Electrochemical sensor for detecting nitrite, preparation method and application

A nitrite and sensor technology, applied in the field of electrochemical analysis, can solve problems such as poor conductivity, and achieve the effects of easy control of the process, overcoming time-consuming, and high specific recognition ability

Active Publication Date: 2020-12-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is just based on the above description, and the purpose is to provide a preparation method and application thereof of a titanium dioxide-titanium carbide / hexadecyltrimethylammonium bromide / chitosan electrochemical sensor. The disadvantage of poor performance, and the catalytic effect on nitrite is obvious. At the same time, the sensor has the advantages of high sensitivity and fast response speed.

Method used

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  • Electrochemical sensor for detecting nitrite, preparation method and application
  • Electrochemical sensor for detecting nitrite, preparation method and application
  • Electrochemical sensor for detecting nitrite, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of sensors

[0030] ① Slowly add 1.0g aluminum carbon titanium oxide to 20mL 40wt% hydrogen fluoride, carry out stirring etching at 40°C for 24 hours, centrifuge the product after the reaction is completed, until the pH value of the supernatant is between 5 and 6, filter, Dry under vacuum at 80°C for 24 hours to obtain titanium carbide;

[0031] ②Using titanium carbide as the titanium source, titanium carbide is calcined in two stages, the first stage is calcined in air at 200°C for 1 hour, the second stage is calcined in nitrogen at 500°C for 1 hour, and the temperature is naturally cooled to obtain titanium dioxide-titanium carbide Complex;

[0032] ③ Disperse the titanium dioxide-titanium carbide compound in a solution containing cetyltrimethylammonium bromide and chitosan, and obtain titanium dioxide-titanium carbide / cetyltrimethylammonium bromide through ultrasonic dispersion / chitosan dispersion, wherein the concentration of titanium dioxide-titanium...

Embodiment 2

[0038] Preparation of sensors

[0039] ① Slowly add 0.8g aluminum carbon titanium oxide to 20mL 40wt% hydrogen fluoride, carry out stirring etching at 30°C for 48 hours, centrifuge the product after the reaction is completed, until the pH value of the supernatant is between 5 and 6, filter, Dry under vacuum at 80°C for 24 hours to obtain titanium carbide;

[0040] ②Using titanium carbide as the titanium source, titanium carbide is calcined in two stages, the first stage is calcined in the air at 200°C for 0.5h, the second stage is calcined in nitrogen at 500°C for 2h, and the temperature is naturally cooled to obtain titanium dioxide-carbide Titanium complex;

[0041] ③ Disperse the titanium dioxide-titanium carbide compound in a solution containing cetyltrimethylammonium bromide and chitosan, and obtain titanium dioxide-titanium carbide / cetyltrimethylammonium bromide through ultrasonic dispersion / chitosan dispersion, wherein, the concentration of titanium dioxide-titanium ...

Embodiment 3

[0046] Preparation of sensors

[0047] ① Slowly add 1.2g aluminum carbon titanium oxide to 20mL 40wt% hydrogen fluoride, carry out stirring etching at 50°C for 6 hours, centrifuge the product after the reaction is completed, until the pH value of the supernatant is between 5 and 6, filter, Dry under vacuum at 80°C for 24 hours to obtain titanium carbide;

[0048] ②Using titanium carbide as the titanium source, titanium carbide is calcined in two stages, the first stage is calcined in air at 200°C for 2 hours, the second stage is calcined in nitrogen at 500°C for 1 hour, and the temperature is naturally cooled to obtain titanium dioxide-titanium carbide Complex;

[0049] ③ Disperse the titanium dioxide-titanium carbide compound in a solution containing cetyltrimethylammonium bromide and chitosan, and obtain titanium dioxide-titanium carbide / cetyltrimethylammonium bromide through ultrasonic dispersion / chitosan dispersion, wherein, the concentration of titanium dioxide-titaniu...

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Abstract

The invention discloses an electrochemical sensor for detecting nitrite, a preparation method and application, and belongs to the field of electrochemical analysis. The preparation method comprises the following steps of: etching aluminum carbide to obtain titanium carbide with of accordion-like structure, calcining the titanium carbide serving as a titanium source to obtain titanium dioxide-titanium carbide, dispersing the compound into a solution containing hexadecyl trimethyl ammonium bromide and chitosan, and performing ultrasonic treatment to obtain a composite solution. According to theelectrochemical sensor for detecting nitrite, the preparation method and the application, a three-electrode system is adopted, a glassy carbon electrode modified by a titanium dioxide titanium carbide / hexadecyl trimethyl ammonium bromide / chitosan compound is used as a working electrode, and the nitrite is determined by differential pulse voltammetry. The electrochemical sensor disclosed by the invention has the advantages of high sensitivity, good selectivity, low detection limit, quick response and the like in nitrite detection, and has a wide application prospect in the aspects of environment and food detection.

Description

technical field [0001] The invention belongs to the field of electrochemical analysis, and relates to an electrochemical sensor for detecting nitrite, a preparation method and an application thereof. Background technique [0002] Nitrite is widely present in natural water, wastewater and food because it is often used as food additives, fertilizers and corrosion inhibitors. However, nitrite is a pollutant that is harmful to the environment and human health, so the concentration level of nitrite is a very important parameter to ensure environmental and biological safety. On the one hand, excessive nitrite in the human body can lead to irreversible oxidation of hemoglobin. On the other hand, nitrite interacts with amines and is transformed into carcinogenic nitrosamines, which pose serious hazards to human and animal health. Therefore, it is very important to establish an analytical method for the detection of nitrite with high sensitivity and high selectivity. [0003] The ...

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 王雪李梦佳杨爽
Owner DALIAN UNIV OF TECH
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