Method for preparing organic/inorganic composite nanowire filtering membrane

A composite nano-filtration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult nanofiber membranes and large membrane pore size, and achieve low cost, small pore size, and excellent preparation process. simple effect

Active Publication Date: 2012-07-18
ZHEJIANG UNIV
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Problems solved by technology

Electrospinning, also known as electrospinning, is a simple, efficient and rapid spinning technology for preparing ultrafine fibers. The resulting fiber membrane has the advantages of high porosity, large specific surface area, good pore penetration and uniformity, and is widely used It is used in various fields, but it is difficult to reduce the diameter of nanowires to less than 100nm, and the membrane pore size is large, so it is difficult for nanofiber membranes to be used in ultra / nanofiltration membranes. Therefore, it is necessary to prepare nanofibers with smaller diameters to form smaller through holes line becomes the object of research

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  • Method for preparing organic/inorganic composite nanowire filtering membrane
  • Method for preparing organic/inorganic composite nanowire filtering membrane
  • Method for preparing organic/inorganic composite nanowire filtering membrane

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preparation example Construction

[0027] The preparation method of the organic / inorganic composite nanowire filter membrane comprises the following steps:

[0028] (1) Preparation of heparin solution:

[0029] Dissolving heparin sodium in a phosphate buffer solution with a pH value of 6.0-10 to obtain a heparin solution with a concentration of 0.2-2.5 g / L;

[0030] (2) Preparation of metal hydroxide nanowire solution:

[0031] Dissolve 1 to 6 mmol / L metal salt in an equal volume of 0.4 to 2.4 mmol / L ethanolamine, stir magnetically for 1 minute, and grow for 1 to 30 days at 4 to 25 degrees Celsius to prepare clarified Transparent metal hydroxide nanowire solution;

[0032] (3) Preparation of core-shell structure composite nanowire solution:

[0033] Slowly add the heparin solution to the metal hydroxide nanowire solution, and stir it magnetically for 0.5 to 24 hours, so that the negatively charged heparin is fixed on the surface of the positively charged metal hydroxide nanowire by electrostatic action, form...

Embodiment 1

[0045]Dissolve heparin sodium in a phosphate buffer solution with a pH of 7.4 to obtain a heparin aqueous solution with a concentration of 0.2 to 2.5 g / L; dissolve 4 mmol / L copper nitrate trihydrate in an equal volume of 1.6 mmol / L In ethanolamine, magnetically stirred for 1 minute, and grown at 4-25 degrees Celsius for 1-7 days, a clear and transparent copper hydroxide nanowire solution was prepared; 0-7 milliliters of heparin solution was added to 40 milliliters of copper hydroxide nanowire solution , magnetically stirred for 0.5-3 hours to prepare a core-shell structure composite nanowire solution; cut out a polyvinylidene fluoride microfiltration membrane with a diameter of 5 cm, washed and dried, soaked in 95% ethanol for 1 hour, and deionized water Rinse 3 times, then fix it in the filter container with the membrane facing up, add 10-40 ml of the above core-shell structure composite nanowire solution into the container, filter under reduced pressure at 0.08-0.1 MPa; take ...

Embodiment 2

[0049] Dissolve heparin sodium in a phosphate buffer solution with a pH of 6 to obtain an aqueous heparin solution with a concentration of 1.0 to 2.5 g / L; dissolve 4 mmol / L copper nitrate trihydrate in an equal volume of 1.6 mmol / L In ethanolamine, magnetically stirred for 1 minute, and grown at 4-25 degrees Celsius for 3-30 days, a clear and transparent copper hydroxide nanowire solution was prepared; 0-20 milliliters of heparin solution was added to 40 milliliters of copper hydroxide nanowire solution , magnetically stirred for 1 to 5 hours to prepare a core-shell composite nanowire solution; cut a polysulfone ultrafiltration membrane with a diameter of 5 cm, wash and dry, soak in 95% ethanol for 1 hour, and rinse with deionized water for 3 times , then fix it in a filter container with the membrane facing up, add 10-60 ml of the above-mentioned core-shell structure composite nanowire solution into the container, filter under reduced pressure at 0.04-0.1 MPa; take it out, rin...

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Abstract

The invention discloses a method for preparing an organic / inorganic composite nanowire filtering membrane. The method comprises the following steps of: dissolving metal salt in an aqueous solution of ethanolamine to prepare a metal hydroxide nanowire; adding a heparin solution into a metal hydroxide nanowire solution to prepare a core-shell structured composite nanowire solution; fixing a polymerporous membrane in a filtering container, keeping a membrane surface upward, adding the core-shell structured composite nanowire solution into the filtering container, and filtering under reduced pressure; and drying. Negatively charged heparin is fixed on the surface of the positively charged metal hydroxide nanowire through electrostatic action to form the core-shell structured composite nanowire taking the nanowire as a core and the heparin as a shell, and the composite nanowire is deposited on the surface of the polymer porous membrane by a dynamic membrane preparation method to form the organic / inorganic composite nanowire filtering membrane with antibacterial property and blood compatibility. The nanowire has small diameter, small pore size when loaded, and high pore density, and the preparation process is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of composite filter membranes, in particular to a method for preparing an organic / inorganic composite nanowire filter membrane. Background technique [0002] Membrane separation is a new technology that appeared in the early 20th century and rose rapidly after the 1960s. Membrane separation technology not only has the functions of separation, concentration, purification and refining, but also has high efficiency, energy saving, environmental protection, molecular level filtration and The filtering process is simple and easy to control. At present, membrane separation technology has been widely used in food, medicine, biology, environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields, resulting in huge economic and social benefits. One of the most important means. Currently developed membrane processes include microfiltration, ultrafil...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08L27/16C08L81/06B01D69/12B01D71/34B01D71/68B01D67/00
Inventor 朱利平朱丽静易砖徐又一
Owner ZHEJIANG UNIV
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