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Electrochemical sensor applied to large-concentration-range copper ion detection

A technology for copper ion detection and concentration range, which is applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems that electrochemical sensors cannot cover high concentration range copper ion detection, complex use of instruments, time-consuming and labor-intensive, etc., to achieve Good market prospect, controllable pore size and simple process

Active Publication Date: 2021-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an electrochemical sensor applied to the detection of copper ions in a large concentration range to solve the problems of traditional copper ion detection technology such as tedious operation, time-consuming and labor-consuming, and complex use of instruments, and at the same time solve the problems that the existing electrochemical sensors cannot cover Limitations of Copper Ion Detection in High Concentration Range

Method used

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  • Electrochemical sensor applied to large-concentration-range copper ion detection
  • Electrochemical sensor applied to large-concentration-range copper ion detection
  • Electrochemical sensor applied to large-concentration-range copper ion detection

Examples

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Effect test

Embodiment 1

[0040] (1) Preparation of working electrode

[0041] The calcium carbonate is mixed with the conductive carbon paste, the particle size of the calcium carbonate is 100nm, and the mass percentage in the mixture is 30%. The mixture of conductive carbon paste and calcium carbonate was printed on the working electrode area on the surface of the base material by screen printing process, then soaked in 1M hydrochloric acid for 100 minutes, then cleaned by ultrasonic (power 60W) vibration for 30 minutes, and dried to make a porous screen Printed carbon electrodes;

[0042] Next, dissolve carboxylated single-walled carbon nanotubes in 1M sulfuric acid at a concentration of 0.5 mg / L. After ultrasonic dispersion, 100 μL is dropped onto the surface of a porous screen-printed carbon electrode, and cyclic voltammetry is used to scan 10 cycles to scan the potential. The range falls in the -1.2-1.2V interval. The electron microscope picture of the working electrode is as follows figure 1 ...

Embodiment 2

[0056] (1) Preparation of working electrode

[0057] Calcium carbonate with a particle diameter of 80nm is mixed with the conductive carbon paste, and the mass percentage of calcium carbonate in the mixture is 45%. Print the mixture of conductive carbon paste and nano-calcium carbonate onto the working electrode area on the surface of the base material by screen printing technology, then soak it in hydrochloric acid for 120 minutes, then wash it with ultrasonic waves (power 50W) for 60 minutes, and make a porous screen after drying. Printed carbon electrodes;

[0058] Then carboxylated single-walled carbon nanotubes were dissolved in 0.5M sulfuric acid at a concentration of 1 mg / L. After ultrasonic dispersion, 80 μL was added dropwise to the surface of a porous screen-printed carbon electrode. The three-electrode system (the above-mentioned working electrode, reference electrode Ag / AgCl; the counter electrode is a carbon electrode) was deposited by the constant potential meth...

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Abstract

The invention discloses an electrochemical sensor applied to large-concentration-range copper ion detection, and belongs to the technical field of electrochemical sensors. A working electrode of the electrochemical sensor is a porous screen-printed carbon electrode; the surface of the porous screen-printed carbon electrode is modified with single-walled carbon nanotubes, the porosity of the porous screen-printed carbon electrode is 20-60%, and the aperture of the porous screen-printed carbon electrode is 100-3000 nm. The porous structure of the working electrode of the sensor provided by the invention improves the loading capacity of copper ions, so that the sensor can detect high-concentration copper ions, the linear detection range of the sensor ranges from 0.1-150ppm, and meanwhile, the sensitivity of the sensor is improved by the single-walled carbon nanotubes with excellent electron transfer capability. The sensor is small, portable, low in cost and suitable for on-site rapid detection of high-concentration copper ions in environmental water bodies, drinking water and agricultural products.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an electrochemical sensor applied to the detection of copper ions in a large concentration range. Background technique [0002] Copper is an essential element for most plants and animals on earth and plays an important role in the growth of living things. Since the biological toxicity of copper is much lower than that of heavy metals such as mercury, lead, cadmium, and chromium, the maximum allowable content of copper is much higher than that of other heavy metals. However, copper may also have harmful heavy metal toxicity effects on ecosystems and humans through long-term bioaccumulation. Excessive intake of copper ions can be highly toxic to the human body, leading to various health problems such as gastrointestinal discomfort, liver and kidney damage, high blood pressure and respiratory rate, and severe neurodegenerative diseases. [0003] At present, the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30C25D7/00C25D15/00
CPCG01N27/48G01N27/308C25D7/00C25D15/00
Inventor 郭希山程夏张京郑音飞
Owner ZHEJIANG UNIV