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Few-layer MXene-ionic liquid droplet modified electrode as well as preparation method and application thereof in detection of Sudan red

A technology of ionic liquids and modified electrodes, which is applied in the direction of material electrochemical variables, etc., can solve the problems of expensive equipment, high cost, and long time consumption, and achieve the effects of low cost, improved sensitivity, and good conductivity

Active Publication Date: 2021-10-26
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods for detecting Sudan I include liquid chromatography, nuclear magnetic resonance spectroscopy, thin-layer chromatography and liquid chromatography-mass spectrometry, but these methods require expensive equipment, high cost, and time-consuming

Method used

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  • Few-layer MXene-ionic liquid droplet modified electrode as well as preparation method and application thereof in detection of Sudan red
  • Few-layer MXene-ionic liquid droplet modified electrode as well as preparation method and application thereof in detection of Sudan red
  • Few-layer MXene-ionic liquid droplet modified electrode as well as preparation method and application thereof in detection of Sudan red

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Few-layer MXene-ionic liquid (few-layer MXene-IL) droplet modified electrode

[0033] (1) The preparation method is as follows

[0034] 1. Preparation of few-layer MXene

[0035] 1) Add 0.8g LiF to 10mL 12M hydrochloric acid, and stir continuously for 5 minutes to obtain etchant. 0.5 g of multi-layer MXene powder was gradually added to the above-mentioned etchant within 5 min, and reacted at 40-50° C. for 24 h to obtain a mixture.

[0036] 2) Washing with hydrochloric acid: The mixture obtained in step 1) was washed three times by centrifugation (3500 rpm, 5 min each time) with 1M hydrochloric acid. After each wash, the supernatant was removed as waste by decanting.

[0037] 3) Washing with water: the product obtained in step 2) was washed several times by centrifugation (3500 rpm, 5 min each time) with deionized water, and after each washing, the acidic supernatant was removed as waste by dumping. Repeat washing with water until the supernatant pH=6, add ...

Embodiment 2

[0047] Example 2 Application of few-layer MXene-ionic liquid (few-layer MXene-IL) droplet modified electrode in detection of Sudan Red Ⅰ

[0048] The method is as follows: the modified electrode is used as the working electrode, the Ag / AgC1 electrode is used as the reference electrode, and the platinum wire is used as the counter electrode. The three-electrode system is placed in a phosphate buffer solution containing Sudan Red I, and the electrochemical measurement is performed using a CHI760e electrochemical workstation. , using cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance for electrochemical testing. Draw a standard electrochemical curve graph based on the electrochemical signal data of the electrochemical measurement. In the phosphate buffer solution containing Sudan Red I, the concentration range of Sudan Red I was determined to be 1×10 -8 M-5×10 -5 M, pH=7 of the phosphate buffer solution.

[0049] The working electrode is selected...

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Abstract

The invention relates to a few-layer MXene-ionic liquid droplet modified electrode as well as a preparation method and application thereof in detection of Sudan red. The preparation method comprises the steps: adding a proper amount of few-layer MXene into ionic liquid, controlling the ultrasonic temperature to be 20 DEG C or less, performing ultrasonic oscillation for 30-40 minutes, and fully mixing to obtain a few-layer MXene-ionic liquid composite material; and taking a few-layer MXene-ionic liquid composite material, coating the surface of a glassy carbon electrode with the MXene-ionic liquid composite material, and placing the glassy carbon electrode at room temperature for 20-30 minutes to enable the composite material to be fully combined with the surface of the glassy carbon electrode so as to prepare the few-layer MXene-ionic liquid droplet modified electrode. The prepared few-layer MXene-ionic liquid droplet modified electrode shows excellent electrocatalytic activity, wide linear range and low detection limit on Sudan red I. In the detection process, the electrode is easy to operate, rapid in response and high in sensitivity, and is a novel, simple and low-cost electrochemical sensor.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to a few-layer MXene-ionic liquid droplet modified electrode, a preparation method thereof and an application in detecting Sudan I. Background technique [0002] Sudan I is a synthetic fat-soluble azo pigment that gives the product its red color. It can be used in engine oil, car wax, textile colorant and other fields. However, it is used as a food coloring in some countries, such as hot sauce, tomato sauce and many other commonly eaten foods are added with Sudan Red I. But Sudan I is currently considered unsafe because it is a potential human carcinogen and mutagen. In 1975, it was listed as a Group III carcinogen by the International Agency for Research on Cancer (IARC). Existing methods for detecting Sudan I include liquid chromatography, nuclear magnetic resonance spectroscopy, thin-layer chromatography and liquid chromatography-mass spectrometry, but these me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48G01N27/26
CPCG01N27/30G01N27/48G01N27/26
Inventor 宋溪明赵楠吴抒遥姜美娇陈奇男隋成荃章好迪
Owner LIAONING UNIVERSITY
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