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A kind of preparation method of the electrochemical sensor that detects butyl p-hydroxybenzoate

A butyl hydroxybenzoate, electrochemical technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve problems such as complex detection steps, achieve the effect of simple operation, portability, and improved activity

Active Publication Date: 2020-11-03
FUYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a fast, simple and accurate electronic method for overcoming the defects in the prior art that the detection of the preservative butyl p-hydroxybenzoate can only be completed by means of expensive instruments, and the detection steps are complicated. Preparation method of chemical sensor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of electrochemical sensors:

[0025] (1) Modification of flexible graphite: Add 40g of flexible graphite into deionized water, reflux and stir for 20min, then add 10g titanate coupling agent and 0.1g chain extender, and continue to reflux and stir for 2h;

[0026] (2) Loading: Add 10 g of nano-titanium dioxide to the solution in step 1, reflux and stir for 2 hours, cool down to 70 °C, add 0.1 g of castor oil and 1 g of coagent, continue stirring for 30 min, filter while it is hot, wash the solid with deionized water to remove impurities, Vacuum dried at 50°C to constant weight;

[0027] (3) Dispersion: Add the solid in step 2 to absolute ethanol, and ultrasonically disperse for 2 hours to obtain a dispersion;

[0028] (4) Pretreatment of the glassy carbon electrode: Polish the glassy carbon electrode with 0.3 μm and 0.05 μm alumina polishing powder respectively, rinse with water, and then use 50% ethanol solution and deionized water to ultrasonically Wash ...

Embodiment 2

[0032] Preparation of electrochemical sensors:

[0033] (1) Modification of flexible graphite: Add 42g of flexible graphite into deionized water, reflux and stir for 20min, then add 12g of titanate coupling agent and 0.1g of chain extender, and continue to reflux and stir for 2h;

[0034] (2) Loading: Add 11g of nano-titanium dioxide to the solution in step 1, reflux and stir for 2h, cool down to 70°C, add 0.1g castor oil and 1.5g coagent, continue stirring for 30min, filter while hot, wash the solid with deionized water to remove impurities , dried in vacuum at 50°C to constant weight;

[0035] (3) Dispersion: Add the solid in step 2 to absolute ethanol, and ultrasonically disperse for 2 hours to obtain a dispersion;

[0036] (4) Pretreatment of the glassy carbon electrode: Polish the glassy carbon electrode with 0.3 μm and 0.05 μm alumina polishing powder respectively, rinse with water, and then use 50% ethanol solution and deionized water to ultrasonically Wash for 3 minu...

Embodiment 3

[0063] Based on Example 1, Comparative Example 1 without titanate coupling agent and chain extender, Comparative Example 2 without castor oil, and Comparative Example 3 without coagent were set.

[0064] Examples 1-2 and Comparative Examples 1-3 were used to prepare an electrochemical sensor and use it to determine the concentration of butyl p-hydroxybenzoate in dried spiced tofu. The results are shown in Table 1.

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Abstract

The invention discloses a preparation method of an electrochemical sensor for detecting butyl p-hydroxybenzoate, and relates to the technical field of electrochemical sensors. The preparation method comprises the steps of modification of flexible graphite, loading, dispersion, pretreatment of a glassy carbon electrode and preparation. Improved flexible graphite modified nano titanium dioxide is used as a sensor sensitive material, is simple and convenient to prepare and low in cost, and has the advantages of large specific surface area, good conductivity and high enrichment capacity, and a uniform film can be formed on the surface of the electrode by methods of simple drip coating and solvent evaporation; and the preparation method is simple and convenient to operate, special experiment conditions are not required, and the electrochemical sensor is convenient to carry and high in practicality, and cannot damage an ecological environment and operators.

Description

Technical field: [0001] The invention relates to the technical field of electrochemical sensors, in particular to a preparation method of an electrochemical sensor for detecting butyl p-hydroxybenzoate. Background technique: [0002] Butyl p-hydroxybenzoate, also known as paraben, is a series of preservatives with the widest application, the largest amount, and the highest frequency of application in the world. Based on its high efficiency, non-volatility, wide range of pH applications, and good bactericidal ability , easy compatibility and good chemical stability are widely used in daily chemicals, cosmetics, medicine, food, feed and various industrial anti-corrosion aspects. In recent years, with the development of society and economy, the amount of paraben preservatives has gradually increased, and the amount of residues in the environment has increased day by day. Due to the relatively strong acidity and corrosiveness of butyl paraben, people with hyperacidity and child...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 黄德乾
Owner FUYANG NORMAL UNIVERSITY
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