Preparation method and application SiO2/GO surface metal ion imprinted polymer

An ion imprinting, surface metal technology, applied in the directions of alkali metal compounds, alkali metal oxides/hydroxides, chemical instruments and methods, etc. It has problems such as real-time sensitivity, and achieves excellent specific recognition performance, good mechanical properties and thermal stability, and avoids incomplete elution.

Inactive Publication Date: 2015-04-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First, the recognition sites of molecularly imprinted polymers prepared by traditional methods are mostly embedded in polymer particles with high cross-linking density, which makes it difficult to completely remove the template from the polymer body, thus reducing the imprinting efficiency; in addition, A large number of recognition sites are located inside the cross-linked polymer, the diffusion resistance inside the medium is large, and the target molecule is difficult to access, thus becoming an invalid recognition site, which greatly reduces the transmission rate and recognition ability of the target molecule on the surface of the material, and does not have real-time sensitivity. sex
Second, the traditional MIP preparation method has problems such as many side reaction products and difficult control of the reaction process. How to obtain a molecularly imprinted polymer layer with ultra-thin and uniform distribution of adsorption sites is the key to MIT.

Method used

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  • Preparation method and application SiO2/GO surface metal ion imprinted polymer

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Experimental program
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Effect test

Embodiment 1

[0048] (1) Take 5 mL of 2 g / L graphene oxide aqueous solution and Erlenmeyer flask, then add 40 mL of absolute ethanol; and weigh 0.2 g of polyvinylpyrrolidone into the above mixed solution, and stir magnetically at room temperature for 30 min. Then, 2 mL of concentrated ammonia water and 0.5 mL of tetraethylorthosilicate were added to the above mixed solution, and the mixture was ultrasonically reacted for 30 min. Finally, it was placed in a water bath at 30 °C for 12 h. After the reaction, wash with deionized water to neutrality, and dry in vacuum at 50°C to obtain the silica / graphene oxide composite material (SiO 2 / GO).

[0049] (2) 50 mg SiO obtained in step (1) 2 / GO was added to 25 mL of ethanol solution, and dispersed evenly by ultrasonication. Then, 2.5 mL of MPS was added to the above mixed solution, placed in a water bath at 30 °C, and stirred magnetically for 8 h. After the reaction, the product was washed with ethanol and deionized water for 5 times to elute un...

Embodiment 2

[0056] (1) Take 5 mL of 2 g / L graphene oxide aqueous solution and Erlenmeyer flask, then add 40 mL of absolute ethanol; and weigh 0.5 g of polyvinylpyrrolidone into the above mixed solution, and magnetically stir at room temperature for 60 min. Then, 2 mL concentrated ammonia water and 0.5 mL tetraethyl orthosilicate were added to the above mixed solution, and the reaction was ultrasonicated for 60 min. Finally, react in a water bath at 40 °C for 24 h. After the reaction, wash with deionized water to neutrality, and dry in vacuum at 50°C to obtain the silica / graphene oxide composite material (SiO 2 / GO).

[0057] (2) 100 mg SiO obtained in step (1) 2 / GO was added to 50 mL of ethanol solution and dispersed evenly by ultrasonication. Then, 5 mL of MPS was added to the above mixed solution, and placed in a 40 °C water bath, and magnetically stirred for 12 h. After the reaction, the product was washed with ethanol and deionized water for 5 times to elute unreacted MPS. , drie...

Embodiment 3

[0063] (1) Take 5 mL of 2 g / L graphene oxide aqueous solution and Erlenmeyer flask, then add 40 mL of absolute ethanol; and weigh 1 g of polyvinylpyrrolidone into the above mixed solution, and magnetically stir at room temperature for 90 min. Then, 2 mL of concentrated ammonia water and 0.5 mL of tetraethylorthosilicate were added to the above mixed solution, and the mixture was ultrasonically reacted for 90 min. Finally, react in a 50 °C water bath for 36 h. After the reaction, wash with deionized water to neutrality, and dry in vacuum at 50°C to obtain the silica / graphene oxide composite material (SiO 2 / GO).

[0064] (2) 200 mg SiO obtained in step (1) 2 / GO was added to 100 mL of ethanol solution, and dispersed evenly by ultrasonication. Then, 10 mL of MPS was added to the above mixed solution, placed in a 50 °C water bath, and magnetically stirred for 24 h. After the reaction, the product was washed with ethanol and deionized water for 5 times to elute unreacted MPS. ...

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Abstract

The invention provides a preparation method and application a SiO2/GO surface metal ion imprinted polymer and belongs to the technical field of material preparation and separation. Particularly, silica/graphene oxide is used as a base, metal ions serve as a template, coupling agents, functional nonomers, cross-linking agents and initiators are used, reversible addition-fragmentation chain transfer polymerization serves as a polymerization mode, and the SiO2/GO surface metal ion imprinted polymer is prepared; the problems that the thickness of the surface polymer cannot be controlled, adsorption sites are not uniformly distributed, template molecules cannot be thoroughly eluted because they are wrapped too deep, the adsorption speed is low, the synthesis steps of chain transfer agents are complex, and time is consumed are solved; the SiO2/GO surface metal ion imprinted polymer is mainly used for selectively separating corresponding metal ions in a water solution, the selective separation effect is remarkable, and the polymer can be reused many times.

Description

technical field [0001] The invention belongs to the technical field of material preparation and separation, and specifically relates to the synthesis of SiO by reversible addition-fragmentation chain transfer polymerization technology. 2 Preparation method of metal ion imprinted polymer on / GO surface and application of the imprinted polymer. Background technique [0002] With the rapid development of human society, especially the rapid development of industrial production, a large number of pollutants have entered the water body in different forms, exceeding the self-purification capacity of the water body, causing the function of the water body ecosystem to be destroyed, causing the ecological environment of the water body to deteriorate. deterioration. Heavy metals are one of the main pollutants that cause water pollution. They invade the biosphere through various channels and accumulate in the organism. They are not easy to be excreted in the metabolic process, serious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/06C08F220/14C08F226/06C08F2/38C08J9/26B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 刘燕孟祥国罗敏倪良孟敏佳仇健
Owner JIANGSU UNIV
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