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.
CN112452164APending Publication Date: 2021-03-09HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2021-03-09

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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.
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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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