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Electrochemical sensor for detecting lead ion and/or cadmium ion, and preparation method and application thereof

An electrochemical and lead ion technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of cumbersome preparation process, inability to detect two or more substances at the same time, and low detection sensitivity, so as to reduce the preparation steps , Improving the performance of electrochemical analysis and improving the effect of chemical properties

Active Publication Date: 2018-06-29
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the traditional detection technologies can only detect a certain substance at the same time, but cannot detect two or more substances at the same time, mainly because the substances modified on the surface of the sensor can only generate specific signals for specific molecules.
In addition, the preparation process of existing electrochemical sensors for detecting heavy metal ions is cumbersome and the detection sensitivity is low.

Method used

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  • Electrochemical sensor for detecting lead ion and/or cadmium ion, and preparation method and application thereof
  • Electrochemical sensor for detecting lead ion and/or cadmium ion, and preparation method and application thereof
  • Electrochemical sensor for detecting lead ion and/or cadmium ion, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] An electrochemical sensor for detecting lead ions and / or cadmium ions, comprising a glassy carbon electrode used as a working electrode in a three-electrode system, wherein the surface of the reaction end of the glassy carbon electrode is decorated with an ordered medium loaded with hollow spherical bismuth oxide Porous carbon, ordered mesoporous carbon loaded with hollow spherical bismuth oxide is based on ordered mesoporous carbon, and the surface of ordered mesoporous carbon is loaded with hollow spherical bismuth oxide.

[0048] In this embodiment, bismuth oxide is supported on the surface of the ordered mesoporous carbon by a hydrothermal method, and a hollow spherical bismuth oxide is formed on the surface of the ordered mesoporous carbon by high-temperature calcination.

[0049] In this embodiment, the mass ratio of the ordered mesoporous carbon to the hollow spherical bismuth oxide in the ordered mesoporous carbon loaded with hollow spherical bismuth oxide is 1:1...

Embodiment 2

[0075] An application of an electrochemical sensor in simultaneously detecting lead ions and cadmium ions, comprising the following steps:

[0076] (1) With the glassy carbon electrode modified with ordered mesoporous carbon loaded with hollow spherical bismuth oxide on the surface of the reaction end in Example 1 as the working electrode, the saturated calomel electrode as the reference electrode, and the platinum electrode as the counter electrode, three electrodes are established system, connect the three-electrode system to the electrochemical workstation, and add different concentrations of lead-cadmium ion solutions (lead-cadmium ion concentrations are 0.50nM, 1.0nM, 2.0nM, 4.0nM, 6.0nM, 8.0nM, 10.0nM, 20.0nM, 40.0nM, 60.0nM, 80.0nM, 100.0nM, 120.0nM, 140.0nM, 160.0nM, 180.0nM, 200.0nM), test differential pulse for different concentrations of lead and cadmium ion solutions Voltammetric spectrum (DPV).

[0077] (2) Construct a linear regression equation according to the ...

Embodiment 3

[0087] Investigate the detection accuracy of electrochemical sensors

[0088] In order to further verify the detection effect of the electrochemical sensor in practical application in Example 1, the electrochemical sensor is now used for target detection in actual samples by standard addition method or direct dilution method (assay method with reference to Example 2), Perform recovery experiments.

[0089] (1) Using the electrochemical sensor in Example 1 to detect Pb in leaded slag and polluted soil respectively 2+ and Cd 2+ The specific steps are as follows: the two samples of lead-containing slag and contaminated soil are processed by the automatic graphite heating digestion method, the obtained digestion solution is allowed to stand, and the supernatant is taken to adjust the pH to 4.5 with acetate buffer. Sample (contains Pb 2+ and Cd 2+ ) with reference to Table 1 for the concentration of the target substance, and finally the electrochemical sensor of Example 1 is de...

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Abstract

The invention discloses an electrochemical sensor for detecting lead ions and / or cadmium ions, and a preparation method and an application thereof. The electrochemical sensor includes a glassy carbonelectrode, of which the surface of a reaction terminal is modified by ordered mesoporous carbon supporting hollow spherical bismuth oxide, which is formed with the ordered mesoporous carbon as a carrier, of which the surface supports the hollow spherical bismuth oxide. The preparation method includes a step of modifying the ordered mesoporous carbon supporting hollow spherical bismuth oxide onto the surface of the reaction terminal of the glassy carbon electrode. The electrochemical sensor has advantages of good stability, long service life, wide detection range, low detection limit, good selectivity and strong anti-interference capability. The preparation method has simple processes, low cost and convenient operations, is pollution-free and has extensive application range. The electrochemical sensor is used for detecting lead ions and / or cadmium ions, has simple operation, low cost, short responsive time and high sensitivity, and has great application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, and relates to an electrochemical sensor for detecting lead ions and / or cadmium ions, a preparation method and application thereof. Background technique [0002] Heavy metal pollutants have mutagenic, carcinogenic and teratogenic effects, and mainly invade the human body through the respiratory and digestive tracts, seriously endangering human health and the ecological environment. Of which lead ions (Pb 2+ ) and cadmium ions (Cd 2+ ) as its most common and stable form of existence, widely exists in waste residues and wastewater in agricultural production, mineral engineering, electrolytic plating and other fields. The World Health Organization (WHO) stipulates that the total content of lead ions in drinking water should not exceed 0.005 mg / L, and the total content of cadmium ions should not exceed 0.001 mg / L. Therefore, it is extremely necessary to obtain an electrochemical se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 汤琳方思源曾光明彭博余江芳冯程洋欧阳细莲
Owner HUNAN UNIV
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