Composite membrane for water treatment

A composite membrane and water treatment technology, applied in the direction of membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of small flux, complicated process and high operation requirements

Active Publication Date: 2019-04-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, commercial nanofiltration membranes used for water treatment are mainly coated with polyamide functional layers on polysulfone membranes through interfacial polymerization. This process is relatively complicated and requires high operation requirements.
Moreover, the flux of polysulfone ultrafiltration membrane itself is small, the polyamide composite layer is very dense, and the interception efficiency is high, but the phenomenon of concentration polarization is very obvious, easy to pollute, and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Disperse 2.4g of polysulfone and 0.24g of KH-550 treated sepiolite in 17.12g of DMF, add 0.24g of TTAB to make a casting solution. Scrape to form a 200 μm film, immerse in pure water, and store in pure water until use.

Embodiment 2

[0019] Disperse 3g of polysulfone and 0.15g of KH-792 treated sepiolite in 16.7g of DMAC, add 0.15g of CTAB to make a casting solution. Scrape to form a 200 μm film, immerse in pure water, and store in pure water until use.

Embodiment 3

[0021] Disperse 3.6g of polysulfone and 0.108g of NQ-62 treated sepiolite in 16.184g of NMP, add 0.108g of DTAB to make a casting solution. Scrape to form a 200 μm film, immerse in pure water, and store in pure water until use.

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PUM

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Abstract

A composite membrane for water treatment is characterized in that sepiolite treated by coupling agents, polysulfone and surface active agents serve as membrane preparation raw materials and are mixedwith solvents according to a certain proportion to prepare casting solution, a porous support membrane is prepared by an immersion-precipitation method and coated with a separation function layer by chemical deposition reaction of polyphenol and a polyamino compound in water, and the composite membrane for water treatment is prepared. The membrane shows high rejection performance for dyes and inorganic salts.

Description

technical field [0001] The invention relates to a composite membrane for water treatment, which is characterized in that it is a composite membrane with a separation function layer prepared by a chemical deposition method. Background technique [0002] At present, commercial nanofiltration membranes used for water treatment are mainly coated with polyamide functional layers on polysulfone membranes through interfacial polymerization. This process is relatively complicated and requires high operation requirements. Moreover, the flux of the polysulfone ultrafiltration membrane itself is small, the polyamide composite layer is very dense, and the interception efficiency is high, but the phenomenon of concentration polarization is very obvious, easy to pollute, and high in energy consumption. The present invention aims at the disadvantages of the existing composite membranes. Firstly, a polysulfone supporting base membrane with large flux is prepared, and then a cross-linked sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D67/00B01D69/10B01D69/12B01D71/68
CPCB01D67/0093B01D69/10B01D69/125B01D71/68B01D71/82
Inventor 朱泽晛刘冬青蔡思洲任顺
Owner TIANJIN POLYTECHNIC UNIV
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