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Self-supporting MXene rigid separation membrane as well as preparation method and application thereof

A separation membrane, self-supporting technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as inability to produce self-supporting membranes, membrane pore blockage, and unfavorable large-scale preparation

Active Publication Date: 2022-03-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 110449032A discloses a method of using sodium alginate to modify and delay the swelling of MXene membranes, which cannot produce self-supporting membranes, and sodium alginate itself blocks the membrane pores
Li Ding et al. (Ding L, LiL, Liu Y, et al. Effective ion sieving with Ti 3 C 2 T x MXene membranes for production of drinking water from seawater[J].Nature Sustainability,2020(3),296-302.) reported a method of modifying surface functional groups by mixing MXene dispersion liquid and aluminum ion aqueous solution to overcome swelling, and using suction filtration to form membranes , the membrane needs to be modified by ions for more than 30 hours, which is not conducive to large-scale preparation and cannot realize the self-supporting structure of the membrane

Method used

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  • Self-supporting MXene rigid separation membrane as well as preparation method and application thereof
  • Self-supporting MXene rigid separation membrane as well as preparation method and application thereof
  • Self-supporting MXene rigid separation membrane as well as preparation method and application thereof

Examples

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preparation example Construction

[0025] The invention provides a kind of preparation method of self-supporting MXene rigid separation membrane, comprises the following steps: the mixed powder of MXene and metal inorganic salt is subjected to hot pressing film formation, obtains self-supporting MXene rigid separation membrane; Said hot pressing film formation The temperature is 150-300°C.

[0026] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0027] In the present invention, the MXene is preferably Ti 3 C 2 T x 、Ti 2 CT x 、Ti 3 CNT x , V 2 CT x 、Ti 4 N 3 T x or Nb 2 CT x .

[0028] In the present invention, the MXene is preferably prepared by itself; the preparation method of the MXene preferably includes: mixing the MAX material corresponding to the MXene, lithium fluoride and hydrochloric acid solution, performing chemical etching, and separating the solid and liquid from the obtained solid The precipit...

Embodiment 1

[0046] MXene and AlCl 3 The powder mass ratio is mixed evenly at a ratio of 1:0.05, and 1g of the mixed powder is put into a custom-made flat film mold with a diameter of 1cm. The hot press is pressed at 1.5MPa and 200°C for 10 minutes to obtain a self-supporting MXene plate separation membrane. The diameter is 1cm and the thickness is 2mm.

[0047] The self-supporting MXene plate-type separation membrane of Example 1 was tested, and the measured pore size was 2-5 nm, and the water flux was 41.1 L / m 2 ·h·bar, belongs to the nanofiltration membrane, the measured conductivity is 324.0S / m, figure 1 It is the physical figure viewed from different angles of the self-supporting flat separation membrane of Example 1. figure 2 It is the SEM figure of embodiment 1 self-supporting flat separation membrane, figure 2 It is shown that the rigid film is composed of lamellar MXene stacks and mosaics.

[0048] Test the self-supporting MXene plate separation membrane for MgSO 4 , NaCl, ...

Embodiment 2

[0050] MXene and Al 2 (SO 4 ) 3 The mass ratio is mixed evenly at a ratio of 1:0.1, and 2g of powder is put into a custom-made tubular membrane mold. The hot press is pressed at 1.5MPa and 250°C for 30 minutes to obtain a self-supporting MXene tubular separation membrane; outer diameter It is 1.5cm and the inner diameter is 1.3cm. Figure 4 The physical picture of the self-supporting MXene tubular separation membrane prepared in Example 2.

[0051] The self-supporting MXene tubular separation membrane of Example 2 was tested, and the measured pore size was 2-5 nm, and the water flux was 53.2 L / m 2 ·h·bar belongs to nanofiltration membrane. The scanning electron microscope observation of the self-supporting MXene tubular separation membrane prepared in Example 2 shows that the self-supporting MXene tubular separation membrane is composed of lamellar MXene stacks and mosaic.

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Abstract

The invention provides a self-supporting MXene rigid separation membrane as well as a preparation method and application thereof, and belongs to the technical field of membranes. The MXene material and the aluminum salt powder are mixed, and one-step hot-pressing film forming is carried out. The pressure enables the powder to form a film and endow the film with rigidity, a self-supporting structure is realized, the temperature rises to enable inorganic metal salt ionic bonds to be broken and enter a molten ion state, free metal cations react with active oxygen-containing functional groups on the surface of MXene to form new chemical bonds (such as Al-O bonds), the chemical bonds are higher in bond energy, a good anti-swelling effect can be realized, and the anti-swelling effect is good. The membrane stability is improved. The separation membrane also has good conductivity and hydrophilicity.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a self-supporting MXene rigid separation membrane and its preparation method and application. Background technique [0002] Since the beginning of the 21st century, the shortage of environmental water resources has become increasingly serious, and seawater desalination technology has become an effective way to solve this problem. Among many desalination technologies, membrane separation has the advantages of low energy consumption, high efficiency, and no phase change. Two-dimensional nanomaterials represented by graphene are widely used in seawater desalination due to their special morphology and good chemical stability. received great attention. MXene, as a new type of two-dimensional material, is easier to prepare than graphene, and has better conductivity and hydrophilicity. Its unique nanoscale interlayer structure can be used as the channel of the membrane to achieve sel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C02F1/44
CPCB01D71/02B01D67/0039C02F1/44B01D2325/26Y02A20/131C01B32/907C01B32/921B01D71/028B01D61/025B01D2323/21815B01D67/00416B01D2323/56B01D71/0221B01D2323/21817B01D67/0058B01D67/006B01D67/0076B01D69/02B01D71/021B01D2323/08B01D2323/10B01D2323/12B01D2323/28B01D2323/36B01D2325/28B01D2325/36
Inventor 陈硕苑承禹张奇魏高亮全燮
Owner DALIAN UNIV OF TECH
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