MOFs compound film, preparation method and application thereof

A composite membrane and support membrane technology, applied in the field of composite membranes, can solve the problems of inability to precisely control the density of ion channels, achieve excellent scalability, reduce crystallization, and improve selectivity

Inactive Publication Date: 2017-12-08
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prior art discloses a variety of ion exchange membranes with the ability to selectively pass through monovalent ions, the current traditional chemical methods cannot achieve precise regulation of the ion channels and density of the membranes.

Method used

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  • MOFs compound film, preparation method and application thereof
  • MOFs compound film, preparation method and application thereof
  • MOFs compound film, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1.1 Put a commercial porous alumina base membrane with a pore size of 80-100 nm on figure 1Fix it in the reaction device shown, check whether it leaks, and add a gasket if it leaks.

[0033] 1.2 Add 40mL of 2.7mmol zirconium tetrachloride, 36mL of 3.75mmol of 2-aminoterephthalic acid and 4mL of concentrated hydrochloric acid to the left chamber 1 and right chamber 2, respectively, and place the device in an oven at 80 ℃, reacted for 48h, closed the oven, and let it cool down naturally. Remove the membrane in the device, which is the pure-phase MOFs composite membrane, and soak it in N,N-dimethylformamide.

[0034] Utilize scanning electron microscope to analyze the phase-pure MOFs composite membrane that obtains in embodiment 1, obtain its scanning electron microscope picture, as figure 2 as shown, figure 2 Scanning electron micrographs of MOFs composite membranes prepared for the examples of the present invention.

[0035] For UiO-66-NH synthesized by the same me...

Embodiment 2

[0038] 2.1 Fix the commercial porous alumina base membrane with a pore size of 40-70nm in the device, check whether it leaks, and add a gasket if it leaks.

[0039] 2.2 Add 40mL of 0.54mmol zirconium tetrachloride, 36mL of 0.75mmol of 2-aminoterephthalic acid and 4mL of concentrated hydrochloric acid to the left chamber 1 and right chamber 2 respectively, place the device in an oven, and heat it at 100 ℃, reacted for 48h, closed the oven, and let it cool down naturally. Remove the membrane in the device, that is, the pure-phase MOFs composite membrane, and soak it in N,N-dimethylformamide.

[0040] exist Figure 5 In the electrodialysis device shown, the performance of the pure-phase MOFs separation membrane for separating divalent ions was tested, and the test was carried out in a constant current mode with a current of 0.01A. The results show that the pure-phase MOFs composite membrane obtained in Example 1 has a selectivity of 95.84 for the separation of sodium and magnes...

Embodiment 3

[0042] 3.1 Fix the commercial polytetrafluoroethylene-based membrane with a pore size of 100nm in the device, check whether it leaks, and add a gasket if it leaks.

[0043] 3.2 Add 40mL of 2.7mmol zirconium tetrachloride, 36mL of 3.75mmol of 2-aminoterephthalic acid and 4mL of concentrated hydrochloric acid to the left chamber 1 and right chamber 2, respectively, and place the device in an oven at 80 ℃, reacted for 24h, closed the oven, and let it cool down naturally. Remove the membrane in the device, that is, the pure-phase MOFs composite membrane, and soak it in N,N-dimethylformamide.

[0044] exist Figure 5 In the electrodialysis device shown, the performance of the pure-phase MOFs separation membrane for separating divalent ions was tested, and the test was carried out in a constant current mode with a current of 0.01A. The results show that the pure-phase MOFs composite membrane obtained in Example 1 has a selectivity of 90.96 for sodium and magnesium ions, and a sele...

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Abstract

The invention provides an MOFs compound film which comprises a porous support film and UiO-66 series films growing on the porous support film through an anti-diffusion process. The invention also provides a preparation method and application thereof. According to the invention, a metallic salt solution and a ligand solution are utilized to reversely diffuse and grow uniform ultrathin pure UiO-66 series films on a base film under a relative mild condition, and meanwhile, acid is added on the side of the ligand solution so as to promote the formation of a metallic zirconium cluster, the metallic salt solution and the ligand solution are separated by an intermediate base film, the crystal in a main body solution can be reduced, a reactant is recovered and the MOFs and the base film are relatively firmly combined with each other and cannot fall off easily. Besides, the inherent cellular structure of the pure phase MOFs film can separate the ions such as lithium ions / magnesium ions and sodium ions / magnesium ions under the effect of aperture sieving, can promote the separation selectivity of monovalent and divalent ions and can supply a precedent condition for ion separation.

Description

technical field [0001] The invention belongs to the technical field of composite membranes, and in particular relates to a MOFs composite membrane, its preparation method and its application. Background technique [0002] In recent years, the membranes used in special separation fields such as comprehensive utilization of seawater resources, hydrometallurgy, and water treatment are basically ion-exchange membranes, which require the ability of ion-exchange membranes to selectively separate ions of different valence states. For example, when electrodialysis concentrates seawater to produce sodium chloride, Na + / Ca 2+ / Mg 2+ separation and Cl - / CO 3 2- / SO 4 2- Li + / Mg 2 + Separation of H + / M m+ (M=Cu, Al, Fe, Zn...) separation, Na + / Ca 2+ separation etc. This puts forward higher requirements for traditional ion exchange membranes: the ability to selectively pass through monovalent ions. Although the prior art discloses a variety of ion exchange membranes ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/06B01D67/00C02F1/44C02F101/10
CPCB01D69/12B01D67/0002B01D71/06C02F1/44C02F2101/10
Inventor 徐铜文徐婷婷葛亮伍斌
Owner UNIV OF SCI & TECH OF CHINA
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