Electrochemical sensor for detecting benomyl and preparation method thereof

An electrochemical and sensor technology, applied in the field of electrochemical sensors for fast and efficient detection of benomyl and its preparation, can solve problems such as agglomeration and stacking, and achieve the effects of fast response speed, significant selectivity, and strong anti-interference.

Active Publication Date: 2022-04-26
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, individual 1D or 2D materials face agglomeration and heavy stacking problems

Method used

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  • Electrochemical sensor for detecting benomyl and preparation method thereof
  • Electrochemical sensor for detecting benomyl and preparation method thereof
  • Electrochemical sensor for detecting benomyl and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of electrochemical sensors

[0036] 1. Add 0.2557g CuCl 2 2H 2 O was dissolved in 30 mL ultrapure water to obtain blue transparent CuCl 2 solution. Then add 15mg MWCNTs-COOH, ultrasonic treatment for 30min (power: 100W, frequency: 60kHz), and fully adsorb copper ions on the surface of MWCNTs-COOH through electrostatic interaction. Add 91 μL of hydrazine hydrate to the above suspension, stir at room temperature for 4 hours, wash with ultrapure water three times and collect by centrifugation (8000rmp, 5min), and dry at 60°C for 10 hours to obtain nano-Cu x O / MWCNTs-COOH. The same amount of nano-Cu x O / MWCNTs-COOH and MXene were dispersed in DMF respectively, and nano-Cu was obtained after ultrasonic treatment for 30 min x O / MWCNTs-COOH dispersion and MXene dispersion, the nano-Cu x The O / MWCNTs-COOH dispersion was added to the MXene dispersion, and nano-Cu was obtained after ultrasonic treatment for 30 min x O / MWCNTs-COOH / MXene mixture.

[0037] 3. Be...

Embodiment 2

[0040] Detection of Benomyl Concentration

[0041] In a phosphate buffer solution (pH=7.0) containing different concentrations of benomyl (10.0nM, 30.0nM, 50.0nM, 300.0nM, 500.0nM, 1.0μM, 3.0μM, 5.0μM, 7.0μM, 10.0μM), the The electrochemical sensor prepared in Example 1 is connected to the test circuit, and the concentration of benomyl is measured by differential pulse voltammetry, with the concentration of benomyl as the abscissa (unit is μM), and the oxidation peak current value as the ordinate (unit is μ A), establish standard curve: y=1.189+4.911c (R 2 = 0.992).

[0042] Such as image 3 As shown, the modified electrode has a good linear relationship to benomyl (R 2 =0.992), and has a wide linear range (10.0nM-10.0μM) and a low detection limit (3.0nM), which fully demonstrates that the sensing electrode can successfully detect benomyl of unknown concentration.

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Abstract

The invention discloses an electrochemical sensor for detecting benomyl and a preparation method of the electrochemical sensor, firstly nano-CuxO is modified on MWCNTs-COOH, then nano-CuxO is embedded into MXene nanosheets through ultrasonic treatment, and a nano-CuxO / MWCNTs-COOH / MXene composite material with a multi-dimensional hybrid structure is synthesized. A nano-CuxO / MWCNTs-COOH / MXene modified glassy carbon electrode (nano-CuxO / MWCNTs-COOH / MXene / GCE) is used as an electrochemical sensor, and the benomyl is subjected to electrochemical detection in an electrolyte solution. The nano-CuxO / MWCNTs-COOH / MXene / GCE shows excellent catalytic property and sensitivity when being used for electrochemical detection of the benomyl. The electrochemical sensor constructed by the invention can realize quantitative analysis and rapid detection of benomyl.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an electrochemical sensor for fast and efficient detection of benomyl and a preparation method thereof. Background technique [0002] Benomyl is a highly effective benzimidazole fungicide, widely used in the control of fungal diseases in food production, agriculture and forestry and other industries. However, due to the bioactive effects and chronic toxicity of benomyl, its residues will cause serious environmental pollution and human health problems. Therefore, an efficient analytical method for benomyl is of great importance for sustainable agriculture and food security. So far, various analytical methods have been developed for the detection of benomyl, such as fluorescence, electrochemical, liquid chromatography, and fluorescence polarization. Among them, the electrochemical method has aroused great interest of researchers because of its simple operation, lo...

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 卢丽敏钟蔚高凤刘书武高艳莎黄喜根
Owner JIANGXI AGRICULTURAL UNIVERSITY
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