Preparation method of polymer-based metal organic framework hybrid membrane

An organic framework and polymer technology, applied in the field of preparation of polymer-based metal-organic framework hybrid membranes, can solve the problems of low flux and low rejection rate, achieve high porosity and specific surface area, and the preparation method is simple and easy , easy-to-magnify effect

Inactive Publication Date: 2017-06-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to invent a polymer-based metal-organic framework hybrid with simple preparation process and high flux and selectivity for the existing composite nanofiltration membranes, or the problems of low flux or low rejection rate. membrane

Method used

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  • Preparation method of polymer-based metal organic framework hybrid membrane
  • Preparation method of polymer-based metal organic framework hybrid membrane
  • Preparation method of polymer-based metal organic framework hybrid membrane

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0042] The first step is to immerse the polyacrylonitrile-based membrane in a 2mol / L sodium hydroxide solution and hydrolyze it at 65°C for 1 hour. The hydrolysis reaction occurs in the polyacrylonitrile, and the nitrile group is converted into a carboxyl group, making the membrane surface negatively charged;

[0043] In the second step, the hydrolyzed polyacrylonitrile (HPAN) obtained in step one is repeatedly rinsed with deionized water, and then the obtained HPAN membrane is immersed in deionized water for 24 hours;

[0044] In the third step, configure 0.2mol / L zinc nitrate (Zn(NO 3 ) 2 ) aqueous solution, and 0.4wt.% polyethyleneimine (PEI) aqueous solution, and the two are mixed in equal volumes to form a water phase solution; configure 0.2mol / L 2-methylimidazole / n-hexane solution as an oil phase solution ;

[0045] In the fourth step, the HPAN film obtained in step two is immersed in the Zn(NO 3 ) 2 and PEI mixed aqueous solution for 1h, Zn 2+ Chelate with cationic...

Embodiment 2

[0052] The interface reaction time of step 6 in embodiment 1 is adjusted to 60min, all the other conditions are the same as embodiment 1. The prepared MOFs hybrid membrane nanofiltration membrane is used for cross-flow filtration of 100mg / L Congo red aqueous solution, and the permeation flux is 450.8L m -2 h -1 ·MPa -1 , The rejection rate is 99.5%.

Embodiment 3

[0054] Zn(NO 3 ) 2 The water solubility concentration is adjusted to 0.25mol / L, and the concentration of the 2-methylimidazole / n-hexane solution is adjusted to 0.25mol / L; other conditions are the same as in Example 1. The prepared MOFs hybrid membrane nanofiltration membrane is used for cross-flow filtration of 100mg / L Congo red aqueous solution, and the permeation flux is 750.8L m -2 h -1 ·MPa -1 , The rejection rate is 99.8%.

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Abstract

The invention provides a preparation method of a polymer-based metal organic framework hybrid membrane and belongs to the technical field of membrane separation. The method comprises the following steps: pre-treating a polymer-based membrane so that the surface of the polymer-based membrane has negative electricity; then immersing the modified membrane into a water solution of metal ions with positive electricity and polymer cations, enabling the metal ions and a polymer to be subjected to a chelating effect and assembling on the surface of the polymer membrane through electrostatic attraction; immersing the membrane with the surface assembled with the metal ions and the cation polymer into an oil phase solution of an organic ligand; carrying out an interface reaction for 10min-120min to grow an MOFs (Metal-organic Frameworks) crystal on the surface of the membrane in situ; and washing and drying to obtain the polymer-based metal organic framework hybrid membrane. The invention provides the novel preparation method of the polymer-based metal organic framework hybrid membrane; the method has the advantages of moderate preparation conditions, simplicity and feasibility, easy amplification and the like; and the prepared membrane is used for removing dyestuff and has a good separation performance and a wide application prospect.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a preparation method of a polymer-based metal-organic framework hybrid membrane. [0002] technical background [0003] Due to the advantages of energy saving, environmental protection, small footprint and high separation efficiency, membrane separation technology has received extensive attention and research in recent years. The separation precision of nanofiltration membrane is between ultrafiltration and reverse osmosis, and the separation scale is in the range of 1-10nm. Nanofiltration membranes have a good separation effect on high-valent salts and low-molecular-weight organic substances, and have broad application prospects in reverse osmosis pretreatment and dye removal. [0004] Polymer nanofiltration membranes have been successfully used in the above fields due to their low cost and continuous production. However, the permeation flux and selectivity of the polymer mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D71/30B01D71/34B01D71/42B01D69/12B01D67/00
CPCB01D69/125B01D71/26B01D71/30B01D71/34B01D71/42
Inventor 王湛杨丽彬李平刘松柏
Owner BEIJING UNIV OF TECH
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