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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

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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  • Summary
  • Abstract
  • Description
  • Claims
  • 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, and to provide a two-step modified composite membrane containing a cellulose nanocrystal intermediate layer and a dopamine in-situ modified layer. Nanofiltration membrane and preparation method thereof

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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specific Embodiment approach 1

[0044] Specific embodiment 1: A two-step modified composite nanofiltration membrane containing a cellulose nanocrystal intermediate layer and a dopamine in-situ modification layer in this embodiment has a four-layer structure, which is the bottom layer of the microfiltration membrane and the fiber membrane from bottom to top. The material of the bottom layer of the microfiltration membrane is polyethersulfone polymer, and the membrane pore size is 0.22 μm.

[0045] The preparation method of a two-step modified composite nanofiltration membrane containing a cellulose nanocrystal intermediate layer and a dopamine in-situ modified layer of this embodiment is carried out according to the following steps:

[0046] Step 1. Ultrasonic disperse 40 mg of cellulose nanocrystals with a length of 100 nm to 300 nm in 1 L of water at 22 kHz for 30 minutes to obtain a uniformly dispersed cellulose nanocrystal dispersion with a concentration of 40 mg / L;

[0047] Step 2. Suction filter the cel...

specific Embodiment approach 2

[0053] Embodiment 2: This embodiment differs from Embodiment 1 in that: the concentration of dopamine hydrochloride in the dopamine mixed solution described in step 4 is 4.8 g / L. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0054] Embodiment 3: This embodiment differs from Embodiment 1 in that the concentration of dopamine hydrochloride in the dopamine mixed solution described in step 4 is 3.2 g / L. Other steps and parameters are the same as those in the first embodiment.

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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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