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Polydopamine/silver modified polymer separating membrane and preparation method

A polydopamine and polymer technology, applied in the field of membrane separation, can solve the problems of organic matter and microbial contamination, lack of bacteriostatic and bactericidal ability, etc., and achieve the effects of improved anti-pollution ability, good osmotic selectivity, and improved hydrophilicity

Inactive Publication Date: 2015-09-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its strong hydrophobicity (the contact angle of commercial ultrafiltration membranes is about 80°, and the contact angle of commercial nanofiltration membranes or reverse osmosis membranes is about 50°), polymer separation membranes are resistant to Escherichia coli and Staphylococcus aureus. and Bacillus subtilis do not have the ability to inhibit and kill bacteria, and are often polluted by organic matter and microorganisms during actual use

Method used

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  • Polydopamine/silver modified polymer separating membrane and preparation method
  • Polydopamine/silver modified polymer separating membrane and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Prepare a mixed solution of Tris, dopamine hydrochloride and water. Based on the volume of water (L), the concentration of Tris is 1.5g / L, and the concentration of dopamine hydrochloride is 1g / L. The polysulfone porous membrane is placed in the mixed solution, shaken and reacted for 1 hour, then the reaction solution is poured off, and the surface of the membrane is washed with water to obtain a polydopamine-modified polymer separation membrane. Prepare a mixed solution containing silver ammonia solution, polyvinylpyrrolidone, glucose and water. The concentration of silver nitrate was 2 g / L, the concentration of polyvinylpyrrolidone was 2 g / L, and the concentration of glucose was 1 g / L. The polydopamine-modified polysulfone membrane is placed in the mixed solution, shaken and reacted for 1 hour, and then the reaction solution is poured off, and the surface of the membrane is washed with water to obtain a polydopamine / silver-modified polysulfone porous membrane. Th...

Embodiment 2

[0023] (1) Prepare a mixed solution of Tris, dopamine hydrochloride and water. Based on the volume of water (L), the concentration of Tris is 0.5g / L, and the concentration of dopamine hydrochloride is 0.5g / L. The polyethersulfone porous membrane is placed in the mixed solution, shaken and reacted for 5 hours, and then the reaction solution is poured out, and the surface of the membrane is washed with water to obtain a polydopamine-modified polymer separation membrane. Prepare a mixed solution containing silver ammonia solution, polyethylene glycol, sodium borohydride and water. The concentration of silver nitrate is 0.5g / L, the concentration of polyethylene glycol is 1g / L, and the concentration of sodium borohydride is 0.5g / L. The polydopamine-modified polyethersulfone porous membrane was placed in the mixed solution, shaken and reacted for 5 hours, and then the reaction solution was discarded, and the surface of the membrane was washed with water to obtain a polydopamine / sil...

Embodiment 3

[0026] (1) Prepare a mixed solution of Tris, dopamine hydrochloride and water. Based on the volume of water (L), the concentration of tris was 2g / L, and the concentration of dopamine hydrochloride was 3g / L. The polyvinylidene fluoride porous membrane is placed in the mixed solution, shaken and reacted for 0.2 h, and then the reaction solution is poured out, and the surface of the membrane is washed with water to obtain a polydopamine-modified polymer separation membrane. Prepare a mixed solution containing silver ammonia solution, polyether, glucose and water. The concentration of silver nitrate is 5g / L, the concentration of polyether is 0.5g / L, and the concentration of glucose is 2g / L. The polydopamine-modified polyvinylidene fluoride membrane was placed in the mixed solution, shaken and reacted for 0.5 h, and then the reaction solution was poured out, and the surface of the membrane was washed with water to obtain a polydopamine / silver-modified polyvinylidene fluoride membr...

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Abstract

The invention relates to a polydopamine / silver modified polymer separating membrane and a preparation method. A mixed solution of trihydroxymethyl aminomethane, dopamine hydrochloride and water is prepared; a polymer separating membrane is placed in the mixed solution and is vibrated to react for 0.2-5 h, then, a reaction liquid is poured out, the surface of the membrane is cleaned with water, and the polydopamine modified polymer separating membrane is obtained; a mixed solution containing a silver-ammonia solution, a stabilizing agent, a reduction agent and water is prepared; the polydopamine modified polymer separating membrane is placed in the mixed solution and is vibrated to react for 0.5-5 h, then, a reaction fluid is poured out, the surface of the membrane is cleaned with water, and the polydopamine / silver modified polymer separating membrane is obtained. The separating membrane has good hydrophily, osmosis selectivity performance, antifouling property and antibacterial performance; the operation is simple, and amplification is easy; the pure water permeability of the membrane is improved by 10%-40%, and the sterilizing rates of escherichia coli, staphylococcus aureus and bacillus subtilis are all higher than 90%.

Description

technical field [0001] The invention relates to a polydopamine / silver modified polymer separation membrane and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Membrane separation technology has become one of the new chemical unit operations and is widely used in separation, concentration and purification processes in the industry. For example, porous ultrafiltration membranes have engineering applications in the fields of biological products, pharmaceutical products, food products, and wastewater recovery. Composite nanofiltration membranes and reverse osmosis membranes are more and more widely used in the food industry and seawater desalination. However, for a long time, the problem of membrane fouling has led to frequent cleaning of membrane separation systems during operation, which reduces the service life of membrane elements and increases operating costs, seriously affecting the further application o...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/60B01D69/02B01D67/00
Inventor 赵颂王志黄丽川王纪孝
Owner TIANJIN UNIV
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