Preparation method of superhydrophilic/superhydrophobic composite nanofiltration membrane

A composite nanofiltration membrane, super-hydrophobic technology, applied in the field of membrane separation, can solve the problems of no super-hydrophilic/super-hydrophobic, single function, etc., achieve good organic solvent resistance nanofiltration effect, wide source, high retention rate Effect

Active Publication Date: 2015-07-08
陕西禹慧智通环保科技有限公司
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Problems solved by technology

[0003] The above methods are all for the preparation of super-hydrophilic or super-hydrophobic films with a single function. There are no reports on the simultaneous realization of super-hydrophilic / super-hydrophobic on the same substrate, and the prepared super-hydrophilic / super-hydrophobic films are used for nanofiltration membranes. There is no relevant report on the separation system

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  • Preparation method of superhydrophilic/superhydrophobic composite nanofiltration membrane
  • Preparation method of superhydrophilic/superhydrophobic composite nanofiltration membrane
  • Preparation method of superhydrophilic/superhydrophobic composite nanofiltration membrane

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Embodiment 1

[0029] An organic-inorganic composite nanofiltration membrane with superhydrophilicity and superhydrophobicity and a preparation method thereof, comprising the following steps:

[0030] (1) Take the polyvinylidene fluoride ultrafiltration membrane as the base membrane, treat it with 4mol / L sodium hydroxide alkali solution at 50°C for 40min, and rinse the membrane surface with deionized water until the pH is neutral; (2) The pretreated polyvinylidene fluoride-based membrane was immersed in 8g / L polydimethyldiallylammonium chloride polyelectrolyte solution, and was taken out after 30min, and the excess polyelectrolyte on the membrane surface was rinsed with deionized water; (3) ( 2) Immerse the membrane in 4g / L sodium polystyrene sulfonate polyelectrolyte solution, take it out after 30min, and rinse the excess polyelectrolyte on the surface of the membrane with deionized water; (4) Repeat steps (2) and (3) to assemble twice , to obtain a dense pre-separation layer; (5) immerse t...

Embodiment 2

[0033] An organic-inorganic composite nanofiltration membrane with superhydrophilicity and superhydrophobicity and a preparation method thereof, comprising the following steps:

[0034] (1) Use polysulfone ultrafiltration membrane as the base membrane, treat it with 2mol / L sodium hydroxide lye at 30°C for 80min, wash the membrane surface with deionized water until the pH is neutral; (2) pretreat The final polysulfone-based membrane is immersed in 4g / L polyvinylamine polyelectrolyte solution, taken out after 60min, and the excess polyelectrolyte on the surface of the membrane is rinsed with deionized water; (3) The membrane of (2) is immersed in 1g / L seaweed Sodium acid polyelectrolyte solution, take it out after 60min, and rinse the excess polyelectrolyte on the surface of the membrane with deionized water; (4) Repeat steps (2), (3) to assemble twice to obtain a dense pre-separation layer; (5) ( 4) Immerse the membrane in 4g / L polyvinylamine polyelectrolyte solution containing...

Embodiment 3

[0037] An organic-inorganic composite nanofiltration membrane with superhydrophilicity and superhydrophobicity and a preparation method thereof, comprising the following steps:

[0038] (1) Take the polyacrylonitrile ultrafiltration membrane as the base membrane, treat it with 3mol / L sodium hydroxide alkali solution at 40°C for 60min, wash the membrane surface with deionized water until the pH is neutral; The treated polyacrylonitrile-based membrane was immersed in 5g / L polyethyleneimine polyelectrolyte solution, taken out after 40min, and the excess polyelectrolyte on the surface of the membrane was rinsed with deionized water; (3) the membrane of (2) was immersed in 1g / L polyelectrolyte solution. sodium acrylate polyelectrolyte solution, take it out after 40min, and rinse the excess polyelectrolyte on the surface of the membrane with deionized water; (4) repeat steps (2), (3) to assemble twice to obtain a dense pre-separation layer; (5) ( 4) The membrane is immersed in 5g / L ...

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Abstract

The invention relates to a preparation method of a superhydrophilic / superhydrophobic composite nanofiltration membrane, belonging to the technical field of membrane separation. The preparation method comprises the following steps: putting a pretreated base membrane in a polycation electrolyte solution, washing with water, putting in a polyanion electrolyte solution, washing with water, and alternately assembling many times to form a predissociation layer; putting the membrane containing the predissociation layer in a soluble calcium salt polycation electrolyte solution, taking out, washing with water, putting in a soluble-silicate-containing polyanion electrolyte solution, taking out, washing with water, and repeating many times to obtain a polyelectrolyte / calcium silicate hydrate superhydrophilic composite nanofiltration membrane; and putting the superhydrophilic membrane in a fluorosilane ethanol water solution, immersing for 40-90 minutes, flushing with deionized water, and drying and solidifying in a drying oven. The superhydrophilic nanofiltration membrane can implement entrapping separation on the water-soluble dye molecules, and the superhydrophobic nanofiltration membrane can implement entrapping separation on organic solvent dye molecules.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophilic / superhydrophobic composite nanofiltration membrane, in particular to a preparation method of a superhydrophilic nanofiltration membrane and a superhydrophobic organic solvent-resistant nanofiltration membrane. Membrane separation technology field. Background technique: [0002] In recent years, superhydrophilic and superhydrophobic surfaces, as a very special phenomenon, have received extensive attention. A super-hydrophilic surface refers to a surface with a contact angle of less than 5° with water. It has excellent performance and a wide range of applications. It can be self-cleaning, anti-fog, and improve surface heat exchange efficiency. Superhydrophobic surface generally refers to the surface with a contact angle of >150° with water, which has extremely broad application prospects in industrial and agricultural production and people's daily life. The preparation of such super...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/42B01D71/34B01D71/02B01D69/12B01D67/00
Inventor 郭红霞马益文崔素萍王子明秦振平曾庭英
Owner 陕西禹慧智通环保科技有限公司
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