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Modified wholly aromatic polyamide membrane and preparation method thereof

An aromatic polyamide membrane and a technology of wholly aromatic polyamide, which are applied in the field of alkene-modified wholly aromatic polyamide membrane and its preparation, can solve the problem of low water flux and energy efficiency, flux and anti-pollution performance need to be improved, popularized and applied Obstacles and other problems, to achieve the effect of improving the surface morphology, the preparation method is simple and feasible, and the ionic strength and organic pollution are small.

Inactive Publication Date: 2018-09-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the current pressure-driven commercial membranes are hydrophobic, with strong mechanical stability, thermal and chemical stability, but the flux and anti-fouling performance still need to be improved.
The emergence of membrane fouling, relatively low water flux and energy efficiency of polyamide composite membranes in the water purification process have hindered their popularization and application in water treatment.

Method used

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  • Modified wholly aromatic polyamide membrane and preparation method thereof
  • Modified wholly aromatic polyamide membrane and preparation method thereof
  • Modified wholly aromatic polyamide membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method for the above modified wholly aromatic polyamide film, comprising the following steps:

[0049]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.

[0050] 2. Adding different amounts of graphene oxide into 0.02 g / mL m-phenylenediamine aqueous solution to obtain a graphene oxide-containing m-phenylenediamine aqueous phase solution with a ratio of 0.004 wt % graphene oxide.

[0051] 3. Pour the m-phenylenediamine 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.

[0052] 4. After drying in air for 1 min, pour the n-hexane solution dissolved with 0.001 g / mL trimesoyl chloride onto the membr...

Embodiment 2

[0056] Using the same preparation method as in Example 1, the difference is that: in the m-phenylenediamine aqueous phase solution containing graphene oxide, the mass fraction of graphene oxide is 0.008wt%, and the finally obtained modified wholly aromatic polyamide The membrane is designated as 8-GO-TFC.

Embodiment 3

[0058] Using the same preparation method as in Example 1, the difference is that: in the m-phenylenediamine aqueous phase solution containing graphene oxide, the mass fraction of graphene oxide is 0.016wt%, and the finally obtained modified wholly aromatic polyamide The membrane is designated as 16-GO-TFC.

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Abstract

The invention relates to a modified wholly aromatic polyamide membrane and preparation thereof. The preparation method comprises the following steps: (1) placing graphene oxide in water, carrying outultrasonic dispersion to obtain a graphene oxide stock solution, and adding the graphene oxide stock solution in a m-phenylenediamine aqueous solution to obtain a m-phenylenediamine water-phase solution which contains graphene oxide; (2) dipping a polysulfone ultrafiltration membrane in the m-phenylenediamine aqueous solution which contains the graphene oxide, then taking out the polysulfone ultrafiltration membrane and removing the excessive m-phenylenediamine aqueous solution which contains the graphene oxide on the surface of the polysulfone ultrafiltration membrane, dipping the polysulfoneultrafiltration membrane in a n-hexane solution of trimesoyl chloride, and reacting to form a wholly aromatic polyamide active layer to obtain an initial membrane; and (3) washing the initial membrane, soaking the initial membrane in a sodium carbonate solution, and finally taking out the initial membrane and drying the initial membrane to obtain the modified wholly aromatic polyamide membrane. Compared with the prior art, the modified wholly aromatic polyamide membrane is good in hydrophilic performance, large in membrane flux and high in pollution resistance.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an alkene-modified fully 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 desalinat...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/68C02F1/44
CPCB01D67/0083B01D67/0088B01D69/12B01D71/68B01D2321/28C02F1/444
Inventor 梁心怡夏圣骥
Owner TONGJI UNIV
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