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A method for modifying hollow fiber ultrafiltration membranes by using gelatin protein and hydroxide nanowires

A gelatin protein and hydroxide technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of short utilization cycle, complex process, high price, etc., achieve simple process, improve service life, and reduce costs. Effect

Active Publication Date: 2016-03-16
NINGBO OULIN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the introduction of the booster pump in RO technology, the cost is greatly increased
At the same time, RO technology also filters out all the trace elements needed by the human body, which requires the subsequent addition of expensive trace element slow-release sticks (the patented technology is monopolized by foreign countries); the process is complicated, and due to the hydrophobicity of the membrane material itself characteristics, easy to be polluted by organic matter and cause biological failure, and the short utilization period makes the price expensive

Method used

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  • A method for modifying hollow fiber ultrafiltration membranes by using gelatin protein and hydroxide nanowires
  • A method for modifying hollow fiber ultrafiltration membranes by using gelatin protein and hydroxide nanowires
  • A method for modifying hollow fiber ultrafiltration membranes by using gelatin protein and hydroxide nanowires

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Effect test

Embodiment 1

[0022] 1. At room temperature, the same volume of 4mM copper nitrate (Cu(NO 3 ) 2 ) aqueous solution and 1.4mM ethanolamine (NH 2 CH 2 CH 2 OH) aqueous solution was mixed under magnetic stirring, and then left for 2-3 days to generate Cu(OH) 2 nanowire solution.

[0023] 2. Add 1% gelatin protein aqueous solution to the above Cu(OH) by weight percentage 2 In the nanowire aqueous solution, the final gelatin protein concentration is 0.02% by weight.

[0024] 3. Immerse the polyvinylidene fluoride (PVDF) ultrafiltration hollow fiber membrane in the above mixture, and vacuum filter for 1 hour to form a very thin 200-400 thick gelatin protein on its surface / Cu(OH) 2 nanowire composite layer.

[0025] 4. Soak the above PVDF hollow fiber membrane with a gelatin protein / hydroxide nanowire composite layer in 2.5% glutaraldehyde solution, and get gelatin protein / Cu with a thickness of 200-400nm on the surface after 2 hours. (OH) 2 PVDF hollow fiber membrane with nanowire comp...

Embodiment 2

[0028] 1. At room temperature, the same volume of 4mM copper nitrate (Zn(NO 3 ) 2 ) aqueous solution and 1.4mM ethanolamine (NH 2 CH 2 CH 2 OH) aqueous solution was mixed under magnetic stirring, and then left for 0.5-2 hours to generate Zn(OH) 2 nanowire solution.

[0029] 2. Add 1% gelatin protein aqueous solution to the above Zn(OH) by weight percentage 2 In the nanowire aqueous solution, the final gelatin protein concentration is 0.02% by weight.

[0030] 3. Immerse the polyvinylidene fluoride (PVDF) ultrafiltration hollow fiber membrane in the above mixture, and vacuum filter for 1 hour to form a thin layer of 200-400nm thick gelatin on its surface Protein / Zn(OH) 2 nanowire composite layer.

[0031] 4. Soak the above PVDF hollow fiber membrane with gelatin protein / hydroxide nanowire composite layer in 2.5% glutaraldehyde solution, and get 200-400nm thick gelatin protein / Zn on the surface after bonding for 2 hours. (OH) 2 PVDF hollow fiber membrane with nanowire ...

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Abstract

The invention discloses a modification method of a hollow fiber ultrafilter membrane by employing a gelatin protein and hydroxide nanowires. The method includes following steps: preparing an Cu(OH)2 or Zn(OH)2 nanowires aqueous solution, wherein nanowires carry positive charges, are about 2 nm in diameter and are micron-scale in length; adding a gelatin protein aqueous solution with a weight percentage being 0.2-5% to the hydroxide nanowire aqueous solution to enable a final concentration of the gelatin protein in the mixed liquid to be 0.04-0.1% by weight of the gelatin protein in a mixed liquid to be 0.004-0.1%; filtering the mixed liquid on a polyvinylidene fluoride hollow fiber ultrafilter membrane to form a very thin gelatin protein / hydroxide nanowire composite layer on the surface of the polyvinylidene fluoride hollow fiber ultrafilter membrane; and then soaking the polyvinylidene fluoride hollow fiber ultrafilter membrane in a glutaraldehyde solution for carrying out a crosslinking reaction to obtain a PVDF hollow fiber membrane, wherein a crosslinked gelatin protein / hydroxide nanowire composite film modifying layer is attached to the surface of the hollow fiber membrane. The modified hollow fiber ultrafilter membrane is significantly enhanced in separating performance and can separate cytochromes with sizes being about 3 nm.

Description

technical field [0001] The invention relates to a preparation method and separation performance of a pressure-driven composite hollow fiber membrane with a modified layer, which is mainly used for the separation of nanoparticles and macromolecules in an aqueous solution; specifically, a method using gelatin protein and hydroxide nanowires A method for modifying hollow fiber ultrafiltration membranes. technical background [0002] With the rapid development of modern industry, the degree of pollution of water sources has also increased rapidly, coupled with the interference of various factors during the transportation of tap water, today's drinking water is becoming more and more worrying. It is becoming more and more difficult to drink healthy water, and household water purifiers can better solve these problems. The core component of the water purifier is the membrane separation system. There are currently two types, one is ultrafiltration membrane, but its ultrafiltration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/18B01D69/08B01D67/00C02F1/44
Inventor 郑检生徐剑光
Owner NINGBO OULIN IND CO LTD