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Amphoteric substance-based polyamide nanofiltration membrane surface modification method

A surface modification and polyamide technology, which is applied in the field of surface modification of polyamide nanofiltration membranes based on amphoteric substances, can solve the problems of insufficient retention performance of nanofiltration membranes, low membrane surface repulsion, and short service life. , to achieve good prospects for large-scale production and application, excellent hydrophilicity, and easy operation

Pending Publication Date: 2021-07-09
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method for modifying the surface of polyamide nanofiltration membrane based on amphoteric substances in order to solve the technical problems that the interception performance of the existing nanofiltration membrane is not high enough, the membrane surface has little repulsion effect on pollutants and the actual service life is not long

Method used

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Embodiment 1

[0038] Embodiment 1: a kind of polyamide nanofiltration membrane surface modification method based on amphoteric substance of the present embodiment is carried out as follows:

[0039] Step 1, prepare dopamine mixed solution, then mix it with Tris-HCl buffer solution (200mL, pH is 8.5, 2.0mmol), obtain dopamine coating solution;

[0040] Step 2, fix the polyamide nanofiltration membrane to be modified on the reactor, infiltrate the active layer side of the polyamide nanofiltration membrane with the dopamine coating solution, the infiltration process is accompanied by vibration, and the vibration speed is 60rmp / min, the time of shaking is 30min to obtain dopamine modified membrane (TFC-PDA);

[0041] Step 3, soak the dopamine-modified membrane obtained in step 2 in 150 mL of SBMA solution with a concentration of 0.078 g / mL, blow with nitrogen for 20 min, then add 8 mL of ligand solution (the concentration of cupric chloride is 0.0005 g / mL, with The concentration of TPMA is 0....

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Abstract

The invention discloses an amphoteric substance-based polyamide nanofiltration membrane surface modification method, and belongs to the field of membrane material modification. The technical problems that an existing nanofiltration membrane is not high enough in interception performance, the rejection effect of the membrane surface on pollutants is not large, and the actual service life is short are solved. The modification method comprises the following steps: (1) dissolving substances such as dopamine and 2-bromoisobutyryl bromide in an organic solvent, and conductiing mixing with a buffer solution to form a coating solution; (2) enabling one side of the active layer of the base membrane to be in contact with the coating solution, slowly conducting oscillating for a certain time, taking out the membrane, and storing the membrane in an isopropanol solution; and (3) grafting zwitterions on the surface of the composite membrane coated with polydopamine by virtue of a surface-initiated atom transfer radical polymerization method. The desalination performance, the selective separation performance and the anti-pollution performance of the modified polyamide composite membrane are remarkably enhanced, the treatment effect of the composite membrane in brackish underground water application is improved, and the service life of the composite membrane is prolonged.

Description

technical field [0001] The invention belongs to the field of membrane material modification, in particular to a method for modifying the surface of polyamide nanofiltration membranes based on amphoteric substances Background technique [0002] The performance of nanofiltration membrane is between the performance of ultrafiltration and reverse osmosis membrane. Under the drive of lower pressure, nanofiltration can obtain stable flux and effective removal rate, so it can be used in drinking water purification, sewage reuse, seawater Desalination and desalination of brackish water are widely used. Membrane fouling is a bottleneck in membrane separation technology. During long-term operation, membrane permeability deteriorates, energy consumption increases, and the service life of membrane components is shortened. These unavoidable conditions limit the practical application of nanofiltration membranes in the water treatment industry. application. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/56
CPCB01D71/56B01D61/027B01D67/0093B01D69/02B01D2325/36Y02A20/131
Inventor 白朗明梁恒丁俊文王莹姚利辉李圭白
Owner HARBIN INST OF TECH
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