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Composite membrane for water treatment, and preparation method thereof

A composite membrane and polymer technology, applied in the field of membrane separation, can solve problems such as complex membrane making process, and achieve the effects of simplifying membrane making process, good anti-pollution performance, and improved permeability

Inactive Publication Date: 2017-01-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aminated cyclodextrin cannot directly react with acid chloride to form a cross-linked polyamide active layer; it can only be used for post-treatment modification of the composite membrane after the composite membrane is prepared, which makes the membrane-making process more complicated.

Method used

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  • Composite membrane for water treatment, and preparation method thereof
  • Composite membrane for water treatment, and preparation method thereof
  • Composite membrane for water treatment, and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0033] The preparation method of above-mentioned composite film is as follows:

[0034] (1) Take out the polymer support layer after being fully soaked in the aqueous phase solution, the aqueous phase solution includes cyclodextrin amino derivatives with a mass fraction of 2% to 9% and cyclodextrin amino derivatives with a mass fraction of 0.5% to 2%. A catalyst (such as triethylamine or 4-dimethylaminopyridine) used to catalyze the interfacial polymerization reaction between cyclodextrin amino derivatives and polybasic acid chlorides;

[0035] If the concentration of cyclodextrin amino derivatives is too low, the polyamide active layer formed during interfacial polymerization will not be dense enough, and the selectivity of the composite membrane will be low. If the concentration is too high, the polyamide active layer formed will be too dense, thereby reducing the moisture content of the composite membrane Flux: The time required for full soaking is related to the concentrat...

Embodiment 1

[0038] The cyclodextrin amino derivatives in the polyamide active layer of the composite membrane of Example 1 are substituents Obtained by replacing the hydroxyl group in β-cyclodextrin, the average degree of substitution is 5, and the polymer support layer is a polyacrylonitrile microfiltration membrane; the preparation process of the composite membrane includes the following steps:

[0039] (1) configure the aqueous phase solution, the aqueous phase solution containing the cyclodextrin amino derivatives with a mass fraction of 5% and the triethylamine with a mass fraction of 1%; As a solvent, trimesoyl chloride with a mass / volume fraction of 0.1% is used as a solute.

[0040] Soak the polyacrylonitrile microfiltration membrane in the aqueous phase solution for 10 minutes and then take it out.

[0041] (2) After removing the surface moisture, the upper surface is contacted with the organic phase solution for 5 minutes, and the cyclodextrin amino derivative and trimesoyl chlo...

Embodiment 2

[0043] (1) configure the aqueous phase solution, the aqueous phase solution containing the cyclodextrin amino derivatives with a mass fraction of 5% and the triethylamine with a mass fraction of 1%; As a solvent, trimesoyl chloride with a mass / volume fraction of 0.1% is used as a solute.

[0044] Soak the polyacrylonitrile microfiltration membrane in the aqueous phase solution for 10 minutes and then take it out.

[0045] (2) After removing the surface moisture, the upper surface is contacted with the organic phase solution for 10 minutes, and the cyclodextrin amino derivative and trimesoyl chloride undergo an interfacial polymerization reaction in which the amino group and the acid chloride group generate an amide on the surface of the polymer support layer to form Polyamide composite membrane.

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Abstract

The invention discloses a composite membrane for water treatment, and a preparation method thereof. The composite membrane comprises a polymer supporting layer and a polyamide active layer, wherein the polyamide active layer comprises polymerized cyclodextrin amine derivatives and polyacyl chloride; and the cyclodextrin amine derivatives comprise at least two substituent groups shown in the formula I, wherein R is a hydrogen atom or organic amine of C1 to C 6. The composite membrane is prepared by performing interfacial polymerization to cyclodextrin amine derivatives and polyacyl chloride, so that the membrane production technology is greatly simplified; the annular cavities of the cyclodextrin amine derivatives are embedded in the polyamide active layer of the composite membrane, so that the permeation resistance of water molecules can be reduced, and the permeation of the polyamide active layer is improved; and the composite membrane with high water throughout and good hydrophilicity can be obtained.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a composite membrane for water treatment and a preparation method thereof. Background technique [0002] Ultra-thin composite membrane (TFC membrane) is a kind of polymer membrane commonly used in membrane separation process, which is usually prepared by interfacial polymerization. The interfacial polymerization method to prepare ultra-thin composite membranes is to use two highly reactive monomers to polymerize at the interface of two immiscible solvents, thereby forming a very thin dense skin layer (selective layer) on the porous support layer. ). Compared with the porous support layer, the properties of the dense skin play a more critical role in the performance of the membrane. Studies have shown that the types of interfacial polymerized monomers are directly related to the properties of the dense skin of TFC membranes, and thus have a great impact on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/02B01D69/10B01D71/42B01D71/56B01D71/64B01D71/68C02F1/44
CPCB01D67/0006B01D69/02B01D69/10B01D69/125B01D71/42B01D71/56B01D71/64B01D71/68B01D2325/10C02F1/44
Inventor 王艳熊舒
Owner HUAZHONG UNIV OF SCI & TECH
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