Preparation method of polyethyleneimine-modified graphene aerogel

A technology of graphene airgel and polyethyleneimine, which is applied in the direction of airgel preparation, graphene, chemical instruments and methods, etc., can solve the problem of affecting the service life of extraction fibers, difficult modification of metal surface, and mechanical properties of quartz To achieve the effect of enhancing mechanical strength and extraction performance, shortening sample analysis time, and improving mechanical strength

Inactive Publication Date: 2019-02-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Quartz is a common carrier for preparing solid-phase microextraction fibers. Quartz has poor mechanical properties and is prone to breakage during operation, which seriously affects the service life of the extraction fibers.
In order to improve the mechanical strength of solid-phase microextraction fibers, people began to study metal wires as car...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The polyethyleneimine aqueous solution was added dropwise to the graphene oxide aqueous dispersion, and the polyethyleneimine-graphene oxide dispersion was obtained after stirring evenly. The concentration of polyethyleneimine in the dispersion was 0.1 mg / mL, and the oxidation The concentration of graphene in the dispersion is 1 mg / mL, add ascorbic acid to make the concentration 5 mg / mL, put the mixed solution in an autoclave, react at a constant temperature of 100 °C for 12 h, and freeze-dry the obtained solid Polyethyleneimine modified graphene airgel was prepared. It was ground and pulverized, and glued to the surface of stainless steel wire to prepare polyethylenimine modified graphene airgel-coated stainless steel wire solid-phase microextraction fiber, which was used in conjunction with gas chromatography to apply to polycyclic compounds in environmental water samples. Analysis and detection of aromatic hydrocarbon pollutants.

Embodiment 2

[0018] The polyethyleneimine aqueous solution was added dropwise to the graphene oxide aqueous dispersion, and after stirring evenly, a polyethyleneimine-graphene oxide dispersion was obtained. The concentration of polyethyleneimine in the dispersion was 0.5 mg / mL, and the oxidation The concentration of graphene in the dispersion is 5 mg / mL, add ascorbic acid to make the concentration 18 mg / mL, put the mixed solution in a high-pressure reactor, react at a constant temperature of 150 °C for 6 h, and freeze-dry the obtained solid Polyethyleneimine modified graphene airgel was prepared. It was ground and pulverized, and glued to the surface of titanium wire to prepare polyethylenimine modified graphene airgel-coated titanium wire solid-phase microextraction fiber, which was used in conjunction with gas chromatography to apply to polycyclic compounds in environmental water samples. Analysis and detection of aromatic hydrocarbon pollutants.

Embodiment 3

[0020] The polyethyleneimine aqueous solution was added dropwise to the graphene oxide aqueous dispersion, and after stirring evenly, a polyethyleneimine-graphene oxide dispersion was obtained. The concentration of polyethyleneimine in the dispersion was 0.3 mg / mL. The concentration of graphene in the dispersion is 3 mg / mL, add ascorbic acid to make the concentration 10 mg / mL, put the mixed solution in a high-pressure reactor, react at a constant temperature of 120 °C for 9 h, and freeze-dry the obtained solid Polyethyleneimine modified graphene airgel was prepared. It was ground and pulverized, and glued to the surface of nickel wire to prepare polyethylenimine modified graphene airgel-coated nickel wire solid-phase microextraction fiber, which was used in conjunction with gas chromatography to apply to polycyclic rings in environmental water samples. Analysis and detection of aromatic hydrocarbon pollutants.

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Abstract

The invention discloses a preparation method of polyethyleneimine-modified graphene aerogel and in particular relates to a coating material prepared from the polyethyleneimine-modified graphene aerogel. The novel method is characterized by comprising the steps: selecting polyethyleneimine to modify graphene oxide, and then, reducing graphene oxide by using ascorbic acid to generate the polyethyleneimine-modified graphene aerogel in situ. The prepared aerogel is ground and smashed and is stuck to the surface of a metal wire by using glue to prepare a solid-phase microextraction fiber of a polyethyleneimine-modified graphene aerogel coating. The solid-phase microextraction fiber prepared by using the preparation method has the advantages such as high mechanical strength, good coating stability and excellent extraction property and can be applied to enrichment analysis of a trace amount of polyaromatic hydrocarbon pollutants in an environmental water sample if being combined with a gas chromatography so as to have a good application potential.

Description

technical field [0001] The invention relates to a technology for preparing polyethyleneimine modified graphene airgel. Background technique [0002] Solid phase microextraction (SPME) is a new sample pretreatment technology developed in the 1990s that integrates sampling, enrichment, purification, and analysis. It has the advantages of simplicity, speed, sensitivity, automation, and instrumentation. It has been widely used in the fields of environment, food, medicine and biological analysis. Usually referred to as SPME refers to fiber solid phase microextraction, the core is to extract the fiber. The stability and extraction performance of extraction fibers depend on the carrier and extraction coating. Quartz is a common carrier for preparing solid-phase microextraction fibers. Quartz has poor mechanical properties and is prone to breakage during operation, which seriously affects the service life of the extraction fibers. In order to improve the mechanical strength of so...

Claims

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Application Information

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IPC IPC(8): C01B32/184B01J13/00
CPCB01J13/0091C01B32/184
Inventor 冯加庆冯娟娟孙敏
Owner UNIV OF JINAN
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