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Polymer/inorganic nanometer composite separation membrane and preparation method thereof

An inorganic nanometer and separation membrane technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as structural defects in the membrane, easy agglomeration of nanomaterials, poor selectivity, etc., and achieve simple preparation process operation Ease of operation, increased selectivity and transmittance, and controllable orientation of nanomaterials

Inactive Publication Date: 2011-03-09
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanomaterials have high specific surface area and high surface potential, which are expected to solve the problems of low flux, easy clogging and poor selectivity of traditional polymer separation membranes.
However, the existing preparation methods of polymer / inorganic nanomaterial composite films, such as direct mixing method, online polymerization method and sol-gel method, etc., the nanomaterials are disordered and randomly arranged in the polymer matrix, and the nanomaterials Agglomeration is easy to occur, resulting in a large number of defects in the membrane structure, and the disordered arrangement of nanomaterials also limits the improvement of membrane separation performance

Method used

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  • Polymer/inorganic nanometer composite separation membrane and preparation method thereof
  • Polymer/inorganic nanometer composite separation membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Weigh poly(amide-imide) (PAI) and dissolve it in N-methylpyrrolidone (NMP) to prepare a 200 mg / ml solution, labeled as A; weigh graphene oxide (GO), and ultrasonically disperse it into NMP, A 1.2 mg / ml solution was prepared and labeled as B. Measure 0.25ml of A and 0.25ml of B to mix, sonicate for 20min, stir mechanically for 1h, then transfer the mixed solution to the surface of a glass substrate with an applied electric field for film formation. The direction of the applied electric field is perpendicular to the surface of the glass substrate. The electric field strength is 100v / mm. After the composite film is basically dried, put it in an oven to dry at 150°C for 1 hour to obtain the finished polymer / inorganic nanocomposite film. The orientation of the graphene oxide in this finished product is perpendicular to the plane of the film.

Embodiment 2

[0036] Weigh poly(amide-imide) (PAI) and dissolve it in N-methylpyrrolidone (NMP) to prepare a 100 mg / ml solution, labeled A; weigh graphene oxide (GO), and ultrasonically disperse it into NMP, A 0.2 mg / ml solution was prepared and marked as B. Measure 0.25ml of A and 0.25ml of B to mix, sonicate for 20min, stir mechanically for 1h, then transfer the mixed solution to the surface of a glass substrate with an applied electric field for film formation. The direction of the applied electric field is parallel to the surface of the glass substrate. The electric field strength is 150v / mm. After the composite film is basically dried, put it in an oven to dry at 150°C for 1 hour to obtain the finished polymer / inorganic nanocomposite film. The orientation of the graphene oxide in this finished product is parallel to the film plane.

Embodiment 3

[0038] Weigh polyvinylidene fluoride (PVDF) and dissolve it in N-methylpyrrolidone (NMP) to prepare a 200 mg / ml solution, marked as A; weigh multi-walled carbon nanotubes (CNTs), and ultrasonically disperse them evenly in NMP to prepare 1.2 mg / ml solution, labeled B. Measure 0.25ml of A and 0.25ml of B to mix, sonicate for 20min, stir mechanically for 1h, then transfer the mixed solution to the surface of a glass substrate with an applied electric field for film formation. The direction of the applied electric field is perpendicular to the surface of the glass substrate. The electric field strength is 50v / mm. After the composite film is dried, the finished polymer / inorganic nanocomposite film is obtained. The orientation of the carbon nanotubes in the finished product is perpendicular to the plane of the film.

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Abstract

The invention relates to a polymer / inorganic nanometer composite separation membrane and a preparation method thereof. The composite separation membrane consists of a solid matrix of polymer materials and conductive nanomaterials uniformly distributed in the above matrix according to a certain orientation. In the preparation method, conductive nanomaterials which can be arrayed in a certain orientation are uniformly distributed in a film-forming macromolecular material solution. Then electric field is applied during the film-formation process of the mixed solution. The conductive nanomaterials are aligned to the direction of electric field in the film to form the polymer / inorganic nanometer composite separation membrane. The separation membrane has a greater area and smooth surface, controllable film thickness and strength, steerable nanomaterial density and orientation, good selectivity, high transmittance for selected gas and liquid molecules. The method of the invention has the characteristics of simple preparation, easy operation and low cost. The invention can be widely used in the fields of large-scale isolation and purification of gas and large-scale filtration and separation of liquid.

Description

technical field [0001] The invention particularly relates to a polymer / inorganic nanocomposite separation membrane and a preparation process thereof in the technical field of material preparation. Background technique [0002] Due to its high efficiency, low cost, and no secondary pollution, membrane separation technology has aroused widespread interest and has been applied in the fields of gas separation and purification, biomacromolecule separation, sewage purification, seawater desalination, petrochemical and coal chemical industries. However, the polymer separation membranes prepared by traditional methods, according to Robesen’s theory, have the defect of contradictory selectivity and transmittance, and it is difficult to achieve the simultaneous increase of selectivity and transmittance, which makes the polymer separation membranes in the actual use process low efficiency. Therefore, there is an urgent need to develop separation membranes that can simultaneously impro...

Claims

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Application Information

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IPC IPC(8): B01D71/08B01D69/12B01D67/00
Inventor 靳健张文彬王栋
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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