Modified semi-aromatic polyamide membrane and preparation method thereof

A technology of aromatic polyamide membrane and semi-aromatic polyamide, which is applied in the field of modified semi-aromatic polyamide membrane and its preparation, can solve the problems of poor salt interception effect, hindering industrial implementation, and poor selectivity of semi-aromatic polyamide membrane. Achieve easy handling, enhanced electrostatic interaction, and outstanding anti-pollution properties

Inactive Publication Date: 2018-08-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the semi-aromatic polyamide membrane has poor selectivity and poor salt interception effect.
At the same time, issues related to pollution have also hindered its further advancement in industrial implementation.

Method used

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  • Modified semi-aromatic polyamide membrane and preparation method thereof
  • Modified semi-aromatic polyamide membrane and preparation method thereof
  • Modified semi-aromatic polyamide membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation method of modified semi-aromatic polyamide membrane as above, comprises the following steps:

[0044] 1. Dissolve graphene oxide nanosheets in water, disperse them by ultrasonication for 20 minutes to form a 0.1% graphene oxide stock solution, and soak the polysulfone ultrafiltration membrane in deionized water for 24 hours for later use.

[0045] 2. Adding different amounts of graphene oxide into 0.02 g / mL piperazine aqueous solution to obtain graphene oxide-containing piperazine aqueous phase solution with a ratio of 0.004 wt % graphene oxide.

[0046] 3. Pour the piperazine aqueous phase solution containing graphene oxide onto the surface of the polysulfone ultrafiltration membrane, take it out after immersion for 2 minutes, and remove the excess solution on the membrane surface with a rubber roller.

[0047] 4. After drying in air for 1 min, pour the n-hexane solution dissolved with 0.001 g / mL trimesoyl chloride onto the membrane and keep it fo...

Embodiment 2

[0051] Adopt the same preparation method as Example 1, the difference is that: in the piperazine aqueous phase solution containing graphene oxide, the mass fraction of graphene oxide is 0.008wt%, the modified semi-aromatic polyamide film finally obtained Make PA / GO-8.

Embodiment 3

[0053] Adopt the same preparation method as Example 1, the difference is: in the piperazine aqueous phase solution containing graphene oxide, the mass fraction of graphene oxide is 0.016wt%, the modified semi-aromatic polyamide film finally obtained Make PA / GO-16.

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Abstract

The invention relates to a modified semi-aromatic polyamide membrane and a preparation method thereof. The modified semi-aromatic polyamide membrane includes the steps: (1) placing graphene oxide intowater, ultrasonically dispersing the graphene oxide in the water to obtain graphene oxide stock solution, and adding the graphene oxide stock solution into piperazine aqueous solution to obtain piperazine aqueous phase solution containing the graphene oxide; (2) soaking a polysulfone ultrafiltration membrane into the piperazine aqueous phase solution containing the graphene oxide, taking out thepolysulfone ultrafiltration membrane without excessive piperazine aqueous phase solution containing the graphene oxide on the surface of the polysulfone ultrafiltration membrane, soaking the taken outpolysulfone ultrafiltration membrane into normal hexane solution of trimesoyl chloride, and reacting mixture to form a semi-aromatic polyamide active layer to obtain an initial membrane; (3) flushingthe initial membrane, soaking the initial membrane into sodium carbonate solution, and taking out and drying the initial membrane to obtain the modified semi-aromatic polyamide membrane. Compared with the prior art, a prepared product has the advantages of high salt intercepting ability and selectivity and good pollution resistance.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a modified semi-aromatic polyamide membrane and a preparation method thereof. Background technique [0002] Polyamide (PA) composite membrane is a typical thin film composite membrane material, and its structure can generally be divided into three layers: non-woven fabric layer, microporous support layer, and selective polyamide thin layer prepared by interfacial polymerization. This type of membrane is widely used in the water treatment industry as a material with stable flux, high selectivity and acid and alkali resistance, and has been widely used in nanofiltration (NF) and reverse osmosis (RO) processes. Medium and trace organic pollutants showed a high removal effect. At present, the most mainstream composite nanofiltration membrane type in the market is mainly aromatic polyamide nanofiltration membrane, which has the advantages of high flux, high desalination rate,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/10B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/10B01D71/56B01D2325/36
Inventor 梁心怡夏圣骥
Owner TONGJI UNIV
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