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

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...

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