Two-step modified composite nanofiltration membrane containing cellulose nanocrystal intermediate layer and dopamine in-situ modified layer and preparation method thereof

A composite nanofiltration membrane and nanocrystal technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to reduce membrane fouling problems, improve permeability, and enhance adhesion.

Pending Publication Date: 2021-03-09
HARBIN INST OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem of mutual checks and balances between the permeability and interception performance of the existing nanofiltration membranes,

Method used

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  • Two-step modified composite nanofiltration membrane containing cellulose nanocrystal intermediate layer and dopamine in-situ modified layer and preparation method thereof
  • Two-step modified composite nanofiltration membrane containing cellulose nanocrystal intermediate layer and dopamine in-situ modified layer and preparation method thereof
  • Two-step modified composite nanofiltration membrane containing cellulose nanocrystal intermediate layer and dopamine in-situ modified layer and preparation method thereof

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Example Embodiment

[0044]DETAILED DESCRIPTION OF THE INVENTION First: The two-step modified composite nanofiltration membrane having a cellulose-containing nanocrystalline intermediate layer and a dopaine in situ modified layer is a four-layer structure, and the bottom-up is sequentially microstructure under layer, fiber. Suner's nanocrystalline intermediate layer, polyamide separation layer, and dopamine modification layer; the material of the microfiltration membrane is a polyether sulfone polymer having a film aperture of 0.22 μm.

[0045]The method of preparing a two-step modified composite nanofiltration membrane containing a cellulose-containing nanocrystalline intermediate layer and a polyamine in situ modified layer is carried out in accordance with the following steps:

[0046]Step 1, a 40 mg length of 100 nm ~ 300 nm is ultrasonically dispersed in 1 L of water, and the ultrasonic time is 30 min, and a cellulose nanocrystalline dispersion of a concentration of 40 mg / L is obtained;

[0047]Step 2, 10...

Example Embodiment

[0053]DETAILED DESCRIPTION OF THE INVENTION The present embodiment is different from the specific embodiment: the concentration of dopamine in the dopamine mixed solution in step four is 4.8 g / L. Other steps and parameters are identical to those of the specific embodiments.

Example Embodiment

[0054]DETAILED DESCRIPTION OF THE INVENTION The present embodiment is different from that of the particular embodiment: the concentration of dopamine in the dopamine mixed solution in step four is 3.2 g / L. Other steps and parameters are identical to those of the specific embodiments.

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Abstract

The invention discloses a two-step modified composite nanofiltration membrane containing a cellulose nanocrystal intermediate layer and a dopamine in-situ modified layer and a preparation method thereof. The invention belongs to the field of membrane materials and preparation thereof. The invention aims to solve the technical problem that the permeability and interception performance of the existing nanofiltration membrane are mutually balanced. The two-step modified composite nanofiltration membrane containing the cellulose nanocrystal middle layer and the dopamine in-situ modified layer is of a four-layer structure and sequentially comprises a microfiltration membrane bottom layer, a cellulose nanocrystal middle layer, a polyamide separation layer and a dopamine modified layer from bottom to top. The method comprises the following steps: carrying out suction filtration on a cellulose nanocrystal dispersion liquid to the surface of the bottom layer of the microfiltration membrane, then sequentially soaking in a piperazine solution and a trimesoyl chloride solution, taking out, carrying out heat treatment, and finally soaking in a dopamine mixed solution to obtain the composite nanofiltration membrane. According to the method, the permeability of the nanofiltration membrane is greatly improved, and meanwhile, the interception performance of the nanofiltration membrane can be improved to a certain extent.

Description

technical field [0001] The invention belongs to the field of membrane materials and their preparation, in particular to a two-step modified composite nanofiltration membrane containing a cellulose nanocrystal intermediate layer and a dopamine in-situ modification layer and a preparation method thereof. Background technique [0002] The physical and chemical properties of nanofiltration membranes are between ultrafiltration and reverse osmosis, and the interception performance for small molecule organics and salts is also between the two. Compared with reverse osmosis, nanofiltration can still have a relatively low pressure. High desalination efficiency. Since the concept of nanofiltration was first proposed in 1984, it has developed rapidly in the field of water treatment. The commonly used preparation methods of nanofiltration membranes include interfacial polymerization, layer-by-layer self-assembly, and phase inversion. Among them, interfacial polymerization is the most...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00
CPCB01D69/12B01D67/0002
Inventor 白朗明丁俊文梁恒刘子涵王紫张盟李圭白
Owner HARBIN INST OF TECH
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