Self-assembled super-molecular polymer nano-filtration membrane based on graphene and preparation method thereof

A supramolecular polymer, self-assembly technology, applied in chemical instruments and methods, membrane, membrane technology, etc., to achieve the effect of good controllability, multiple added value, and expansion of assembled materials

Inactive Publication Date: 2017-01-11
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research on applying metallosupramolecular polymers to layer-by-layer self-assembled nanofiltration membranes. The applicant of the present invention self-assembles metallosupramolecular polymers prepared by transition metals and bisleidyl oxalic acid on the surface of the base membrane. And a layer of graphene oxide is self-assembled on the outermost layer to prepare a functional nanofiltration membrane

Method used

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  • Self-assembled super-molecular polymer nano-filtration membrane based on graphene and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Add polyethyleneimine to deionized water, stir fully, add sodium chloride, and stir evenly to obtain a covalent cationic polyelectrolyte solution with a mass fraction of 0.2%, wherein the concentration of sodium chloride is 0.5M, and the pH value is 2.5.

[0031] (2) Mix the 1mmol / L zinc ion transition metal ion solution and the bis-leidyl oxalic acid solution, wherein the molar ratio of the transition metal ion to the bis-leidyl oxalic acid is 1:1, and adjust the pH value of the mixed system to 5 with a buffer , fully stirred to obtain a supramolecular polymer solution.

[0032] (3) The alkali-modified polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 30,000 is used as the base membrane, and the base membrane is fixed in a container with a porous support layer, with the membrane facing up, and then a total of valent cation polyelectrolyte solution, pressurized assembly at 0.1 MPa for 5 min, and fully washed with deionized water for 1 mi...

Embodiment 2

[0037] (1) Add polyvinylamine into deionized water, stir fully, add sodium chloride, stir evenly to obtain a covalent cationic polyelectrolyte solution with a mass fraction of 0.5%, wherein the concentration of sodium chloride is 0.5M, and the pH value is 3 .

[0038] (2) Mix 3mmol / L copper ions and cobalt ions transition metal ion solution and bisleidyl oxalic acid solution, wherein the molar ratio of transition metal ions to bisleidyl oxalic acid is 1:2, adjust the pH of the mixed system with buffer The value is 6, and the supramolecular polymer solution is obtained by stirring thoroughly.

[0039] (3) The sulfonated polyethersulfone ultrafiltration membrane with a molecular weight cut-off of 50,000 is used as the base membrane, and the base membrane is fixed in a container with a porous support layer, with the membrane facing up, and then covalent cations are added to the container The polyelectrolyte solution was pressurized and assembled at 0.8 MPa for 5 minutes, and ful...

Embodiment 3

[0044] (1) polyallyl ammonium chloride is added in deionized water, fully stirred, sodium chloride is added, stirred evenly, and the covalent cationic polyelectrolyte solution that obtains mass fraction is 0.3%, wherein the concentration of sodium chloride is 0.5M, The pH is 2.7.

[0045] (2) The iron ion of 3.5mmol / L and the lanthanum ion transition metal ion solution and the bis-leidyl oxalic acid solution are mixed, wherein the mol ratio of the transition metal ion and the bis-leidyl oxalic acid is 1:1.5, regulates the mixed system with buffer The pH value is 5.4, and the supramolecular polymer solution is obtained by thorough stirring.

[0046] (3) The alkali-modified polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 40,000 is used as the base membrane, and the base membrane is fixed in a container with a porous support layer with the membrane facing up, and then a total of Valence cationic polyelectrolyte solution, pressurized assembly at 0.5 ...

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Abstract

The invention provides a self-assembled super-molecular polymer nano-filtration membrane based on graphene and a preparation method thereof. The specific method comprises: taking a polyacrylonitrile super-filtration membrane or a sulfonated polyethersulfone super-filtration membrane which are subjected to alkali modification treatment as a base membrane and fixing the base membrane into a container with a porous supporting layer; putting a membrane surface upward; adding a covalent cationic polyelectrolyte solution and a super-molecular polymer solution into the container respectively; pressurizing and assembling; sufficiently washing with de-ionized water and repeating for a plurality of times; putting the membrane into a drying oven for carrying out heat treatment to obtain a multilayered super-molecular polymer nano-filtration membrane; finally, immersing the multilayered super-molecular polymer nano-filtration membrane into a graphene oxide solution; pressurizing and assembling; sufficiently washing with de-ionized water; putting the multilayered super-molecular polymer nano-filtration membrane into the drying oven for carrying out heat treatment to obtain the self-assembled super-molecular polymer nano-filtration membrane based on the graphene. The nano-filtration membrane prepared by the preparation method provided by the invention contains a super-molecular polymer so that the controllability of the nano-filtration membrane is improved and the separation effect is good; the preparation method is simple and efficient and does not utilize an organic solvent, so that the protection method is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of membrane separation materials, and in particular relates to a graphene-based self-assembled supramolecular polymer nanofiltration membrane and a preparation method. Background technique [0002] Membrane materials are the core of membrane separation technology. The properties of membrane materials directly affect the stability and separation effect of membrane separation. Compared with traditional membrane materials, nanofiltration membranes have high selective separation, high flux and better mechanical strength. Chemical stability, heat resistance and stain resistance properties. Nanofiltration membrane materials include cellulose, polyamide, polysulfone, and inorganic ceramics. The single-material nanofiltration membrane materials have their own advantages and disadvantages. The permeation flux of cellulose nanofiltration membranes is relatively low. Selective separation is poor, polyamide nanofiltrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D67/00B01D71/42B01D71/68
CPCB01D69/12B01D67/0079B01D69/02B01D71/42B01D71/68B01D2325/48
Inventor 李风浪李舒歆
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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