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Preparation and analysis method of an electrochemical sensor for detecting heavy metal ions

A heavy metal ion, electrochemical technology, applied in the direction of material electrochemical variables, material analysis through electromagnetic means, scientific instruments, etc., can solve the problems of poor electrical conductivity and limited applications, and achieve high porosity, large specific surface area, good The effect of conductivity

Active Publication Date: 2020-07-10
DAFENG YUELONG CHEM
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Problems solved by technology

As a novel class of crystalline materials, metal-organic frameworks (MOFs) have very high specific surface area and porosity, but their poor electrical conductivity limits their application in electrochemical sensing.

Method used

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  • Preparation and analysis method of an electrochemical sensor for detecting heavy metal ions
  • Preparation and analysis method of an electrochemical sensor for detecting heavy metal ions
  • Preparation and analysis method of an electrochemical sensor for detecting heavy metal ions

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Embodiment Construction

[0019] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0020] Carboxyl functionalization of MWCNTs

[0021] The multi-walled carbon nanotubes were fully stirred and reacted with concentrated nitric acid at 60°C for 12 hours, then centrifugally washed with deionized water until the pH value was neutral or weakly acidic, and the resulting product was dried in an oven at 110°C to obtain carboxyl-functionalized multi-walled carbon nanotubes. carbon nanotubes.

[0022] MWCNTs@UiO-66-NH 2 Preparation of composite materials

[0023] Weigh 0.2332g of zirconium chloride, 0.1812g of 2-aminoterephthalic acid and 0.11g of carboxylated multi-walled carbon nanotubes, dissolve them in 50mL of N,N-dimethylformamide and place them in an ultrasonic instrument for 30 Minutes to disperse evenly into a solution. The solution was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel reactor and reacted a...

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Abstract

The invention provides a preparation method of an electrochemical sensor for detecting heavy metal ions. The preparation method includes the following steps: 1) performing carboxyl functionalization to multi-wall carbon nano-tubes and performing in-situ synthesis with zirconium chloride and 2-aminoterephthalatic acid to prepare an MWCNTs@UiO-66-NH2 composite material; 2) dispersing the MWCNTs@UiO-66-NH2 composite material in N,N-dimethylformamide to prepare a suspension liquid, drop-coating a surface of a glass carbon electrode with the suspension liquid until the surface of the glass carbon electrode is completely covered thereby, and drying the glass carbon electrode in a drying device at room temperature to prepare the MWCNTs@UiO-66-NH2 composite material electrochemical sensor. The electrochemical sensor can achieve ultrasensitive detection on a sample. By an analysis method in the invention, an accurate analytic result can be acquired.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, and more specifically relates to a preparation method of an electrochemical sensor for detecting heavy metal ions. Background technique [0002] At present, heavy metal ion detection methods include atomic absorption spectrometry, atomic fluorescence method, ultraviolet-visible spectrophotometry, inductively coupled plasma mass spectrometry and so on. At present, the sample pretreatment process of these detection methods is cumbersome, the operation is complicated, and the instrument cost is high. Electrochemical analysis has become a very competitive on-site detection method due to its high sensitivity, good specificity, small sample consumption, simplicity and speed. As a novel class of crystalline materials, metal-organic frameworks (MOFs) have very high specific surface area and porosity, but their poor electrical conductivity limits their application in electrochemical sensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/36G01N27/48
CPCG01N27/308G01N27/36G01N27/48
Inventor 王璐
Owner DAFENG YUELONG CHEM
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