A kind of anti-swelling two-dimensional layered film with controllable interlayer channel size, preparation and application

A two-dimensional layered, interlayer channel technology, applied in the direction of membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of resin encapsulation method process, complexity, etc., achieve low cost, improve swelling problem, repeat sex high effect

Active Publication Date: 2021-11-16
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

[0004] In view of the above technical problems, the present invention provides a swelling-resistant two-dimensional layered film with controllable interlayer channel size, its preparation and application, which solves the existing problems, and solves the problem of swelling in the existing two-dimensional layered film, and the current Some resin encapsulation methods that limit film swelling are complicated in the process

Method used

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  • A kind of anti-swelling two-dimensional layered film with controllable interlayer channel size, preparation and application
  • A kind of anti-swelling two-dimensional layered film with controllable interlayer channel size, preparation and application
  • A kind of anti-swelling two-dimensional layered film with controllable interlayer channel size, preparation and application

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preparation example Construction

[0025] A method for preparing a swelling-resistant two-dimensional layered film with controllable interlayer channel size of the present invention mainly includes:

[0026] Step 1, depositing two-dimensional nanosheets on the surface of the substrate to obtain an undisturbed layered film;

[0027] Preferably, the two-dimensional nanosheet suspension is deposited on the surface of the substrate by suction filtration, spin coating or spray coating; the substrate is preferably a polyvinylidene fluoride film, a mixed cellulose ester film, a polypropylene film or an anodized aluminum filter membrane, The pore size of the substrate is 50-450nm.

[0028] Wherein, the preparation of the suspension of two-dimensional nanosheets is an existing traditional preparation method, and the preparation method in the following examples is preferred. The two-dimensional nanosheets of the present invention can be selected from graphene oxide nanosheets, MXene nanosheets, clay material nanosheets ...

Embodiment 1

[0035] Step 1, add 1g lithium fluoride to 20mL6M hydrochloric acid, stir and dissolve to obtain etchant solution, then add 1gTi 3 AlC 2 After reacting for 36 hours, the reaction product was repeatedly washed with deionized water until the pH of the solution was greater than 5; the suspended liquid with a pH greater than 5 was centrifuged at 3500 rpm for 1 h to obtain a stable Ti 3 C 2 nanosheet suspension; adopt vacuum filtration to make Ti 3 C 2 T x The nanosheets were regularly deposited on the polyvinylidene fluoride film with a pore size of 220 nm, and dried at room temperature to obtain the original Ti 3 C 2 T x film.

[0036] The cross-sectional view of the undisturbed film prepared in this embodiment is as follows figure 1 As shown, it can be seen that the nanosheets are stacked on the surface of the substrate by layer-by-layer parallel contact.

[0037] Step 2, the original state Ti 3 C 2 T x The film is soaked in sodium chloride solution for 2 hours, taken...

Embodiment 2

[0048] The difference between this embodiment and embodiment 1 is that the solvent used in step 2 of this embodiment is aluminum chloride.

[0049] The two-dimensional layered film prepared in this example maintains good swelling resistance, the interlayer spacing is stable at 1.95nm, and the Na + The speed of the permeable film increases by about 3% relative to Example 1, and the Mg 2+ The permeation rate increased by about 7% relative to Example 1, which is more conducive to the realization of Na + , Mg 2+ separation.

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Abstract

The invention discloses a swelling-resistant two-dimensional layered film with controllable interlayer channel size, its preparation and application. First, two-dimensional nanosheets are deposited on the surface of a substrate to obtain an original layered film; then the original layered film is immersed in a solvent After swelling in medium, put NaOH and AlCl 3 soaked in the mixed solution to obtain a two-dimensional layered film. The preparation method of the present invention can construct two-dimensional layered films with different interlayer distances, which can be used in the field of membrane separation to achieve accurate screening of different molecules or ions; , the interlayer spacing of the film of the present invention basically does not change, which improves the swelling problem commonly faced by two-dimensional layered films.

Description

technical field [0001] The invention belongs to the technical field of film preparation and separation and purification, and in particular relates to a swelling-resistant two-dimensional layered film with controllable interlayer channel size, its preparation and application. Background technique [0002] Membrane separation technology is a separation and purification technology that has developed rapidly in recent years, and is known as "the green separation technology of the 21st century". In recent years, the preparation of separation membranes using two-dimensional nanomaterials has become a hot spot in the field of membrane separation technology. Studies have shown that compared with traditional polymer membranes, two-dimensional layered membranes can achieve faster selective screening, breaking through The contradictory relationship between permeability and selectivity in the traditional membrane separation process (Trade-off effect). At present, there are many technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D71/26B01D71/18B01D71/02B01D67/00
CPCB01D67/00B01D71/025B01D71/18B01D71/26B01D71/34
Inventor 王琎朱甲妮王磊张治杰杨冰王旭东
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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