Swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane, production and application

A swelling-resistant, nanofiltration membrane technology, applied in membranes, membrane technology, semi-permeable membrane separation, etc., can solve the problems of increased nano-sheet spacing, membrane swelling, etc., to improve separation performance, solve swelling problems, and low cost Effect

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

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Problems solved by technology

[0005] In view of the deficiencies and defects of the above-mentioned prior art, the purpose of the present invention is to provide a kind of anti-swelling two-dimensional SA-MXene layered nanofiltration membrane, preparation and application, to solve the problem that the MXene layered membrane in the prior art is prone to nanosheet spacing Increase, the technical problem of swelling of the film, and at the same time make the MXene film have more excellent screening performance at the level of separation and ion

Method used

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  • Swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane, production and application
  • Swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane, production and application
  • Swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane, production and application

Examples

Experimental program
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Embodiment 1

[0031] Step 1: Lithium fluoride is dissolved in hydrochloric acid to obtain an etchant, and Ti is added to the solution 3 AlC 2 For the precursor, ensure that the mass ratio of the precursor to the etchant is 1:1, stir and react at 45°C for 36 hours; after the reaction is completed, wash it repeatedly with ultrapure water until the pH of the solution is about 5, and finally centrifuge at 3500rpm. Collect the supernatant to obtain stable two-dimensional Ti 3 C 2 T X Nanosheet solution;

[0032] Step 2: At Ti 3 C 2 T X Add 200mPa.s sodium alginate powder with a mass of 5% of the nanosheets to the nanosheet solution, stir and react at room temperature for 12 hours to obtain SA-Ti 3 C 2 T X mixture;

[0033] Step 3: Use suction filtration to make SA-Ti 3 C 2 T X The nanosheets are regularly deposited on a polyvinylidene fluoride film with a pore size of 220nm, and the prepared film is immersed in 10g / L MnCl 2 After the solution was cross-linked for 5 hours, it was dr...

Embodiment 2

[0042] The steps of this example are the same as Example 1, the difference is that the precursor used in Step 1 of this example is Ti 2 AlC.

[0043] The layered membrane prepared in this example and the layered membrane prepared in Example 1 are controlled at 1.60 ± 0.03nm, have good swelling resistance, and have the same ion selectivity in the filtration process. The rejection rates of magnesium chloride, magnesium chloride and sodium sulfate are 94.5%, 35.0% and 33.5% respectively, which can realize the separation of different valence anions. Similarly, Ti, which is also a transition metal carbon / nitride 3 SiC 2 、Ti 3 AlC 2 、Ti 4 AlN 3 and Nb 4 AlC 3 , V 2 AlC etc. are used as precursors to form films, all of which have the same effect.

Embodiment 4

[0045] The procedure of this example is the same as that of Example 1, except that the reaction temperature in this example is 30° C., and the stirring time is 24 hours. The conditions of this embodiment can also prepare the same layered film as in Example 1, but due to the low reaction temperature and stirring time, Ti 3 C 2 T X The yield of nanosheets was slightly reduced.

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Abstract

The invention discloses a production method of a swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane. The production method of the swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane comprises a first step of mixing MXene precursor powder and an etching agent solution, carrying out a stirring reaction, and conducting centrifugal washing to obtain a two-dimensional MXene nanosheet colloid solution; a second step of adding sodium alginate into the two-dimensional MXene nanosheet colloid solution, and evenly stirring and mixing an obtained mixture to obtain SA-MXene nanosheets; and a third step of stacking the SA-MXene nanosheets on a surface of a substrate to produce a membrane, and placing the membrane in a polyvalent metal solution for cross-linking to obtain the swelling-resistant two-dimensional SA-MXene layered nanofiltration membrane. According to the method, by evenly grafting the sodium alginate onto surfaces of MXene nanosheets, through a cross-linking effect of the sodium alginate and polyvalent metal ions, stable hydrophilic cross-linked networks are formed in interlayer channels of the nanosheets, thus the problem of swelling of a layered membrane is solved, meanwhile, due to the fact that the sodium alginate is doped, a large number of oxygen-containing functional groups are introduced onto surfaces of the mass transferchannels, the channel electronegativity is improved, and the layered membrane shows excellent selective filtering performance.

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 SA-MXene layered nanofiltration membrane, its preparation and application. Background technique [0002] Transition metal carbon / nitrogen compounds (MXene) materials are a new class of two-dimensional materials, through the study of ternary layered cermets M n+1 AX n Selective etching of the phase (M is a transition metal element, A is a III or IV main group element, X is C or / and N atoms) to obtain a two-dimensional nanoscale structure similar to graphene. [0003] Compared with materials such as graphene, the preparation process of MXene is simple, the Ti-C multilayer atomic structure makes it have good mechanical properties, and the uniform distribution of -OH, -F, -O functional groups on the surface makes it have a hydrophilic surface. It is an ideal two-dimensional material for constr...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D69/12B01D67/00
CPCB01D61/027B01D69/125B01D2323/30B01D2325/24
Inventor 王琎张治杰王旭东王磊朱甲妮杨冰
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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