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Porous granule MCM-41-ZIF-8/PDMS pervaporation hybrid membrane, preparation and application

A technology of MCM-41-ZIF-8 and MCM-41, which is applied in the field of pervaporation preferential alcohol permeation hybrid membrane, can solve the problem of no disclosure of preferential alcohol permeation hybrid membrane and the like

Inactive Publication Date: 2014-05-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is no disclosure of MCM-41 and ZIF-8 composite / PDMS preferentially permeable hybrid membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) ①Weigh 1.0g of mesoporous molecular sieve MCM-41 and soak in 2.9g of Zn(NO 3 ) 2 ·6H 2 O in 200ml of methanol, stirred at room temperature for 10 min under vacuum, centrifuged, washed with methanol for 3 times, and this process was repeated 4 times to obtain the product ①. ② Soak the product of ① in 200ml of methanol solution containing 6.9g of 2-methylimidazole, stir at room temperature for 0.5h, centrifuge, wash with methanol for 3 times, and wash with ethanol for 3 times. ③ Disperse the product of step ② in 150ml of n-heptane, add 0.5g of 1,1,3,3-tetramethyldisilazane dropwise to the suspension, react at room temperature for 8 hours, centrifuge, wash with n-heptane for 3 times, and dry , grind and set aside.

[0026] (2) After cleaning the industrialized PSf membrane with deionized water, soak it in an ethanol / water solution with an ethanol content of 30.0wt.% for 24 hours, take it out, place it in an oven at 50°C, dry it, and place it in deionized water Soak...

Embodiment 2

[0032] (1) ①Weigh 1.0g of mesoporous molecular sieve MCM-41 and soak in 2.9g of Zn (NO 3 ) 2 ·6H 2 O in 200ml of methanol, stirred at room temperature for 30 minutes under vacuum, centrifuged, washed with methanol for 3 times, and this process was repeated 3 times to obtain the product ①. ② Soak the product ① in 200ml of methanol containing 6.9g of 2-methylimidazole, stir at room temperature for 0.5h, centrifuge, wash 3 times with methanol and 4 times with ethanol. ③ Disperse the product ② in 150ml of n-heptane, add 0.5g of 1,3-di-n-octyltetramethyldisilazane dropwise to the suspension, react at room temperature for 12h, centrifuge, wash with n-heptane 2-3 times, Dry, grind and set aside.

[0033](2) After cleaning the industrial PSf membrane with deionized water, soak it in ethanol / water solution with an ethanol content of 30.0wt.% for 12 hours, take it out, put it in an oven at 50°C, dry it, and put it in deionized water Soak for 10h and set aside.

[0034] (3) Weigh 1....

Embodiment 3

[0039] (1) ① Weigh 2.0g of mesoporous molecular sieve MCM-41 and soak in 2.9g of Zn (NO 3 ) 2 ·6H 2 O in 200ml of methanol, stirred at room temperature for 30min under vacuum, centrifuged, washed with methanol 4 times, and this process was repeated 3 times to obtain the product ①. ② Soak the product ① in 200ml of methanol containing 6.9g of 2-methylimidazole, stir at room temperature for 0.5h, centrifuge, wash 3 times with methanol and 3 times with ethanol. ③ Disperse the product ② in 150ml of n-heptane, add 2.0g of 1,1,3,3-tetramethyldisilazane dropwise to the suspension, react at room temperature for 12 hours, centrifuge, wash with n-heptane 2-3 times, Dry, grind and set aside.

[0040] (2) After cleaning the industrialized PSf membrane with deionized water, soak it in ethanol / water solution with an ethanol content of 30.0wt.% for 20h, take it out, put it in an oven at 50°C, dry it, and put it in deionized water Soak for 12h and set aside.

[0041] (3) Weigh 1.0g of PDM...

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Abstract

The invention relates to a porous granule MCM-41-ZIF-8 / PDMS pervaporation hybrid membrane, preparation and application, and belongs to the technical field of membrane separation. According to the invention, silicon hydroxyl enriched on the surface of a mesoporous molecular sieve MCM-41 is used, and a vacuum in-situ growth method is adopted to synthesize metal-organic framework material namely micropore ZIF-8 on the surface of the mesoporous molecular sieve MCM-41, so that porous granules containing mesoporous-micropore passages are prepared; silazane is adopted to further improve the hydrophobic modification of the porous granule MCM-41-ZIF-8, and the porous granule MCM-41-ZIF-8 is mixed with PDMS, then a membrane scraping method is adopted to prepare the pervaporation hybrid composite membrane on a polysulfone base membrane, the holes of which are blocked by deionized water, and the pervaporation hybrid composite membrane is used for the separation of ethyl alcohol / water system. The large aperture of MCM-41 and adsorbability of the ZIF-8 are used to promote alcohol molecules to adsorb on the surface of the membrane and to diffuse in the porous granule pore passages, and the defect of Trade-off phenomenon between separation factors and permeation flux is overcome, therefore, the separation performance of the hybrid membrane is improved. The porous granule MCM-41-ZIF-8 / PDMS pervaporation hybrid membrane has the advantages that the synthesis method of the porous granules is simple, the membrane preparation technology is simple and feasible, and a better industrial application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to the preparation and application of in-situ growth of metal organic framework material ZIF-8 on the surface of mesoporous molecular sieve MCM-41 and its pervaporation preferential alcohol permeation hybrid membrane. Background technique [0002] At present, the alcohol-preferential membrane technology is still one of the research focuses in the field of pervaporation. Due to the inevitable shortcomings of organic and inorganic membranes, the preparation of organic-inorganic hybrid membranes is the current development trend in the field of pervaporation membranes. Many scholars have blended hydrophobically modified Zeolite, Silicalite, carbon nanotubes and other inorganic particles with organic polymers to prepare hybrid membranes. Studies have found that filling inorganic particles can effectively improve the separation performance of the membrane, especiall...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/70B01D67/00B01D61/36
Inventor 纪树兰高静张蓉李建荣秦振平
Owner BEIJING UNIV OF TECH
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