Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF3 Cites 38 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation of antibacterial nano filter membrance

Examples

Experimental program
Comparison scheme
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....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D71/68B01D69/00B01D65/02
Inventor 施利毅方建慧曹志源赖特明
Owner SHANGHAI UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com