CN112345604A - Nano bismuth-polypyrrole composite electrode, preparation method thereof and application of nano bismuth-polypyrrole composite electrode in heavy metal ion detection - Google Patents
Nano bismuth-polypyrrole composite electrode, preparation method thereof and application of nano bismuth-polypyrrole composite electrode in heavy metal ion detection Download PDFInfo
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Abstract
The invention provides a nano bismuth-polypyrrole composite electrode, a preparation method thereof and application thereof in heavy metal ion detection. The invention adopts an electrochemical in-situ modification method to modify a metal film layer on the surface of a polymer in situ, and compounds the polypyrrole with a net structure and the nano metal bismuth with catalytic activity, so that metal ions can pass through the composite material, and suspended substances with larger volume are difficult to pass through the composite material, thereby greatly improving the sensitivity of the electrode on the detection of the metal ions and reducing the detection limit. The composite structure of the copolymer and the metal on the surface of the electrode increases the stability of the electrode, so that the electrode can be recycled, and the problem of electrode sensitivity in trace metal pollutant detection is solved. The composite electrode can be used for heavy metal ion detection, and specifically can simultaneously detect Zn2+、Pb2+And Cd2+Ions.
Description
Technical Field
The invention belongs to the field of electrochemical sensors, and relates to a nano bismuth-polypyrrole composite electrode, a preparation method thereof and application thereof in heavy metal ion detection.
Background
At present, the ubiquitous problem of metal pollution is of high concern, and even a very small amount of metal can cause great harm to human bodies. Therefore, quantitative detection of trace metals in the fields of medicine, food, clinical and environmental fields is very important.
There are many methods for detecting and analyzing metal elements, such as molecular spectroscopy, atomic spectroscopy, mass spectrometry, chromatography, electrochemical analysis, and the like. These methods have been long, but they have had their own disadvantages. Compared with other detection methods, the electrochemical analysis method has the advantages of higher sensitivity, high analysis speed, simple instrument and equipment, easy miniaturization and integration, and contribution to realizing field detection and online real-time monitoring. Mercury membrane electrodes and mercury dropping electrodes have been common electrodes in trace element detection by electrochemical methods, but the toxicity of mercury and the inconvenience in storage and transportation limit its wide application.
In contrast, the bismuth membrane electrode has high sensitivity and good reproducibility, and bismuth is environment-friendly and is a green pollution-free metal element detection electrode. However, the bismuth membrane electrode has the problems of single structure, poor solution tolerance, poor stability and the like. Therefore, the polypyrrole/bismuth composite electrode adopts an electrodeposition method, the polypyrrole with a net structure and the nano metal bismuth with catalytic activity are compounded to form the Bi @ Ppy composite electrode, the special electrode structure greatly improves the detection sensitivity and the stability of the electrode, and the instant detection of metal ion pollutants can be realized.
In summary, in view of the increasing requirements for environmental protection and life health, there is a need in the art for a sensing device that has a simple preparation process, can rapidly detect metal contaminants, and can rapidly detect metals in an industrial process.
Disclosure of Invention
The invention aims to provide a nano bismuth-polypyrrole composite electrode, a preparation method thereof and application thereof in heavy metal ion detection.
The nano bismuth-polypyrrole composite electrode provided by the invention comprises an electrode substrate and an electrode modification layer, wherein the electrode substrate is made of one of ceramic, silicon substrate, PEI, PI and epoxy resin, and the electrode modification layer is a nano bismuth-polypyrrole modification layer, and specifically, nano metal bismuth particles are modified on a polypyrrole net structure.
The invention also aims to provide a preparation method of the nano bismuth-polypyrrole composite electrode.
The method specifically comprises the following steps:
s1, modifying polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method to obtain a polypyrrole electrode;
s2, taking the polypyrrole modification layer as a substrate, and modifying the nano metal bismuth on the surface of the polypyrrole modification layer in situ by adopting an electrodeposition method to obtain the nano bismuth-polypyrrole composite electrode.
At present, a lot of methods are used for detecting and analyzing metal elements by adopting bismuth membrane electrodes, but most methods are long in detection time, complicated in steps, large-scale detection instruments are required, and the methods are not suitable for rapid detection. The electrochemical detection method has the advantages of quick response, high sensitivity, simple preparation, convenience in carrying and the like, and is the best method for quickly and accurately detecting the metal elements at present. The invention adopts electrochemistry-stripping voltammetry to combine the preparation and the detection of the bismuth membrane electrode, thereby realizing the purpose of combining online monitoring and rapid detection.
Further, in step S1, the electrodeposition method specifically includes: and (2) placing the interdigital electrode into prepared polypyrrole solution, adopting a three-electrode system, applying a 0.3-0.8V potential by taking the interdigital electrode as a working electrode, Pt as a counter electrode and Ag/AgCl as a reference electrode, performing electrodeposition for 10-50 s, and then placing the interdigital electrode in deionized water for ultrasonic cleaning for 3-5 min.
The sodium dodecyl sulfate is used as a surfactant and an additive, and can increase the solubility of the pyrrole and improve the conductivity of the polypyrrole. Sodium lauryl sulfate may also be selected.
Further, the polypyrrole solution comprises the following components: 30-60 mmol/L pyrrole monomer, 0.1-0.5 mol/L Na2SO420-50 mmol/L sodium dodecyl sulfate.
Further, in step S2, the electrodeposition method specifically includes: and (3) taking the polypyrrole electrode as a working electrode, putting the polypyrrole electrode into 80-120 mg/L bismuth salt solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, applying a voltage of-1.0-1.5V, and performing electrodeposition for 6-10 min.
Further, the bismuth salt is bismuth nitrate or bismuth acetate.
Scanning and observing the surface appearance of the nano bismuth-polypyrrole composite electrode prepared by the invention by adopting an SEM electron microscope.
As shown in fig. 1, which is a surface topography of a nano bismuth-polypyrrole composite electrode prepared by the present invention, wherein fig. 1(a) is an SEM image of polypyrrole, and fig. 1(b) is an SEM image of the nano bismuth-polypyrrole composite electrode. As can be seen from the figure, the macromolecular copolymer network structure of polypyrrole can allow metal ions to pass through, but the suspended substances with larger volume are difficult to pass through. Nano metal bismuth particles are modified on a polypyrrole net structure, so that the electrode pair water pollutant Zn is greatly improved2+、Pb2+And Cd2+The detection sensitivity and stability of the ions.
The invention also aims to provide the application of the nano bismuth-polypyrrole composite electrode in heavy metal ion detection.
The nano bismuth-polypyrrole composite electrode can simultaneously detect Zn2+、Pb2+And Cd2+Ions.
The nano bismuth-polypyrrole composite electrode can be connected with an electrochemical workstation through a USB interface for use.
And (3) carrying out heavy metal element response performance test on the nano bismuth-polypyrrole composite electrode prepared by the invention by adopting a differential pulse voltammetry.
The detection method of the nano bismuth-polypyrrole composite electrode on the metal ions specifically comprises the following steps: zn is added into 0.1mol/L acetic acid-sodium acetate buffer solution (pH is 4.5) with proper concentration2+、Pb2+And Cd2+The composite electrode is a working electrode, platinum is a counter electrode, silver-silver chloride is a reference electrode, and a differential pulse stripping voltammetry is adopted for scanning to determine a change curve of peak current. After each measurement, the voltage is kept at-0.3 to-0.35V for 30s, so that the electrode is re-optimized, and the multiple recycling of the composite electrode can be realized.
As shown in attached figure 2, the nano bismuth-polypyrrole composite electrode prepared by the invention is used for detecting Pb2+The differential pulse anode of (1) stripping voltammogram in which Pb is present2+The concentration is 1-8 mug/L. It can be seen from the figure that with Pb2+Increasing concentration, peak powerThe flow density is gradually increased, which shows that the nano bismuth-polypyrrole composite electrode prepared by the invention has excellent response characteristics to trace lead ions.
As shown in attached figure 3, the nano bismuth-polypyrrole composite electrode prepared by the invention is used for detecting Cd2+The differential pulse anodic stripping voltammetry curve of (1), wherein Cd2+The concentration is 20-120 mg/L. As can be seen from the figure, with Cd2+The concentration is gradually increased, and the peak current is gradually increased, which shows that the nano bismuth-polypyrrole composite electrode prepared by the invention can be used for separately detecting cadmium ions.
As shown in attached figure 4, the nano bismuth-polypyrrole composite electrode prepared by the invention can simultaneously detect Pb2+And Cd2+The differential pulse anode of (1) stripping voltammogram in which Pb is present2+And Cd2+The concentration of the mixed liquid is 10-110 mu g/L, the scanning speed is set to be 50mV/s, and the scanning potential is set to be-1.1V-0.2V. As can be seen from the graph, when the mixed solution was tested, Pb appeared in the cyclic voltammogram2+And Cd2+Two different oxidation peaks with peak potentials around 0.55V and 0.78V, Pb2+And Cd2+The oxidation peak can be completely separated by the composite electrode, which shows that the nano bismuth-polypyrrole composite electrode prepared by the invention can simultaneously detect trace Pb2+And Cd2+。
As shown in attached figure 5, the nano bismuth-polypyrrole composite electrode prepared by the invention can simultaneously detect Zn2+、Pb2+And Cd2+The differential pulse anodic stripping voltammogram of (1), wherein Zn2+、Pb2+And Cd2+The concentration is 100-1000 mug/L, the scanning speed is set to be 50mV/s, and the scanning potential is-1.1V-0.2V. As can be seen from the figure, the cyclic voltammogram shows three distinct current peaks corresponding to Zn respectively2+、Pb2+And Cd2+The current peaks show that the three metal ions have good electrochemical response on the nano bismuth-polypyrrole composite electrode, and the oxidation peak potentials of zinc ions, lead ions and cadmium ions are different and do not interfere with the determination, so that the nano bismuth-polypyrrole composite electrode prepared by the invention can be used for simultaneously detecting the heavy metal element Zn2+、Pb2+And Cd2+The simultaneous determination of Zn is established2+、Pb2+And Cd2+The novel electrochemical method of (1).
The invention adopts an electrochemical in-situ modification method to modify a metal film layer on the surface of a polymer in situ, and compounds the polypyrrole with a net structure and the nano metal bismuth with catalytic activity, so that metal ions can pass through the composite material, and suspended substances with larger volume are difficult to pass through the composite material, thereby greatly improving the sensitivity of the electrode on the detection of the metal ions and reducing the detection limit. The composite structure of the copolymer and the metal on the surface of the electrode increases the stability of the electrode, so that the electrode can be recycled, and the problem of electrode sensitivity in trace metal pollutant detection is solved.
The invention has the beneficial effects that:
(1) the polypyrrole and the nano metal bismuth are compounded, so that the nano particles are uniformly distributed on the surface of the macromolecular copolymer network structure, the electrode sensitivity is greatly increased, the detection limit is reduced, and the stability of the electrode structure is increased. Can realize trace metal element Zn in complex environment2+、Pb2+And Cd2+While simultaneously detecting.
(2) The preparation process is simple, and the detection method is easy to operate. The special electrode structure can realize the real-time detection of a sampling site in a complex environment, does not need a complex processing procedure of a specimen in laboratory inspection, and greatly improves the detection efficiency.
(3) The invention combines electrochemistry-in-situ modification and stripping voltammetry, simultaneously carries out preparation and detection of the electrode, can realize the purpose of on-line detection, and is suitable for development of portable metal element sensing equipment.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a surface topography of a nano bismuth-polypyrrole composite electrode prepared by the invention, wherein (a) an SEM image of polypyrrole and (b) an SEM image of the nano bismuth-polypyrrole electrode are shown.
FIG. 2 shows a nano bismuth-polypyrrole composite electrode pair Pb prepared by the invention2+And (3) detecting the stripping voltammetry curve of the differential pulse anode.
FIG. 3 shows a nano bismuth-polypyrrole composite electrode pair Cd prepared by the invention2+And (3) detecting the stripping voltammetry curve of the differential pulse anode.
FIG. 4 shows that the nano bismuth-polypyrrole composite electrode prepared by the invention can simultaneously detect Pb2+And Cd2+The differential pulse anode of (3) dissolves the voltammogram.
FIG. 5 shows that the nano bismuth-polypyrrole composite electrode prepared by the invention can simultaneously detect Zn2+、Pb2+And Cd2+The differential pulse anode of (3) dissolves the voltammogram.
Detailed Description
In order that the objects, aspects and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the following detailed description and the accompanying drawings.
Example 1
Preparing a nano bismuth-polypyrrole composite electrode:
s1, preparing polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method. Preparing polypyrrole solution, wherein the composition of the solution is 50mM pyrrole monomer and 0.5M Na2SO430mM sodium dodecylsulfate. A three-electrode system is adopted, an interdigital electrode is used as a working electrode, Pt is used as a counter electrode, Ag/AgCl is used as a reference electrode, the applied potential is set to be 0.8V, the electrodeposition time is set to be 10s, a polypyrrole coating is obtained, and the prepared polypyrrole coating is ultrasonically cleaned in deionized water for 5min for later use.
S2, taking the prepared polypyrrole modified electrode as a substrate, modifying nano metal bismuth on the surface of polypyrrole by adopting an electrodeposition method, putting the polypyrrole electrode into 80mg/L bismuth nitrate solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, setting the applied voltage to be-1.5V and the electrodeposition time to be 6min, and continuously stirring to obtain the nano bismuth-polypyrrole composite electrode.
Example 2
Preparing a nano bismuth-polypyrrole composite electrode:
s1, preparing polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method. Preparing polypyrrole solution, wherein the composition of the solution is 50mM pyrrole monomer and 0.5M Na2SO430mM sodium dodecylsulfate. A three-electrode system is adopted, an interdigital electrode is used as a working electrode, Pt is used as a counter electrode, Ag/AgCl is used as a reference electrode, the applied potential is set to be 0.5V, the electrodeposition time is set to be 30s, a polypyrrole coating is obtained, and the prepared polypyrrole coating is ultrasonically cleaned in deionized water for 5min for later use.
S2, taking the prepared polypyrrole modified electrode as a substrate, modifying nano metal bismuth on the surface of polypyrrole by adopting an electrodeposition method, putting the polypyrrole electrode into a 60mg/L bismuth nitrate solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, setting the applied voltage to be-1.5V and the electrodeposition time to be 10min, and continuously stirring to obtain the nano bismuth-polypyrrole composite electrode.
Example 3
Preparing a nano bismuth-polypyrrole composite electrode:
s1, preparing polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method. Preparing polypyrrole solution, wherein the composition of the solution is 50mM pyrrole monomer and 0.5M Na2SO420mM sodium dodecylsulfate. A three-electrode system is adopted, an interdigital electrode is used as a working electrode, Pt is used as a counter electrode, Ag/AgCl is used as a reference electrode, the applied potential is set to be 0.3V, the electrodeposition time is set to be 50s, a polypyrrole coating is obtained, and the prepared polypyrrole coating is ultrasonically cleaned in deionized water for 5min for later use.
S2, taking the prepared polypyrrole modified electrode as a substrate, modifying nano metal bismuth on the surface of polypyrrole by adopting an electrodeposition method, putting the polypyrrole electrode into a 100mg/L bismuth nitrate solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, setting the applied voltage to be-1.0V and the electrodeposition time to be 10min, and continuously stirring to obtain the nano bismuth-polypyrrole composite electrode.
Example 4
Preparing a nano bismuth-polypyrrole composite electrode:
s1, preparing polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method. Preparing polypyrrole solution, wherein the composition of the solution is 50mM pyrrole monomer and 0.5M Na2SO430mM sodium dodecylsulfate. A three-electrode system is adopted, an interdigital electrode is used as a working electrode, Pt is used as a counter electrode, Ag/AgCl is used as a reference electrode, the applied potential is set to be 0.8V, the electrodeposition time is set to be 10s, a polypyrrole coating is obtained, and the prepared polypyrrole coating is ultrasonically cleaned in deionized water for 5min for later use.
S2, taking the prepared polypyrrole modified electrode as a substrate, modifying nano metal bismuth on the surface of polypyrrole by adopting an electrodeposition method, putting the polypyrrole electrode into 80mg/L bismuth acetate solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, setting the applied voltage to be-1.5V and the electrodeposition time to be 6min, and continuously stirring to obtain the nano bismuth-polypyrrole composite electrode.
Example 5
Preparing a nano bismuth-polypyrrole composite electrode:
s1, preparing polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method. Preparing polypyrrole solution, wherein the composition of the solution is 50mM pyrrole monomer and 0.5M Na2SO430mM sodium dodecylsulfate. A three-electrode system is adopted, an interdigital electrode is used as a working electrode, Pt is used as a counter electrode, Ag/AgCl is used as a reference electrode, the applied potential is set to be 0.5V, the electrodeposition time is set to be 30s, a polypyrrole coating is obtained, and the prepared polypyrrole coating is ultrasonically cleaned in deionized water for 5min for later use.
S2, taking the prepared polypyrrole modified electrode as a substrate, modifying nano metal bismuth on the surface of polypyrrole by adopting an electrodeposition method, putting the polypyrrole electrode into a 120mg/L bismuth acetate solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, setting the applied voltage to be-1.0V and the electrodeposition time to be 8min, and continuously stirring to obtain the nano bismuth-polypyrrole composite electrode.
Example 6
Detection of heavy metal ions Pb by nano bismuth-polypyrrole composite electrode2+：
The nano bismuth-polypyrrole composite electrode prepared in example 1 was placed in a 0.1Adding Pb gradually into mol/L acetic acid-sodium acetate buffer solution (pH is 4.5)2+The solution is scanned by differential pulse stripping voltammetry with the composite electrode as the working electrode, platinum as the counter electrode and silver-silver chloride as the reference electrode, and the change curve of the peak current is determined, thus obtaining the attached figure 2.
FIG. 2 shows Pb2+When the concentration is 1-8 mu g/L, the peak current density follows Pb2+The concentration is increased, so that the nano bismuth-polypyrrole composite electrode prepared in example 1 has excellent response characteristics to trace lead ions, and can be used for individual detection of trace lead ions.
Example 7
Detection of heavy metal ions Cd by nano bismuth-polypyrrole composite electrode2+：
The nano bismuth-polypyrrole composite electrode prepared in example 1 was put into 0.1mol/L acetic acid-sodium acetate buffer solution (pH 4.5), and Cd was gradually added2+The solution is scanned by differential pulse anodic stripping voltammetry with the composite electrode as the working electrode, platinum as the counter electrode and silver-silver chloride as the reference electrode, and the change curve of the peak current is determined, thus obtaining the attached figure 3.
FIG. 3 shows Cd2+When the concentration is 20-120 mg/L, the peak current density is along with Cd2+The concentration is increased, so that the nano bismuth-polypyrrole composite electrode prepared in example 1 has excellent response characteristics to cadmium ions, and can be used for separately detecting the cadmium ions.
Example 8
Nano bismuth-polypyrrole composite electrode for simultaneously detecting heavy metal ions Pb2+And Cd2+：
The nano bismuth-polypyrrole composite electrode prepared in example 1 was put into 0.1mol/L acetic acid-sodium acetate buffer solution (pH 4.5), and Pb was gradually added2+And Cd2+The mixed solution of (1) is scanned by using a differential pulse anodic stripping voltammetry with a composite electrode as a working electrode, platinum as a counter electrode and silver-silver chloride as a reference electrode, and a change curve of peak current of the mixed solution is measured to obtain the attached figure 4.
FIG. 4 shows Pb2+And Cd2+When the concentration range of the mixed solution is 10-110 mu g/L, the peak current density is increased along with the increase of the concentration of the mixed solution, and two completely different oxidation peaks appear, which respectively correspond to Pb2+And Cd2+Two heavy metal elements, so that the nano bismuth-polypyrrole composite electrode prepared in example 1 can simultaneously detect trace lead ions and cadmium ions.
Example 9
Nano bismuth-polypyrrole composite electrode for simultaneously detecting heavy metal ions Zn2+、Pb2+And Cd2+：
The nano bismuth-polypyrrole composite electrode prepared in example 1 was put into 0.1mol/L acetic acid-sodium acetate buffer solution (pH 4.5), and Zn was gradually added2+、Pb2+And Cd2+The mixed solution of (1) is scanned by using a differential pulse anodic stripping voltammetry with a composite electrode as a working electrode, platinum as a counter electrode and silver-silver chloride as a reference electrode, and a change curve of peak current of the mixed solution is measured to obtain the attached figure 5. FIG. 5 shows Zn2+、Pb2+And Cd2+When the concentration range of the mixed solution is 100-1000 mug/L, the peak current density is increased along with the increase of the concentration of the mixed solution, and three completely different oxidation peaks appear, which respectively correspond to Zn2+、Pb2+And Cd2+Three heavy metal elements are not interfered with each other, so that the nano bismuth-polypyrrole composite electrode prepared in example 1 can simultaneously detect zinc ions, lead ions and cadmium ions of the heavy metal elements.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be combined appropriately to form other embodiments that those skilled in the art can understand. The technical details not described in detail in the present invention can be implemented by any of the prior arts in the field. In particular, all technical features of the invention which are not described in detail can be achieved by any prior art.
Claims (8)
1. The nano bismuth-polypyrrole composite electrode is characterized by comprising an electrode substrate and an electrode modification layer, wherein the electrode substrate is made of one of ceramic, silicon substrate, PEI, PI and epoxy resin, and the electrode modification layer is a nano bismuth-polypyrrole modification layer, and specifically nano metal bismuth particles are modified on a polypyrrole net structure.
2. The preparation method of the nano bismuth-polypyrrole composite electrode according to claim 1, characterized by comprising the following steps:
s1, modifying polypyrrole on the surface of the interdigital electrode by adopting an electrodeposition method to obtain a polypyrrole electrode;
s2, taking the polypyrrole modification layer as a substrate, and modifying the nano metal bismuth on the surface of the polypyrrole modification layer in situ by adopting an electrodeposition method to obtain the nano bismuth-polypyrrole composite electrode.
3. The method for preparing a nano bismuth-polypyrrole composite electrode according to claim 2, wherein in the step S1, the electrodeposition method specifically comprises: and (2) placing the interdigital electrode into prepared polypyrrole solution, adopting a three-electrode system, applying a 0.3-0.8V potential by taking the interdigital electrode as a working electrode, Pt as a counter electrode and Ag/AgCl as a reference electrode, performing electrodeposition for 10-50 s, and then placing the interdigital electrode in deionized water for ultrasonic cleaning for 3-5 min.
4. The nano bismuth-polypyrrole composite electricity of claim 3The preparation method of the electrode is characterized in that the polypyrrole solution comprises the following components: 30-60 mmol/L pyrrole monomer, 0.1-0.5 mol/L Na2SO420-50 mmol/L sodium dodecyl sulfate.
5. The method for preparing a nano bismuth-polypyrrole composite electrode according to claim 2, wherein in the step S2, the electrodeposition method specifically comprises: and (3) taking the polypyrrole electrode as a working electrode, putting the polypyrrole electrode into 80-120 mg/L bismuth salt solution, taking Pt as a counter electrode and Ag/AgCl as a reference electrode, applying a voltage of-1.0-1.5V, and performing electrodeposition for 6-10 min.
6. The method for preparing a nano bismuth-polypyrrole composite electrode according to claim 5, wherein the bismuth salt is bismuth nitrate or bismuth acetate.
7. The application of the nano bismuth-polypyrrole composite electrode of claim 1 in heavy metal ion detection.
8. The application of the nano bismuth-polypyrrole composite electrode in heavy metal ion detection according to claim 7, wherein the nano bismuth-polypyrrole composite electrode can detect Zn simultaneously2+、Pb2+And Cd2+Ions.
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| CN113702477A (en) * | 2021-04-30 | 2021-11-26 | 广州钰芯智能科技研究院有限公司 | Gold film modified electrode for heavy metal detection and preparation method thereof |
| CN113702456A (en) * | 2021-04-30 | 2021-11-26 | 广州钰芯智能科技研究院有限公司 | Bismuth film modified electrode for heavy metal detection and preparation method thereof |
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| CN113702456A (en) * | 2021-04-30 | 2021-11-26 | 广州钰芯智能科技研究院有限公司 | Bismuth film modified electrode for heavy metal detection and preparation method thereof |
| CN113702456B (en) * | 2021-04-30 | 2024-03-26 | 广州钰芯智能科技研究院有限公司 | Bismuth film modified electrode for heavy metal detection and preparation method thereof |
| CN113418974A (en) * | 2021-05-31 | 2021-09-21 | 惠州市钰芯电子材料有限公司 | Rare earth oxide-polypyrrole composite electrode capable of detecting blood sugar and preparation method thereof |
| CN113607799A (en) * | 2021-06-30 | 2021-11-05 | 广州钰芯传感科技有限公司 | Manganese dioxide-polypyrrole composite electrode, preparation method thereof and application thereof in heavy metal detection |
| CN114002285A (en) * | 2021-10-19 | 2022-02-01 | 广州钰芯智能科技研究院有限公司 | Polyaniline-nano bismuth composite electrode for heavy metal detection and preparation method thereof |
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