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Modified polyamide composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and polyamide technology, applied in the field of membrane separation, can solve the problems of poor positive charge, poor rejection rate of high-valence cations, etc., and achieve good separation selectivity

Active Publication Date: 2021-07-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a modified polyamide composite nanofiltration membrane and a preparation method thereof to at least solve the problem of poor positive charge in the prior art and the resulting problems Problems such as poor rejection of substances containing high-valence cations

Method used

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  • Modified polyamide composite nanofiltration membrane and preparation method thereof
  • Modified polyamide composite nanofiltration membrane and preparation method thereof
  • Modified polyamide composite nanofiltration membrane and preparation method thereof

Examples

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preparation example Construction

[0029] The preparation method of the modified polyamide composite nanofiltration membrane provided by the present invention comprises the following steps: (1) using polyamines and polyacyl chlorides as polymerization raw materials, in-situ polymerization on the surface of the supporting base membrane by interfacial polymerization to form a polyamide layer , to obtain an unmodified composite membrane; (2) use a diamine monomer to aminate the unmodified composite membrane to obtain an amino-modified composite membrane; (3) use diamine monomer and diene monomer as polymerization raw materials , in-situ polymerization on the polymer layer of the amino-modified composite membrane to generate a hyperbranched polymer to obtain a modified polyamide composite nanofiltration membrane.

[0030] In some embodiments, the process of step (1) includes: immersing the supporting base film in an aqueous phase solution containing polyamines, taking it out, then immersing it in an oil phase soluti...

Embodiment 1

[0040] The preparation method of modified polyamide composite nanofiltration membrane is as follows:

[0041] (1) N-aminoethylpiperazine is dissolved in water to obtain N-aminoethylpiperazine solution; trimesoyl chloride is dissolved in n-hexane to obtain the n-hexane solution of trimesoyl chloride, wherein N -The mass fraction of aminoethylpiperazine is 0.5%, and the massfraction of trimesoyl chloride is 0.1%; the support base membrane (pore diameter is 20nm) that will comprise polyethersulfone layer is soaked in the water of N-aminoethylpiperazine After taking it out, immerse it in the n-hexane solution of trimesoyl chloride for 1 minute. After taking it out, dry it at 80°C for 8 minutes to obtain an unmodified composite film;

[0042] (2) N-aminoethylpiperazine is dissolved in water to make N-aminoethylpiperazine solution, wherein the mass fraction of N-aminoethylpiperazine is 1%; The composite membrane was immersed in the N-aminoethylpiperazine solution for 2 hours, and a...

Embodiment 2

[0045] The mass fraction of the N-aminoethylpiperazine of step (3) in Example 1 is increased to 12.4%, making N-aminoethylpiperazine and N, the N-methylenebisacrylamide mol ratio is 1.2: 1. Other conditions remain unchanged.

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Abstract

The invention provides a modified polyamide composite nanofiltration membrane, which comprises a supporting base membrane and a polyamide layer located on the surface of the supporting base membrane, the polyamide layer is grafted with a hyperbranched polymer, and the hyperbranched polymer comprises a product formed by polymerizing a diamine monomer and a diene monomer. The modified polyamide composite nanofiltration membrane provided by the invention has excellent positively charged property and separation selectivity on substances containing high-valence cations.

Description

technical field [0001] The invention relates to a modified polyamide composite nanofiltration membrane and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. It has the advantages of low operating pressure, large flux, and high efficiency. It has gradually become an important separation method in the field of water treatment. The nanofiltration membrane has a pore size of about 0.5-2nm and a molecular weight cut-off of 200-1000Da. Based on the pore size screening principle, the nanofiltration membrane can effectively separate organic molecules of different molecular weights. The separation of ions of different valence states by nanofiltration membranes depends on the synergistic effect of pore size sieving and charge repulsion effect. Therefore, the chargeability of the separation layer on the surface o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/56B01D67/00B01D61/02C02F1/44
CPCB01D69/125B01D69/02B01D71/56B01D67/0093B01D61/027C02F1/442B01D2325/16Y02A20/131
Inventor 汪林林亚凯王晓琳
Owner TSINGHUA UNIV
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