Electrochemical sensor and potassium ion detection method thereof

A kind of electrochemical and sensor technology, applied in the field of analysis and detection, can solve the problems of low detection limit and lack of research, and achieve the effect of reducing the detection limit, broad application prospects, and broadening the detection range

Inactive Publication Date: 2019-08-20
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the research on the response of different crown ether electrodes to metal ions is still relatively lacking. Therefore, it...

Method used

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  • Electrochemical sensor and potassium ion detection method thereof
  • Electrochemical sensor and potassium ion detection method thereof
  • Electrochemical sensor and potassium ion detection method thereof

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Effect test

Embodiment 1

[0031] 1. Preparation of crown ether functionalized graphene oxide (Crown-GO) suspension

[0032] The preparation process of the crown ether functionalized graphene oxide composite (Crown-GO) was as follows: 10 mL graphene oxide solution (6 mg mL -1 ) was diluted to 30 mL, followed by ultrasonic oscillation in an ice-water bath to produce a clear and uniform yellow-brown dispersion, and then 60 mg of 1-aza-18 crown-6 ether and 0.8 mL of tetrabutylammonium hydroxide solution were added to the graphene oxide solution , the mixture was heated to 85°C under magnetic stirring, kept at room temperature for 10 h. Finally, the sample was centrifuged and washed with a large amount of ultrapure water to obtain a crown ether functionalized graphene oxide composite material.

[0033] 2. Electrode Preparation

[0034] Use 0.3μm and 0.05μm Al in sequence 2 o 3 A glassy carbon electrode with a diameter of 3 mm was polished into a mirror surface, and the polished glassy carbon electrode w...

Embodiment 2

[0041] A glassy carbon electrode modified with 1-aza-18-crown-6 ether was used as the working electrode, a saturated calomel electrode was used as the reference electrode, and a platinum electrode was used as the counter electrode. In 1.5mM methylene blue solution, the frequency range was 10 6 Hz-0.01Hz, the amplitude is 5mV, the initial voltage is the open circuit voltage, and the resting time is 30s, the electrochemical impedance method is used to detect different concentrations of potassium ions. The concentration of potassium ions is 10 -15 -10 -4 Mol / L. The preparation method of the 1-aza-18 crown-6 ether modified glassy carbon electrode is the same as the preparation method of the 1-aza-18 crown-6 ether functionalized graphene oxide modified glassy carbon electrode.

Embodiment 3

[0043] A glassy carbon electrode modified with 4-aminobenzo-18-crown-6 ether functionalized graphene oxide was used as the working electrode, a saturated calomel electrode was used as the reference electrode, and a platinum electrode was used as the counter electrode. , the frequency range is 10 6 Hz-0.01Hz, the amplitude is 5mV, the initial voltage is the open circuit voltage, and the resting time is 30s, the electrochemical impedance method is used to detect different concentrations of potassium ions. The concentration of potassium ions is 10 -15 -10 -4 Mol / L. Wherein the preparation method of 4-aminobenzo-18-crown-6 ether functionalized graphene oxide modified glassy carbon electrode and the preparation method of 1-aza-18-crown-6 ether functionalized graphene oxide modified glassy carbon electrode same.

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Abstract

The invention discloses an electrochemical sensor and a potassium ion detection method thereof, and belongs to the field of analysis and detection. A preparation method for a work electrode of the electrochemical sensor comprises that 1-aza-18-crown-6 functionalized oxidized graphene (Crown-GO) is dispersed in an aqueous solution by supersonics to obtain a Crown-GO suspension; and the Crown-GO suspension is uniformly dropped on the surface of a glassy carbon electrode after polishing, cleaning and blowing-dry to obtain Crown-GO/GCE. It is shown, by electrochemical performance test, the prepared glassy carbon electrode modified by the Crown-GO composite material can be used to detect potassium ions highly sensitively with low detection limit and wide detection range; and the prepared electrochemical sensor has the advantages of being simple in the electrode material preparation process, friendly to the environment, simple in operation and high in sensitivity, and can be widely applied in the potassium ion detection field.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and relates to an electrochemical sensor and a method for detecting potassium ions. Background technique [0002] Potassium ions, as the main cation of intracellular fluid, play an important role in human biological systems, especially in regulating blood pressure and maintaining muscle strength. However, excessive or small amounts of potassium ions can lead to many diseases, such as kidney disease, anorexia, heart disease, diabetes and Addison's disease. Therefore, it is of great significance to explore a simple, rapid, highly sensitive, highly selective, and low-cost potassium ion detection method. At present, there are many methods for detecting potassium ions, such as fluorescent sensors, atomic absorption spectrophotometry and so on. However, most of the methods use very complex equipment and cumbersome experimental procedures, thus limiting their practical application. Moreover, som...

Claims

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Application Information

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IPC IPC(8): G01N27/416
CPCG01N27/416
Inventor 章海霞智翠梅吴玉程郭俊杰侯莹闫晓丽张华
Owner TAIYUAN UNIV OF TECH
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