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Nanofiber/MOFs-based ethanol-permselective pervaporation membrane and preparation method thereof

A pervaporation membrane and nanofiber technology, applied in the field of membrane separation, can solve the problems of pervaporation performance improvement, easy agglomeration, and limited load capacity, and achieve high production efficiency, low raw material cost, and increased load capacity.

Active Publication Date: 2021-04-30
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a nanofiber / MOFs-based mixed matrix pervaporation membrane with alcohol-preferential permeation type and its preparation method, so as to solve the problem of the relatively large loading of MOFs nanoparticles in the prior art. Poor compatibility in the polymer matrix, prone to agglomeration, limited load capacity and improved pervaporation performance and other key issues

Method used

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  • Nanofiber/MOFs-based ethanol-permselective pervaporation membrane and preparation method thereof
  • Nanofiber/MOFs-based ethanol-permselective pervaporation membrane and preparation method thereof
  • Nanofiber/MOFs-based ethanol-permselective pervaporation membrane and preparation method thereof

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Embodiment 1

[0033] Embodiment 1: Kevlar yarn is cut into small sections of about 5mm, 5g Kevlar yarn small sections, 200ml dimethyl sulfoxide, 7.5g KOH, 8mL deionized water are successively added in a 400mL beaker, magnetic stirring (600rpm ) 10h to completely dissociate the Kevlar yarn, and centrifuge to remove excess KOH particles to obtain reddish-brown Kevlar nanofiber casting solution ( figure 1 ); Pour the configured casting solution on the smooth side of the glass plate, scrape it evenly and quickly from the bottom line to the top line with a glass rod, then quickly immerse the glass plate in the coagulation bath water, and obtain Kevlar fiber hydrogel membrane ( figure 2 ), then transfer it to deionized water and dialyze for 72h to remove the residual dimethyl sulfoxide in the fibrous hydrogel membrane, so as to avoid affecting the subsequent freeze-drying effect because of its low vapor pressure and difficulty in volatilization.

[0034] The above-mentioned Kevlar fiber hydroge...

Embodiment 2

[0037] Embodiment 2: according to the operation of embodiment 1, wherein, the concentration of the methanol solution of zinc nitrate hexahydrate is increased to 30mg / ml, the concentration of the methanol solution of 2-methylimidazole is increased to 66mg / ml and shaken, and ZIF-8 is obtained @Kevlar hybrid airgel membrane, the loading of ZIF-8 is calculated to be 47wt% by weighing method.

[0038] Add 3% of free radical photoinitiator 2-hydroxy-2-methyl-1-phenylacetone into the acrylate functionalized polysiloxane, and stir evenly to obtain a mixed solution of polysiloxane. Immerse the ZIF-8@Kevlar airgel in the mixed solution of polysiloxane at room temperature for 45 minutes, and absorb and remove the excess polysiloxane solution on the surface after fully soaking. The distance between the UV light source and the film was controlled to be 12 cm, and photopolymerization was carried out for 35 s under a UV light with a power of 220 w and a wavelength of 365 nm to obtain a ZIF-8...

Embodiment 3

[0040] Embodiment 3: According to the operation of embodiment 1, wherein, only the concentration of the methanol solution of zinc nitrate hexahydrate is increased to 50 mg / ml, and the concentration of the methanol solution of 2-methylimidazole is increased to 110 mg / ml for shaking. The loading of ZIF-8 was calculated by weighing method to be 63wt%. The prepared ZIF-8@Kevlar / PDMS mixed matrix membrane was used for the pervaporation separation of butanol aqueous solution. When the feed liquid temperature was 45°C, butanol When the alcohol concentration is 1.0wt%, the separation factor is 56, and the permeation flux is 1894g / m 2 h.

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Abstract

The invention relates to a preparation method of a nanofiber / MOFs-based ethanol-permselective pervaporation membrane, belonging to the technical field of membrane separation. The preparation method comprises the following steps: loading MOFs on a nanofiber hydrogel membrane skeleton in situ to obtain a nanofiber / MOFs composite hydrogel membrane with uniformly dispersed MOFs particles, then carrying out vacuum freezing-drying to obtain a nanofiber / MOFs hybrid aerogel membrane; and backfilling the network of the aerogel membrane with a polymer matrix, and carrying out cross-linking and curing to obtain the nanofiber / MOFs-based ethanol-permselective pervaporation membrane with high loading capacity and uniformly distributed MOFs. The strategy that MOFs particles are uniformly loaded on the porous fiber hydrogel skeleton in advance and serve as composite network filler of the pervaporation membrane and then the polymer matrix is backfilled and cured is put forward for the first time, so uniform dispersion of the high-load MOFs particles in the polymer matrix can be effectively realized; and the obtained mixed matrix membrane has excellent mechanical properties and efficient pervaporation performance, and has good application prospects in the aspect of separation of biological alcohol mixed systems such as ethanol / butanol.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a nanofiber / MOFs-based pervaporation membrane with alcohol-preferential permeation and a preparation method thereof. Background technique [0002] With the increasing problems of global warming (greenhouse effect) and energy security caused by traditional fossil energy, biofuels are becoming more and more popular. As a new type of biofuel, biobutanol has the advantages of high calorific value, low volatility, and can be mixed with gasoline in any proportion. It is considered to be a favorable substitute for traditional fossil fuels. Currently, fermentation is considered to be the most promising technology for biobutanol production. Nevertheless, there are some significant problems in the production of butanol by biological fermentation, such as the inhibition of butanol product, which will lead to low product concentration and yield, and the low concentra...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D67/00B01D69/14B01D71/70
CPCB01D61/362B01D71/70B01D67/0006B01D69/141Y02E50/10
Inventor 张广法闫业海鹿丽崔健高爱林赵帅周楷嵘张跃康初浩展
Owner QINGDAO UNIV OF SCI & TECH
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