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Method for simultaneously detecting cadmium and lead ions by employing sulfhydrylated peroxidized poly(m-phenylenediamine) modified bismuth membrane electrode

A technology of peroxidizing poly-m-phenylenediamine and poly-m-phenylenediamine is applied in the direction of electrochemical variables of materials, which can solve the problems of decreased conductivity of conductive polymers, time-consuming operation, de-doping, etc., and achieves improved electrostatic attraction. , Increase the detection ability, the effect of simple operation

Active Publication Date: 2015-04-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of thiolated conductive polymers requires two steps: the synthesis of conductive polymers and the mercaptolation, and the operation is time-consuming and complicated.
At the same time, after the peroxidation of the conductive polymer, some oxygen-containing groups, such as carboxyl, carbonyl, etc., will be introduced. Usually, this process will cause the conductivity of the conductive polymer to decrease and dedoping

Method used

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  • Method for simultaneously detecting cadmium and lead ions by employing sulfhydrylated peroxidized poly(m-phenylenediamine) modified bismuth membrane electrode
  • Method for simultaneously detecting cadmium and lead ions by employing sulfhydrylated peroxidized poly(m-phenylenediamine) modified bismuth membrane electrode
  • Method for simultaneously detecting cadmium and lead ions by employing sulfhydrylated peroxidized poly(m-phenylenediamine) modified bismuth membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a, the preparation contains 0.1M H 2 SO 4 , 0.1M m-phenylenediamine and different concentrations of mercaptosuccinic acid electrolyte solution, using cyclic voltammetry, the potential range is -0.2 ~ 1.2V, and the scan rate is 50mV / s, it is modified on the surface of the glassy carbon electrode, one step The mercapto-polym-phenylenediamine modified electrode was obtained by the method.

[0029] b. The electrode prepared in step a was peroxidized in a 0.2M sodium hydroxide solution at a constant potential of 1.0V for 8 minutes to obtain a peroxidized mercapto-poly-m-phenylenediamine modified electrode.

[0030] c. In the oxygen-filled state, place the modified electrode in step b in the Bi-containing 3+ , Pb 2+ and Cd 2+ The bismuth film was deposited in situ in the NaAc-HAc buffer solution, and a bismuth film electrode modified with thiolated and peroxidized poly-m-phenylenediamine was obtained.

[0031] In order to investigate the impact of the concentration of me...

Embodiment 2

[0033] Firstly, a bismuth film electrode modified with thiolated and peroxidized poly-m-phenylenediamine was prepared, and the preparation process was the same as in Example 1.

[0034] In order to investigate the influence of the in-situ deposition potential on the detection of cadmium and lead ions in step c, the deposition potentials of -0.9V, -1.0V, -1.1V, -1.2V and -1.3V were respectively used to detect cadmium and lead ions. test, see the results figure 2 , it can be seen that at -1.0V, it has higher sensitivity and relatively flat background current. Although the peak currents detected at -1.1V, -1.2V, and -1.3V are higher than -1.0V, the background current is also lower due to hydrogen evolution. increased, so the in situ deposition potential was chosen to be -1.0 V.

Embodiment 3

[0036] Firstly, a bismuth film electrode modified with thiolated and peroxidized poly-m-phenylenediamine was prepared, and the preparation process was the same as in Example 1.

[0037] In order to investigate the influence of the in-situ deposition time in step c on the detection of cadmium and lead ions, therefore, the deposition times of 15s, 30s, 60s, 90s, 120s, 150s, and 180s were respectively used to detect cadmium and lead ions. The results are shown in image 3 , it can be seen that after 150s, the lead and cadmium ions deposited on the surface of the electrode are close to saturation, and a higher detection result is achieved.

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Abstract

The invention relates to a method for simultaneously detecting cadmium and lead ions by employing a sulfhydrylated peroxidized poly(m-phenylenediamine) modified bismuth membrane electrode. The method comprises the following steps: preparing a sulfhydrylated poly(m-phenylenediamine) modified electrode by employing a one-step process, preparing a peroxidized sulfhydrylated poly(m-phenylenediamine) modified electrode, and simultaneously detecting cadmium and lead ions. The beneficial effects comprise that by using the one-step process for preparing the sulfhydrylated poly(m-phenylenediamine) modified electrode, operation is simple, time is saved and labor is saved; and the bismuth membrane deposited on the surface of a peroxidized conductive polymer is relatively uniform and smooth, also the electrostatic attraction between the bismuth membrane and heavy metals is improved, and thus the heavy metal detection capability is improved.

Description

technical field [0001] The invention belongs to the field of electrochemical sensors and heavy metal detection, and relates to a method for simultaneously detecting cadmium and lead ions by using thiol and peroxidized polym-phenylenediamine to modify bismuth film electrodes. Background technique [0002] At present, with the rapid development of industrialization, a large amount of industrial waste liquid containing various heavy metals is discharged into water bodies, seriously affecting the health and survival of human beings and other organisms. The highly toxic heavy metals lead and cadmium are important pollutants of environmental water quality. They enter the environmental water body through the discharge of lead and cadmium-containing wastewater from electroplating, plasticizers, pigments, battery production, and alloys. The characteristics of lead and cadmium that exist for a long time and are not biodegradable make them pose a great threat to the environment, and as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 孔泳顾晓刚黎珊李伟陶永新魏永张炜
Owner CHANGZHOU UNIV
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