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Preparation method and use of graphene oxide surface molecularly imprinted sol-gel polymer

A gel polymer, graphene surface technology, applied in the direction of material electrochemical variables, can solve problems such as difficult identification, and achieve the effects of low cost, simple preparation method and large specific surface area

Inactive Publication Date: 2014-11-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There are many ways to prepare molecularly imprinted polymers, such as bulk polymerization, multi-step swelling polymerization, suspension polymerization, precipitation polymerization, etc. Currently, most molecularly imprinted polymers can only be polymerized and applied in the organic phase, while natural molecular recognition systems are mostly in How to carry out molecular imprinting and recognition in aqueous solution or polar solvent is a big problem

Method used

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  • Preparation method and use of graphene oxide surface molecularly imprinted sol-gel polymer

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Embodiment 1

[0022] Weigh 10 mg of graphene oxide into a 100 mL beaker, add 50 mL of deionized water, ultrasonicate for 30 minutes, add 10 mg of phenyltrimethoxysilane and 10 mg of tetramethoxysilane in turn with ultrasonic, add concentrated ammonia water dropwise while stirring, and adjust the pH to 8. Stir for 1h. Add 5 mL of 0.5 mg / mL paracetamol aqueous solution to the mixed solution, and stir for 14 h. After centrifugal washing, the graphene oxide surface molecularly imprinted sol-gel polymer was obtained. Add 5 μL of polymer aqueous solution dropwise on a clean glassy carbon electrode and let it dry naturally. The imprinted molecule was eluted with absolute ethanol for 24 hours to obtain an electrode modified by the imprinted polymer membrane. The eluted modified electrode was incubated in different concentrations of paracetamol aqueous solution for 10 min, and then the modified electrode was correctly connected with the reference electrode and the counter electrode on the electroc...

Embodiment 2

[0024] Weigh 30mg of graphene oxide in a 100mL beaker, add 50mL of deionized water, ultrasonic for 40min, add 20mg of phenyltriethoxysilane and 80mg of tetramethoxysilane in sequence with ultrasonic, add acetic acid dropwise while stirring, adjust the pH to 5. Stir for 2h. Add 5 mL of 1 mg / mL dopamine aqueous solution to the mixed solution, and stir for 2 h. After centrifugal washing, the graphene oxide surface molecularly imprinted sol-gel polymer was obtained. Add 10 μL of polymer aqueous solution dropwise on a clean glassy carbon electrode and let it dry naturally. The imprinted molecules were eluted with a mixed solution of methanol-acetic acid (v / v=8:1) for 10 hours to obtain an electrode modified with an imprinted polymer membrane. The eluted modified electrode was incubated in different concentrations of dopamine aqueous solution for 15 minutes, and then the modified electrode was correctly connected with the reference electrode and the counter electrode on the electr...

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Abstract

The invention provides a preparation method and use of a graphene oxide surface molecularly imprinted sol-gel polymer and relates to the technical field of combination of polymer material science and chemical sensors. Graphene oxide as a carrier and siloxane as a functional monomer and a cross-linking agent are subjected to sol-gel method treatment in an aqueous solution at a normal temperature so that the graphene oxide surface molecularly imprinted sol-gel polymer is obtained, and the graphene oxide surface molecularly imprinted sol-gel polymer can be used in the field of electrochemical sensors and can realize fast analysis detection of a template molecule. The preparation method has the simple process of mixing the carrier, the template molecule, the functional monomer, the cross-linking agent and the solvent according to a certain ratio, has a low cost, saves energy and is environmentally friendly. The graphene oxide surface molecularly imprinted sol-gel polymer-based electrochemical sensor has the advantages of rapid response to the imprinted molecule, good selectivity, high sensitivity and good stability.

Description

Technical field: [0001] The invention relates to the technical field of combining polymer material science and chemical sensors, in particular to the preparation and application of a molecularly imprinted sol-gel polymer on the surface of graphene oxide. Background technique: [0002] Molecular imprinting technology is to "imprint" template molecules (or ions) on a certain substrate, so that the substrate has specific selectivity and binding ability for template molecules, so that it can be used for the separation, enrichment and detection of template molecules. However, molecularly imprinted polymers prepared by traditional methods usually have some problems, such as: irregular shape; too deep embedding of imprinted sites, affected by steric hindrance, poor accessibility of internal imprinted cavities, resulting in molecularly imprinted polymers and templates The combination of molecules is difficult, the binding rate is slow, and the internal template molecules are not eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 罗静丛姣姣刘晓亚
Owner JIANGNAN UNIV
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