equation 2dsinθ=λ, the montmorillonite layer spacing before peeling is d=1.263nm, and the montmorillonite layer spacing after peeling is d=1.506nm, indicating that the montmorillonite layer spacing is d=1.506nm. The soil was successfully strippe...

Embodiment 2

[0026] Weigh 1 g of Naki montmorillonite, put it in a beaker, put it into a blast drying oven, dry it at 60°C for 8 hours, take out the montmorillonite, and cool it to room temperature for later use. Put the dried montmorillonite into a 200 mL conical flask, add 50 mL of liquid nitrogen to the conical flask, and let it stand after the liquid nitrogen is completely vaporized. Repeat the above gasification-standing step for a total of 10 times to obtain montmorillonite nanosheets. The obtained montmorillonite has a calculated interlayer spacing of 1.503 nm.

Embodiment 3

[0028] Weigh 1 g of Naki montmorillonite, put it in a beaker, put it into a blast drying oven, dry it at 60°C for 8 hours, take out the montmorillonite, and cool it to room temperature for later use. Put the dried montmorillonite into a 200 mL conical flask, and put the montmorillonite into a 150W ultrasonic cleaner for ultrasonic vibration for 10 min to obtain montmorillonite nanosheets. The calculated interlayer spacing of the obtained montmorillonite was 1.523 nm.

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Abstract

The invention relates to a method for gas phase stripping of montmorillonite nano-sheets. The method comprises: (1) placing montmorillonite into an air blasting drying box, and drying for 6-8 h at a temperature of 60-80 DEG C; (2) placing the montmorillonite obtained in the step (1) in a reaction bottle filled with 50-100 mL liquid nitrogen until the liquid nitrogen is completely vaporized; (3) standing the montmorillonite obtained in the step (2), and taking out so as to be spare after the temperature of the montmorillonite is restored to a room temperature; and (4) repeatedly performing the steps (2)-(3) 1-10 times. According to the present invention, the method solves the problems of consumption of a large amount of mediums, high energy consumption, long process flow, environmental pollution, easy destruction on the lamellar structure and the like in the stripping process of the montmorillonite, and has advantages of simple process, low cost, environment protection, montmorillonite stripping difficulty reducing and stripping efficiency improving.

Description

technical field [0001] The invention relates to a method for peeling off montmorillonite nanosheets, in particular to a method for gas phase peeling off montmorillonite nanosheets, and belongs to the technical field of nanomaterials. Background technique [0002] Montmorillonite is a silicate mineral. The special layered structure of montmorillonite makes it excellent in material modification and synthesis of composite materials. Multi-layer montmorillonite exfoliated into few or single layers of montmorillonite can improve the aspect ratio and specific surface area of ​​montmorillonite. Studies have shown that high aspect ratios can significantly enhance the barrier properties and mechanical properties of nanocomposites. The high specific surface area can effectively improve its adsorption and chemical activity. Montmorillonite also has the advantages of low price, non-toxicity and large specific surface area, so montmorillonite is called "universal material". [0003] ...

Claims

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Application Information

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IPC IPC(8): C01B33/40B82Y30/00B82Y40/00
CPCC01B33/40B82Y30/00B82Y40/00C01P2002/72C01P2004/03
Inventor 李三喜刘仁杰王松李洋
Owner SHENYANG POLYTECHNIC UNIV
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