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Method for preparing antibacterial and antifouling separation membrane through surface grafting modification

A surface graft modification and separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as increasing production and operating costs, reducing membrane flux and life, and achieving high efficiency and stability. Antibacterial properties, prevention of adsorption and deposition, effect of good selection properties

Active Publication Date: 2017-10-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fouling on the surface of the membrane will form a fouling resistance layer, reducing the flux and life of the membrane, causing additional energy consumption and chemical cleaning, increasing the production and operating costs of the membrane

Method used

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  • Method for preparing antibacterial and antifouling separation membrane through surface grafting modification
  • Method for preparing antibacterial and antifouling separation membrane through surface grafting modification
  • Method for preparing antibacterial and antifouling separation membrane through surface grafting modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 10 g of guanidine hydrochloride, 5 g of 1,6-hexanediamine, and 1 g of polyethyleneimine (molecular weight 600), add them to the reactor, mix them evenly, under nitrogen protection, heat up to 120 ° C, and reflux with stirring for 10 hours. , to obtain polyethyleneimine-based guanidine-containing polymers.

[0029] Dissolve 0.1 g of tris(hydroxymethyl)aminomethane in 100 mL of water, add 0.05 g of dopamine hydrochloride, and mix well. The reaction solution configured above is poured into the frame of the fixed polyamide reverse osmosis membrane, the membrane surface is contacted with the reaction solution, the reaction solution is poured out after 2 hours of reaction in the shaker, and the membrane surface is washed with water; then, the configuration concentration is 5g / L of polyethyleneimine-based guanidine-containing polymer aqueous solution, mixed evenly, poured into the frame, shaken and reacted for 2 hours, poured off the reaction solution, and washed the memb...

Embodiment 2

[0032] Take aminoguanidine hydrochloride 10g, trimethylhexanediamine 10g, polyoxyethylene diamine (molecular weight 1000) 5g, add to the reactor, mix well, under nitrogen protection, heat up to 160 ℃, and reflux under stirring for reaction 6 After one hour, a polyoxyethylene diamine-based guanidine-containing polymer was obtained.

[0033] Dissolve 0.1 g of tris(hydroxymethyl)aminomethane in 100 mL of water, add 0.2 g of dopamine hydrochloride, and mix well. The reaction solution of the above configuration is poured into the frame of the fixed polysulfone ultrafiltration membrane, the membrane surface is contacted with the reaction solution, the reaction solution is poured out after 1 hour of reaction in the shaker, and the membrane surface is washed with water; then, the configuration concentration is 2 g / L aqueous solution of polyoxyethylene diamine guanidine-containing polymer, mixed evenly, poured into the frame, shaken and reacted for 1 hour, poured out the reaction solut...

Embodiment 3

[0036] Take 10 g of triaminoguanidine hydrochloride, 20 g of triethylene tetramine, and 10 g of polyetheramine (molecular weight: 230), put them into the reactor, mix them evenly, under nitrogen protection, heat up to 200 ° C, and reflux with stirring for 4 hours. A polyetheramine-based guanidine-containing polymer was obtained.

[0037]Dissolve 0.1 g of tris(hydroxymethyl)aminomethane in 100 mL of water, add 0.3 g of dopamine hydrochloride, and mix well. Pour the above-configured reaction solution into the frame of the fixed polyvinylidene fluoride ultrafiltration membrane, make the membrane surface contact the reaction solution, pour out the reaction solution after reacting in the shaker for 0.5 hours, and wash the membrane surface with water; then, configure The aqueous solution of polyetheramine guanidine-containing polymer with a concentration of 1 g / L was mixed evenly and poured into the frame. After shaking reaction for 4 hours, the reaction solution was poured out, and...

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Abstract

The invention discloses a method for preparing an antibacterial and antifouling separation membrane through surface grafting, and grafting a functional guanidyl macromolecular antimicrobial material to a surface of the separation membrane. The method comprises the following steps: firstly, mixing guanidine salt, polyamine micromolecule and polyamine polymer uniformly; performing heating reflux reaction under the protection of nitrogen to prepare the functional guanidyl macromolecular antimicrobial material; then, contacting the separation membrane with a mixed aqueous solution of dopamine hydrochloride and tris(hydroxymethyl)aminomethane to obtain a polydopamine-modified separation membrane; grafting the guanidyl macromolecular antimicrobial material to the surface of the membrane to obtain the guanidyl macromolecular grafted polymer separation membrane. The method provided by the invention is simple in preparation process, mild in preparation condition, easy in amplification, and suitable for surface modification of a plurality of separation membranes; the prepared separation membrane can maintain original permeation selectivity of the polymer separation membrane basically, and maintain excellent antibacterial performance and anti-pollution performance durably and efficiently in a use process.

Description

technical field [0001] The invention belongs to the field of polymer separation membrane preparation, in particular to a method for preparing an antibacterial and anti-pollution separation membrane by surface graft modification. Background technique [0002] Climate change and the rapid development of global industry and agriculture have made the shortage of freshwater resources increasingly serious, which has posed a major threat to the social and economic development of all countries. In recent years, how to deal with the lack of freshwater resources has become a hot issue that people are concerned about. In addition to management measures such as optimal allocation of water resources, efficient water treatment technology (especially membrane water treatment technology) has gradually become an effective way to increase revenue and reduce expenditure. [0003] Membrane water treatment technologies mainly include microfiltration, ultrafiltration, nanofiltration and reverse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/68B01D71/34B01D71/26B01D71/42B01D67/00
CPCB01D67/0006B01D71/26B01D71/34B01D71/42B01D71/56B01D71/68B01D2325/48
Inventor 赵颂高勇强王志王纪孝
Owner TIANJIN UNIV
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