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Preparation of antibacterial nano filter membrance

A nanofiltration membrane and antibacterial technology, which is applied in the field of preparation of antibacterial nanofiltration membranes, can solve the problems of complex preparation process, and achieve the effects of simple process, excellent performance and excellent antibacterial performance.

Inactive Publication Date: 2008-11-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN101053782A introduces antibacterial nanoparticles chemically modified by plasma into the cellulose acetate nanofiltration membrane, so that the nanofiltration membrane has antibacterial and bactericidal functions, and can resist microbial erosion. The disadvantage is that the preparation process is complicated

Method used

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  • Preparation of antibacterial nano filter membrance

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Experimental program
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Effect test

Embodiment 1

[0022] 1. After cleaning the polyethersulfone-based membrane with pure water, soak it in pure water for 10 hours, and change the water every 2 hours in between.

[0023] 2. Immerse the base film treated in step 1 in a solution of sodium polystyrene sulfonate with a concentration of 0.05mol / L for 20min, wash with pure water, and soak it for 20min; the immersion concentration is 0.05mol / L polydiallyl dimethyl ammonium chloride solution for 20min, washed with pure water, soaked for 20min. The above steps are repeated until a polyelectrolyte primary layer consisting of three layers of sodium polystyrene sulfonate film layers and three layers of polydiallyl dimethyl ammonium chloride film layers alternately is obtained, respectively.

[0024] 3. Immerse the film treated in step 2 in a sodium polyacrylate solution with a concentration of 0.002mol / L for 20min, wash with pure water, and soak it for 20min; then immerse it in polyallyl ammonium chloride-silver chloride (10mmol / LPAH+ 0....

Embodiment 2

[0029] 1. After cleaning the polyethersulfone-based membrane with pure water, soak it in pure water for 10 hours, and change the water every 2 hours in between.

[0030] 2. Immerse the base film treated in step 1 in a solution of sodium polystyrene sulfonate with a concentration of 0.05mol / L for 20min, wash with pure water, and soak it for 20min; the immersion concentration is 0.05mol / L polydiallyl dimethyl ammonium chloride solution for 20min, washed with pure water, soaked for 20min. The above steps are repeated until a polyelectrolyte primary layer consisting of three layers of sodium polystyrene sulfonate film layers and three layers of polydiallyl dimethyl ammonium chloride film layers alternately is obtained, respectively.

[0031] 3. Immerse the film treated in step 2 in a sodium polyacrylate solution with a concentration of 0.002mol / L for 20min, wash with pure water, and soak it for 20min; then immerse it in polyallyl ammonium chloride-silver chloride (10mmol / LPAH+ 0....

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Abstract

The invention relates to a method for preparing an antibacterial nanofiltration membrane, in particular to a method for preparing an antibacterial nanofiltration membrane by adopting a complex containing silver polyelectrolyte and utilizing a layer upon layer electrostatic self-assembly technique, which pertains to the technical field of filtration and separation. The preparation method of the antibacterial nanofiltration membrane is characterized in that: the antibacterial silver containing nanofiltration membrane is prepared first by alternate deposition of a silver containing polycation solution on the surface of a basement membrane and then by in situ reduction of a reducing agent; the preparation process comprises the steps of: (1) the preprocessing of the polysulfone ultrafiltration membrane of the basement membrane; (2) the generation of the primary lamella of polyelectrolyte on the surface of the basement membrane; (3) the preparation of an antibacterial superfine separation layer. The fine membrane is immersed into the silver containing polycation solution, namely the poly allylamine hydrochloride-silver chloride solution, for 5 to 30 minutes for several times and then immersed into a reducing agent NaBH4 solution for 2 to 24 hours and at last the antibacterial nanofiltration membrane is obtained. The nanofiltration membrane has restraining and sterilizing bacteria functions towards microorganism in water and the antibacterial rate reaches more than 99.5 percent.

Description

technical field [0001] The invention relates to a method for preparing an antibacterial nanofiltration membrane, in particular to a method for preparing an antibacterial nanofiltration membrane by using a silver-containing polyelectrolyte complex and utilizing layer-by-layer electrostatic self-assembly technology, which belongs to the membrane filtration separation technology field. Background technique [0002] Nanofiltration membrane refers to a membrane with a minimum molecular size of about 1nm with a rejection rate greater than 95% during the permeation process, the operating pressure should be less than 1.50MPa, and the molecular weight cutoff is 200-1000. Most nanofiltration membranes are charged membranes, and the separation behavior of inorganic salts is affected by both chemical potential gradient and electric potential gradient. relation. The nanofiltration membrane hinders the permeation of multivalent ions through electrostatic action, so it has a high rejecti...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/00B01D65/02
Inventor 施利毅方建慧曹志源赖特明
Owner SHANGHAI UNIV
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