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Supramolecular polymer nanofiltration membrane and preparation method thereof

A technology of supramolecular polymers and nanofiltration membranes, applied in the field of nanofiltration membranes, can solve problems such as no related research on membrane separation materials, and achieve the effects of increased control means, fewer assembly layers, and high efficiency

Active Publication Date: 2016-12-07
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, people try to apply it to drug controlled release, molecular recognition, self-healing polymer materials such as hot-melt coatings, etc., but there is no relevant research on membrane separation materials.

Method used

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  • Supramolecular polymer nanofiltration membrane and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The ultrafiltration membrane used in this embodiment is an alkali-modified polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of 50,000. Supramolecular polymer made of Zn 2+ Coordination of ions with bischelidinic acid ligand.

[0030] The assembly is carried out in a porcelain container with a porous support with a diameter of 10 cm. Place the ultrafiltration membrane with the membrane side up and the edges fixed, place it in a container, and assemble it according to the following steps:

[0031] 1) Prepare a 0.2% polyallylammonium chloride solution by mass percentage, add NaCl, the NaCl concentration is 0.5M, and the pH is adjusted to 2.5.

[0032] 2) Prepare 5mmol / L zinc ion solution and dichelioleic acid solution respectively, adjust the pH to 5.4 with buffer solution, press Zn 2+ : L 2 EO 4 The two solutions are mixed at a ratio of 1:1, and the supramolecular polymer is obtained after being placed, ready to be assembled.

[0033] 3) Add polyallyl a...

Embodiment 2

[0043] The ultrafiltration membrane used in this embodiment is a polyethersulfone ultrafiltration membrane with a molecular weight cut-off of 30,000. Supramolecular polymer made of Fe 3+ Coordination of ions with bischelidinic acid ligand.

[0044] The assembly is carried out in a porcelain container with a porous support with a diameter of 10 cm. Place the ultrafiltration membrane with the membrane side up and the edges fixed, place it in a container, and assemble it according to the following steps:

[0045] 1) Prepare a polyallylammonium chloride solution with a concentration of 0.3% by mass, add NaCl, the concentration of NaCl is 0.5M, and adjust the pH to 3.0.

[0046] 2) Prepare 5mmol / L iron ion solution and bischelioleic acid solution respectively, adjust pH to 5.4 with buffer solution, press Fe 3+ : L 2 EO 4 The two solutions are mixed at a ratio of 1:2, and the supramolecular polymer is obtained after being placed.

[0047] 3) Add polyallyl ammonium chloride solution to the ...

Embodiment 3

[0057] According to the conditions of Example 1, press Zn 2+ : L 2 EO 4 Supramolecular polymer was prepared by coordination with a ratio of 1:2, and the nanofiltration membrane was obtained after two rounds of assembly. The separation performance of the membrane in Example 3 is shown in Table 1.

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Abstract

The invention discloses a supramolecular polymer nanofiltration membrane and a preparation method thereof. According to the nanofiltration membrane, an ultrafiltration membrane serves as a base membrane, a supramolecular polymer and covalent positive ion polyelectrolyte serve as assembling substances, and the nanofiltration membrane is prepared in a dynamic and static mixing layer-layer self assembling mode, wherein the ultrafiltration membrane is loaded with negative electricity, and the molecular cut off is smaller than 70, 000; the supramolecular polymer is a coordination type supramolecular polymer. By adjusting the kinds of transition metal ions, the matching of metal ions to a ligand, concentration of the metal ions and the ligand, the concentration of the supramolecular polymer, the kinds of the covalent positive ion polyelectrolyte, the number of assembling layers, the kinds of base membranes and the like, the structure of the nanofiltration membrane can be conveniently adjusted, nanofiltration membranes meeting different requirements are prepared, an adopted solvent in the whole assembling process is water, and the preparation process is environmentally friendly.

Description

Technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and specifically relates to a supramolecular polymer nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane is a new type of separation membrane with a membrane pore size of less than 2nm, driven by pressure. It can selectively separate monovalent and divalent ions, and has a high rejection rate for small molecular organics. At present, it is widely used in food, medicine, chemical industry and other fields, especially in hard water softening and harmful ion removal in water. As far as high-quality nanofiltration membranes are concerned, high flux, good selectivity, anti-pollution, stable performance, energy saving, and environmental protection are their salient features. In order to achieve high flux and good selectivity, people often prepare composite membranes, that is, cover a very thin selective separation layer on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D71/68B01D67/00
CPCB01D67/0002B01D71/42B01D71/68
Inventor 邓慧宇邓兆龙陈庆春张小广刘兴段龙繁陈荣那兵
Owner EAST CHINA UNIV OF TECH
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