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A kind of preparation method of metal ion imprinted composite film

A metal ion imprinting and composite membrane technology, applied in the field of membrane separation, to achieve the effects of easy operation, mild reaction conditions, significant economic benefits and environmental benefits

Active Publication Date: 2018-08-17
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
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation method of the metal ion imprinted composite membrane of the present invention uses a commercially available microporous membrane (flat polymer microporous membrane or hollow fiber polymer microporous membrane) as a base membrane and heavy metal ions as a template Ion, using ultraviolet light to initiate polymerization of functional monomers and crosslinking agents on the surface of the base membrane for ion imprinting modification to prepare a metal ion imprinted composite membrane. The technical solution includes the immobilization of the photoinitiator on the surface of the base membrane and the metal ion imprinting composite membrane. Preparation, elution of template metal ions in metal ion imprinted composite membrane, and performance inspection of metal ion imprinted composite membrane.

[0034] The microporous membrane is a polysulfone microporous filter membrane, a polyethersulfone microporous filter membrane, a polyvinylidene fluoride microporous fil...

Embodiment 1

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

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

[0065] 1.2 Preparation of Pb(Ⅱ) ion imprinted composite membrane: Using heavy metal ion Pb(Ⅱ) as template ion, take 1.0mmol of lead nitrate, 2.0mmol of acrylic acid, 50.0mmol of ethylene glycol dimethacrylate and 20ml of mass percentage concentration as The 0.2% initiator 2959 methanol solution was mixed uniformly to make a homogeneous solution system, ultrasonically degassed, ...

Embodiment 2

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

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

[0077] 1.2 Preparation of Cd(Ⅱ) ion imprinted composite membrane: Using 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 initiator 127 with a concentration of 0.5% by mass is mixed uniformly to form a homogeneous solution system, ultrasonically degassed, and then the polypr...

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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 the preparation method of preparing heavy metal ion imprinted composite membrane (selective separation composite membrane) by ultraviolet light-induced surface polymerization. Background technique [0002] Ion imprinting technology is developed on the basis of molecular imprinting technology. The ion imprinting technology imprints specific ions (target ions) as template ions in high molecular polymers, and forms specific holes after eluting the template ions. 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 precious metal ions And metal comp...

Claims

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Application Information

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