CN109298038B - MnCo2O4Preparation method and application of polyaniline modified glassy carbon electrode - Google Patents
MnCo2O4Preparation method and application of polyaniline modified glassy carbon electrode Download PDFInfo
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Abstract
The invention discloses MnCo2O4A preparation method of a polyaniline compound modified glassy carbon electrode and a method for electrochemically detecting quercetin by using the electrode. The preparation method comprises the step of adding CoCl2·6H2O，MnCl2·H2Hydrothermal method for preparing MnCo by dispersing O, ammonium fluoride and hexamethylenetetramine in aqueous solution2O4Modifying the surface of a glassy carbon electrode with the polyaniline modified surface by an electrochemical polymerization method to obtain MnCo2O4The polyaniline compound modified glassy carbon electrode adopts differential pulse voltammetry to detect quercetin, has wide linear range and high sensitivity, can be used for multiple times and is convenient to operate.
Description
Technical Field
The invention relates to the field of electrochemistry, in particular to MnCo2O4A preparation method of a polyaniline modified glassy carbon electrode and application of the electrode to electrochemical detection of quercetin.
Background
Quercetin (Quercetin) is contained in flowers, leaves and fruits of many plants, and is mostly present in the form of glycoside, such as rutin (rutin), Quercetin, hyperin and other plants, and has high content, and is Quercetin, wherein double bonds are arranged between 2 and 3 positions in the molecule, and 2 hydroxyls are arranged at 37 and 47 positions, so that the Quercetin (Quercetin) has the function of being used as a free radical acceptor generated in oxidation processes of metal chelation or grease and the like, can be used as an antioxidant of grease and ascorbic acid, can be used as a medicine, has good phlegm eliminating and cough relieving effects, and has certain asthma relieving effect. In addition, it also has effects of lowering blood pressure, enhancing capillary resistance, reducing capillary fragility, reducing blood lipid, dilating coronary artery, and increasing coronary blood flow. Can be used for treating chronic bronchitis. It also has adjuvant therapeutic effect on coronary heart disease and hypertension.
In the prior art, the detection of quercetin mainly comprises high performance liquid chromatography, ultraviolet spectrophotometry, chemiluminescence and the like. For example, patent CN107941951A discloses a method for measuring quercetin by HPLC-DAD detection method. However, liquid chromatography takes a long time to detect quercetin, and a relatively complicated extraction process is involved before detection by ultraviolet spectrophotometry. As the flavonoid can generate oxidation-reduction reaction on the surface of the electrode, compared with the previous methods, the electrochemical technology has the advantages of good selectivity, high sensitivity, less time consumption, low detection limit, high response speed and the like, and expensive instruments are not needed.
The manganese cobaltate has a spinel structure, can form various different shapes, has excellent electric and magnetic properties, has wide application in the fields of magnetic semiconductors, lithium ion battery electrode materials, electrode materials of supercapacitors and the like, and is also used for manufacturing sensors and the like. However, modified electrodes based on manganese cobaltate/polyaniline and a method for detecting quercetin by adopting manganese cobaltate/polyaniline modified glassy carbon electrodes are not reported.
Disclosure of Invention
The invention aims to provide a manganese cobaltate/polyaniline modified glassy carbon electrode which is applied to electrochemical detection of quercetin, the detection method is simple and accurate, the linear range of electrochemical detection of quercetin is expanded, and the sensitivity is improved.
The purpose of the invention is realized as follows:
MnCo2O4The preparation method of the polyaniline modified glassy carbon electrode is characterized by comprising the following steps:
(1) pretreating a glassy carbon electrode: polishing the glassy carbon electrode to a mirror surface by using 0.3, 0.1 and 0.05 mu m of alumina powder in sequence, and then respectively ultrasonically cleaning for 3min by using ethanol and deionized water in sequence to obtain a pretreated glassy carbon electrode;
(2)MnCo2O4the preparation of (1): adding CoCl2·6H2O,MnCl2·H2O, ammonium fluoride, hexamethylenetetramine in a molar ratio of 1: 1: 4-6: dissolving the 10 proportion in 100mL deionized water, performing ultrasonic treatment for 4-6min to form a uniform solution, transferring the solution to a high-pressure reaction kettle, reacting for 10-14 h at the temperature of 100-;
(3) preparation of MnCo2O4Nanoparticle-modified glassy carbon electrodes: 50mgMnCo2O4Dispersing the nanoparticles in water solution containing 0.5% Nafion by ultrasonic wave, coating 20 μ L on the surface of glassy carbon electrode, drying under infrared lamp to obtain MnCo2O4A glassy carbon electrode decorated with nanoparticles;
(4) preparation of MnCo2O4Polyaniline modified glassy carbon electrode: 300mg of aniline monomer is dissolved in 20mL of acidic aqueous solution, the pH value of the acidic aqueous solution is 3-5, ultrasonic treatment is carried out for 2min, and MnCo is subjected to ultrasonic treatment2O4Placing the modified glassy carbon electrode in the aqueous solution, performing electrochemical polymerization by using a platinum electrode as a counter electrode and Ag/AgCl as a reference electrode through cyclic voltammetry, and electrochemically polymerizing aniline in MnCo2O4Modifying the surface of a glassy carbon electrode, washing with deionized water, and drying under an infrared lamp to obtain MnCo2O4Polyaniline modified glassy carbon electrode.
Further, CoCl in the step (2)2·6H2O,MnCl2·H2The molar ratio of O, ammonium fluoride and hexamethylenetetramine is 1: 1: 5: 10.
further, in the step (2), the reaction time is 12 hours, the ultrasonic time is 5min, the calcining temperature is 350 ℃, and the heating rate is 2 ℃/min.
Further, in the step (4), the acidic aqueous solution contains sulfuric acid and has a pH of 4.
The invention relates to MnCo2O4Application of polyaniline modified glassy carbon electrode, wherein MnCo2O4The polyaniline modified glassy carbon electrode is prepared by adopting any one of the methods; the application is to mix MnCo2O4The polyaniline modified glassy carbon electrode is applied to electrochemical detection of quercetin.
Further, the step of electrochemically detecting quercetin comprises:
a. adopting PBS buffer solution to prepare quercetin aqueous solutions with different concentrations;
b. mixing MnCo2O4The polyaniline modified glassy carbon electrode is used as a working electrode, the platinum electrode is used as a counter electrode, the Ag/AgCl electrode is used as a reference electrode to form a three-electrode system, and the three-electrode system is placed in the quercetin aqueous solution;
c. carrying out electrochemical detection on the quercetin by adopting a differential pulse voltammetry method to obtain peak currents corresponding to the quercetin with different concentrations;
d. taking the peak current as a vertical coordinate and the concentration as a horizontal coordinate to make a standard curve;
e. and placing the three-electrode system in the quercetin aqueous solution with unknown depth to obtain a differential pulse voltammetry curve and a peak current of the quercetin aqueous solution with unknown concentration, and obtaining the concentration of the quercetin according to a standard curve.
Further, the concentrations of the quercetin aqueous solutions with different concentrations are respectively as follows: 5.0X 10-8mol/L， 1.0×10-7mol/L，5.0×10-7mol/L，1.0×10-6mol/L，5.0×10-6mol/L。
Further, the electrochemical parameters of the differential pulse voltammetry are as follows: the scanning potential range is 0-0.6V, and the scanning speed is 100 mV/s.
Furthermore, the detection limit of the differential pulse voltammetry for detecting the quercetin is 1.0 multiplied by 10-8mol/L, linear range of 5.0X 10-8mol/L-5.0×10-6mol/L。
Compared with the prior art, the electrode prepared by the invention is simple in equipment, convenient to operate and short in detection time compared with other methods for detecting the quercetin by electrochemical detection; compared with other electrodes and electrochemical methods, the manganese cobaltate prepared by the method has a dendritic structure and excellent conductivity, and the electrochemical polymerization of the polyaniline material can be formed in the dendritic structure, so that the catalytic effect of the electrode is improved, and the electrode prepared by the method has the advantages of high sensitivity, wide linear range and high accuracy when used for detecting quercetin.
Drawings
FIG. 1 is MnCo2O4The peak current-concentration standard curve is obtained by detecting quercetin by polyaniline modified glassy carbon electrode differential pulse voltammetry.
Detailed Description
The invention is further described with reference to the accompanying drawings, which are not intended to be limiting in any way, and any variations based on the teachings of the invention are intended to fall within the scope of the invention.
Example 1
(1) Pretreating a glassy carbon electrode: polishing the glassy carbon electrode to a mirror surface by using 0.3, 0.1 and 0.05 mu m of alumina powder in sequence, and then respectively ultrasonically cleaning for 3min by using ethanol and deionized water in sequence to obtain a pretreated glassy carbon electrode;
(2)MnCo2O4the preparation of (1): adding CoCl2·6H2O,MnCl2·H2O, ammonium fluoride, hexamethylenetetramine in a molar ratio of 1: 1: 4: dissolving 10 in 100mL of deionized water, performing ultrasonic treatment for 4min to form a uniform solution, transferring the solution to a high-pressure reaction kettle, reacting for 10 hours at 100 ℃, cooling to room temperature after the reaction is finished, filtering the product, respectively washing with acetone and deionized water, performing vacuum drying at 50 ℃ for 8 hours, and calcining the dried product at 300 ℃ for 2 hours to obtain MnCo2O4A nanoparticle; for the obtained MnCo2O4The nano particles are analyzed by an electron microscope, and the nano particles have dendritic structures.
(3) Preparation of MnCo2O4Nanoparticle-modified glassy carbon electrodes: 50mg of MnCo2O4Dispersing the nanoparticles in 0.5% Nafion water solution by ultrasonic wave, and collecting 20 μ LCoating on the surface of a glassy carbon electrode, and drying under an infrared lamp to obtain MnCo2O4A glassy carbon electrode decorated with nanoparticles;
(4) preparation of MnCo2O4Polyaniline modified glassy carbon electrode: 300mg aniline monomer was dissolved in 20mL acidic aqueous solution (pH 3), sonicated for 2min, and MnCo was added2O4Placing the modified glassy carbon electrode in the aqueous solution, performing electrochemical polymerization by using a platinum electrode as a counter electrode and Ag/AgCl as a reference electrode through cyclic voltammetry, and electrochemically polymerizing aniline in MnCo2O4Modifying the surface of a glassy carbon electrode, washing with deionized water, and drying under an infrared lamp to obtain MnCo2O4Polyaniline modified glassy carbon electrode.
Example 2
(1) Pretreating a glassy carbon electrode: polishing the glassy carbon electrode to a mirror surface by using 0.3, 0.1 and 0.05 mu m of alumina powder in sequence, and then respectively ultrasonically cleaning for 3min by using ethanol and deionized water in sequence to obtain a pretreated glassy carbon electrode;
(2)MnCo2O4the preparation of (1): adding CoCl2·6H2O,MnCl2·H2O, ammonium fluoride, hexamethylenetetramine in a molar ratio of 1: 1: 6: dissolving 10 in 100mL of deionized water, performing ultrasonic treatment for 6min to form a uniform solution, transferring the solution into a high-pressure reaction kettle, reacting for 14 hours at 140 ℃, cooling to room temperature after the reaction is finished, filtering the product, respectively washing with acetone and deionized water, performing vacuum drying at 50 ℃ for 8 hours, calcining the dried product at 400 ℃ for 2 hours to obtain MnCo2O4A nanoparticle; for the obtained MnCo2O4The nano particles are analyzed by an electron microscope, and the nano particles have dendritic structures;
(3) preparation of MnCo2O4Nanoparticle-modified glassy carbon electrodes: 50mg of MnCo2O4Dispersing the nanoparticles in water solution containing 0.5% Nafion by ultrasonic wave, coating 20 μ L on the surface of glassy carbon electrode, drying under infrared lamp to obtain MnCo2O4A glassy carbon electrode decorated with nanoparticles;
(4) preparation of MnCo2O4Polyaniline modified glassy carbon electrode: 300mg aniline monomer was dissolved in 20mL acidic aqueous solution (pH 5), sonicated for 2min, and MnCo was added2O4Placing the modified glassy carbon electrode in the aqueous solution, performing electrochemical polymerization by using a platinum electrode as a counter electrode and Ag/AgCl as a reference electrode through cyclic voltammetry, and electrochemically polymerizing aniline in MnCo2O4Modifying the surface of a glassy carbon electrode, washing with deionized water, and drying under an infrared lamp to obtain MnCo2O4Polyaniline modified glassy carbon electrode.
Example 3
(1) Pretreating a glassy carbon electrode: polishing the glassy carbon electrode to a mirror surface by using 0.3, 0.1 and 0.05 mu m of alumina powder in sequence, and then respectively ultrasonically cleaning for 3min by using ethanol and deionized water in sequence to obtain a pretreated glassy carbon electrode;
(2)MnCo2O4the preparation of (1): adding CoCl2·6H2O,MnCl2·H2O, ammonium fluoride, hexamethylenetetramine in a molar ratio of 1: 1: 5: dissolving 10 in 100mL of deionized water, performing ultrasonic treatment for 5min to form a uniform solution, transferring the solution to a high-pressure reaction kettle, reacting at 120 ℃ for 12 hours, cooling to room temperature after the reaction is finished, filtering the product, respectively washing with acetone and deionized water, performing vacuum drying at 50 ℃ for 8 hours, and calcining the dried product at 350 ℃ for 2 hours to obtain MnCo2O4A nanoparticle; for the obtained MnCo2O4The nano particles are analyzed by an electron microscope, and the nano particles have dendritic structures;
(3) preparation of MnCo2O4Nanoparticle-modified glassy carbon electrodes: 50mg of MnCo2O4Dispersing the nanoparticles in water solution containing 0.5% Nafion by ultrasonic wave, coating 20 μ L on the surface of glassy carbon electrode, drying under infrared lamp to obtain MnCo2O4A glassy carbon electrode decorated with nanoparticles;
(4) preparation of MnCo2O4Polyaniline modified glassy carbon electrode: 300mg aniline monomer was dissolved in 20mL acidic aqueous solution (pH 4), sonicated for 2min, and MnCo was added2O4The modified glassy carbon electrode is put into the aqueous solution and is electrified by platinumPerforming electrochemical polymerization by cyclic voltammetry with counter electrode of Ag/AgCl as reference electrode to obtain MnCo2O4Modifying the surface of a glassy carbon electrode, washing with deionized water, and drying under an infrared lamp to obtain MnCo2O4Polyaniline modified glassy carbon electrode.
Example 4
The concentrations of the prepared PBS buffer solutions are respectively 5.0 multiplied by 10-8mol/L，1.0×10-7mol/L，5.0 ×10- 7mol/L，1.0×10-6mol/L，5.0×10-6A mol/L quercetin water solution; the MnCo2O 4/polyaniline modified glassy carbon electrode prepared in the embodiment 3 is used as a working electrode, a platinum electrode is used as a counter electrode, Ag/AgCl is used as a reference electrode to form a three-electrode system, and the three-electrode system is placed in a quercetin aqueous solution;
performing electrochemical detection on quercetin by adopting a differential pulse voltammetry, wherein the scanning potential range is 0-0.6V, and the scanning speed is 100mV/s, so as to obtain peak currents corresponding to quercetin with different concentrations; the peak current is used as the ordinate, the concentration is used as the abscissa, and a standard curve is made as shown in figure 1; the detection limit is 1.0 multiplied by 10-8mol/L, linear range of 5.0X 10-8mol/L-5.0×10-6mol/L。
And placing the three-electrode system in the quercetin aqueous solution with unknown depth to obtain a differential pulse voltammetry curve and a peak current of the quercetin aqueous solution with unknown concentration, and obtaining the concentration of the quercetin according to a standard curve.
In summary, the detection method of the present invention employs CoCl2·6H2O,MnCl2·H2Hydrothermal method for preparing MnCo by dispersing O, ammonium fluoride and hexamethylenetetramine in aqueous solution2O4Modifying the surface of a glassy carbon electrode with the polyaniline modified surface by an electrochemical polymerization method to obtain MnCo2O4The polyaniline compound modified glassy carbon electrode adopts differential pulse voltammetry to detect quercetin, has wide linear range and high sensitivity, can be used for multiple times and is convenient to operate.
The foregoing is directed to the preferred embodiment of the present invention and is not intended to limit the invention to the specific embodiment described. It will be apparent to those skilled in the art that various modifications, equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are intended to be included within the scope of the invention.
Claims (9)
1. MnCo2O4The preparation method of the polyaniline modified glassy carbon electrode is characterized by comprising the following steps:
(1) pretreating a glassy carbon electrode: polishing the glassy carbon electrode to a mirror surface by using 0.3, 0.1 and 0.05 mu m of alumina powder in sequence, and then respectively ultrasonically cleaning for 3min by using ethanol and deionized water in sequence to obtain a pretreated glassy carbon electrode;
(2)MnCo2O4the preparation of (1): adding CoCl2·6H2O,MnCl2·H2O, ammonium fluoride, hexamethylenetetramine in a molar ratio of 1: 1: 4-6: dissolving 10 in 100mL of deionized water, performing ultrasonic treatment for 4-6min to form a uniform solution, transferring the solution to a high-pressure reaction kettle, reacting at the temperature of 100 ℃ and 140 ℃ for 10-14 h, cooling to room temperature after the reaction is finished, filtering the product, washing with acetone and deionized water respectively, performing vacuum drying at the temperature of 50 ℃ for 8h, calcining the dried product at the temperature of 300 ℃ and 400 ℃ for 2h to obtain MnCo2O4A nanoparticle;
(3) preparation of MnCo2O4Nanoparticle-modified glassy carbon electrodes: 50mgMnCo2O4Ultrasonically dispersing the nano particles in an aqueous solution containing 0.5 percent of Nafion, coating 20 mu L of the nano particles on the surface of a glassy carbon electrode, and drying the glassy carbon electrode under an infrared lamp to obtain the MnCo2O4 nano particle modified glassy carbon electrode;
(4) preparation of MnCo2O4Polyaniline modified glassy carbon electrode: 300mg of aniline monomer is dissolved in 20mL of acidic aqueous solution, the pH value of the acidic aqueous solution is 3-5, ultrasonic treatment is carried out for 2min, and MnCo is subjected to ultrasonic treatment2O4Placing the modified glassy carbon electrode in the aqueous solution, performing electrochemical polymerization by using a platinum electrode as a counter electrode and Ag/AgCl as a reference electrode through cyclic voltammetry, and electrochemically polymerizing aniline in MnCo2O4Modifying the surface of a glassy carbon electrode, washing with deionized water, and drying under an infrared lamp to obtain MnCo2O4Polyaniline modified glassy carbon electrode.
2. The method of claim 1, wherein the CoCl in step (2)2·6H2O,MnCl2·H2The molar ratio of O, ammonium fluoride and hexamethylenetetramine is 1: 1: 5: 10.
3. the preparation method according to claim 1, wherein the reaction time in the step (2) is 12 hours, the ultrasonic time is 5min, the calcination temperature is 350 ℃, and the temperature increase rate is 2 ℃/min.
4. The method according to claim 1, wherein in the step (4), the acidic aqueous solution contains sulfuric acid and has a pH of 4.
5. MnCo2O4The application of polyaniline modified glassy carbon electrode is characterized in that MnCo2O4The polyaniline modified glassy carbon electrode is prepared by the method of any one of claims 1 to 4; the application is to mix MnCo2O4The polyaniline modified glassy carbon electrode is applied to electrochemical detection of quercetin.
6. The use of claim 5, wherein: the electrochemical detection of quercetin comprises the following steps:
a. adopting PBS buffer solution to prepare quercetin aqueous solutions with different concentrations;
b. mixing MnCo2O4The polyaniline modified glassy carbon electrode is used as a working electrode, the platinum electrode is used as a counter electrode, the Ag/AgCl electrode is used as a reference electrode to form a three-electrode system, and the three-electrode system is placed in the quercetin aqueous solution;
c. carrying out electrochemical detection on the quercetin by adopting a differential pulse voltammetry method to obtain peak currents corresponding to the quercetin with different concentrations;
d. taking the peak current as a vertical coordinate and the concentration as a horizontal coordinate to make a standard curve;
e. and placing the three-electrode system in the quercetin aqueous solution with unknown depth to obtain a differential pulse voltammetry curve and a peak current of the quercetin aqueous solution with unknown concentration, and obtaining the concentration of the quercetin according to a standard curve.
7. The use of claim 6, wherein: the concentrations of the quercetin water solutions with different concentrations are respectively as follows: 5.0X 10-8mol/L，1.0×10-7mol/L，5.0×10-7mol/L，1.0×10-6mol/L，5.0×10-6mol/L。
8. Use according to claim 6, wherein the electrochemical parameters of differential pulse voltammetry are: the scanning potential range is 0-0.6V, and the scanning speed is 100 mV/s.
9. The use of claim 8, wherein: the detection limit of differential pulse voltammetry for detecting quercetin is 1.0 multiplied by 10-8mol/L, linear range of 5.0X 10-8mol/L-5.0×10-6mol/L。
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