ZIF-8/PDMS mixed matrix pervaporation membrane as well as preparation method and application thereof

A technology of ZIF-8 and pervaporation membrane, which is applied in the field of membrane separation, can solve problems such as uneven distribution, and achieve the effect of easy aggregation, simple steps, and mild reaction conditions

Active Publication Date: 2021-09-07
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: the technical problem to be solved by the present invention is to provide a method for preparing ZIF-8 / PDMS mixed matrix pervaporation membrane to solve the problem of uneven distribution of ZIF-8 on PDMS organic membrane

Method used

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  • ZIF-8/PDMS mixed matrix pervaporation membrane as well as preparation method and application thereof
  • ZIF-8/PDMS mixed matrix pervaporation membrane as well as preparation method and application thereof
  • ZIF-8/PDMS mixed matrix pervaporation membrane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of ZIF-8 / PDMS mixed matrix pervaporation membrane:

[0034] (1) 0.7333g Zn(NO 3 ) 2 ·6H 2 O and 1.6223g 2-methylimidazole (Hmin) were dissolved in 50ml methanol respectively, and the two solutions were put into an ultrasonic cleaner to disperse for 10min to ensure that Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were evenly dispersed in methanol, and then the two solutions were poured into a 100ml beaker at the same time, and after standing for 30 minutes, a ZIF-8 suspension solution was obtained, which was suction-filtered on a PVDF membrane and placed in a vacuum drying oven. Dry overnight at 60°C to obtain PVDF membrane I pre-seeded with ZIF-8.

[0035] (2) Using the diffusion method, 1.4666g Zn(NO 3 ) 2 ·6H 2 O and 3.2446g 2-methylimidazole (Hmin) are dissolved in respectively in the 100ml methyl alcohol, two kinds of solutions are put into ultrasonic cleaner and disperse 10min to ensure that Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were unifor...

Embodiment 2

[0038] Preparation of PDMS / ZIF-8 / PVDF pervaporation membrane:

[0039] (1) Dissolve 0.7333g Zn(NO3)2·6H2O and 1.6223g 2-methylimidazole (Hmin) in 50ml methanol respectively, and put the two solutions into an ultrasonic cleaner to disperse for 10min to ensure that Zn(NO3) 3 ) 2 ·6H 2 O and 2-methylimidazole were evenly dispersed in methanol, and then the two solutions were poured into a 100ml beaker at the same time, and after standing for 30 minutes, a ZIF-8 suspension solution was obtained, which was suction-filtered on a PVDF membrane and placed in a vacuum drying oven. Dry overnight at 60°C to obtain PVDF membrane I pre-seeded with ZIF-8.

[0040] (2) Using the diffusion method, 1.4666g Zn(NO 3 ) 2 ·6H 2 O and 3.2446g 2-methylimidazole (Hmin) are dissolved in respectively in the 100ml methyl alcohol, two kinds of solutions are put into ultrasonic cleaner and disperse 10min to ensure that Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were uniformly dispersed in methanol, a...

Embodiment 3

[0043] Preparation of PDMS / ZIF-8 / PVDF pervaporation membrane:

[0044] (1) 0.7333g Zn(NO 3 ) 2 ·6H 2 O and 1.6223g 2-methylimidazole (Hmin) were dissolved in 50ml methanol respectively, and two kinds of solutions were put into ultrasonic cleaner to disperse 10min to ensure that Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were evenly dispersed in methanol, and then the two solutions were poured into a 100ml beaker at the same time, and after standing for 30 minutes, a ZIF-8 suspension solution was obtained, which was suction-filtered on a PVDF membrane and placed in a vacuum drying oven. Dry overnight at 60°C to obtain PVDF membrane I pre-seeded with ZIF-8.

[0045] (2) Using the diffusion method, 1.4666g Zn(NO 3 ) 2 ·6H 2 O and 3.2446g 2-methylimidazole (Hmin) are dissolved in respectively in the 100ml methyl alcohol, two kinds of solutions are put into ultrasonic cleaner and disperse 10min to ensure that Zn(NO 3 ) 2 ·6H 2 O and 2-methylimidazole were uniformly disper...

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Abstract

The invention discloses a ZIF-8 / PDMS mixed matrix pervaporation membrane as well as a preparation method and application thereof. The preparation method comprises the following steps of dissolving zinc nitrate hexahydrate and 2-methylimidazole in a solvent, uniformly mixing, and standing to obtain a ZIF-8 precursor solution, penetrating through a PVDF membrane through a suction filtration method to obtain a PVDF membrane I with preset ZIF-8 seed crystals, placing a zinc nitrate hexahydrate solution and a 2-methylimidazole solution on the two sides of the PVDF membrane with the preset ZIF-8 seed crystal respectively through a diffusion method for diffusion crystallization, then taking out the membrane, washing and drying, and acquiring a PVDF substrate membrane II with ZIF-8 crystals, mixing PDMS and a cross-linking agent to obtain a suspension liquid, then adding dibutyltin dilaurate into the suspension liquid, and stirring the mixture to be uniform to obtain a membrane coating liquid, and uniformly coating the PVDF substrate membrane II with the ZIF-8 crystals with the membrane coating liquid, cross-linking at normal temperature, and drying to obtain the PVDF / ZIF-8 composite membrane. The ZIF-8 is loaded on the surface and in pore channels of the PVDF membrane by using a preset seed crystal-pair diffusion growth method, and the PVDF membrane is coated with PDMS to prepare a sandwich structure, so that the problem that the ZIF-8 is easy to aggregate in the PDMS membrane is solved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a ZIF-8 / PDMS mixed matrix pervaporation membrane and a preparation method and application thereof. Background technique [0002] Pervaporation (PV) is a new type of membrane separation technology based on separation materials. It is characterized in that it uses the characteristics of materials to achieve material separation. The dissolution and diffusion of substances in materials are realized by the process. theoretical basis. PV technology has the advantages of mild separation conditions, no thermal damage to heat-sensitive aromatics, low energy consumption, no need for additional treatment and addition of solvents or adsorbents, and continuous operation. It has great potential in chemical, energy, environment, medicine, food and other fields Broad application prospects. [0003] According to different separation systems, pervaporation membranes can b...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/70B01D69/02B01D67/00B01D61/36
CPCB01D71/82B01D71/70B01D69/02B01D67/0088B01D67/0081B01D61/362
Inventor 姚忠李睿李佳玮杨冬伊孙芸朱本伟
Owner NANJING UNIV OF TECH
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