Method of in-situ generation of nano particle on separating membrane surface

A nanoparticle, in-situ generation technology, applied in the field of separation membrane, to achieve the effect of simple preparation method, easy operation of the preparation method, and long-lasting effect

Active Publication Date: 2013-12-04
山东净泽膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in-situ generation of nanoparticles on the surface of a separation membrane with a porous structure to improve the fouling resistance, antibacterial, catalytic or functional activity of the separation membrane has not been reported yet.

Method used

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  • Method of in-situ generation of nano particle on separating membrane surface
  • Method of in-situ generation of nano particle on separating membrane surface
  • Method of in-situ generation of nano particle on separating membrane surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0026] Soak the polysulfone ultrafiltration membrane in 10 mmol / L Tris (TRIS) hydrochloric acid buffer solution (pH8.5) (20% isopropanol aqueous solution) for 30 minutes, then add dopamine at a concentration of 10 mg / L mL. Stir or shake the solution continuously (1 minute, 20 minutes, 30 minutes, 40 minutes, 60 minutes), take out the ultrafiltration membrane, and wash it repeatedly with 20% isopropanol aqueous solution to remove unreacted dopamine and unattached polydopamine. Then soak the polydopamine-coated polysulfone ultrafiltration membrane in a 1000 mmol / L silver nitrate solution for 5 minutes (at room temperature), and after cleaning the excess silver nitrate, dry the polysulfone membrane naturally and test the surface contact angle And the formation of silver nanoparticles was observed by scanning electron microscope. The surface contact angle of the polydopamine-modified polysulfone membrane decreased significantly, and decreased significantly with the coating tim...

Embodiment 6-10

[0028] Soak the ultrafiltration membrane PVDF in 10 mmol / L Tris (TRIS) hydrochloric acid buffer solution (pH 8.5) (containing 25% isopropanol solution) for 2 hours, then add dopamine at a concentration of 2 mg / mL. Stir or shake the solution continuously (2 hours, 4 hours, 8 hours, 16 hours, 32 hours), take out the ultrafiltration membrane, and wash it repeatedly with pure water to remove unreacted dopamine and unattached polydopamine . Then soak the PVDF ultrafiltration membrane coated with polydopamine in 5000 mmol / L copper sulfate solution for 12 hours (at room temperature), and then wash the excess copper sulfate, and use the Dead-End device to test the water of PVDF ultrafiltration membrane. Flux, water flux was found to decrease with prolonged dopamine coating time. Scanning electron microscopy shows that copper nanoparticles grow on the surface of the PVDF ultrafiltration membrane and in the nanopores, and the size of the copper nanoparticles is 20-100 nanometers. ...

Embodiment 11-14

[0030] Soak the polypropylene microfiltration membrane in 50% ethanol aqueous solution, then add dopamine at a concentration of 1 mg / mL, and add potassium persulfate (0.5 mg / mL). Stir or shake the solution continuously for 48 hours, take out the microfiltration membrane, and wash it repeatedly with 50% ethanol aqueous solution to remove unreacted dopamine and unattached polydopamine. Then soak the polydopamine-coated microfiltration membrane in zinc sulfate solutions of different concentrations (51 mMol / L, 100 mMol / L, 500 mMol / L, 1 Mol / L) for 24 hours (room temperature), and then wash the excess After the salt solution, the microfiltration membrane was dried naturally, and the surface contact angle was tested. The results showed that after the growth of zinc nanoparticles, the surface contact angle of the film decreased with the increase of zinc salt concentration. The surface contact angles are 60, 58, 45, 40 degrees, respectively. The surface hydrophilicity of the microfil...

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Abstract

The invention relates to the technical field of separating membranes, and in particular to a method of in-situ generation of a nano particle on a separating membrane surface. The method comprises the following steps: conducting surface modification on a basic separating membrane surface for more than once, and conducting in-situ generation of the nano particle for more than once on the separating membrane surface subjected to the surface modification, wherein the special points are that the surface modification refers to the following steps: soaking the basic separating membrane in dopamine buffer salt solution with the concentration of 0.001 mg / mL-100 mg / mL and the PH value of 7-12, modifying for 1 min-7 d under the condition that oxygen or oxidant is participated to form a poly-dopamine layer on the basic separating membrane surface; the in-situ generation of the nano particle refers to the following steps: soaking the separating membrane with the poly-dopamine layer generated on the surface in metal salt solution with the concentration of 0,001-10,000 mM / L for 1 min-300 d to generate the nano particle in situ, or accelerating the in-situ generation of the nano particle under the action of reducer. Compared with the prior art, the preparation method is simple and easy to be operated, economic, efficient and environmental-friendly, and facilitates industrialisation.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a method for in-situ generating nanoparticles on the surface of a separation membrane. The separation membrane prepared by the method can be used as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, forward osmosis membrane, pressure delay osmosis membrane, pervaporation membrane, membrane distillation and membrane catalytic reactor, used for separation and purification of various large Molecules include drugs, proteins, and gases, catalyze liquid and gas reactions, and are used to remove various inorganic salts in water purification, wastewater treatment, and seawater desalination. Background technique [0002] Separation membrane technology refers to the technology of using a semi-permeable membrane as a selective barrier layer at the molecular level to achieve mechanical separation of mixed substances of different particle sizes when passing throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D71/00B01D71/68B01D71/26B01D71/34
Inventor 胡云霞徐卫星
Owner 山东净泽膜科技有限公司
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