CN117659325B - Preparation method of covalent organic framework material with electrochemical activity - Google Patents

Preparation method of covalent organic framework material with electrochemical activity Download PDF

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CN117659325B
CN117659325B CN202410133323.1A CN202410133323A CN117659325B CN 117659325 B CN117659325 B CN 117659325B CN 202410133323 A CN202410133323 A CN 202410133323A CN 117659325 B CN117659325 B CN 117659325B
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covalent organic
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CN117659325A (en
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辛建会
阎孟霞
王竹青
罗鑫
于雪
李娥娥
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Dezhou University
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Abstract

The invention relates to the technical field of covalent organic frameworks, and particularly discloses a preparation method of a covalent organic framework material with electrochemical activity, which comprises the following steps: preparation of electrochemically active COF nanoparticles, synthesis of COF/Au, and synthesis of COF/Au/CNT-COOH. The ternary amino ligand and 1,1' -ferrocene dicarboxaldehyde are condensed through Schiff base reaction, ethanol, acetonitrile and dichloromethane are used as solvents, acetic acid is used as a catalyst, a high-yield high-purity product is obtained, and then the synthesized novel covalent organic framework is modified by gold nano particles and carboxyl functionalized multiwall carbon nano tubes, so that the novel covalent organic framework can be used for high-sensitivity detection of miRNA in tumor cells.

Description

Preparation method of covalent organic framework material with electrochemical activity
Technical Field
The invention relates to the technical field of covalent organic frameworks, in particular to a preparation method of a covalent organic framework material with electrochemical activity.
Background
Covalent organic framework COFs are crystalline porous polymers formed by the linkage of organic monomers through strong covalent bonds. COFs have been used in the fields of gas storage, proton conduction, photocatalysis, drug delivery, etc. due to their advantages of good thermal and chemical stability, ultra-high surface area, good biocompatibility, unique uniform pore structure, etc. By using electrochemically active monomers, some electrochemically active COFs can be prepared and used as reference or response signals to construct highly sensitive biosensors. COFs are rarely used in the field of electrochemical biosensing due to their poor conductivity.
In order to solve the above problems, a technical solution is now provided.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, the present invention provides a method for preparing an electrochemically active covalent organic framework material, comprising: preparing COF nano particles with electrochemical activity; synthesis of COF/Au (COF/gold nanoparticles); synthesis of COF/Au/CNT-COOH (COF/gold nanoparticles/carboxylated carbon nanotubes). Condensing a ternary amino ligand and 1,1' -ferrocene dicarboxaldehyde through Schiff base reaction, stirring at room temperature for 12-36 hours by taking ethanol, acetonitrile and dichloromethane as solvents and acetic acid as catalysts to obtain a crude product, centrifugally separating, purifying and vacuum drying the crude product to obtain a high-yield high-purity product, and then modifying a synthesized novel covalent organic framework by gold nano particles and carboxyl functionalized multi-wall carbon nano tubes to improve the conductivity of the material, thereby being used for high-sensitivity detection of miRNA in tumor cells.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for preparing a covalent organic framework material with electrochemical activity, which is characterized by comprising the following specific steps:
step one, preparing electrochemically active COF nano particles;
step two, synthesizing COF/Au (COF/gold nanoparticles);
step three, synthesis of COF/Au/CNT-COOH (COF/gold nanoparticles/carboxylated carbon nanotubes).
Further, in the first step, the reaction solvent is 8mL of ethanol, acetonitrile or dichloromethane, the reaction monomers are a ternary amino ligand and 1,1 '-ferrocene dicarboxaldehyde, the catalyst is 0.2mL of acetic acid, the ternary amino ligand comprises 1,3, 5-tri (4-aminophenyl) benzene, 4- (4-aminophenyl) -2, 6-di (4-aminophenyl) pyridine, tri (4-aminophenyl) amine, 5' '- (4' -amino 1,1 '-biphenyl 1-4-yl), 4' '',4'' '' '' - (1, 3, 5-triazine-2, 4, 6-triyl) tris ([ [1,1 '-biphenyl ] -4-amine ]), and the mass ratio of N4, N4-bis (4' -amino- [1,1 '-biphenyl ] -4-yl) - [1,1' -biphenyl ] -4,4 '-diamine to 1,1' -ferrocene dicarboxaldehyde is respectively 1:1,2:1,1:2,3:2,2:3, wherein the specific steps for preparing the electrochemically active COF nano particles are as follows:
step A1, mixing ethanol, acetonitrile or dichloromethane, a tertiary amino ligand, 1' -ferrocene dicarboxaldehyde and acetic acid;
step A2, stirring at room temperature for reaction for 12-36 hours to obtain a crude product;
step A3, centrifugally separating the crude product, washing the crude product in ethanol, acetonitrile and dichloromethane three times for purification, and drying the crude product in vacuum at 50-70 ℃ for 6-12 hours to obtain products FC-COF-1 to FC-COF-6.
Further, in the second step, the reaction compound synthesized by COF/Au (COF/gold nanoparticle) contains: 1mg of the dried COF nanoparticles prepared in the first step, 5mL of ultrapure water or ethanol, chloroauric acid solution with a concentration of 1.5mg/mL and sodium borohydride solution with a concentration of 1.5mg/mL, and the reaction steps are as follows:
step B1, 1mg of the dried COF nano particles are dispersed in 5mL of ultrapure water or ethanol in an ultrasonic manner to form a reaction system solution;
step B2, sequentially adding chloroauric acid solution with the volume of 0.1mL, 0.2mL, 0.4mL and 0.8mL and the concentration of 1.5mg/mL into the reaction system solution, and stirring at room temperature or carrying out ultrasonic stirring reaction for 2-6 hours to form a mixed reaction system;
step B3, adding a proper amount of sodium borohydride solution with the concentration of 1.5mg/mL into the reaction system rapidly, and continuing stirring at room temperature or ultrasonic stirring for 2 hours to obtain a COF/Au (COF/gold nanoparticles) crude product;
and step B4, centrifugally washing the product, and drying.
Further, in the third step, the reaction compound synthesized by COF/Au/CNT-COOH (COF/gold nanoparticle/carboxylated carbon nanotube) contains: 1mg of the COF/Au nano-particles and carboxylated carbon nano-tubes prepared in the second step, wherein the reaction steps are as follows:
step C1, dispersing 1mg of the dried COF/Au nanoparticles and CNT-COOH of different masses (0.01 mg, 0.05mg, 0.1mg, 0.5mg, 1mg, 5 mg) in a beaker containing 5mL of ultrapure water, respectively;
step C2, mixing the two solutions in different beakers, performing ultrasonic treatment for 1 hour, and stirring at room temperature for 3 hours;
step C3, centrifuging, washing with water and drying, collecting target COF/Au/CNT-COOH (COF/gold nanoparticles/carboxylated carbon nanotubes) products, which appear as black powder.
The preparation method of the covalent organic framework material with electrochemical activity has the technical effects and advantages that:
according to the invention, the high-conductivity material (such as noble metal, graphene and carbon nano tube) and the COFs are compounded to prepare the functionalized COFs nano composite material, so that the conductivity of the composite material can be effectively improved to realize excellent electrochemical performance.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing an electrochemically active covalent organic framework material according to the present invention;
FIG. 2 is a schematic representation of the synthesis of an electrochemically active ferrocenyl covalent organic framework of the present invention;
FIG. 3 is a graph showing DPV of COF/GCE of the present invention in 0.1M PBS buffer at pH 7.4;
FIG. 4 is a sheet morphology of an electrochemically active ferrocenyl covalent organic framework of the present invention;
FIG. 5 is a bar-shaped morphology of an electrochemically active ferrocenyl covalent organic framework of the present invention;
FIG. 6 is a diagram of a spherical morphology of an electrochemically active ferrocenyl covalent organic framework of the present invention;
FIG. 7 is a graph of the spherical morphology of an electrochemically active ferrocenyl covalent organic framework of the present invention.
Detailed Description
The technical solutions of the present embodiment will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is apparent that the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method for preparing a covalent organic framework material with electrochemical activity, which is characterized by comprising the following specific steps:
step one, preparing electrochemically active COF nano particles;
step two, synthesizing COF/Au (COF/gold nanoparticles);
step three, synthesis of COF/Au/CNT-COOH (COF/gold nanoparticles/carboxylated carbon nanotubes).
In the first step of the embodiment of the invention, the reaction solvent is 8mL of ethanol, acetonitrile or dichloromethane, the reaction monomers are a ternary amino ligand and 1,1' -ferrocene dicarboxaldehyde, the catalyst is 0.2mL of acetic acid, the ternary amino ligand comprises 1,3, 5-tri (4-aminophenyl) benzene, 4- (4-aminophenyl) -2, 6-di (4-aminophenyl) pyridine, tri (4-aminophenyl) amine, 5 ' ' - (4 ' -amino 1,1' -biphenyl 1-4-yl), 4' ' ',4' ' ' ' ' - (1, 3, 5-triazine-2, 4, 6-triyl) tris ([ [1,1' -biphenyl ] -4-amine ])), and N4, N4-bis (4 ' -amino- [1,1' -biphenyl ] -4-yl) - [1,1' -biphenyl ] -4,4' -diamine, and the mass ratio of the 1,1' -ferrocene dicarboxaldehyde is respectively 1:1,2:1,1:2,3:2,2:3, wherein the specific steps for preparing the electrochemically active COF nano particles are as follows:
step A1, mixing ethanol, acetonitrile or dichloromethane, a tertiary amino ligand, 1' -ferrocene dicarboxaldehyde and acetic acid;
step A2, stirring at room temperature for reaction for 12-36 hours to obtain a crude product;
step A3, centrifugally separating the crude product, washing the crude product in ethanol, acetonitrile and dichloromethane three times for purification, and drying the crude product in vacuum at 50-70 ℃ for 6-12 hours to obtain products FC-COF-1 to FC-COF-6.
In the second step of the embodiment of the present invention, the reaction compound synthesized by COF/Au (COF/gold nanoparticle) contains: 1mg of the dried COF nanoparticles prepared in the first step, 5mL of ultrapure water or ethanol, chloroauric acid solution with a concentration of 1.5mg/mL and sodium borohydride solution with a concentration of 1.5mg/mL, and the reaction steps are as follows:
step B1, 1mg of the dried COF nano particles are dispersed in 5mL of ultrapure water or ethanol in an ultrasonic manner to form a reaction system solution;
step B2, sequentially adding chloroauric acid solution with the volume of 0.1mL, 0.2mL, 0.4mL and 0.8mL and the concentration of 1.5mg/mL into the reaction system solution, and stirring at room temperature or carrying out ultrasonic stirring reaction for 2-6 hours to form a mixed reaction system;
step B3, adding a proper amount of sodium borohydride solution with the concentration of 1.5mg/mL into the reaction system rapidly, and continuing stirring at room temperature or ultrasonic stirring for 2 hours to obtain a COF/Au (COF/gold nanoparticles) crude product;
and step B4, centrifugally washing the product, and drying.
In step three of the embodiment of the present invention, the reaction compound synthesized by COF/Au/CNT-COOH (COF/gold nanoparticle/carboxylated carbon nanotube) contains: 1mg of the COF/Au nano-particles and carboxylated carbon nano-tubes prepared in the second step, wherein the reaction steps are as follows:
step C1, dispersing 1mg of the dried COF/Au nanoparticles and CNT-COOH of different masses (0.01 mg, 0.05mg, 0.1mg, 0.5mg, 1mg, 5 mg) in a beaker containing 5mL of ultrapure water, respectively;
step C2, mixing the two solutions in different beakers, performing ultrasonic treatment for 1 hour, and stirring at room temperature for 3 hours;
step C3, centrifuging, washing with water and drying, collecting target COF/Au/CNT-COOH (COF/gold nanoparticles/carboxylated carbon nanotubes) products, which appear as black powder.
According to the embodiment of the invention, the ternary amino ligand and 1,1' -ferrocene dicarboxaldehyde are condensed through Schiff base reaction, ethanol, acetonitrile and methylene dichloride are used as solvents, acetic acid is used as a catalyst, the crude product is obtained after stirring for 12-36 hours at room temperature, the crude product is subjected to centrifugal separation, purification and vacuum drying to obtain a high-yield high-purity product, and then the synthesized novel covalent organic framework is modified by gold nano particles and carboxyl functionalized multiwall carbon nano tubes, so that the conductivity of the material is improved, and the novel covalent organic framework is used for high-sensitivity detection of miRNA in tumor cells.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (1)

1. A method for preparing a covalent organic framework material with electrochemical activity, which is characterized by comprising the following specific steps:
step one, preparing electrochemically active COF nano particles; the reaction solvent is 8mL of ethanol, acetonitrile or methylene dichloride, the reaction monomers are a ternary amino ligand and 1,1 '-ferrocene dicarboxaldehyde, the catalyst is 0.2mL of acetic acid, the ternary amino ligand comprises 1,3, 5-tris (4-aminophenyl) benzene, 4- (4-aminophenyl) -2, 6-bis (4-aminophenyl) pyridine, tris (4-aminophenyl) amine, 5' '- (4' -amino [1,1 '-biphenyl ] -4-yl) [1,1':4', 1' ': 3' ',1' '' -pentabiphenyl ] -4,4'' '-diamine, 4' '',4'' '' - (1, 3, 5-triazine-2, 4, 6-triyl) tris (([ [1,1 '-biphenyl ] -4-amine ])), N4-bis (4' -amino- [1,1 '-biphenyl ] -4-yl) - [1,1' -biphenyl ] -4,4 '-diamine, and the mass ratio of the 1' '-dicarboxaldehyde to the 1,1' -dicarboxaldehyde is respectively: 1,2:1,1:2,3:2,2:3, a step of; the preparation steps of the electrochemically active COF nano-particles specifically comprise:
step A1, mixing ethanol, acetonitrile or dichloromethane, a tertiary amino ligand, 1' -ferrocene dicarboxaldehyde and acetic acid;
step A2, stirring at room temperature for reaction for 12-36 hours to obtain a crude product;
step A3, centrifugally separating the crude product, washing the crude product in ethanol, acetonitrile and methylene dichloride for three times for purification, and vacuum drying the crude product at 50-70 ℃ for 6-12 hours to obtain products FC-COF-1 to FC-COF-6;
step two, synthesizing COF/Au; the reaction compound for synthesizing the COF/Au comprises 1mg of the dried COF nano particles prepared in the first step, 5mL of ultrapure water or ethanol, chloroauric acid solution with the concentration of 1.5mg/mL and sodium borohydride solution with the concentration of 1.5mg/mL, and the reaction steps are as follows:
step B1, 1mg of the dried COF nano particles are dispersed in 5mL of ultrapure water or ethanol in an ultrasonic manner to form a reaction system solution;
step B2, sequentially adding chloroauric acid solution with the volume of 0.1mL, 0.2mL, 0.4mL and 0.8mL and the concentration of 1.5mg/mL into the reaction system solution, and stirring at room temperature or carrying out ultrasonic stirring reaction for 2-6 hours to form a mixed reaction system;
step B3, adding a proper amount of sodium borohydride solution with the concentration of 1.5mg/mL into the reaction system rapidly, and continuing stirring at room temperature or ultrasonic stirring for 2 hours to obtain a COF/Au crude product;
step B4, centrifugally washing and drying the product;
step three, synthesizing COF/Au/CNT-COOH; the method is used for detecting miRNA in tumor cells; the reaction compound synthesized by the COF/Au/CNT-COOH comprises COF/Au nano-particles and carboxylated carbon nano-tubes 1mg prepared in the second step, and the reaction steps are as follows:
step C1, dispersing 1mg of the dried COF/Au nano-particles and CNT-COOH with the mass of 0.01mg, 0.05mg, 0.1mg, 0.5mg, 1mg and 5mg in a beaker containing 5mL of ultrapure water respectively;
step C2, mixing the two solutions in different beakers, performing ultrasonic treatment for 1 hour, and stirring at room temperature for 3 hours;
step C3, centrifuging, washing with water and drying, and collecting target COF/Au/CNT-COOH products.
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