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Preparation method for metal ion-imprinted composite film

A technology of metal ion imprinting and heavy metal ions, applied in the field of membrane separation, to achieve mild reaction conditions, long service life, significant economic and environmental benefits

Active Publication Date: 2016-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer porous membranes have the advantages of high porosity, large specific surface area, and good permeability. Therefore, the use of metal ion imprinting technology to modify polymer porous membranes can introduce recognition sites on the surface of polymer porous membranes. Based on the advantages of porous membranes, it is endowed with the ability of highly selective separation of metal ions. In practical applications, it can selectively separate and remove heavy metal ions that are difficult to treat in wastewater. This has rarely been reported in previous literature. Broad application prospects in the field of sewage treatment

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0033] The preparation method of the metal ion imprinted composite membrane of the present invention uses commercially available commercial microporous membranes (flat polymer microporous membranes or hollow fiber polymer microporous membranes) as base membranes, and heavy metal ions as templates Ions, using ultraviolet light to trigger functional monomers and cross-linking agents to polymerize on the surface of the basement membrane for ion imprinting modification, to prepare a metal ion imprinted composite membrane. Preparation, elution of template metal ions in metal ion imprinted composite membranes, performance investigation of metal ion imprinted composite membranes, etc.

[0034] The microporous membrane is a polysulfone microporous membrane, a polyethersulfone microporous membrane, a polyvinylidene fluoride microporous membrane, a polypropylene microporous membrane or a polyacrylonitrile microporous membrane.

[0035] The preparation method of the metal ion imprinted c...

Embodiment 1

[0063] (1) Preparation of metal ion imprinted membrane

[0064] 1.1 Fixation of the photoinitiator: with the polyvinylidene fluoride microporous flat filter membrane as the base film, immerse the polyvinylidene fluoride microporous flat filter membrane in the methanol solution of photoinitiator 2959 with a mass percent concentration of 1.0%, for 1 hour Then take it out and let it dry naturally. 2 In the atmosphere, 0.5min is irradiated by ultraviolet rays (wavelength is 365nm) to obtain a polymer microporous membrane whose surface is covered with a photoinitiator;

[0065] 1.2 Preparation of Pb(II) ion-imprinted composite membrane: Take heavy metal ion Pb(II) as template ion, take 1.0mmol lead nitrate, 2.0mmol acrylic acid, 50.0mmol ethylene glycol dimethacrylate and 20ml mass percent concentration of 0.2% methanol solution of initiator 2959 was mixed evenly to make a homogeneous solution system, degassed by ultrasonic, and then the polyvinylidene fluoride microporous flat fi...

Embodiment 2

[0075] (1) Preparation of metal ion imprinted membrane

[0076] 1.1 Fixation of the photoinitiator: take the polypropylene microporous hollow fiber filter membrane as the base membrane, immerse the polypropylene microporous hollow fiber filter membrane in the ethanol solution of photoinitiator 127 with a mass percentage concentration of 3.0%, and take it out after 6 hours Naturally dried, the dried film was in N 2 In the atmosphere, irradiate with ultraviolet light (wavelength is 365nm) for 3 minutes to obtain a polymer microporous membrane whose surface is covered with a photoinitiator;

[0077] 1.2 Preparation of Cd(II) ion-imprinted composite membrane: Take heavy metal ion Cd(II) as template ion, take 1.0mmol cadmium chloride, 1.0mmol methacrylic acid, 20.0mmol trimethoxypropane trimethacrylate and 30ml The ethanol solution of the initiator 127 with a mass percentage concentration of 0.5% is mixed evenly to form a homogeneous solution system, and ultrasonically degassed, a...

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Abstract

The invention relates to a preparation method for a metal ion-imprinted composite film. According to the preparation method, a commercially-available microporous filtration film is used as a base film, heavy metal ions are used as template ions, and ultraviolet light is utilized to initiate polymerization of functional monomers and a cross-linking agent on the surface of the base film so as to realize ion imprinting modification; and thus, the metal ion-imprinted composite film is prepared. According to the preparation method for the metal ion-imprinted composite film, ultraviolet light is utilized to initiate surface polymerization so as to realize modification of the polymer porous film, and recognition sites are introduced into the surface of the polymer porous film so as to realize ion imprinting of the polymer porous film; and the preparation method is simple and easy to operate, and reaction conditions are mild.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a metal ion imprinted composite membrane. In particular, it refers to a preparation method for preparing heavy metal ion imprinted composite membranes (selective separation composite membranes) by initiating surface polymerization with ultraviolet light. Background technique [0002] Ion imprinting technology is developed on the basis of molecular imprinting technology. Ion imprinting technology uses specific ions (target ions) as template ions to be imprinted in polymers, and specific holes are formed after the template ions are eluted. Ion imprinting technology not only retains the advantages of molecular imprinting technology, but also has the function of identifying template ions (also known as imprinted ions), so it is widely used in the separation and recovery of transition metal ions, toxic metal ions, rare metals and noble metal ions An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/34B01D71/26B01D69/12B01D67/00C02F1/44
Inventor 杨丽魏昕杨永强
Owner CHINA PETROLEUM & CHEM CORP
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