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Inorganic/organic composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane, organic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of uneven dispersion, unstable membrane performance, etc. The effect of good separation

Active Publication Date: 2012-07-11
中科瑞阳膜技术(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 101905125 A uses the spray gel method to compound polystyrene sulfonate and polyethyleneimine polyelectrolyte solution containing glutaraldehyde on the support membrane, and after acidification, it forms a composite membrane with a cross-linked structure. Improve its structural stability; organic-inorganic composites have the advantages of both organic and inorganic substances. Patent CN 101890315 A loads carbon nanotubes into the functional skin of aromatic polymers to obtain a composite nanofiltration membrane with good performance; patent CN 102151490 A Dendritic polyamide is used to embed inorganic nanoparticles and cross-link to obtain a composite membrane containing inorganic nanoparticles, which improves the separation efficiency of the membrane; this introduction of inorganic particles into the polymer improves the performance of the membrane to a certain extent. , which improves the stability of the film, but the agglomeration of inorganic particles makes its dispersion in organic matter uneven, resulting in unstable performance of the film

Method used

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  • Inorganic/organic composite nanofiltration membrane and preparation method thereof
  • Inorganic/organic composite nanofiltration membrane and preparation method thereof
  • Inorganic/organic composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0023] The preparation method of the above inorganic / organic composite nanofiltration membrane, such as figure 2 As shown, the following steps are included: 1) base film pretreatment; 2) self-assembly to form a transition layer; 3) in-situ generation of a composite layer; 4) formation of a surface dense layer.

[0024] It is achieved through the following specific schemes:

[0025] 1) Pretreatment of the base membrane: Take the ultrafiltration membrane as the base membrane, treat the base membrane with 0.5-4.0 mol / L sodium hydroxide solution for 30-60 minutes, and then wash with deionized water to neutrality.

[0026] 2) Self-assembled polyelectrolyte composite membrane transition layer on the base membrane: immerse the base membrane treated in step (1) in a cationic polyelectrolyte solution of 1.0-8.0g / L, immerse it for 10-30 minutes, and then take it out with deionized water Wash thoroughly; then transfer to 1.0-8.0g / L anionic polyelectrolyte solution, make cationic polyelectroly...

Embodiment 1

[0031] 1) Pretreatment of the base membrane: Take the polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of less than 100,000 as the base membrane, treat the base membrane with 0.5 mol / L sodium hydroxide solution for 60 minutes, and then wash it with deionized water to the middle Sex.

[0032] 2) Self-assembly on the base membrane to form the transition layer of the polyelectrolyte composite membrane: the base membrane treated in step (1) is immersed in a 1.0g / L polyethyleneimine (PEI) cationic polyelectrolyte solution, and after immersing for 30 minutes, take it out for use Rinse thoroughly with deionized water; then transfer to 1.0g / L polystyrene sodium sulfonate (PSS) anionic polyelectrolyte solution, so that the cationic polyelectrolyte and anionic polyelectrolyte will form a polyelectrolyte composite layer through electrostatic action, and then rinse thoroughly , Blow dry with high purity nitrogen;

[0033] 3) In-situ generation of inorganic nanopartic...

Embodiment 2

[0037] 1) Pretreatment of base membrane: Take polyacrylonitrile ultrafiltration membrane with a molecular weight cut-off of less than 100,000 as the base membrane, treat the base membrane with a 4.0 mol / L sodium hydroxide solution for 30 minutes, and then wash it with deionized water to the middle Sex.

[0038] 2) Self-assembly on the base membrane to form the transition layer of the polyelectrolyte composite membrane: the base membrane treated in step (1) is immersed in a 8.0g / L polyethyleneimine (PEI) cationic polyelectrolyte solution, and then immersed for 10 minutes. Rinse thoroughly with deionized water; then transfer to 8.0g / L polystyrene sodium sulfonate (PSS) anionic polyelectrolyte solution, so that the cationic polyelectrolyte and anionic polyelectrolyte will form a polyelectrolyte composite layer through electrostatic action, and then rinse thoroughly , Blow dry with high purity nitrogen;

[0039] 3) In-situ generation of inorganic nanoparticles-polyelectrolyte composit...

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Abstract

The invention belongs to the technical filed of membranes, particularly relates to an inorganic / organic composite nanofiltration membrane. The inorganic / organic composite nanofiltration membrane sequentially comprises a basement membrane, a transition layer, a composite layer and a compact layer, wherein the basement membrane is provided with an ultrafiltration membrane, the transition layer is formed on the surface of the basement membrane by cationic polyelectrolyte and anionic polyelectrolyte through electrostatic self-assembly, the composite layer is formed on the surface of the transition layer by a soluble calcium salt and a soluble carbonate in a in-situ way, and the compact layer is formed on the surface of the composite layer by the cationic polyelectrolyte and the anionic polyelectrolyte in a crosslink way. The precipitation and the in-situ formation of inorganic minerals are controlled through the identification of an inorganic matter precursor due to polyelectrolyte, thus the inorganic / organic composite nanofiltration membrane which is of a shell-simulation shape is obtained, and the inorganic / organic composite nanofiltration membrane is uniform and controllable and has a stable performance. The implementation processes are all carried out in normal temperature, an organic solvent is free, and the inorganic / organic composite nanofiltration membrane is environment friendly and has a good separating effect for Ca<2+>, Mg<2+> and dye molecules of which molecular weights are larger than 370 in water.

Description

Technical field [0001] The invention belongs to the technical field of membranes, and specifically relates to an inorganic / organic composite nanofiltration membrane imitating a shell pearl layer and a preparation method thereof. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between ultrafiltration and reverse osmosis. Its pore size is in the range of a few nanometers. It can effectively trap divalent, high-valent metal ions and organics with a molecular weight greater than 200. It has an operating pressure It has the advantages of low permeation flux, etc., and can be used in industrial wastewater treatment, biochemical preparations and medicine, petrochemical, food and other industries in brackish water desalination, printing and dyeing industries. [0003] At present, most nanofiltration membranes are prepared by covering a very thin selective separation layer on the surface of a base membrane with better strength and greater flux. ...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/00
Inventor 郭红霞耿常乐杜子昂秦振平张国俊崔素萍纪树兰
Owner 中科瑞阳膜技术(北京)有限公司
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