Two-dimensional layered vermiculite membrane, production and application

A two-dimensional layered, vermiculite technology, applied in the direction of membrane, membrane technology, semi-permeable membrane separation, etc., can solve the problems of separation membrane structural defects, poor filtration performance, etc., to achieve large size, excellent solvent molecule permeability , the effect of high retention rate

Active Publication Date: 2019-11-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies and defects of the above-mentioned prior art, the object of the present invention is to provide a two-dimensional layered vermiculite membrane, its preparation and application, and solve the technical problems of structural defects and poor filtration performance of the separation membrane in the prior art

Method used

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  • Two-dimensional layered vermiculite membrane, production and application
  • Two-dimensional layered vermiculite membrane, production and application
  • Two-dimensional layered vermiculite membrane, production and application

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Add heat-expandable vermiculite particles into lithium chloride solution, and stir magnetically for 24 hours at an oil bath temperature of 120° C., wherein the mass ratio of heat-expandable vermiculite, water, and LiCl is 1:35:3. Then centrifuge and wash until no chloride ions can be detected in the supernatant, and powder A is obtained.

[0032] Step 2: Add powder A powder into 30% hydrogen peroxide solution at a mass ratio of 1:35, stir magnetically for 48 hours at an oil bath temperature of 150° C., and then centrifuge and wash it to obtain powder B.

[0033] Step 3: Add B powder to 100ml deionized water, centrifuge at 6000rpm for 40min to remove small flakes and impurities, then centrifuge at 2000rpm for 60min, absorb the upper liquid to obtain a stable two-dimensional vermiculite nanosheet colloidal solution with a concentration of 8.0g / L.

[0034] Step 4: Take the vermiculite nanosheet solution obtained in step 3, and use a vacuum filtration device to st...

Embodiment 2

[0044] The steps of this example are the same as those of Example 1, except that the mass ratio of thermally expanded vermiculite, water and LiCl in step 1 is 1:40:5. In this embodiment, single-layer vermiculite nanosheets with substantially the same size as in Example 1 can be prepared, and the colloidal solution of nanosheets is 6.7 g / L. Through the test of the separation performance of the vermiculite film, it is found that the selectivity of the vermiculite film prepared in this example to molecules and ions is basically consistent with that of Example 1.

Embodiment 3

[0046]The steps of this example are the same as in Example 1, the difference is that the stirring time of step 1 is 18h, and this example can prepare a single-layer vermiculite nanosheet that is basically the same as that of Example 1, and the size of the vermiculite nanosheet is not affected by the stirring reaction time. However, the nanosheet colloidal solution was slightly lower at 6.5g / L. Through the test of the separation performance of the vermiculite film, it is found that the selectivity of the vermiculite film prepared in this example to molecules and ions is basically consistent with that of Example 1.

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Abstract

The invention discloses a two-dimensional layered vermiculite membrane and a production method thereof. The production method of the two-dimensional layered vermiculite membrane comprises the following steps of (1) mixing thermally-expanded vermiculite and a LiCl solution, and conducting heating, stirring, centrifugation and washing to produce powder A; (2) mixing the powder A and hydrogen peroxide, and conducting heating, stirring, centrifugation and washing to produce powder B; (3) mixing the powder B and water, conducting stirring at normal temperature, and after high-speed centrifugation and purification are conducted, conducting low-speed centrifugation to obtain a high-concentration large-size two-dimensional vermiculite nanosheet solution; and (4) stacking two-dimensional vermiculite nanosheets produced in the step (3) on a surface of a porous substrate layer by layer regularly to obtain the two-dimensional layered vermiculite membrane. The vermiculite nanosheets produced through the method have the advantages that the sheet layer size is large, the yield is high, the production cost is low, and the technology process is simple. According to the method, the thermally-expanded vermiculite is used for producing the two-dimensional layered vermiculite membrane, the produced two-dimensional layered vermiculite membrane has excellent membrane separation performance, and not only are solvent molecules and ions precisely intercepted, but also a high solvent penetration level is maintained.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and functional films, and in particular relates to a two-dimensional layered vermiculite film, its preparation and application. Background technique [0002] Since the discovery of graphene materials in 2004, graphene and graphene-like two-dimensional nanomaterials have shown great application potential in many fields such as energy storage, optics, biology and sensing. In the field of membrane separation technology, two-dimensional nanosheets are stacked in parallel and regular layers to form a macroscopic layered film. Using a large number of interlayer nanochannels in the film, it can achieve faster and more accurate transmission than traditional polymer films. Screening performance. Jin Wanqin CN103611431B and Wang Haihui CN106178979A respectively reported the excellent properties of two-dimensional layered membranes such as graphene oxide and MXene in the separation of molecules ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D67/00C02F1/44C02F101/30C02F101/36C02F101/38C02F101/34C02F101/10
CPCB01D67/0039B01D67/0062B01D69/105B01D69/12B01D2323/50C02F1/44C02F2101/10C02F2101/308C02F2101/34C02F2101/36C02F2101/38
Inventor 王琎杨冰田梦涛王磊张治杰朱甲妮
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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