A method for preparing antibacterial and antifouling separation membranes by surface graft modification

A surface graft modification and separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of reducing membrane flux and life, increasing production and operating costs, preventing adsorption and Deposition, efficient and stable antibacterial properties, good stability effect

Active Publication Date: 2020-10-30
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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  • A method for preparing antibacterial and antifouling separation membranes by surface graft modification
  • A method for preparing antibacterial and antifouling separation membranes by surface graft modification
  • A method for preparing antibacterial and antifouling separation membranes by surface graft modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 10g of guanidinium hydrochloride, 5g of 1,6-hexamethylenediamine, and 1g of polyethyleneimine (molecular weight: 600), add them into the reactor, mix well, and raise the temperature to 120°C under the protection of nitrogen, and reflux for 10 hours under stirring. , to obtain polyethylenimine-containing guanidine polymers.

[0029] Dissolve 0.1g of Tris in 100mL of water, add 0.05g of dopamine hydrochloride, and mix well. Pour the reaction solution configured above into the frame of the fixed polyamide reverse osmosis membrane, make the membrane surface contact the reaction solution, pour off the reaction solution after reacting in the oscillator for 2 hours, and wash the membrane surface with water; then, configure the concentration of 5g / L 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 membrane surface with water to obtain ...

Embodiment 2

[0032] Take 10g of aminoguanidine hydrochloride, 10g of trimethylhexamethylenediamine, and 5g of polyoxyethylenediamine (molecular weight: 1000), add them into the reactor, mix well, and under the protection of nitrogen, heat up to 160°C, and reflux under stirring for 6 Hours later, a polyoxyethylene diamine-based guanidine-containing polymer was obtained.

[0033] Dissolve 0.1 g of Tris in 100 mL of water, add 0.2 g of dopamine hydrochloride, and mix well. Pour the reaction solution configured above into the frame of the fixed polysulfone ultrafiltration membrane, make the membrane surface contact the reaction solution, pour off the reaction solution after reacting in the oscillator for 1 hour, and wash the membrane surface with water; then, configure the concentration of 2g / L aqueous solution of polyoxyethylene diamine-based guanidine-containing polymer, mixed evenly, poured into the frame, shaken and reacted for 1 hour, poured off the reaction solution, and washed the membr...

Embodiment 3

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

[0037]Dissolve 0.1 g of Tris in 100 mL of water, add 0.3 g of dopamine hydrochloride, and mix well. Pour the reaction solution configured above into the frame of the fixed polyvinylidene fluoride ultrafiltration membrane, make the membrane surface contact the reaction solution, react in the oscillator for 0.5 hours, pour off the reaction solution, and wash the membrane surface with water; then, configure The aqueous solution of polyetheramine-based guanidine-containing polymer with a concentration of 1g / L is mixed evenly and poured into the frame, and the reaction solution is poured off after shaking for 4 hours, and the surface of the membrane is wash...

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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 preparation of polymer separation membranes, in particular to a method for preparing antibacterial and anti-pollution separation membranes through surface graft modification. Background technique [0002] Climate change and the rapid development of global industry and agriculture have exacerbated the shortage of fresh water resources, which has posed a major threat to the social and economic development of various countries. In recent years, how to deal with the shortage of fresh water resources has become a hot issue that people pay attention to. 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 Patents(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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