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Preparation method of electrochemical sensor for detecting lead ions based on rapid scanning cyclic voltammetry technology and application thereof

A cyclic voltammetry and fast scanning technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., to achieve the effect of convenient operation, high sensitivity, and fast detection speed

Active Publication Date: 2020-06-19
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no reports on the one-step preparation of carbon nanotube-based electrochemical sensors and the detection of lead ions by fast scanning cyclic voltammetry.

Method used

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  • Preparation method of electrochemical sensor for detecting lead ions based on rapid scanning cyclic voltammetry technology and application thereof
  • Preparation method of electrochemical sensor for detecting lead ions based on rapid scanning cyclic voltammetry technology and application thereof
  • Preparation method of electrochemical sensor for detecting lead ions based on rapid scanning cyclic voltammetry technology and application thereof

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Effect test

Embodiment 1

[0038] A method for preparing an electrochemical sensor based on fast scanning cyclic voltammetry to detect lead ions, comprising the following steps:

[0039] (1) Synthesis of magnetic functional materials (NH 2 -MWCNTs@Fe 3 o 4 )

[0040] a. NH 2 - Preparation of MWCNTs

[0041] Add 400 mg of multi-walled carbon nanotubes to 80 mL of a mixed solution of concentrated nitric acid and concentrated sulfuric acid at a volume ratio of 1:3, ultrasonically disperse for 2 to 2.5 hours, and condense at a temperature of 35 to 45 °C Reflux for oxidation reaction, after the oxidation reaction is completed (the multi-walled carbon nanotubes after oxidation treatment are characterized by SEM, it is found that the length of carbon nanotubes is shorter than that of the original carbon nanotubes, and more ports appear, effectively removing Impurities in MWCNTs), washed by centrifugation until neutral, and vacuum dried overnight at 50 °C to obtain carboxylated carbon nanotubes (COOH-MWCNT...

Embodiment 2

[0051] A method for preparing an electrochemical sensor based on fast scanning cyclic voltammetry to detect lead ions, comprising the following steps:

[0052] (1) Synthesis of magnetic functional materials (NH 2 -MWCNTs@Fe 3 o 4 )

[0053] a. NH 2 - Preparation of MWCNTs

[0054] Add 300 mg of multi-walled carbon nanotubes to 90 mL of a mixed solution of concentrated nitric acid and concentrated sulfuric acid at a ratio of 1:3 by volume, ultrasonically disperse for 2 hours, and condense and reflux at a temperature of 35 °C for oxidation reaction , after the oxidation reaction was completed, it was centrifuged and washed with water until neutral, and dried in vacuum at 45°C overnight to obtain carboxylated carbon nanotubes (COOH-MWCNTs); then 300 mg of carboxylated carbon nanotubes were added to 60 mL of thionyl chloride ( SOCl 2) and 3 mL of dimethylformamide (DMF), stirred at 60°C for 22 hours, centrifuged and washed 5 times with anhydrous tetrahydrofuran (THF), dried,...

Embodiment 3

[0064] A method for preparing an electrochemical sensor based on fast scanning cyclic voltammetry to detect lead ions, comprising the following steps:

[0065] (1) Synthesis of magnetic functional materials (NH 2 -MWCNTs@Fe 3 o 4 )

[0066] a. NH 2 - Preparation of MWCNTs

[0067] Add 500 mg of multi-walled carbon nanotubes to 70 mL of a mixed solution of concentrated nitric acid and concentrated sulfuric acid at a volume ratio of 1:3, ultrasonically disperse for 2.5 hours, and condense and reflux at a temperature of 45 °C for oxidation reaction , after the oxidation reaction was completed, centrifuged and washed with water until neutral, and dried in vacuum at 55 °C overnight to obtain carboxylated carbon nanotubes (COOH-MWCNTs); then 400 mg of carboxylated carbon nanotubes were added to 50 mL of thionyl chloride ( SOCl 2 ) and 2 mL of dimethylformamide (DMF), stirred at 70 °C for 20 hours, centrifuged and washed 5 times with anhydrous tetrahydrofuran (THF), dried, and ...

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Abstract

The invention discloses a preparation method of an electrochemical biosensor for detecting lead ions based on a rapid scanning cyclic voltammetry technology and application thereof. The preparation method is characterized by comprising the following steps: (1), preparing a magnetic amino functionalized multi-walled carbon nanotube mixed solution by adopting a traditional hydrothermal method; (2),adding tetra (4-carboxyphenyl) porphin into the magnetic amino functionalized multi-walled carbon nanotube mixed solution, and obtaining an NH2-MWCNTs@Fe3O4 / TCPP mixed solution through combination ofamino and carboxyl; (3), dropwise coating the surface of the pretreated magnetic glassy carbon electrode with the NH2-MWCNTs@Fe3O4 / TCPP mixed solution enriched with Pb <2+>; firmly absorbing the nanocomposite material on the surface of the electrode through the magnetic action, and completing the preparation of the electrochemical sensor by naturally airing at a room temperature. The electrochemical biosensor can be used in the application of detecting lead ions by a rapid scanning cyclic voltammetry technology, and has the advantages of high sensitivity, high selectivity and simple and rapidoperation.

Description

technical field [0001] The invention relates to the technical field of heavy metal ion detection, in particular to a preparation method and application of an electrochemical sensor for detecting lead ions based on fast scanning cyclic voltammetry technology. Background technique [0002] Lead ion Pb(II), a trace pollutant in the ecosystem, is widely used in synthetic pigments, anti-corrosion coatings, batteries and other alloys. Unlike organic pollutants, lead is non-degradable in the environment. Lead discharged into water and soil will not only pollute the environment, but also accumulate in the human body through the food chain. Lead is one of the toxic and harmful substances that affect human health. Pb in drinking water 2+ The maximum allowable value of water is 48 nmol / L stipulated by the World Health Organization (WHO) in the water quality standard. Exceeding a certain standard can cause lead poisoning, which can damage the human body's hematopoietic system, cardiova...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/48G01N27/308
Inventor 张春风郭智勇郝婷婷康凯籍雪平牛凌梅康维钧黄又举
Owner NINGBO UNIV
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