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A kind of nanofiltration composite membrane, preparation method and application

A composite membrane and nanofiltration technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of secondary pollution and high water pH requirements, achieve high negative charge performance, efficient removal rate, and improve size screening performance Effect

Active Publication Date: 2021-07-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems in the prior art that the removal of heavy metal complex ions has high requirements on water quality and pH and may cause secondary pollution, the invention provides a synergistic effect of pore size screening and charge repulsion to realize the removal of heavy metal complex ions. Composite Membrane for Efficient Removal of Heavy Metal Complex Ions

Method used

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  • A kind of nanofiltration composite membrane, preparation method and application
  • A kind of nanofiltration composite membrane, preparation method and application
  • A kind of nanofiltration composite membrane, preparation method and application

Examples

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Embodiment 1

[0039] The preparation method of the nanofiltration membrane that is used for heavy metal complex ion removal in the present embodiment comprises the following steps:

[0040] 1) Using water as a solvent, prepare a graphene oxide (GO) dispersion with a concentration of 10 mg / mL;

[0041]2) Dissolve polymethacrylic acid (PMAA) in dimethylacetamide (DMAc) to obtain a solution (PMAA / DMAc) with a concentration of 100 mg / ml, and continuously add petroleum ether under stirring conditions to induce the formation of polymer gel Colloidal particles, further causing the polymer to undergo a nucleophilic reaction to obtain a dispersion containing negatively charged polymer gel particles; the added volume of petroleum ether accounts for 5% of the total volume of the solution; the particle size of the polymer gel particles is confirmed by TEM characterization 0.5-10nm.

[0042] 3) the graphene oxide (GO) dispersion in step 1) is blended with the solution obtained in step 2), and the mass ...

Embodiment 2

[0047] The preparation method of the nanofiltration composite membrane used for the removal of heavy metal complex ions in the present embodiment comprises the following steps:

[0048] 1) Using water as a solvent, prepare molybdenum disulfide (MoS2) with a concentration of 0.02 mg / mL 2 )Dispersions;

[0049] 2) Dissolve polyacrylonitrile (PAN) in N-methylpyrrolidone (NMP) to obtain a solution (PAN / NMP) with a concentration of 1mg / ml, and add water continuously under stirring conditions, and the volume of water added accounts for the total volume of the solution 15% of the polymer material is subjected to nucleophilic reaction to obtain a dispersion of negatively charged polymer gel particles; the particle size of the polymer gel particles is confirmed to be 0.5-10 nm by TEM characterization;

[0050] 3) Molybdenum disulfide (MoS2) in step 1) 2 ) dispersion and the solution obtained in step 2) are blended, the mass ratio between molybdenum disulfide and polyacrylonitrile in ...

Embodiment 3

[0052] The preparation method of the nanofiltration composite membrane used for the removal of heavy metal complex ions in the present embodiment comprises the following steps:

[0053] 1) Using water as a solvent, prepare a GO dispersion with a concentration of 0.001 mg / mL;

[0054] 2) Prepare polymethyl acrylate solution (PMA / NMP, 0.1 mg / ml), add absolute ethanol continuously under the condition of stirring, and the volume of ethanol added accounts for 85% of the total volume of the solution, so that the polymer material is subjected to nucleophilic reaction to obtain band A dispersion of negatively charged polymer gel particles; the particle size of the polymer gel particles is confirmed to be 0.5-10 nm by TEM characterization.

[0055] 3) Blend the GO dispersion in step 1) with the solution obtained in step 2), the mass ratio between GO and PMA in the blended solution is 1:10, and use a homogenizer to make a film , the film thickness is controlled at 5nm; after it is drie...

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Abstract

The invention discloses a nanofiltration composite membrane, a preparation method and an application thereof, and belongs to the field of wastewater treatment. The preparation method includes the following steps: A) preparing a 2D nanomaterial dispersion; B) first preparing a solution of a certain concentration of a polymer material, and continuously adding a poor solvent under stirring conditions, so that the polymer material undergoes a chemical reaction to obtain a negatively charged The dispersion of polymer gel particles; C) the nanomaterial dispersion in step A) and the dispersion prepared in step B) are blended, film-formed, dried, and then put into a certain concentration of alkaline solution and pure water Soak in the medium to obtain nanofiltration composite membrane. The nanofiltration composite membrane of the invention can realize efficient removal of heavy metal complex ions through the synergistic effect of pore size screening and charge repulsion. Moreover, the interception rate and flux have not changed significantly after long-term use, which is beneficial to popularization.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically relates to a nanofiltration composite membrane for removing heavy metal complex ions, a preparation method and an application. Background technique [0002] Electroplating, tanning, mining and other industries will discharge a large amount of wastewater containing heavy metals in the production process. These heavy metals and complexing agents combine to form heavy metal complex ions. These heavy metal complex ions have a large migration range and high stability, and cause great harm to the environment and people's healthy life. Theoretically, the use of polymer nanofiltration membranes can achieve the purpose of adsorption and removal of heavy metal complex ions. However, heavy metal complex ions are generally organic complexing agents, which usually cause swelling of the polymer membrane when used, which in turn leads to serious membrane fouling, and finally significan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D61/02B01D67/00B01D71/02B01D71/40C02F1/44C02F101/20
CPCB01D69/12B01D61/027B01D67/0079B01D71/02B01D71/021B01D71/40C02F1/442C02F2101/20B01D2325/14B01D69/148B01D71/44B01D71/42B01D67/0095B01D71/024B01D71/4011B01D71/0211B01D67/00793B01D71/421
Inventor 张炜铭张文彬施梦琦潘丙才吕路
Owner NANJING UNIV
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