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Preparation method for in situ self-assembled organic/inorganic hybrid membrane based on coordination

A technology of self-assembly and hybrid membrane, which is applied in the field of membrane separation, can solve problems such as agglomeration, loss of inorganic nanoparticles, and poor dispersion of inorganic nanoparticles, and achieve improved solvent resistance and pollution resistance, improved performance, and increased ratio The effect of surface area

Active Publication Date: 2013-09-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hybrid membrane prepared by this method is prone to uneven distribution and agglomeration of nanoparticles, which leads to the instability of the performance of the hybrid membrane, and the loss of inorganic nanoparticles due to the compatibility of the organic and inorganic phases.
The invention provides a novel in-situ self-assembly method for organic / inorganic hybrid membranes, which can grow nanoparticles in situ during the preparation of composite membranes, which better solves the disadvantage of poor dispersion of inorganic nanoparticles, and utilizes organic The electrostatic interaction and coordination between the polymer and the inorganic nanoparticles improve the compatibility between the organic phase and the inorganic phase, thereby improving the separation performance and stability of the hybrid membrane, which has important scientific value and application prospects

Method used

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  • Preparation method for in situ self-assembled organic/inorganic hybrid membrane based on coordination
  • Preparation method for in situ self-assembled organic/inorganic hybrid membrane based on coordination
  • Preparation method for in situ self-assembled organic/inorganic hybrid membrane based on coordination

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Experimental program
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Effect test

Embodiment 1

[0028] The base membrane is polyacrylonitrile (PAN) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​20cm 2 , the polyelectrolyte used is polystyrene sulfonate sodium (PSS, with a molecular weight of 1 million); the metal ion is zinc nitrate hexahydrate (Zn(NO 3 )·6H 2 O, the molecular weight is 297.49); the organic ligand is 2-methylimidazole (C 4 h 6 N 2 , with a molecular weight of 82.10). The solvents of zinc nitrate hexahydrate and 2-methylimidazole are methanol, and the solvent of sodium polystyrene sulfonate is water.

[0029] Assembly conditions and methods:

[0030] (1) Use deionized water to make sodium polystyrene sulfonate into 500ml of a 3wt% solution, and let it stand for degassing; use methanol to make 500ml of a 0.05mol / L solution of zinc nitrate hexahydrate, and let it stand for degassing; Make 2-methylimidazole into 500ml of 0.4mol / L solution with methanol, let it stand for defoaming;

[0031]...

Embodiment 2

[0041] The base membrane is polyacrylonitrile (PAN) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​20cm 2, the polyelectrolyte used is polystyrene sulfonate sodium (PSS, with a molecular weight of 1 million); the metal ion is zinc nitrate hexahydrate (Zn(NO 3 )·6H 2 O, the molecular weight is 297.49); the organic ligand is 2-methylimidazole (C 4 h 6 N 2 , with a molecular weight of 82.10). The solvents of zinc nitrate hexahydrate and 2-methylimidazole are methanol, and the solvent of sodium polystyrene sulfonate is water.

[0042] Assembly conditions and methods:

[0043] (1) Make sodium polystyrene sulfonate into 500ml of a 0.3wt% solution with deionized water, and let it stand for defoaming; make zinc nitrate hexahydrate into 500ml of a 0.05mol / L solution with methanol, let it stand for defoaming; Make 2-methylimidazole into 500ml of a 0.4mol / L solution with methanol, and let it stand for defoaming.

[0044...

Embodiment 3

[0055] The base membrane is polyacrylonitrile (PAN) material, a flat ultrafiltration membrane with a molecular weight cut-off of 20,000 and a membrane area of ​​20cm 2 , the polyelectrolyte used is polystyrene sulfonate sodium (PSS, with a molecular weight of 1 million); the metal ion is zinc nitrate hexahydrate (Zn(NO 3 )·6H 2 O, the molecular weight is 297.49); the organic ligand is 2-methylimidazole (C 4 h 6 N 2 , with a molecular weight of 82.10). The solvents of zinc nitrate hexahydrate and 2-methylimidazole are methanol, and the solvent of sodium polystyrene sulfonate is water.

[0056] Assembly conditions and methods:

[0057] (1) Make sodium polystyrene sulfonate into 500ml of a 0.3wt% solution with deionized water, and let it stand for defoaming; make zinc nitrate hexahydrate into 500ml of a 0.5mol / L solution with methanol, let it stand for defoaming; Make 2-methylimidazole into 500ml of 4mol / L solution with methanol, let stand for defoaming;

[0058] (2) In or...

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Abstract

The invention provides a preparation method for an in situ self-assembled organic / inorganic hybrid membrane based on coordination, and belongs to the technical field of membrane separation. The method provided by the invention comprises the following steps: preprocessing the organic porous membrane and enabling the surface of which to be charged; preparing membrane casting solution by dissolving metal ion, organic ligand and polymer in a solution, and carrying out standing of the membrane casting solution for deaeration; conducting dynamic filtering or static deposition of the membrane casting solution on the surface of the organic porous membrane in an alternating manner for a period of time, so as to enable the metal ion and the organic ligand to generate hybrid particle on the surface of the membrane through the layer upon layer self-assembly method in the presence of polyelectrolyte, and forming an ultra-thin separation layer which is uniform in dispersity, high in loading capacity, and can realize molecular hybridization. The invention provides a novel preparation method for the organic / inorganic hybrid membrane, and nanofiltration membrane prepared by the method is provided with the advantages of high reject rate, big flux and the like, and the method can be widely used in the filed of water processing.

Description

technical field [0001] The invention relates to a preparation method of an in-situ self-assembled organic / inorganic hybrid membrane based on coordination, which is used for dye removal and belongs to the technical field of membrane separation. Background technique [0002] Membrane separation, as a new type of separation technology, has the characteristics of simple operation, low energy consumption, good separation effect, and no secondary pollution, and has attracted more and more attention. The property of the membrane material is one of the key factors affecting the separation effect of the membrane. The organic / inorganic hybrid membrane combines organic polymers and inorganic materials to give full play to their respective advantages, and has a wide range of applications in the preparation of composite membranes. Studies have shown that organic membranes doped with inorganic nanoparticles have different degrees of improvement in separation effect and stability. The com...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D71/02B01D69/12B01D67/00
Inventor 纪树兰张蓉李建荣张达王乃鑫汪林
Owner BEIJING UNIV OF TECH
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