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Nanofiltration membrane and preparation method of nanofiltration membrane

A technology of nanofiltration membrane and membrane surface, applied in the field of preparation of nanofiltration membrane and nanofiltration membrane, can solve the problems of cumbersome preparation process and insufficient stability of nanofiltration membrane, and achieve simple preparation process, good hydrophilicity and permeability. high flux effect

Active Publication Date: 2021-05-25
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a nanofiltration membrane and a preparation method of the nanofiltration membrane. The self-assembled modified nanofiltration membrane of tannic acid and polyetheramine prepared by the method has a stable coating structure, a surface The properties can be adjusted, the coating is firmly combined with the original polymer membrane, and the rejection rate is high, and the preparation process is simple, so as to solve the technical problems of insufficient stability and cumbersome preparation process of the layer-by-layer self-assembled nanofiltration membrane in the prior art

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  • Nanofiltration membrane and preparation method of nanofiltration membrane

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preparation example Construction

[0040] The invention discloses a preparation method of a nanofiltration membrane, wherein the nanofiltration membrane comprises an original polymer membrane and a tannic acid layer and a polyetheramine layer formed on the surface of the original polymer membrane, and the preparation method of the nanofiltration membrane specifically includes The following steps:

[0041] S1: Weigh at least one of the polymer polyacrylonitrile (PAN), polyethersulfone (PES), polysulfone (Psf) and polyimide (PI), and weigh the solvent N-methylpyrrolidone (NMP) , at least one of dimethylsulfoxide (DMSO) and N,N-dimethylformamide (DMF), and then formulated into a polymer solution with a mass fraction of 16-20%;

[0042] S2: Add a porogen to the above polymer solution, and stir until completely dissolved to obtain a casting solution; wherein, the porogen is polypyrrolidone (PVP), polyethylene glycol 400 (PEG-400) and polyethylene glycol At least one of alcohol 800 (PEG-800), the mass fraction of th...

Embodiment 1

[0051] A preparation method of a nanofiltration membrane, specifically comprising the following steps:

[0052] S1: Weigh polyacrylonitrile raw materials and N-methylpyrrolidone (NMP), and prepare a polyacrylonitrile N-pyrrolidone solution with a mass fraction of 19%;

[0053] S2: Add 1% polyethylene glycol 800 (PEG-800) to the N-pyrrolidone solution of polyacrylonitrile, and stir and mix until completely dissolved to obtain a casting solution;

[0054] S3: The above-mentioned casting solution is prepared by using the immersion precipitation phase inversion method to prepare the membrane, and the prepared membrane is washed with deionized water for several times to obtain the original polymer membrane;

[0055] S4: preparing a phosphate buffer solution with a pH value of 8;

[0056] S5: dissolving tannic acid in the above buffer solution to prepare a tannic acid solution with a concentration of 0.3 g / L;

[0057] S6: Dissolving polyetheramine 500 in the above buffer solution ...

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Abstract

The invention provides a nanofiltration membrane and a preparation method of the nanofiltration membrane. The nanofiltration membrane comprises an original polymer membrane and a tannic acid layer and a polyetheramine layer formed on the surface of the original polymer membrane, and its preparation method comprises the following steps: preparing the original polymer membrane; preparing a phosphate buffer solution; adding tannic acid and polyether amine were dissolved in phosphate buffer solution respectively to prepare tannic acid solution and polyether amine solution; the original polymer film was soaked in tannic acid solution, and then rinsed with deionized water for 5 minutes; And soak the original polymer film after rinsing in polyether amine solution, then rinse with deionized water for 5min; repeat immersion in tannic acid and polyether amine solution 0-2 times; carry out reactivity through tannic acid and polyether amine The nanofiltration membrane is prepared by layer-by-layer self-assembly. The preparation process is simple, the structure of the nanofiltration membrane coating is stable, and the rejection rate is high, thereby solving the technical problems of insufficient stability of the layer-by-layer self-assembled nanofiltration membrane and cumbersome preparation process in the prior art.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a nanofiltration membrane and a preparation method of the nanofiltration membrane. Background technique [0002] Nanofiltration membrane separation technology is widely used in wastewater treatment, biopharmaceutical and petrochemical industries. The co-coating method or the layer-by-layer self-assembly method is a commonly used method for preparing nanofiltration membranes. In the process of co-coating membranes, the two monomers are dissolved in the same solution, and then the base membrane is soaked in the mixed solution. deposition. The coating thickness of the nanofiltration membrane prepared by this co-coating method is difficult to control, resulting in large flux fluctuations of the nanofiltration membrane. The raw material for the common layer-by-layer self-assembly to prepare nanofiltration membranes is polyelectrolyte. The driving force of the self-assem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/42B01D71/68B01D71/64
CPCB01D61/027B01D67/0093B01D69/02B01D71/42B01D71/64B01D71/68B01D2325/36
Inventor 林红军徐艳超郭冬雪周庆丰
Owner ZHEJIANG NORMAL UNIVERSITY
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