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Method for preparing two-dimensional near-monolayer montmorillonite

A montmorillonite and single-layer technology, which is applied in the field of preparing two-dimensional near-monolayer montmorillonite, can solve the problems of refractory biodegradation, adverse effects of water environment or groundwater environment, etc., and achieve the effect of good repeatability and stable properties

Inactive Publication Date: 2019-01-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The surfactants used in the above method of preparing nearly monolayer montmorillonite are difficult to biodegrade and may have adverse effects on the water environment or groundwater environment

Method used

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  • Method for preparing two-dimensional near-monolayer montmorillonite

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Experimental program
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Effect test

Embodiment 1

[0019] Add 1 gram of powdered sodium montmorillonite to 100 ml of pure water, and stir at a controlled speed of 200 rpm for 45 minutes to obtain a uniformly mixed montmorillonite suspension; place the probe of the ultrasonic breaker in the uniform solution, and ultrasonicate for 30 Minutes, then centrifuge the sonicated montmorillonite suspension at 8000rpm for 10 minutes, and take the upper suspension. Then freeze-dry the upper suspension to obtain a solid two-dimensional near-single-layer montmorillonite, which is the product. The product is a nearly monolayer montmorillonite with an average particle size of 230 nm and an average thickness of 2.5 nm. Its AFM image is as follows figure 1 shown. It can be seen from the figure that the obtained two-dimensional montmorillonite product is a uniform sheet with a thickness of about 1.5 nanometers.

Embodiment 2

[0021] Add 1 gram of powdered sodium montmorillonite to 100 ml of pure water, and stir at a controlled speed of 200 rpm for 120 minutes to obtain a uniformly mixed montmorillonite suspension; place the probe of the ultrasonic breaker in the uniform solution, and ultrasonically Minutes, then centrifuge the sonicated montmorillonite suspension at 8000rpm for 10 minutes, and take the upper suspension. Then freeze-dry the upper suspension to obtain a solid two-dimensional near-single-layer montmorillonite, which is the product. The product is nearly monolayer montmorillonite, with an average particle size of 230 nanometers and an average thickness of 2.5 nanometers.

Embodiment 3

[0023] Add 1 gram of powdered sodium montmorillonite to 100 ml of pure water, and stir at a controlled speed of 200 rpm for 45 minutes to obtain a uniformly mixed montmorillonite suspension; , continuously stirred for 3 days, then centrifuged the stirred montmorillonite suspension at 8000rpm for 10 minutes, and took the upper suspension; finally, freeze-dried the upper suspension to obtain a solid two-dimensional near monolayer montmorillonite, namely product. The product is nearly monolayer montmorillonite, with an average particle size of 230 nanometers and an average thickness of 2.5 nanometers.

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Abstract

The invention relates to a method for preparing two-dimensional near-monolayer montmorillonite. Powdery sodium montmorillonite is added into pure water to be stirred until being completely dispersed to obtain a montmorillonite suspension liquid; ultrasonic or stirring treatment is carried out on the montmorillonite suspension liquid, and then centrifugation is carried out to take an upper layer suspension liquid; vacuum freezing drying is carried out on the upper layer suspension liquid to obtain a white cotton-shaped two-dimensional near-monolayer montmorillonite sample, that is a product. Compared with the prior art, the method for preparing the two-dimensional near-monolayer montmorillonite has the advantages that the preparation method is simple and easy to carry out, the repeatabilityis good, the obtained two-dimensional near-monolayer montmorillonite has stable properties, can be produced on a large scale, and is used for adsorbents, fungicidal drugs, dielectric, catalyst carriers and the like.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing two-dimensional near-single-layer montmorillonite. Background technique [0002] Natural massive montmorillonite is a mineral material with a layered structure, the surface is negatively charged, the layers are connected by van der Waals force, and there are metal cations (Na + 、K + , Ca 2+ Wait). In recent years, with graphene, C 3 N 4 With the rise of new two-dimensional near-single-layer nanomaterials, montmorillonite-type hydroxide two-dimensional nanomaterials have also begun to receive attention. Previously, based on the structural characteristics of natural montmorillonite, Cui et al. used cation exchange to allow surfactants to enter the interlayer of montmorillonite, and then prepared a nearly monolayer montmorillonite by click chemistry. Yan et al. used CTAB and montmorillonite interlayer Na + exchange, and then obtain a nearly ...

Claims

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Application Information

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IPC IPC(8): C01B33/40B82Y30/00
CPCB82Y30/00C01B33/40C01P2004/04C01P2004/64
Inventor 赵美林思劼秦瑶
Owner TONGJI UNIV
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