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A nitrogen-doped carbon nanotube modified electrochemical sensor and its application

A technology of nitrogen-doped carbon and nanotubes, applied in the field of sensors, can solve the problems of high instrument requirements, unsuitable sample pretreatment process for high-throughput, real-time on-site screening technology, and expensive analysis costs, etc., to achieve high sensitivity The measurement and production methods are simple and easy, and the effect of low cost

Active Publication Date: 2016-11-02
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have high requirements for instruments, expensive analysis costs, and complicated sample pretreatment processes are not suitable for high-throughput, real-time on-site screening techniques.

Method used

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  • A nitrogen-doped carbon nanotube modified electrochemical sensor and its application
  • A nitrogen-doped carbon nanotube modified electrochemical sensor and its application
  • A nitrogen-doped carbon nanotube modified electrochemical sensor and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of the working electrode of the electrochemical sensor is as follows:

[0031] 1) NiNO 3 After mixing with NaY molecular sieve according to the weight ratio of 1:1, dissolve in distilled water, filter and dry, grind the dried sample and put it into a small porcelain boat, heat it to 1123 K in a quartz tube furnace, and then pass it through at a constant flow rate Into N 2 / diethylamine mixed gas, kept at constant temperature for 3h, cooled naturally, and black CN was obtained x The mixture with Ni / NaY catalyst, after removing the molecular sieve catalyst in HF solution, nitrogen-doped carbon nanotubes can be obtained. figure 2 is the SEM image of the obtained nitrogen-doped carbon nanotubes. image 3 is the XRD pattern of the obtained nitrogen-doped carbon nanotubes.

[0032] 2) Accurately weigh 3 mg of the nitrogen-doped carbon nanotubes obtained above, add to 10 mL of ethanol, and oscillate ultrasonically for 10 min to disperse into a uni...

Embodiment 2

[0037] The preparation method of the working electrode of the electrochemical sensor is as follows:

[0038] 1) NiNO 3 After mixing with NaY molecular sieve according to the weight ratio of 2:1, dissolve with distilled water, filter and dry, grind the dried sample and put it into a small porcelain boat, heat it to 1223 K in a quartz tube furnace, and then pass it through at a constant flow rate Into N 2 / Diethylamine mixed gas, kept at constant temperature for 4 hours, cooled naturally, and black CN was obtained xThe mixture with Ni / NaY catalyst, after removing the molecular sieve catalyst in HF solution, nitrogen-doped carbon nanotubes can be obtained.

[0039] 2) Weigh 5 mg of the nitrogen-doped carbon nanotubes obtained in step (1), add it to 10 mL of ethanol, and oscillate ultrasonically for 20 min to disperse into a uniform black suspension.

[0040] 3) Apply the dispersion liquid described in step (2) onto the surface of the glassy carbon electrode (Φ=3mm), and let it...

Embodiment 3

[0043] The preparation method of the working electrode of the electrochemical sensor is as follows:

[0044] 1) NiNO 3 After mixing with NaY molecular sieve according to the weight ratio of 1:2, dissolve with distilled water, filter and dry, grind the dried sample and put it into a small porcelain boat, heat it to 1023 K in a quartz tube furnace, and then pass it into N 2 / Diethylamine mixed gas, kept at constant temperature for 1h, cooled naturally to obtain black CN x The mixture with Ni / NaY catalyst, after removing the molecular sieve catalyst in HF solution, nitrogen-doped carbon nanotubes can be obtained.

[0045] 2) Stir the nitrogen-doped carbon nanotubes prepared in step (1) in HF solution for 8 hours, remove the molecular sieve catalyst, accurately weigh 2 mg, add it to 10 mL of ethanol, and oscillate ultrasonically for 6 minutes to disperse into a uniform black suspension liquid.

[0046] 3) Apply the dispersion liquid described in step (2) dropwise on the surfac...

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Abstract

The invention belongs to the technical field of sensors, and particularly relates to an electrochemical sensor modified by a nitrogen-doped carbon nano-tube and application of the electrochemical sensor. The electrochemical sensor is a sensor with a three-electrode system, and a modified electrode formed by coating a glassy carbon electrode by a nitrogen-doped carbon nano-tube response membrane is used as a working electrode; and the electrochemical sensor can be used for detecting trace lead. During detection, the glassy carbon electrode coated by the nitrogen-doped carbon nano-tube response membrane is used as the working electrode, a platinum sheet is used as a counter electrode, Ag / AgCl (saturated KCl) is used as a reference electrode, and lead ions are detected in a cyclic voltammetry working manner. The electrochemical sensor disclosed by the invention is simple in preparation, stable in performance and capable of being repeatedly utilized; the electrochemical sensor realizes simple, convenient and rapid detection on lead ions, and is stable in performance and capable of being repeatedly utilized; and the electrochemical sensor is high in detection sensitivity and capable of achieving lower detection limit of 0.06 muM.

Description

technical field [0001] The invention relates to a sensor, in particular to an electrochemical sensor modified with nitrogen-doped carbon nanotubes and its application. Background technique [0002] Lead, as a kind of off-white, soft heavy metal, is one of the "five poisonous elements" in environmental monitoring, which is a serious hazard to human health and the environment. After lead is inhaled into the human body in the form of inorganic substances or dust, or invades the human body through water and food through the digestive tract, it will damage the human digestive system, nervous system, and hematopoietic system, etc. Therefore, the detection of lead ions has attracted more and more attention from various countries. [0003] The currently reported detection methods for trace lead include dithizone spectrophotometry, polarography, X-ray fluorescence spectrometry (XRF), flame atomic absorption spectrophotometry (FAAS), and graphite furnace atomic absorption spectrophoto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 王利军李善金
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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