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Method for preparing nanometer filter membrane using irradiating surface and copolymerized grafting technology

A technology of nanofiltration membrane and irradiation, applied in the field of nanofiltration membrane

Inactive Publication Date: 2006-07-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And it is suitable for some monomers that cannot be homopolymerized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The ultrafiltration membrane used in this example is prepared by a phase inversion method using polyether ketone resin (PEK-C) containing phenolphthalein group, and the molecular weight cut off of the membrane is 10,000.

[0023] Surface graft polymerization was carried out in a tetrafluoroethylene circular reactor with a diameter of 5 cm. The ultrafiltration membrane was installed in the reactor with the membrane face up, and then the comonomer solution was added to a height of about 5 mm on the surface of the membrane. The reactor is placed directly under the straight ultraviolet lamp source, and the power of the ultraviolet lamp is 300W. The distance between the reactor and the ultraviolet light source is 5 cm.

[0024] The monomer solution used in this embodiment is a mixed solution of sodium allyl sulfonate (SAS) and acrylic acid (AA), and the molar ratio is n SAS / n AA =2. The total mass concentration of the two monomers is 10%. The irradiation time is 10min...

Embodiment 2

[0026] According to the conditions of Example 1, a PEK-C ultrafiltration membrane with a molecular weight cut off of 70,000 was used. The irradiation distance is 7cm, the monomer solution is a mixed solution of N-vinylpyrrolidone (NVP) and hydroxyethyl methacrylate (HEMA), and the molar ratio is n HEMA / n NVP =3, the total mass concentration of the two monomers is 15%. The irradiation time is 20min.

[0027] The pure water flux of the obtained NVP and HEMA modified PEK-C nanofiltration membrane under the pressure of 0.8MPa is 14.2L / m 2 h, for 0.1% NaCl and Na 2 SO 4 The water flux of the solution is 11.8L / m 2 h and 10.9L / m 2 h, the rejection rates of the above two salts were 33% and 80.5%, respectively.

Embodiment 3

[0029] According to the conditions of Example 1, a PEK-C ultrafiltration membrane with a molecular weight cut-off of 30,000 was used. The UV lamp power is 500W. The irradiation distance is 7cm, the monomer solution is a mixed solution of sodium allyl sulfonate (SAS) and acrylamide (AM), and the molar ratio is n SAS / n AM =2. The total mass concentration of the two monomers is 5%. The irradiation time is 5min.

[0030] The obtained SAS-AM modified PEKC nanofiltration membrane has a pure water flux of 23.6L / m under a pressure of 0.8MPa 2 h, for 0.1% NaCl and Na 2 SO 4 The water flux of the solution is 21.4L / m 2 h and 19.74L / m 2 h, the rejection rates of the above two salts are 60.5% and 96.2%, respectively.

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Abstract

The invention discloses a making method of hydrophilic nanometer filter membrane, which is characterized by the following: the basement membrane is an optically active polymer ultrafilter membrane, which introduces at least two strong polarity hydrophilic monomers in the photosensitizer or non-photosensitizer condition through irradiation copolymerization grafting method; the nanometer filter membrane displays good hydrophilicity, which possesses high interception rate and effusion flux for II-valence ion.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and in particular relates to a method for preparing nanofiltration membranes through surface copolymerization and grafting technology. In the present invention, monomers with different properties are selected for surface copolymerization and grafting, so that the surface properties of the membrane can be changed in a wide range, so as to be suitable for different separation systems. The invention has the characteristics of simple operation, controllable reaction and the like. Background technique [0002] Nanofiltration membrane is a membrane separation technology that has developed rapidly in recent years, and has been widely used in water treatment and separation of compounds with relatively small molecular weights. The methods for preparing nanofiltration membranes in industry mainly include interfacial polycondensation method and phase transition method. Although these meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78
Inventor 平郑骅邱长泉佘振张明刚
Owner FUDAN UNIV
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