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Electrochemical sensor for selectively detecting nitrite ions as well as preparation method and application of electrochemical sensor

A nitrite ion, sensor technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., to achieve the effect of improving sensitivity, high sensitivity and high selectivity

Active Publication Date: 2021-02-23
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the reports in the literature are to encapsulate single functional nanomaterials in the cavity of MOFs. However, single functional materials have certain limitations in terms of catalytic performance.

Method used

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  • Electrochemical sensor for selectively detecting nitrite ions as well as preparation method and application of electrochemical sensor
  • Electrochemical sensor for selectively detecting nitrite ions as well as preparation method and application of electrochemical sensor
  • Electrochemical sensor for selectively detecting nitrite ions as well as preparation method and application of electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of electrochemical sensor

[0037] 1. Add 0.87g Cu(NO 3 ) 2 ·3H 2 0, 1.24mL of acetic acid and 1.0mL of trimethylamine (TEA) were added in 24mL of ethanol solution, ultrasonically obtained a uniform solution, 0.42g of trimesic acid (H 3 BTC) was added to the above solution, and the mixed solution was obtained after ultrasonic treatment, and the mixed solution was reacted at room temperature for 24 hours, and then treated with CH 3 OH washing and centrifugation to obtain Cu-MOFs after drying;

[0038] 2. Preparation of Cu-MOF@ZIF-8 and Cu@C@ZIF-8: 100mg Cu-MOFs dispersed in 100mL CH 3 1mg·mL in OH -1 Cu-MOFs solution, disperse 0.7g polyvinylpyrrolidone (PVP) in 20mL CH 3 The PVP solution was obtained in OH, and the PVP solution was added dropwise to the Cu-MOFs solution, and the mixed solution was obtained after ultrasonic treatment, and the mixed solution was stirred at room temperature for 12 hours, and then treated with CH 3 OH wa...

Embodiment 2

[0041] Embodiment 2: detect the concentration of nitrite ion

[0042] Nitrite ion solutions with different concentrations (0.1μμM, 0.5μμM, 3.0μμM, 5.0μμM, 10.0μμM, 20.0μμM, 50.0μM, 70.0μμM, 100.0μμM, 200.0μμM and 300.0μM) were added to the pH 6.0 In the phosphate buffer, the electrochemical sensor prepared in Example 1 was connected to the test circuit, and the nitrite ion concentration was measured by differential pulse voltammetry (see image 3 A), take the nitrite ion concentration as the abscissa (in μM), and take the oxidation peak current value as the ordinate (in μA), establish a standard curve y=5.640+0.262x (R 2 = 0.995).

[0043] like image 3 As shown in B, the modified electrode has a good linear relationship to nitrite ions (R 2 =0.995), and has a wide linear range (0.1 μM-300.0 μM) and a low detection limit (0.033 μM), fully indicating that the sensing electrode can successfully detect unknown concentrations of nitrite ions.

[0044] Using ZIF-8, Cu-MOF@ZIF-8...

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Abstract

The invention discloses an electrochemical sensor for efficiently and selectively detecting nitrite ions. CuMOF@ZIF-8 with a core-shell heterostructure is prepared; a Cu@C@ZIF-8 composite material with a core-shell heterostructure is synthesized by pyrolyzing Cu-MOF@ZIF-8 in an argon atmosphere on the basis of the thermal stability difference between Cu-MOF and ZIF-8; a Cu@C@ZIF-8 modified glassycarbon electrode (Cu@C@ZIF-8 / GCE) is used as an electrochemical sensor, and nitrite ions are subjected to electrochemical detection in an electrolyte solution; and the Cu@C@ZIF-8 / GCE shows good detection sensitivity and excellent selectivity on the nitrite ions. The electrochemical sensor constructed in the invention can realize quantitative analysis of the nitrite ions, and can rapidly detect thenitrite ions.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an electrochemical sensor for selectively detecting nitrite ions, a preparation method and application thereof. Background technique [0002] Nitrite is one of the most widely used industrial salts and is often used as a dietary supplement and preservative in cooked foods, sausages and sauerkraut. However, the excessive use of nitrite as a preservative in the food and beverage industry is harmful to ecosystems and human health. In addition, the presence of nitrite in the stomach interacts with amines and amides to form N-nitrosamine compounds, which are carcinogens. To date, various strategies for the analysis of nitrite ions have been developed, such as atomic absorption / emission spectroscopy, electrochemical sensors, X-ray fluorescence spectroscopy, surface-enhanced Raman scattering, and colorimetric spectroscopy. Electrochemical methods, in particular, are go...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30G01N27/333
CPCG01N27/26G01N27/30G01N27/333
Inventor 卢丽敏涂小龙黄喜根高艳莎汪小强刘书武邹佳敏
Owner JIANGXI AGRICULTURAL UNIVERSITY
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