Polypeptide-modified graphene oxide-modified composite antibacterial forward osmosis membrane and preparation method thereof

A graphene modification and polypeptide modification technology, which is applied in chemical instruments and methods, semi-permeable membrane separation, permeation/dialysis water/sewage treatment, etc., can solve the problems of unstable antibacterial effect and limit practical application, and achieve improvement Antibacterial performance, prevent the spread of bacteria, and high efficiency

Inactive Publication Date: 2019-12-10
宁波蓝盾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the antibacterial effect of GO not very stable, which limits its practical application.

Method used

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Examples

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preparation example Construction

[0022] As an aspect of the technical solution of the present invention, it relates to a preparation method of a polypeptide-modified graphene oxide modified composite antibacterial forward osmosis membrane, which includes:

[0023] (1) mix the aqueous solution containing the solvent and the silane coupling agent, then backlight hydrolyze, and then add graphene oxide to react to obtain alkynylated graphene oxide;

[0024] (2) Modifying polypeptides on the surface of alkynylated graphene oxide by click chemistry technology to obtain polypeptide-modified graphene oxide;

[0025] (3) Mix the polypeptide-modified graphene oxide, high molecular polymer and solvent evenly, and then apply the liquid phase inversion method to coat the membrane to obtain the polypeptide-modified graphene oxide-modified composite antibacterial forward osmosis membrane.

[0026] In some preferred embodiments of the present invention, step (1) specifically includes: uniformly mixing the aqueous solution co...

Embodiment 1

[0054] Prepare an aqueous ethanol solution with a concentration of 80%, adjust its pH to 4 with hydrochloric acid, add 0.5 mmol of vinyltrimethoxysilane, hydrolyze against the light at 20°C for 2 hours, add 3 mmol of GO prepared by the Hummer method into the hydrolyzed solution, and disperse by ultrasonic 2h. Then put it on a shaker at 30° C. for 5 h. After the reaction, methanol was added and centrifuged for 10 times to obtain alkynylated graphene oxide. Ultrasonic dispersion of 5 g of the prepared alkynylated graphene oxide was carried out in a three-necked flask filled with 100 ml of ethanol, and then 0.2 μmol CuSO 4 solution, 1 μmol tris(3-hydroxypropyltriazolylmethyl)amine solution, 10 μmol RGD-PEG-N3 solution and 0.2 mmol sodium ascorbate (AA) solution, vacuumize, react in the dark at 20°C under nitrogen protection for 5 hours, and then The reacted solution was centrifuged and washed with ethanol for 10 times, and then vacuum-dried to obtain a polypeptide-modified graph...

Embodiment 2

[0057] Prepare an aqueous ethanol solution with a concentration of 90%, adjust its pH to 3 with hydrochloric acid, add 0.1 mmol of vinyltriethoxysilane, hydrolyze against the light at 10°C for 0.5 h, and add 0.8 mmol of GO prepared by the Hummer method into the hydrolyzate , Ultrasonic dispersion 0.5h. Then put it on a shaker at 20° C. for 5 h. After the reaction, ethanol was added to centrifuge and wash 5 times to obtain alkynylated graphene oxide. Ultrasonic dispersion of 8 g of the prepared alkynylated graphene oxide was carried out in a three-necked flask filled with 100 ml of ethanol, and then 1 μmol of CuSO 4 solution, 0.5 μmol tris(3-hydroxypropyltriazolylmethyl)amine solution, 5 μmol RGD-PEG-PEI solution and 0.5 mmol sodium ascorbate (AA) solution, vacuumize, react in the dark at 30°C under nitrogen protection for 8h, and then The reacted solution was centrifuged and washed 5 times with ethanol, and then vacuum-dried to obtain a polypeptide-modified graphene oxide pow...

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Abstract

The invention discloses a polypeptide-modified graphene oxide-modified composite antibacterial forward osmosis membrane and a preparation method thereof. The preparation method comprises the steps: mixing an aqueous solution containing a solvent with a silane coupling agent, carrying out backlight hydrolysis, then adding graphene oxide, and carrying out reaction, to obtain alkynylated graphene oxide; modifying antibacterial polypeptide on the surface of alkynylated graphene oxide by a click chemical technology, and connecting a carbon heteroatom and polypeptide, to obtain polypeptide-modifiedgraphene oxide; mixing polypeptide-modified graphene oxide, a high-molecular polymer and a solvent evenly, then coating a membrane by a liquid phase transformation method, and thus obtaining the polypeptide-modified graphene oxide-modified composite antibacterial membrane. By modifying graphene oxide with polypeptide, the antibacterial performance of graphene is effectively improved. The preparedforward osmosis membrane has the advantages of long-term antibacterial ability, no pollution, no regeneration, high permeability efficiency, stable operation, and wide application prospect.

Description

technical field [0001] The invention relates to a forward osmosis membrane, in particular to a polypeptide-modified graphene oxide modified composite antibacterial forward osmosis membrane and a preparation method thereof, belonging to the technical field of forward osmosis membrane applications. Background technique [0002] Forward osmosis refers to the process in which water flows from a region with a higher water chemical potential to a region with a lower water chemical potential through a selectively permeable membrane. Two solutions with different osmotic pressures are placed on both sides of the selectively permeable membrane, one is the raw material solution with a lower osmotic pressure, and the other is a drive solution with a higher osmotic pressure. Forward osmosis applies The osmotic pressure difference of the solution on both sides of the membrane is used as the driving force, so that water can spontaneously pass through the selectively permeable membrane from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00C02F1/44C02F103/08
CPCB01D61/002B01D67/0079B01D69/02B01D71/024B01D2325/48C02F1/445C02F2103/08Y02A20/131
Inventor 宋维广朱丽静曾志翔王刚宋明海
Owner 宁波蓝盾新材料科技有限公司
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