Preparation method of double-layer Mxene film based on different interlayer spacing

A layer-spacing, double-layer technology is applied in the field of preparation of double-layer Mxene membranes, which can solve the problems of complex separation and preparation process, low membrane chemical stability, and high preparation requirements, and achieve high economic feasibility, easy preparation method, and low solute backmix small effect

Active Publication Date: 2021-10-01
CHONGQING TECH & BUSINESS UNIV
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  • Abstract
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Problems solved by technology

However, the separation and preparation process is complicated, the preparation requirements are very high, and the chemical stability of the prepared membrane is not high.

Method used

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  • Preparation method of double-layer Mxene film based on different interlayer spacing

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Experimental program
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Effect test

Embodiment 1

[0028] Bilayer Mxene films based on different interlayer spacings were prepared in the following manner:

[0029] 1) Mix HCl, LiF and Ti with a mass ratio of 10:1:1 3 AlC 2 They were added to the reactor in turn, heated and stirred at 30 °C for 24 h, and then the mixture in the reactor was transferred to a centrifuge tube, washed and centrifuged repeatedly, and then the washed clay-like precipitate was transferred to a large-mouth bottle for ultrasonic peeling and centrifugation. The supernatant is obtained as MXene monolayer nanosheet solution.

[0030] 2) Take a piece of PVDF membrane with a pore size of 0.22 μm and put it on the assembled suction filtration device, and mix the Mxene single-layer nanosheet solution obtained in step 1) with magnesium chloride and maleic acid, according to 1:0.5:0.5 equal volume The concentration ratios were mixed, vacuum filtered on the PVDF base membrane, and placed at 70° C. for 5 hours to obtain a Mxene membrane.

[0031] 3) Then take the...

Embodiment 2

[0033] Two-layer Mxene films based on different layer spacings were prepared in the following ways:

[0034] 1) HCl, LiF and Ti with a mass ratio of 12:1.2:1 3 AlC 2 Put them into the reactor one by one, heat and stir at 32°C for 30 hours, then transfer the mixture in the reactor to a centrifuge tube, wash and centrifuge repeatedly, and then transfer the washed clay-like precipitate to a jar for ultrasonic stripping and centrifugation. The supernatant is the MXene monolayer nanosheet solution.

[0035] 2) Take a piece of PVDF membrane with a pore size of 0.22 μm and put it on the assembled suction filtration device, and mix the Mxene single-layer nanosheet solution obtained in step 1) with magnesium chloride and maleic acid, according to 1:0.6:0.6 equal volume The concentration ratios were mixed, vacuum filtered on the PVDF base membrane, and placed at 72° C. for 5.2 hours to obtain a Mxene membrane.

[0036] 3) Then take the mixed solution of MXene solution, sodium chlorid...

Embodiment 3

[0038] Two-layer Mxene films based on different layer spacings were prepared in the following ways:

[0039] 1) HCl, LiF and Ti with a mass ratio of 15:1.4:1 3 AlC 2 Put them into the reactor one by one, heat and stir at 35°C for 36 hours, then transfer the mixture in the reactor to a centrifuge tube, wash and centrifuge repeatedly, and then transfer the washed clay-like precipitate to a jar for ultrasonic stripping and centrifugation. The supernatant is the MXene monolayer nanosheet solution.

[0040] 2) Take a piece of PVDF membrane with a pore size of 0.22 μm and put it on the assembled suction filtration device, and mix the Mxene single-layer nanosheet solution obtained in step 1) with magnesium chloride and maleic acid, according to 1:0.8:0.8 equal volume The concentration ratios were mixed, vacuum filtered on the PVDF base membrane, and placed at 75° C. for 5.5 hours to obtain a Mxene membrane.

[0041] 3) Then take the mixed solution of MXene solution, sodium chlorid...

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Abstract

The invention discloses a preparation method of a double-layer Mxene membrane based on different interlayer spacing, which comprises the following steps: taking titanium aluminum carbide (Ti3AlC2), hydrochloric acid (HCl) and lithium fluoride (LiF) as raw materials and PVDF (Polyvinylidene Fluoride) as a base membrane, sequentially adding HCl, LiF and Ti3AlC2 in a mass ratio of (10-20): (1-1.8): 1 into a reactor, heating and stirring at 30-40 DEG C for 24-48 hours, and repeatedly washing, centrifuging and ultrasonically stripping to obtain an Mxene solution; taking a mixed solution of the MXene solution, magnesium chloride (MgCl) and maleic acid (MA) in an isovolumetric concentration ratio of 1: (0.5-1): (0.5-1), carrying out vacuum suction filtration on a base membrane, and carrying out vacuum drying at 70-80 DEG C for 5-6 hours to obtain an MXene membrane; and then taking a mixed solution of an MXene solution, sodium chloride (NaCl) and suberic acid (SA) with the isovolumetric concentration ratio of 1: (0.5-1): (0.5-1), carrying out vacuum suction filtration on the MXene membrane, and carrying out vacuum drying for 5-6 hours at the temperature of 70-80 DEG C to obtain the double-layer MXene membrane. The preparation method disclosed by the invention is simple, and the obtained double-layer membrane has relatively high water flux and salt rejection rate and relatively low reverse salt flux, can filter substances with different molecular sizes, and is mainly applied to the field of hard water softening.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional nano-film preparation and liquid separation, and in particular relates to a preparation method of double-layer Mxene films based on different interlayer distances. Background technique [0002] In recent years, two-dimensional material layered membranes have received more and more attention due to their regular channels and high permeability, and research on the regulation and improvement of layered membranes has gradually become the current development trend. Among them, MXene has special electrochemical properties and exhibits excellent performance in electrochemical energy storage elements. On the other hand, such two-dimensional membranes composed of stacked MXene nanosheet units have regular and controllable transport channels, abundant surface functional groups, and hydrophilic properties, enabling the transport of water and organic solvents, and at the same time being able to transp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D67/00B01D69/12B01D71/02B01D71/34
CPCB01D71/34B01D71/02B01D69/12B01D67/0079B01D61/002
Inventor 郭彬彬唐晓旻
Owner CHONGQING TECH & BUSINESS UNIV
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