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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Patent CN101053782A introduces antibacterial nanoparticles chemically modified by plasma into the cellulose acetate nanofiltration membrane, so that the nanofil...

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.

Application Domain

Semi-permeable membranes

Technology Topic

UltrafiltrationSelf-assembly +10

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Examples

Experimental program(2)

Example Embodiment

[0021] Example 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+ 0.5mmol/LAgNO 3 ) for 20min, washed with pure water and soaked for 20min. The above steps are repeated until an antibacterial ultra-thin layer consisting of 5 layers of sodium polyacrylate film layers and 5 layers of polyallyl ammonium chloride-silver chloride film layers alternately is obtained, respectively.

[0025] 4. Put the membrane treated in step 3 in the reducing agent NaBH 4 Soak in the solution for 12 hours, and then soak in water for 2 hours to obtain the corresponding composite nanofiltration membrane.

[0026] Nanofiltration performance test of the nanofiltration membrane prepared in this example: the test pressure is 5.0 bar, and the flow rate of the test liquid on the membrane surface is kept at 100 mL/min to eliminate concentration polarization. To 1000mg/L Na 2 SO 4 The solution water flux of 0.36m 3 m -2 ·day -1 , the ion rejection rate is 70%; for 1000mg/L MgCl 2 Solution water flux is 0.35m 3 m -2 ·day -1 , the ion rejection rate is 78%; for 1000mg/L MgSO 4 The solution water flux is 0.22m 3 m -2 ·day -1 , the ion rejection rate is 70%.

[0027] Antibacterial performance test of the nanofiltration membrane prepared in this example in water: the total number of bacteria in 50 mL of membrane with a diameter of 25 mm is 1.5 × 10 3 The sterilization rate of CFU/mL water sample is 100%, and the total number of bacteria in 50mL is 1.5×10 4 The sterilization rate of CFU/mL water sample is 99.5%, and the total number of bacteria in 50mL is 5.5×10 4 The sterilization rate of CFU/mL water sample is 98%, and the sterilization performance is almost unchanged within 15 days.

Example Embodiment

[0028] Example 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+ 0.5mmol/LAgNO 3 ) for 20min, washed with pure water and soaked for 20min. The above steps are repeated until an antibacterial ultra-thin layer consisting of three layers of sodium polyacrylate film layers and three layers of polyallyl ammonium chloride-silver chloride film layers alternately is obtained, respectively.

[0032] 4. Put the membrane treated in step 3 in the reducing agent NaBH 4 Soak in the solution for 12 hours, and then soak in water for 2 hours.

[0033]5. Immerse the membrane treated in step 4 in a solution of sodium polystyrene sulfonate with a concentration of 0.05 mol/L for 20 minutes, wash with pure water, and soak for 20 minutes to obtain a corresponding composite nanofiltration membrane.

[0034] Nanofiltration performance test of the nanofiltration membrane prepared in this example: the test pressure is 5.0 bar, and the flow rate of the test liquid on the membrane surface is kept at 100 mL/min to eliminate concentration polarization. To 1000mg/L Na 2 SO 4 The water flux of the solution is 0.65m 3 m -2 ·day -1 , the ion rejection rate is 93%; for 1000mg/L MgCl 2 The solution water flux is 0.68m 3 m -2 ·day -1 , the ion rejection rate is 15%; for 1000mg/L MgSO 4 The water flux of the solution is 0.55m 3 m -2 ·day -1 , the ion rejection rate is 75%.

[0035] Antibacterial performance test of the nanofiltration membrane prepared in this example in water: the total number of bacteria in 50 mL of membrane with a diameter of 25 mm is 1.5 × 10 3 The sterilization rate of CFU/mL water sample is 100%, and the total number of bacteria in 50mL is 1.5×10 4 The sterilization rate of CFU/mL water sample is 99.5%, and the total number of bacteria in 50mL is 5.5×10 4 The sterilization rate of CFU/mL water sample is 98%, and the sterilization performance is almost unchanged within 15 days.

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Preparation of antibacterial nano filter membrance

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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