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MOF (metal organic framework) modified nanofiltration/reverse osmosis membrane and application thereof

A metal-organic framework and reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, permeation/dialysis water/sewage treatment, etc., can solve the problem of uneven dispersion of metal-organic framework materials, waste of metal-organic framework materials, and limited membrane Performance and other issues, to achieve the effect of easy operation, simple method and retention rate

Active Publication Date: 2019-01-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of method will waste a lot of expensive metal-organic framework materials. At the same time, the metal-organic framework materials are unevenly dispersed and easy to agglomerate, which greatly limits the further improvement of membrane performance.

Method used

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  • MOF (metal organic framework) modified nanofiltration/reverse osmosis membrane and application thereof
  • MOF (metal organic framework) modified nanofiltration/reverse osmosis membrane and application thereof
  • MOF (metal organic framework) modified nanofiltration/reverse osmosis membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of UiO-66 / TFN Nanofiltration Membrane

[0028] (1) Add 3.87g of polyvinylidene fluoride into 20mL of N,N-dimethylformamide, stir to dissolve, let it stand for defoaming, and form a stable and uniform casting solution. Use a spatula to scrape and coat the casting solution on a glass plate, and quickly put it into a deionized water coagulation bath. After the phase inversion is complete, transfer the polyvinylidene fluoride support layer to new deionized water to continue solvent exchange for 24 hours.

[0029] (2) ZrCl 2 (0.105g) and terephthalic acid (0.105g) were added to the N,N-dimethylformamide / acetic acid mixture (the volumes were 75mL and 5mL respectively), stirred and dissolved, and reacted at 100°C for 36h, After cooling to room temperature, stir in methanol at 80°C for 24 hours, centrifuge and dry to obtain UiO-66 crystals.

[0030] (3) Immerse the polyvinylidene fluoride support layer in 100mL Tris-HCl (pH=7.0) buffer solution containin...

Embodiment 2

[0033] Embodiment 2 prepares UiO-66 / TFN reverse osmosis membrane

[0034](1) Add 2.28g of polyimide into 20mL of N-methylpyrrolidone, stir to dissolve and defoam after standing to form a stable and uniform casting solution. Use a scraper to scrape the casting liquid onto the glass plate, and then quickly put it into the deionized water coagulation bath. After the phase inversion is complete, transfer the polysulfone support layer to new deionized water to continue the solvent exchange for 12 hours.

[0035] (2) ZrCl 2 (0.105g) and terephthalic acid (0.105g) were added to the N,N-dimethylformamide / acetic acid mixture (the volumes were 75mL and 5mL respectively), stirred and dissolved, and reacted at 100°C for 36h, After cooling to room temperature, it was stirred in methanol at 80°C for 24 h, and dried after ionization to obtain UiO-66 crystals.

[0036] (3) Immerse the polyimide support layer in 100mL Tris-HCl (pH=7.0) buffer solution containing 0.1g catechol, shake and reac...

Embodiment 3

[0039] Embodiment 3 prepares IRMOF-3 / TFN nanofiltration membrane

[0040] (1) Add 8.09g of polyvinylidene fluoride into 20mL of N,N-dimethylformamide, stir to dissolve, and let it stand for defoaming to form a stable and uniform casting solution. Use a spatula to scrape and coat the casting solution on a glass plate, and quickly put it into a deionized water coagulation bath. After the phase inversion is complete, transfer the polyvinylidene fluoride support layer to new deionized water to continue solvent exchange for 48 hours.

[0041] (2) Zn(NO 3 ) 2 ·6H 2 O (0.4462g) and 2-aminoterephthalic acid (0.0906g) were added to N,N-dimethylformamide (50mL), stirred and dissolved, reacted at 100°C for 24h, cooled to room temperature, and used N,N-dimethylformamide and dichloromethane were washed alternately, and then dried in vacuum at 60°C to obtain IRMOF-3 crystals.

[0042] (3) Immerse the polyvinylidene fluoride support layer in 100mL Tris-HCl (pH=7.0) buffer solution contai...

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PUM

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Abstract

The invention discloses preparation and an application of an MOF (metal organic framework) modified nanofiltration / reverse osmosis membrane and belongs to the technical field of preparation of water treatment membranes. Firstly, a dopamine bio-inspired material is subjected to an auto-agglutination reaction to uniformly coat the surface of a polymer support layer, then, MOF is assembled on the surface of the porous support layer in advance through a Michael addition reaction or a Schiff base reaction between MOF and the coating layer, and then, an interface polymerization reaction is conducted, so that the MOF material is embedded in a PA (polyamide) active layer. The preparation and the application have the advantages that the problems that the MOF is mixed in water phases or organic phases traditionally and MOF is not uniformly dispersed in the PA layer are solved, and meanwhile, the dosage of the MOF can be greatly reduced. The retention rate is well kept while the membrane flux ofthe prepared MOF modified nanofiltration / reverse osmosis membrane is improved. The method is simple and easy to operate and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of water treatment membranes, and in particular relates to metal organic framework modified nanofiltration / reverse osmosis membranes and their preparation and application. Background technique [0002] Both nanofiltration and reverse osmosis are pressure-driven membranes. Compared with traditional thermal desalination technology, they have the advantages of no phase change in the separation process, high separation efficiency, small footprint, and simple operation. At present, commercial nanofiltration and reverse osmosis membranes are mostly composite membranes, which usually consist of three parts: non-woven reinforcement layer, polymer support layer and polyamide separation layer. Interfacial polymerization is a common method for preparing composite nanofiltration / reverse osmosis membranes, which has the advantages of simple operation, easy control, and scalability. However, this composite membrane still...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/10B01D71/56C02F1/44
CPCB01D61/025B01D61/027B01D67/0006B01D69/10B01D71/56C02F1/441C02F1/442
Inventor 张国亮张旭徐泽海孟琴
Owner ZHEJIANG UNIV OF TECH
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