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A preparation method of pim-1@mofs/polymer composite pervaporation membrane

A PIM-1, pervaporation membrane technology, applied in the field of preparation of PIM-1@MOFs/polymer composite pervaporation membrane, can solve the problems of limited application, not MOF agglomeration, etc., achieve increased separation performance, simple preparation method, The effect of increasing hydrophobic properties

Active Publication Date: 2021-10-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the easy agglomeration of MOF nanoparticles also limits its application.
So far, there have been many methods to improve the dispersion of MOF in polymer matrices, including pre-polymerization of polymer solution, ultrasonic probe ultrasound, etc., but due to the strong interaction between nanoparticles during the drying process of MOF However, none of these methods are effective enough to prevent MOF agglomeration

Method used

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  • A preparation method of pim-1@mofs/polymer composite pervaporation membrane
  • A preparation method of pim-1@mofs/polymer composite pervaporation membrane
  • A preparation method of pim-1@mofs/polymer composite pervaporation membrane

Examples

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Effect test

example 1

[0028](1) Weigh 0.75g of zinc nitrate hexahydrate and 1.65g of 2-methylimidazole and dissolve them in 35mL of methanol respectively, and ultrasonicate for 30min; quickly pour the resulting solution into a 100mL polytetrafluoroethylene reactor, and react at 150°C for 5h, Then cool to room temperature, centrifuge, wash off the white solid surface obtained by the reaction with methanol, which is the ligand of the reaction, wash it three times, centrifuge, and then stir it in methanol at 80°C for 12h, and replace it every 4 hours Methanol was separated by centrifugation, and the resulting solid was vacuum-dried at 80°C for 24 hours.

[0029] (2) Weigh 0.15g of PIM-1 and dissolve it in 5mL of chloroform, and ultrasonicate for 1 hour; weigh 0.0382g of the solid obtained in step 1 and soak in the above solution for 10min, centrifuge to separate ZIF-8, and dry it at room temperature. Wash the soaked ZIF-8 with chloroform for 3 times, then wash with methanol for 3 times, and dry it for...

example 2

[0033] (1) Weigh 0.75g of zinc nitrate hexahydrate and 1.65g of 2-methylimidazole and dissolve them in 35mL of methanol respectively, and ultrasonicate for 30min; quickly pour the resulting solution into a 100mL polytetrafluoroethylene reactor, and react at 150°C for 5h, Then cool to room temperature, centrifuge, wash off the white solid surface obtained by the reaction with methanol, which is the ligand of the reaction, wash it three times, centrifuge, and then stir it in methanol at 80°C for 12h, and replace it every 4 hours Methanol was separated by centrifugation, and the resulting solid was vacuum-dried at 80°C for 24 hours.

[0034] (2) Weigh 0.15g of PIM-1 and dissolve it in 5mL of chloroform, and ultrasonicate for 1 hour; weigh 0.0764g of the solid obtained in step 1 and soak in the above solution for 10min, centrifuge to separate ZIF-8, and dry it at room temperature. Wash the soaked ZIF-8 with chloroform for 3 times, then wash with methanol for 3 times, and dry it fo...

example 3

[0038] (1) Weigh 0.75g of zinc nitrate hexahydrate and 1.65g of 2-methylimidazole and dissolve them in 35mL of methanol respectively, and ultrasonicate for 30min; quickly pour the resulting solution into a 100mL polytetrafluoroethylene reactor, and react at 150°C for 5h, Then cool to room temperature, centrifuge, wash off the white solid surface obtained by the reaction with methanol, which is the ligand of the reaction, wash it three times, centrifuge, and then stir it in methanol at 80°C for 12h, and replace it every 4 hours Methanol was separated by centrifugation, and the resulting solid was vacuum-dried at 80°C for 24 hours.

[0039] (2) Weigh 0.15g of PIM-1 and dissolve it in 5mL of chloroform, and ultrasonicate for 1 hour; weigh 0.0115g of the solid obtained in step 1 and soak in the above solution for 10min, centrifuge to separate ZIF-8, and dry it at room temperature. Wash the soaked ZIF-8 with chloroform for 3 times, then wash with methanol for 3 times, and dry it fo...

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Abstract

The invention discloses a preparation method of PIM-1@MOFs / polymer defect-free composite pervaporation membrane: using zinc nitrate hexahydrate and 2-methylimidazole as raw materials, respectively dissolving them in methanol, and then mixing the obtained solutions , and react at 120-150°C for 3-8 hours to obtain MOF powder; immerse the MOF powder in its own microporous polymer solution, and centrifuge to obtain the processed MOF powder; dissolve the high molecular weight polymer In organic solvent B, add cross-linking agent, catalyst and processed MOF powder to obtain PIM-1@MOF / polymer mixed solution; use the ultrafiltration porous membrane of high molecular polymer as the bottom membrane, and the obtained PIM ‑1@MOF / polymer mixed solution is evenly dipped and coated on the base film to obtain PIM‑1@MOF / polymer composite membrane. The membrane prepared by the invention can improve the hydrophobicity of the original membrane, and can reduce the interface defects between the MOFs and the polymer, thereby improving the permeation flux and the separation effect of the membrane. The preparation method of the invention is simple, easy to implement, low in price and has wide application prospects.

Description

(1) Technical field [0001] The invention relates to the preparation of ultra-thin hybrid membranes and its technical field in the separation of alcohol and water, in particular to a preparation method of a PIM-1@MOFs / polymer composite pervaporation membrane. (2) Background technology [0002] Pervaporation is a membrane separation technology that combines membrane permeation and evaporation for the selective separation of liquid molecular mixtures. The general process of pervaporation consists of the following steps: (1) A liquid mixture flows through the upstream side of a membrane. (2) Components in the feed pass through the membrane driven by a chemical potential difference, which can be obtained downstream of the membrane by vacuuming, gas sweeping, or thermal differential. (3) Steam seeps out from the downstream of the membrane. The mass transfer process in pervaporation membranes is generally described by solution diffusion mechanism and facilitated transport mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/70B01D61/36B01D69/12B01D67/00
CPCB01D61/362B01D67/0002B01D69/12B01D71/34B01D71/70B01D2323/30B01D2325/38
Inventor 张国亮程浩峰张旭苏鹏程孟琴
Owner ZHEJIANG UNIV OF TECH