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Hollow fiber composite nanofiltration membrane based on natural polymer and preparation method thereof

A natural polymer and fiber composite technology, which is applied in the field of hollow fiber composite nanofiltration membrane and its preparation, can solve the problems of lack of binding force between the separation layer and the base membrane, difficulty in obtaining the separation layer of the nanofiltration membrane, and reduction of the performance of the nanofiltration membrane. , to achieve a good industrial production base, thin and uniform separation layer, and stable performance

Active Publication Date: 2017-06-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that sodium alginate is used to prepare the separation layer of flat nanofiltration membranes (Desalin Water Treat, 2011, 30, 146-153). However, the performance of the obtained nanofiltration membranes is poor, and it is difficult to compare with the nanofiltration membranes prepared by traditional methods. Compare
This is due to the lack of effective binding force between the separation layer and the base membrane of the nanofiltration membrane, and the detachment of the separation layer from the base membrane will greatly reduce the performance of the nanofiltration membrane.
In addition, most of the current nanofiltration membranes based on natural compounds are prepared by casting or coating methods, which makes it difficult to obtain a thin and uniform nanofiltration membrane separation layer, so the flux of the membrane is low

Method used

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  • Hollow fiber composite nanofiltration membrane based on natural polymer and preparation method thereof
  • Hollow fiber composite nanofiltration membrane based on natural polymer and preparation method thereof
  • Hollow fiber composite nanofiltration membrane based on natural polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Dissolve 10g of natural polymer sodium alginate in 1L of water to obtain aqueous solution A; dissolve 2g of coagulant calcium chloride in 100mL of water to obtain aqueous solution B.

[0043]Immerse the outer surface of the hollow fiber polyacrylonitrile ultrafiltration support membrane treated by co-deposition surface modification of polydopamine and polyethyleneimine into the aqueous solution A (keep the interior of the hollow fiber support membrane dry), and beat the aqueous solution B by pressure into the hollow fiber and fill it.

[0044] Let the hollow fiber support membrane stand in this state for 5 minutes, then wash it several times with water, place it in saturated epichlorohydrin vapor, and cross-link it at 50°C for 5 minutes to obtain a hollow fiber composite nanomaterial based on natural polymers. The filter membrane was finally washed repeatedly with water and dried.

[0045] Electron micrographs of the surface of the prepared hollow fiber composite nanof...

Embodiment 2～13

[0047] Adjust the concentration of natural polymer sodium alginate and coagulant calcium chloride, the surface modification method and crosslinking reaction of the hollow fiber support membrane and other conditions are the same as in Example 1, as shown in Table 1.

Embodiment 14～17

[0055] Regulate the time that coagulant diffuses in natural macromolecular solution, and natural macromolecular sodium alginate concentration is 10g / L, and coagulant calcium chloride concentration is 2g / L, and all the other conditions are with embodiment 1, as shown in table 2.

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Abstract

The invention discloses a hollow fiber composite nanofiltration membrane based on a natural polymer and a preparation method thereof. The preparation method comprises the steps of immersing the outer surface of a hollow fiber support membrane with amidogen on the surface into a water solution A containing the natural polymer, injecting a water solution B containing a coagulator into the hollow fiber support membrane, diffusing for 0.1 to 60min, taking out, and draining the solution on the surface of the hollow fiber support membrane; crosslinking the hollow fiber support membrane with the surface solution being drained under the action of a cross-linking agent, and obtaining the hollow fiber composite nanofiltration membrane based on the natural polymer. A selective separation layer of the hollow fiber composite nanofiltration membrane provided by the invention is prepared from a natural polymer compound, and only water is used as a solvent during a preparation process, so that the hollow fiber composite nanofiltration membrane has the characteristics of remarkable environment protection.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a hollow fiber composite nanofiltration membrane based on natural polymers and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of water treatment technology, and its separation performance is between ultrafiltration membrane and reverse osmosis membrane. It has a high rejection rate for polyvalent salt ions and some organic molecules (200-1000 molecular weight), and can have a higher flux at a lower operating pressure, thereby saving operation and maintenance costs. Therefore, nanofiltration membranes have attracted extensive attention from industry and science, and have been widely used in many fields such as seawater desalination, water softening, drinking water and wastewater treatment. [0003] Composite nanofiltration membrane is an important class of nanofiltration membrane, which has received more and more attention because of it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D69/12B01D67/00B01D61/02C02F1/44
Inventor 徐志康杜勇郭毅邱文泽仲启智张郗何蔼
Owner ZHEJIANG UNIV
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