CN107652970B - Preparation method and application of carbon-based nano hybrid material - Google Patents

Preparation method and application of carbon-based nano hybrid material Download PDF

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CN107652970B
CN107652970B CN201710805819.9A CN201710805819A CN107652970B CN 107652970 B CN107652970 B CN 107652970B CN 201710805819 A CN201710805819 A CN 201710805819A CN 107652970 B CN107652970 B CN 107652970B
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卢小泉
张东旭
毛翔
张振
蒲贵强
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Northwest Normal University
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Abstract

The invention discloses a preparation method of a carbon-based nano hybrid material, which comprises the following steps: (1) preparing a nitrogen-doped carbon quantum dot solution by using citric acid as a carbon source and urea as a nitrogen source; (2) mixing the nitrogen-doped carbon quantum dot solution with the phenylalanine amide ligand solution, and respectively adding a carboxyl activating agent 1-ethyl- (3-dimethylaminopropyl) carbonyl diimine hydrochloride, 1-hydroxybenzotriazole and 4-dimethylaminopyridine to prepare an LPQDs solution; (3) adding Cu (NO) to LPQDs solution3)2And (3) reacting the solution to obtain the Cu (II) -LPQDs nano hybrid material. The method adopts non-traditional high-temperature high-pressure hydrothermal reaction to prepare NCQDs, avoids using high-toxicity chemical reagents, and improves the fluorescence property of carbon quantum dots by doping nitrogen elements; compared with a noble metal enzyme catalyst, the invention adopts non-noble metal Cu as a catalytic active center, and the catalytic performance is superior to that of the noble metal enzyme catalyst; cu (II) -LPQDs carbon-based nano hybrid material can be used for H in human cervical carcinoma cells2O2Detection of (3).

Description

Preparation method and application of carbon-based nano hybrid material
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to a preparation method and application of a carbon-based nano hybrid material.
Background
Zero-dimensional nanostructures have been the subject of intense research by researchers due to their interesting properties and unique applications. Carbon Quantum Dots (CQDs) are a novel carbon nanomaterial with a quasi-spherical structure and stable fluorescence performance, and the size of the carbon nanomaterial is less than 10 nm. Compared with the traditional semiconductor quantum dots and organic dyes, CQDs have the characteristics of low toxicity, good dispersibility, strong chemical inertness, simple functionalization, good photobleaching resistance, excellent biocompatibility and the like. Recently, the abundant physicochemical properties of nitrogen-doped nanocarbon materials (graphene, carbon nanotubes, carbon nanofibers, etc.) are receiving attention from researchers due to their ability to induce charge delocalization and adjust the overall function of carbon materials. Copper is the third most abundant soft transition metal ion in the human body, and is also an important mineral nutrient element of mammalian cells, compared to iron and zinc, and at the same time, it serves as a cofactor for many enzymes, in other words, it plays a very important role in various biological processes. Metalloenzymes are conjugated enzymes containing one or more metal ions as prosthetic groups. Among metalloenzymes, metal ions are generally the active center of the enzyme, and most of the enzymes containing zinc, iron and copper, such as iron metalloenzyme-cytochrome C, and also enzymes containing other metal ions such as molybdenum and manganese. For example, cytochrome oxidase contains copper ions in addition to iron ions.
Disclosure of Invention
The first purpose of the invention is to provide a preparation method of carbon-based nano hybrid material.
A second object of the invention is to provide a material obtained according to the above process.
A third object of the invention is to provide the use of the above-mentioned materials.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a carbon-based nano hybrid material comprises the following steps:
(1) dissolving 2.0g of carbon source citric acid and 0.6-1.0g of nitrogen source urea in water, heating and evaporating the obtained mixed solution to dryness, continuously heating and keeping the temperature for 2min, then cooling to room temperature to obtain nitrogen-doped carbon quantum dots (NCQDs), dispersing the nitrogen-doped carbon quantum dots in water, performing dialysis treatment, and refrigerating the obtained nitrogen-doped carbon quantum dot solution for later use;
(2) mixing 10mL of the nitrogen-doped carbon quantum dots (NCQDs) solution obtained in the step (1) with 2mL of a phenylalanine amide Ligand (LPN) solution, respectively adding 5mg of carboxyl activating agents 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride (EDC), 1-Hydroxybenzotriazole (HOBT) and 4-Dimethylaminopyridine (DMAP), stirring for reaction, and then performing dialysis treatment to obtain an LPQDs solution for cold storage for later use;
(3) adding 2mL of Cu (NO) into the LPQDs solution obtained in the step (2)3)2And (3) reacting the solution to obtain the Cu (II) -LPQDs carbon-based nano hybrid material.
Further, in the step (1), the water is ultrapure water, a carbon source of citric acid and a nitrogen source of urea are dissolved in 10mL of water, and nitrogen-doped carbon quantum dots are dispersed in 100mL of water;
the temperature for heating and drying the mixed solution is 120 ℃, and the temperature is increased to 180-220 ℃;
the dialysis treatment method comprises dialyzing with 1KD dialysis bag for 12 h;
the refrigeration temperature was 4 ℃.
Further, in the step (2), the concentration of the solution of the phenylalanine amide Ligand (LPN) is 10 mmol/L;
the stirring reaction time is 12 hours;
the dialysis treatment method comprises dialyzing with 1KD dialysis bag for 12 h;
the refrigeration temperature was 4 ℃.
Further, in the step (3), Cu (NO)3)2The concentration of the solution is 10 mmol/L;
the reaction time was 4 h.
The carbon-based nano hybrid material prepared by any one of the methods.
The carbon-based nano hybrid material prepared by any method is used for detecting H in human cervical cancer cells2O2
In the invention, the NCQDs have amino groups and a large number of carboxyl groups on the surface, the LPN ligand containing the amino groups is modified on the NCQDs in a chemical bond mode, LPN ligand molecules are successfully grafted on the NCQDs, and N atoms in the LPN amino functional groups and Cu are utilized2+Coordinating, generating toolCu (II) -LPQDs carbon-based nano hybrid material with peroxidase-like activity utilizes the excellent catalytic activity of Cu-N bond and the synergistic effect of the Cu (II) -LPQDs carbon-based nano hybrid material and nano nitrogen-doped carbon quantum dots, and passes through TMB-H2O2System implementation H2O2A dual visualization/fluorescence detection process of molecules.
The invention has the following beneficial effects:
(1) citric acid is used as a carbon source, urea is used as a nitrogen source, and a non-traditional high-temperature high-pressure hydrothermal reaction is adopted to prepare NCQDs, so that a high-toxicity chemical reagent is avoided, the fluorescence property of carbon quantum dots is improved by doping nitrogen elements, and the NCQDs with good fluorescence property are prepared and used for constructing substrates of metalloenzymes;
(2) compared with noble metal enzyme catalysts (Au, Ag, Pt and Pd) (DFT theoretical calculation), the invention adopts non-noble metal Cu as a catalytic active center, and the catalytic performance is superior to that of the noble metal enzyme catalysts;
(3) the Cu (II) -LPQDs carbon-based nano hybrid material has peroxidase-like activity and plays an important role in sensing;
(4) cu (II) -LPQDs carbon-based nano hybrid material can be used for H in human cervical cancer cells (Hela cells)2O2Detection of (3).
Drawings
FIG. 1 is a scheme for preparing NCQDs according to the present invention;
FIG. 2 is a schematic diagram of the preparation route of Cu (II) -LPQDs carbon-based nano-hybrid materials of the invention;
FIG. 3 is a transmission electron micrograph and an XPS characterization of NCQDs of the present invention;
FIG. 4 is an infrared spectrum of NCQDs of the present invention and conventional CQDs;
FIG. 5 is a UV spectrum of NCQDs of the present invention and conventional CQDs;
FIG. 6 is a graph showing fluorescence spectra of NCQDs of the present invention and conventional CQDs;
FIG. 7 shows that the Cu (II) -LPQDs carbon-based nano hybrid material of the invention is used for H in human cervical cancer cells (Hela cells)2O2Detection of (3).
Detailed Description
In order to further highlight the objects, technical solutions and advantages of the present invention, the present invention is further described with reference to the following examples, but the present invention is not limited to the scope of the examples.
Example 1
The preparation method of the Cu (II) -LPQDs carbon-based nano hybrid material comprises the following steps:
(1) 2.0g of citric acid and 0.8g of urea are weighed, mixed and dissolved in 10mL of ultrapure water to form a uniform mixed solution, wherein citric acid is used as a carbon source, and urea is used as a nitrogen source. The mixed system is placed in an electric heating jacket and heated to 120 ℃, after the solvent is evaporated to dryness, the temperature is raised to 180 ℃, the temperature is kept for 2 minutes, and the mixed system is cooled to the room temperature. The brown viscous oily substance NCQDs is obtained, ultrasonically dispersed in 100mL of ultrapure water, dialyzed for 12 hours by a 1KD dialysis bag and stored at 4 ℃ for later use.
(2) 10mL of the prepared NCQDs were mixed with 2mL of LPN (10mmol/L) in a 50mL round-bottomed flask, and 5mg each of carboxyl activating agents 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride (EDC), 1-Hydroxybenzotriazole (HOBT) and 4-Dimethylaminopyridine (DMAP) was added. Stirring to react for 12 hours, dialyzing for 12 hours by a dialysis bag with 1KD to obtain brown yellow liquid LPQDs, and storing at 4 ℃ for later use.
(3) 2mL of Cu (NO) was added to the prepared LPQDs3)2(10mmol/L) and reacting for 4 hours to obtain the final product Cu (II) -LPQDs carbon-based nano hybrid material.
The material is used for detecting H in fresh milk and human cervical cancer cells (Hela cells)2O2
Example 2
The preparation method of the Cu (II) -LPQDs carbon-based nano hybrid material comprises the following steps:
(1) 2.0g of citric acid and 0.6g of urea are weighed, mixed and dissolved in 10mL of ultrapure water to form a uniform mixed solution, wherein citric acid is used as a carbon source, and urea is used as a nitrogen source. The mixed system is placed in an electric heating jacket and heated to 120 ℃, after the solvent is evaporated to dryness, the temperature is raised to 180 ℃, the temperature is kept for 2 minutes, and the mixed system is cooled to the room temperature. The brown viscous oily substance NCQDs is obtained, ultrasonically dispersed in 100mL of ultrapure water, dialyzed for 12 hours by a 1KD dialysis bag and stored at 4 ℃ for later use.
(2) 10mL of the prepared NCQDs were mixed with 2mL of LPN (10mmol/L) in a 50mL round-bottomed flask, and 5mg each of carboxyl activating agents 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride (EDC), 1-Hydroxybenzotriazole (HOBT) and 4-Dimethylaminopyridine (DMAP) was added. Stirring to react for 12 hours, dialyzing for 12 hours by a dialysis bag with 1KD to obtain brown yellow liquid LPQDs, and storing at 4 ℃ for later use.
(3) 2mL of Cu (NO) was added to the prepared LPQDs3)2(10mmol/L) and reacting for 4 hours to obtain the final product Cu (II) -LPQDs carbon-based nano hybrid material.
The material is used for detecting H in fresh milk and human cervical cancer cells (Hela cells)2O2
Example 3
The preparation method of the Cu (II) -LPQDs carbon-based nano hybrid material comprises the following steps:
(1) 2.0g of citric acid and 0.6g of urea are weighed, mixed and dissolved in 10mL of ultrapure water to form a uniform mixed solution, wherein citric acid is used as a carbon source, and urea is used as a nitrogen source. The mixed system is placed in an electric heating jacket and heated to 120 ℃, after the solvent is evaporated to dryness, the temperature is raised to 180 ℃, the temperature is kept for 2 minutes, and the mixed system is cooled to the room temperature. The brown viscous oily substance NCQDs is obtained, ultrasonically dispersed in 100mL of ultrapure water, dialyzed for 12 hours by a 1KD dialysis bag and stored at 4 ℃ for later use.
(2) 10mL of the prepared NCQDs were mixed with 2mL of LPN (10mmol/L) in a 50mL round-bottomed flask, and 5mg each of carboxyl activating agents 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride (EDC), 1-Hydroxybenzotriazole (HOBT) and 4-Dimethylaminopyridine (DMAP) was added. Stirring to react for 12 hours, dialyzing for 12 hours by a dialysis bag with 1KD to obtain brown yellow liquid LPQDs, and storing at 4 ℃ for later use.
(3) 2mL of Cu (NO) was added to the prepared LPQDs3)2(10mmol/L) and reacting for 4 hours to obtain the final product Cu (II) -LPQDs carbon-based nano hybrid material.
The material is used for detecting H in fresh milk and human cervical cancer cells (Hela cells)2O2
Example 4
The preparation method of the Cu (II) -LPQDs carbon-based nano hybrid material comprises the following steps:
(1) 2.0g of citric acid and 0.6g of urea are weighed, mixed and dissolved in 10mL of ultrapure water to form a uniform mixed solution, wherein citric acid is used as a carbon source, and urea is used as a nitrogen source. The mixed system is placed in an electric heating jacket and heated to 120 ℃, after the solvent is evaporated to dryness, the temperature is raised to 180 ℃, the temperature is kept for 2 minutes, and the mixed system is cooled to the room temperature. The brown viscous oily substance NCQDs is obtained, ultrasonically dispersed in 100mL of ultrapure water, dialyzed for 12 hours by a 1KD dialysis bag and stored at 4 ℃ for later use.
(2) 10mL of the prepared NCQDs were mixed with 2mL of LPN (10mmol/L) in a 50mL round-bottomed flask, and 5mg each of carboxyl activating agents 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride (EDC), 1-Hydroxybenzotriazole (HOBT) and 4-Dimethylaminopyridine (DMAP) was added. Stirring to react for 12 hours, dialyzing for 12 hours by a dialysis bag with 1KD to obtain brown yellow liquid LPQDs, and storing at 4 ℃ for later use.
(3) 2mL of Cu (NO) was added to the prepared LPQDs3)2(10mmol/L) and reacting for 4 hours to obtain the final product Cu (II) -LPQDs carbon-based nano hybrid material.
The material is used for detecting H in fresh milk and human cervical cancer cells (Hela cells)2O2
Example 5
The preparation method of the Cu (II) -LPQDs carbon-based nano hybrid material comprises the following steps:
(1) 2.0g of citric acid and 0.6g of urea are weighed, mixed and dissolved in 10mL of ultrapure water to form a uniform mixed solution, wherein citric acid is used as a carbon source, and urea is used as a nitrogen source. The mixed system is placed in an electric heating jacket and heated to 120 ℃, after the solvent is evaporated to dryness, the temperature is raised to 180 ℃, the temperature is kept for 2 minutes, and the mixed system is cooled to the room temperature. The brown viscous oily substance NCQDs is obtained, ultrasonically dispersed in 100mL of ultrapure water, dialyzed for 12 hours by a 1KD dialysis bag and stored at 4 ℃ for later use.
(2) 10mL of the prepared NCQDs were mixed with 2mL of LPN (10mmol/L) in a 50mL round-bottomed flask, and 5mg each of carboxyl activating agents 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride (EDC), 1-Hydroxybenzotriazole (HOBT) and 4-Dimethylaminopyridine (DMAP) was added. Stirring to react for 12 hours, dialyzing for 12 hours by a dialysis bag with 1KD to obtain brown yellow liquid LPQDs, and storing at 4 ℃ for later use.
(3) 2mL of Cu (NO) was added to the prepared LPQDs3)2(10mM) and reacting for 4 hours to obtain the final product Cu (II) -LPQDs carbon-based nano hybrid material.
The material is used for detecting H in fresh milk and human cervical cancer cells (Hela cells)2O2
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A preparation method of a carbon-based nano hybrid material is characterized by comprising the following steps:
(1) dissolving 2.0g of carbon source citric acid and 0.6-1.0g of nitrogen source urea in water, heating and evaporating the obtained mixed solution to dryness, continuously heating and keeping the temperature for 2min, then cooling to room temperature to obtain nitrogen-doped carbon quantum dots, dispersing the nitrogen-doped carbon quantum dots in water, carrying out dialysis treatment, and refrigerating the obtained nitrogen-doped carbon quantum dot solution for later use;
(2) mixing 10mL of the nitrogen-doped carbon quantum dot solution obtained in the step (1) with 2mL of a phenylalanine amide ligand solution, respectively adding 5mg of each of a carboxyl activating agent 1-ethyl- (3-dimethylaminopropyl) carbonyldiimine hydrochloride, 1-hydroxybenzotriazole and 4-dimethylaminopyridine, carrying out stirring reaction, then carrying out dialysis treatment, and refrigerating the obtained LPQDs solution for later use;
(3) adding 2mL of Cu (NO) into the LPQDs solution obtained in the step (2)3)2And (3) reacting the solution to obtain the Cu (II) -LPQDs carbon-based nano hybrid material.
2. The preparation method of the carbon-based nano-hybrid material according to claim 1, wherein in the step (1), the carbon source of citric acid and the nitrogen source of urea are dissolved in 10mL of water, the nitrogen-doped carbon quantum dots are dispersed in 100mL of water, and the water is ultrapure water;
the temperature for heating and drying the mixed solution is 120 ℃, and the temperature is increased to 180-220 ℃;
the dialysis treatment method comprises dialyzing with 1KD dialysis bag for 12 h;
the refrigeration temperature was 4 ℃.
3. The preparation method of carbon-based nano-hybrid material according to claim 1, wherein in the step (2), the concentration of the solution of the phenylalanine amide ligand is 10 mmol/L;
the stirring reaction time is 12 hours;
the dialysis treatment method comprises dialyzing with 1KD dialysis bag for 12 h;
the refrigeration temperature was 4 ℃.
4. The method for preparing carbon-based nano-hybrid material according to claim 1, wherein in the step (3), Cu (NO)3)2The concentration of the solution is 10 mmol/L;
the reaction time was 4 h.
5. Carbon-based nanohybrid materials prepared according to the process of any of claims 1 to 4.
6. Use of carbon-based nano-hybrid material prepared according to any one of claims 1 to 4 for detecting H in human cervical cancer cells2O2
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