Porphyrin covalent organic framework/graphene aerogel composite material as well as electrochemical sensor and application thereof

A graphene aerogel, covalent organic framework technology, applied in the direction of material electrochemical variables, scientific instruments, analytical materials, etc., can solve the problems of limiting the application of COF, low catalytic activity, etc., to achieve easy industrialization, high specific surface area , the effect of easy post-processing

Active Publication Date: 2020-12-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the reported COFs exist in the form of microcrystalline powders with mesoporous or microporous pores, which greatly limits the application of COFs in diffusion processes and leads to low catalytic activity.

Method used

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  • Porphyrin covalent organic framework/graphene aerogel composite material as well as electrochemical sensor and application thereof
  • Porphyrin covalent organic framework/graphene aerogel composite material as well as electrochemical sensor and application thereof
  • Porphyrin covalent organic framework/graphene aerogel composite material as well as electrochemical sensor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Preparation method of porphyrin covalent organic framework / graphene airgel composite (COF-366-Fe / GA)

[0041] 1.1

[0042] (1) Graphene oxide was prepared into a 5 mg / mL aqueous solution in a beaker, freeze-dried for 24 hours and then taken out to obtain graphene oxide airgel;

[0043] (2) The graphene oxide airgel was reduced with 80% hydrazine hydrate solution at 90 °C for 24 hours, and then vacuum-dried for 24 hours to obtain reduced graphene oxide airgel (GA);

[0044] (3) Add GA (10 mg), 5,10,15,20-tetrakis(4-aminophenyl) porphyrin iron Fe(TAPP) (14.6 mg), terephthalaldehyde (5.6 mg), mesitylene (0.5 mL), ethanol (0.5 mL) and acetic acid aqueous solution (6 M, 0.1 mL) were added to a heat-resistant glass tube, ultrasonicated for 30 minutes, then degassed three times, sealed, and the reaction was heated at 120 °C 72 hours;

[0045] (4) After the reaction is completed, a deep purple precipitate is produced at the bottom of the tube, and the product is ob...

Embodiment 2

[0059] Example 2 Preparation of Nitric Oxide Electrochemical Sensor

[0060] 2.1

[0061] 2 mg porphyrin covalent organic framework / graphene airgel composite COF-366-Fe / GA was uniformly dispersed in 375 μL ethanol and 125 μL deionized water solvent containing 2 μL naphthol (5 wt%). Subsequently, 5 μL of the prepared mixture was coated on the pretreated glassy carbon electrode and dried overnight at room temperature to obtain an electrochemical sensor for nitric oxide

[0062] 2.2

[0063] Take 4 mg porphyrin covalent organic framework / graphene airgel composite (COF-366-Fe / GA) and uniformly disperse it in 750 μL ethanol and 250 μL deionized water solvent containing 4 μL naphthol (5wt%) middle. Subsequently, 7 μL of the prepared mixture was coated on the pretreated glassy carbon electrode and dried overnight at room temperature to obtain an electrochemical sensor for nitric oxide.

Embodiment 3

[0064] Example 3 Performance Measurement of Nitric Oxide Electrochemical Sensor

[0065] A three-electrode system is adopted, the glassy carbon electrode coated with the COF-366-Fe / GA composite material prepared in Example 2 is used as the working electrode, the platinum wire is used as the counter electrode, the saturated calomel electrode is used as the reference electrode, and the electrolyte The solution is 0.01 M PBS solution (pH7.4), and at the same time, it is necessary to prepare a PBS solution (1.8 mM) containing saturated nitric oxide, and use an electrochemical workstation to test its performance through various methods;

[0066] Using cyclic voltammetry, set the scan rate to 0.1 V / s, and the scan range to 0-1.2 V, and test the CV curves of the COF-366-Fe / GA modified glassy carbon electrode in different concentrations of nitric oxide solutions. see results Figure 8 , the results showed that in the concentration range of 0-432 μM, as the concentration increased, th...

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Abstract

The invention belongs to the technical field of preparation and application of functional composite materials, and provides a porphyrin covalent organic framework/graphene aerogel composite material and a preparation method and application of an electrochemical sensor based on the composite material. As the porphyrin covalent organic framework/graphene aerogel composite material has a 3D porous structure, the porphyrin covalent organic framework/graphene aerogel composite material shows high specific surface area, high conductivity and electrochemical activity of catalytic oxidation, and is coated on a glassy carbon electrode to form a working electrode for constructing a nitric oxide electrochemical sensor. The sensor can be used for real-time detection of nitric oxide released by cells.The sensor shows extremely low detection limit and high selectivity in actual detection, and is stable in electrochemical performance, relatively long in recycling service life and convenient for commercial application.

Description

technical field [0001] The invention relates to the technical field of preparation and application of functional composite materials, in particular to a porphyrin covalent organic framework / graphene airgel composite material, an electrochemical sensor, and applications for detecting nitric oxide. Background technique [0002] As an important free radical messenger, endogenous nitric oxide plays an important role in many pathological and physiological processes, including nerve signal transduction, vasodilation, neurotransmission, blood pressure regulation and immune response, etc. Normal concentration of nitric oxide participates in the regulation of cell metabolism, proliferation, differentiation, apoptosis and other life activities, but when the concentration is too high, it will cause cell pathology, cause abnormal cell death, and lead to body diseases, among which it is related to the central nervous system, Cardiovascular system, genitourinary system, gastrointestinal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L87/00C08K7/24C08G83/00G01N27/30
CPCC08K7/24C08G83/008G01N27/308C08L87/00
Inventor 张丽影朱沛华胡晓培朱荣杰郭瑞华
Owner UNIV OF JINAN
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