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A method for preparing ion-imprinted composite membranes by surface thermal polymerization

A technology of ion imprinting and metal ion imprinting, applied in the field of membrane separation, to achieve the effect of simple membrane treatment process, simple preparation process and easy operation

Active Publication Date: 2019-02-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The imprinted pores of ion-imprinted polymers using metal ions as template ions can efficiently identify metal ions. Therefore, the use of ion imprinting technology to modify polymer membranes can introduce recognition sites on the surface of the membrane, while retaining the separation advantages of polymer membranes. On the basis of endowing it with the ability to selectively separate target metal ions, the prepared ion-imprinted membrane is used for the removal of heavy metal ions in water, which is a promising membrane technology method, and the ion-imprinted composite membrane for removing heavy metals is prepared by surface thermal polymerization Rarely reported before

Method used

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  • A method for preparing ion-imprinted composite membranes by surface thermal polymerization

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Experimental program
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Effect test

Embodiment 1

[0035] (1) With the polyvinylidene fluoride microporous flat filter membrane as the base membrane, the polyvinylidene fluoride microporous flat filter membrane is immersed in the acetonitrile solution of the initiator azobisisobutyronitrile with a concentration of 0.03g / ml for 1 hour Then take it out and let it dry naturally to obtain a polymer microporous membrane whose membrane surface is covered with an initiator.

[0036](2) With the heavy metal ion Pb(II) as the template ion, take 1.0mmol of lead nitrate and 2.0mmol of acrylic acid and mix thoroughly, then add 50.0mmol of ethylene glycol dimethacrylate and 0.06mmol of azobisisobutyronitrile, and Mix 20ml of acetonitrile evenly to make a homogeneous solution system, ultrasonically degas, then immerse the polyvinylidene fluoride microporous flat filter membrane covered with an initiator in the solution system, pass through nitrogen gas for 8 minutes, and heat to The reaction was incubated at 55° C. for 24 hours to obtain a ...

Embodiment 2

[0040] (1) take the polypropylene microporous hollow fiber filter membrane as the base membrane, and the polypropylene microporous hollow fiber filter membrane is immersed in the ethanol solution of the initiator azobisisobutyrate of 0.01g / ml in concentration, 4 After one hour, take it out and let it dry naturally to obtain a polymer microporous membrane whose membrane surface is covered with an initiator.

[0041] (2) Take the heavy metal ion Cd(II) as the template ion, take 1.0mmol of cadmium chloride, 4.0mmol of methacrylic acid and mix thoroughly, then add 20.0mmol of trimethoxypropane trimethacrylate and 0.04mmol of azobisiso Dimethyl butyrate was mixed evenly with 18ml ethanol to make a homogeneous solution system, ultrasonically degassed, and then the polypropylene microporous hollow fiber filter membrane covered with an initiator was immersed in the solution system, and nitrogen gas was passed into it for 10min. Heating to 50° C. and insulated reaction for 36 hours und...

Embodiment 3

[0045] (1) Taking the polyacrylonitrile microporous hollow fiber filter membrane as the base membrane, the polyacrylonitrile microporous hollow fiber filter membrane is immersed in the methanol solution of the initiator azobisisoheptanonitrile with a concentration of 0.005g / ml for 2 hours Then take it out and let it dry naturally to obtain a polymer microporous membrane whose membrane surface is covered with an initiator.

[0046] (2) With the heavy metal ion Ni(II) as the template ion, take 1.0mmol of nickel sulfate, 8.0mmol of methyl methacrylate, 20.0mmol of trimethoxypropane trimethacrylate and 10mmol of ethylene glycol dimethacrylate The ester is fully mixed, then add 0.008mmol of azobisisoheptanonitrile, and mix it with 16ml of methanol to make a homogeneous solution system, ultrasonic degassing, and then immerse the polyacrylonitrile microporous hollow fiber filter membrane covered with the initiator The solution system was fed with nitrogen gas for 5 minutes, and heate...

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Abstract

The invention relates to a method for preparing an ionic imprinting composite membrane through surface thermopolymerization. The method is characterized in that a polymer microfiltration membrane is used as a support membrane, a functional monomer and a cross-linking agent undergo a modification polymerization reaction on the surface of the base membrane under heating action, and through an ionic imprinting technology, an ionic imprinting composite film with a selective separation effect on template ions is obtained. The method comprises 1, base membrane surface coating with an initiator, 2, metal ionic imprinting composite film preparation, 3, template ion elution and 4, composite membrane performance investigation. The method does not need complex and special equipment, is simple, can be easily operated, has mild conditions and has a low production cost. The ionic imprinting composite membrane can remove metal ions in water. The method has the characteristics of simple processes, high efficiency, low cost and strong selectivity and has a wide application prospect in the field of heavy metal ion-containing waste water treatment.

Description

technical field [0001] The invention relates to a method for preparing an ion-imprinted composite membrane, more specifically to a method for preparing a composite membrane for selective separation of heavy metal ions by surface thermal polymerization, and the invention belongs to the technical field of membrane separation. Background technique [0002] The existence of heavy metals in water may cause serious harm to people's health. Heavy metals in water mainly refer to lead, mercury, cadmium, chromium, arsenic, etc. with significant biological toxicity, and also include toxic heavy metals zinc, copper, cobalt, nickel, tin, Pollutants such as vanadium. [0003] Lead is a heavy metal that is seriously harmful to the human body, and it will cause obvious damage to the nervous system, kidneys, and hematopoietic system. Lead ions are not biodegradable, and are easy to accumulate and expand in the environment or in the biological chain. Long-term drinking of water with excessiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/14C08F220/14C08F220/56C08F226/06C08F212/36C08J9/26
Inventor 杨丽平春霞王玉杰
Owner CHINA PETROLEUM & CHEM CORP
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