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Preparation method of antibacterial cellulose flat nanofiltration membrane

A technology of regenerated cellulose membrane and cellulose, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of reducing production cost, wide source, and easy to obtain

Active Publication Date: 2021-03-02
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chitosan and titanium dioxide have been successfully applied to polysulfone, polyethersulfone, polyvinyl chloride, polyvinylidene fluoride, polyacrylonitrile, etc., but have not been applied to cellulose flat membranes.
In addition, it has not been reported to mix and graft the two on the surface of cellulose-based nanofiltration membranes.

Method used

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  • Preparation method of antibacterial cellulose flat nanofiltration membrane
  • Preparation method of antibacterial cellulose flat nanofiltration membrane
  • Preparation method of antibacterial cellulose flat nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Dissolve the bamboo pulp in 75wt% NMMO aqueous solution after crushing, add 1wt‰ n-propyl gallate, stir and react at 100°C for 3h, then stop heating, turn off the stirrer after the temperature drops to 90°C, and pump Vacuum or static defoaming for 3 hours to obtain 6 wt % cellulose casting solution, pour the obtained cellulose casting solution on a glass plate, use a coating machine to scrape to form a film, then quickly immerse in deionized water, and remove the film , to produce regenerated cellulose membrane (RCM);

[0035] 2) RCM was cut into A4-sized membranes, placed in 10 g / L dopamine solution prepared by tris-HCl buffer (50 mM, pH=8.6), and shaken at constant temperature for 5 hours to self-polymerize dopamine. Then, fully wash with deionized water;

[0036] 3) Soak the obtained surface-modified regenerated cellulose membrane in an aqueous solution of 2 wt% polyethyleneimine (PEI) for 20 min, take it out, blot the remaining liquid droplets on the surface wit...

Embodiment 2

[0041] 1) Dissolve the bamboo pulp in 75wt% NMMO aqueous solution after crushing, add 1wt‰ n-propyl gallate, stir and react at 100°C for 3h, then stop heating, turn off the stirrer after the temperature drops to 90°C, and pump Vacuum or static defoaming for 3 hours to obtain 6 wt % cellulose casting solution, pour the obtained cellulose casting solution on a glass plate, use a coating machine to scrape to form a film, then quickly immerse in deionized water, and remove the film , to produce regenerated cellulose membrane (RCM);

[0042] 2) RCM was cut into A4-sized membranes, placed in 10 g / L dopamine solution prepared by tris-HCl buffer (50 mM, pH=8.6), and shaken at constant temperature for 5 hours to self-polymerize dopamine. Then, fully wash with deionized water;

[0043] 3) Soak the obtained surface-modified regenerated cellulose membrane in an aqueous solution of 2 wt% polyethyleneimine (PEI) for 20 min, take it out, blot the remaining liquid droplets on the surface wit...

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PUM

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a preparation method of an antibacterial cellulose flat nanofiltration membrane. According to the invention, an antibacterial reagent chitosan and a hydrophilic reagent titanium dioxide are introduced to a separation membrane, and a loose anti-pollution layer is formed on the surface of the membrane,so that a water passing channel is increased, and the water flux of the membrane is improved. In addition, titanium dioxide is used as an inorganic antibacterial property, so that the antibacterial property of the separation membrane is improved, and the prepared separation membrane has good anti-pollution property.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of an antibacterial cellulose flat nanofiltration membrane. Background technique [0002] Membrane fouling has always been the main factor affecting the separation performance of separation membranes. According to the type of fouling, it can be divided into organic fouling, inorganic fouling and biological fouling. Among them, organic pollution and inorganic pollution can be cleaned by chemical or physical cleaning methods to restore the separation performance of the separation membrane. However, because biological fouling is usually adsorbed on the surface, microorganisms grow and multiply on the surface of the separation membrane, and some biological waste generated is difficult to clean by conventional methods, and the pollution of the membrane is an irreversible process. Therefore, the separation membrane module needs to be replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D71/02B01D69/12B01D67/00
CPCB01D71/76B01D71/024B01D69/122B01D67/0079B01D61/027
Inventor 汪东黄六莲林珊张慧马晓娟陈礼辉倪永浩李建国
Owner FUJIAN AGRI & FORESTRY UNIV
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