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Modified Nb2CTx nanosheet membrane and preparation method thereof

A nanosheet and modification technology, applied in chemical instruments and methods, permeation/dialysis water/sewage treatment, membranes, etc., can solve problems such as unclear relationships and achieve great guiding significance

Pending Publication Date: 2022-03-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to develop 2D membranes without compromising good separation performance, it is important to understand ion transport phenomena within confined nanochannels, which have rarely been reported
In addition, numerous studies have reported the water permeation activity within confined capillary nanochannels, but the relationship between interconnected nanochannels formed by surface-modified 2D nanosheets and permeates within nanochannels remains unclear.

Method used

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  • Modified Nb2CTx nanosheet membrane and preparation method thereof
  • Modified Nb2CTx nanosheet membrane and preparation method thereof
  • Modified Nb2CTx nanosheet membrane and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] The embodiment of the present invention provides a polyacrylic acid modified Nb 2 CT x The preparation method of the nanosheet film, the specific process is as follows:

[0049] 2mg / ml Nb 2 CT x The MXene suspension was mixed with 1 mg / ml polyacrylic acid aqueous solution in a weight ratio of 1:1, and ultrasonically mixed for 24 h to obtain Nb 2 CTx-PAA suspension; Nb 2 The CTx-PAA suspension was uniformly distributed on the surface of the polyvinylidene fluoride film (pore size 0.22 μm, diameter 47 mm) by vacuum filtration (~0.7 bar) to form Nb 2 CT x -PAA thin layer, dried for 3 days and separated from the polyvinylidene fluoride film to obtain Nb 2 CT x -PAA nanosheet membrane.

Embodiment 2

[0051] The embodiment of the present invention provides a polyvinyl alcohol modified Nb 2 CT x The preparation method of the nanosheet film, the specific process is as follows:

[0052] 2mg / ml Nb 2 CT x The MXene suspension was mixed with a 1 mg / ml polyvinyl alcohol aqueous solution in a weight ratio of 1:1, and ultrasonically mixed for 24 h to obtain Nb 2 CTx-PVA suspension; Nb 2 The CTx-PVA suspension was uniformly distributed on the surface of the polyvinylidene fluoride film (pore size 0.22 μm, diameter 47 mm) by vacuum filtration (~0.7 bar) to form Nb 2 CT x -PVA thin layer, dried for 3d and separated from the polyvinylidene fluoride film to obtain Nb 2 CT x -PVA nanosheet membrane.

Embodiment 3

[0054] The embodiment of the present invention provides a kind of gallic acid modified Nb 2 CT x The preparation method of the nanosheet film, the specific process is as follows:

[0055] 2mg / ml Nb 2 CT x The MXene suspension was mixed with 1 mg / ml gallic acid aqueous solution in a weight ratio of 1:1, and ultrasonically mixed for 24 h to obtain Nb 2 CTx-GA suspension; Nb 2 The CTx-GA suspension was uniformly distributed on the surface of the polyvinylidene fluoride film (pore size 0.22 μm, diameter 47 mm) by vacuum filtration (~0.7 bar) to form Nb 2 CT x -GA thin layer, after drying for 3d, it is separated from the polyvinylidene fluoride film to obtain Nb 2 CT x -GA nanosheet membrane.

[0056] figure 1 This is the characterization result of the nanosheets prepared in the embodiment of the present invention.

[0057] in, figure 1 a is Nb 2 CT x Cross-sectional field emission scanning electron microscope images of MXene nanosheets, figure 1 b. figure 1 c and ...

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Abstract

The invention discloses a modified Nb2CTx nanosheet membrane and a preparation method thereof.The preparation method comprises the steps that a modifier is added into Nb2CTxMXene suspension liquid to be subjected to ultrasonic mixing, then the modifier is evenly distributed on the surface of a polyvinylidene fluoride membrane through vacuum filtration to form a modified Nb2CTx thin layer, and the modified Nb2CTx thin layer is separated from polyvinylidene fluoride after being dried. The modifier is a functional organic matter capable of providing hydroxyl and / or carboxyl. The invention discusses the basic concept of ion transport operation and a two-dimensional nanosheet surface modification method for selective ion separation, the mixed carboxyl and hydroxyl modified surface brings a new thought for the design of an ion selective membrane, the cognition of the transport of solvated ions in a nano limited two-dimensional channel is further improved, and the potential application of the solvated ions is explored; different from a traditional size exclusion mechanism and low-selectivity cognition of a 2D material-based membrane, the invention discloses an interconnected ionized water network in a membrane matrix under high ion concentration.

Description

technical field [0001] The invention belongs to the technical field of functional membrane separation, and more particularly, relates to a modified Nb 2 CT x Nanosheet film and preparation method thereof. Background technique [0002] Due to the increasing demand for freshwater, seawater desalination, purification, and ion transport through functional membranes with well-controlled nano-confined channels formed by 2D nanosheets have attracted considerable attention. In addition to water, seawater (brine) contains many other components, such as lithium and magnesium salts, which are valuable resources in energy-related applications. [0003] However, lithium and magnesium salts extracted from seawater are difficult to separate due to the similarity of their chemical and physical properties, thus limiting their comprehensive utilization. Layered membranes formed from 2D nanosheets have been shown to have high rejection or water permeability for a variety of independent salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/06B01D69/02B01D67/00B01D61/00C02F1/44
CPCB01D71/02B01D69/06B01D69/02B01D67/0039B01D61/00C02F1/44B01D2325/42
Inventor 胡文吉豪黄俊楠付奕铭赵飞平柯勇沈锋华
Owner CENT SOUTH UNIV
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