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Mixed matrix membrane containing imidazolate metal-organic framework material and its preparation and application

A technology of imidazolate metal and mixed matrix membrane, which is applied in the field of membrane separation, can solve the problem of low compatibility between particle agglomeration and polymer phases, and achieve the effect of improving membrane separation performance, good compatibility, and improving separation performance

Inactive Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention solves the technical problems of particle agglomeration and low compatibility with polymer phases in the mixed matrix membrane in the prior art

Method used

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preparation example Construction

[0037] The invention provides a method for preparing a mixed matrix film containing imidazole ester metal organic framework material, which comprises the following steps:

[0038] S1: Mix the N,N-dimethylformamide (DMF) solution of the imidazole ligand containing the aldehyde group with the DMF solution of zinc acetate, stir and react for a period of time at room temperature, centrifuge and freeze dry;

[0039] S2: Put the freeze-dried imidazole metal organic framework material (ZIF-OH) containing aldehyde group into a methanol flask, add the reducing agent and reflux for a period of time at 60°C, and centrifuge to obtain imidazole metal containing hydroxyl group The organic framework material (ZIF-CHO) material is redispersed in methanol solution for use;

[0040] S3: Mix the methanol dispersion liquid of the imidazole ester metal organic framework material (ZIF-CHO) containing hydroxyl, polydimethylsiloxane (PDMS), crosslinking agent and catalyst raw materials to form a casting liq...

Embodiment 1

[0052] In a 250mL round bottom flask, add a solution of 0.845g imidazole-2-formaldehyde in 50mL DMF, then add 0.964g zinc acetate, stir at 65°C for 60min, centrifuge, wash with methanol several times, freeze-dry 1 day. The initial measurement ratio of the whole reaction n(Zn 2+ The molar ratio of ):n (imidazole-2-carboxaldehyde) is 1:2, and the product ZIF-90 is finally obtained.

[0053] Weigh 1.2g of synthesized ZIF-90 into the flask, then add 50ml of methanol and stir at 60℃ for 1 hour. After the suspension is uniform, add 0.6g of sodium borohydride, continue to stir for 24 hours and centrifuge to obtain the product ZIF-91 , Re-disperse in methanol solution for later use.

[0054] The raw materials containing ZIF-91 nanoparticles, polydimethylsiloxane (PDMS), crosslinking agent, and catalyst are mixed in a mass ratio of 1:10:1:0.05 to form a casting liquid, and after stirring, vacuum degassing 2h, finally pour the casting solution on the prepared PVDF base film, scrape the fil...

Embodiment 2

[0056] In a 250 mL round bottom flask, add 0.845 g imidazole-5-formaldehyde in 50 mL DMF solution, then add 1.308 g zinc nitrate dissolved in it, stir at 65°C for 60 min, centrifuge, wash several times with methanol, freeze dry 1 day. The initial measurement ratio of the whole reaction n(Zn 2+ The molar ratio of ):n (imidazole-5-carboxaldehyde) is 1:3, and the product ZIF-CHO is finally obtained.

[0057] Weigh 1.2g of synthesized ZIF-CHO into the flask, then add 50ml of methanol and stir at 60℃ for 1 hour, add 0.6g of potassium borohydride after the suspension is uniform, continue stirring for 24h, and centrifuge to obtain the product ZIF-OH , Re-disperse in methanol solution for later use.

[0058] The raw materials containing ZIF-OH nanoparticles, polymethylphenylsiloxane (PMPS), cross-linking agent, and catalyst are mixed in a mass ratio of 2:10:1:0.05 to form a casting solution. After stirring, it is vacuumed off. Soak for 2h, and finally pour the casting solution on the fin...

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Abstract

The invention discloses a mixed matrix membrane containing an imidazole ester metal organic skeleton material, preparation and applications thereof, and belongs to the field of membrane separation. The preparation method comprises: reducing an imidazole ester metal organic skeleton material containing an aldehyde group to obtain a hydroxyl group-containing imidazole ester metal organic skeleton material; mixing the hydroxyl group-containing imidazole ester metal organic skeleton material, a hydrophobic organic polymer, a cross-linking agent and a catalyst to cross-linking the hydrophobic organic polymer into a network structure, and linking the hydroxyl group-containing imidazole ester metal organic skeleton material to the network structure through hydrogen bonding force to obtain a filmcasting liquid; and cross-linking the film casting liquid on a base membrane to obtain the mixed matrix film. According to the present invention, the problems of poor dispersibility of the imidazole ester metal organic skeleton material and poor phase compatibility with polymers are solved, and the separation performance of the mixed matrix membrane is improved.

Description

Technical field [0001] The invention belongs to the field of membrane separation, and specifically relates to a mixed matrix membrane containing imidazole ester metal-organic framework materials, as well as preparation and application. Background technique [0002] Pervaporation technology is used for the separation of liquid mixtures. Its outstanding advantage is that it can achieve separation tasks that are difficult to complete by traditional methods such as distillation, extraction, and absorption with lower energy consumption. It is particularly suitable for the separation of near-boiling point, constant-boiling point mixtures and isomers that are difficult or impossible to separate by distillation; it has obvious advantages in the removal of trace water in organic solvents and mixed solvents and the separation of small amounts of organic pollutants in wastewater. Technical and economic advantages. Therefore, pervaporation technology has broad application prospects and mark...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/10B01D61/36
CPCB01D61/362B01D67/0011B01D67/0013B01D67/0079B01D67/0088B01D69/105B01D69/125B01D69/148B01D2323/30B01D2323/46
Inventor 王艳潘勇
Owner HUAZHONG UNIV OF SCI & TECH