Method for preparing nanofiltration membrane by adopting layer-by-layer self-assembly method

A layer-by-layer self-assembly, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of energy consumption, good retention performance, significant application prospects

Active Publication Date: 2015-12-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the nanofiltration membrane prepared by the existing method cannot have good interception performance and high water flux at the same time, and provides a method for preparing nanofiltration membrane by layer-by-layer self-assembly method

Method used

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specific Embodiment approach 1

[0013] Specific embodiment one: present embodiment a kind of method for preparing nanofiltration membrane by self-assembly method layer by layer, comprising the following steps:

[0014] One, solvent, pore-forming agent and polyacrylonitrile are mixed, make polyacrylonitrile solution;

[0015] 2. Utilize the immersion-precipitation phase inversion method to make the polyacrylonitrile solution into an ultrafiltration base membrane, wash with deionized water for 3 to 5 times, and obtain a polyacrylonitrile base membrane;

[0016] 3. Put the polyacrylonitrile-based membrane in sodium hydroxide solution and react at 20°C-50°C for 20min-60min. After the reaction, take out the polyacrylonitrile-based membrane and soak it in deionized water for 0.5-2h , and then immersed in hydrochloric acid solution for 1 to 5 hours to obtain the treated polyacrylonitrile-based membrane;

[0017] 4. Immerse the polyacrylonitrile-based membrane treated in step 3 in the polyethyleneimine solution for...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the solvent in Step 1 is N-methylpyrrolidone. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the pore-forming agent in step 1 is polyethylene glycol or polyvinylpyrrolidone. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a nanofiltration membrane by adopting a layer-by-layer self-assembly method, and relates to a preparation method of a nanofiltration membrane, aiming at solving the problems that a nanofiltration membrane prepared by adopting an existing method cannot have both good interception performance and high water flux. The method comprises the following steps: preparing a polyacrylonitrile solution, preparing a polyacrylonitrile basilar membrane, preparing a treated polyacrylonitrile basilar membrane, assembling a layer of polyethlenimine, assembling a layer of graphene oxide, and reassembling polyethlenimine and graphene oxide, thus obtaining the nanofiltration membrane. According to the method disclosed by the invention, a layer-by-layer self-assembly method is adopted, polyethlenimine and graphene oxide are adopted for modifying a PAN membrane, so that the hydrophilia and the pore size of the surface of the membrane are effectively adjusted; because the membrane is relatively thin, relatively large flux can be obtained, and the obtained nanofiltration membrane has good interception performance. The method can be applied to the fields of antibiotics separating, fruit juice concentrating and seawater desalting.

Description

technical field [0001] The invention relates to a preparation method of a nanofiltration membrane. Background technique [0002] Due to the depletion of fresh water resources, seawater desalination technology is getting more and more attention. Among them, membrane separation technology, especially new membrane separation technology, is attracting widespread attention from scientists. [0003] Nanofiltration began in the mid-to-late 1980s and is a new pressure-driven physical separation process without phase change. The pore size of the nanofiltration membrane is smaller than that of the ultrafiltration membrane and larger than that of the reverse osmosis membrane. Nanofiltration membrane is characterized by its high rejection rate for divalent and multivalent ions, while the rejection rate for monovalent ions is relatively low, and its cut-off molecular weight is between 200-1000g·mol -1 . Therefore, the nanofiltration process is widely used in industrial fields such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 邵路张聪程喜全钟永智
Owner HARBIN INST OF TECH
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