Nitrogen-doped mesoporous carbon modified cadmium and lead electrochemical sensor and manufacturing method thereof

A nitrogen-doped mesoporous carbon, electrochemical technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve complex and toxic formaldehyde problems, achieve good reproducibility, low price, simple and convenient synthesis Effect

Active Publication Date: 2017-05-31
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the soft template method, toxic formaldehyde is used in the synthesis process, and the process of self-assembly to form a soft template is very complicated.

Method used

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  • Nitrogen-doped mesoporous carbon modified cadmium and lead electrochemical sensor and manufacturing method thereof
  • Nitrogen-doped mesoporous carbon modified cadmium and lead electrochemical sensor and manufacturing method thereof
  • Nitrogen-doped mesoporous carbon modified cadmium and lead electrochemical sensor and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] a. Dissolve 5g of p-phenylenediamine in methanol, slowly add 2 times of 20% sulfuric acid dropwise to the p-phenylenediamine / methanol solution in an ice-water bath and mix, and stir for 1 hour at room temperature to generate p-phenylenediamine Sulfate precipitation, and then rotary steaming to separate methanol, the obtained p-diphenylamine sulfate, then put the p-diphenylamine sulfate in a vacuum drying oven at a temperature of 80°C for 24 hours, and then place it in a tube furnace for carbonization. The heating rate was raised from room temperature to 900°C at a heating rate of / min, carbonized for 2 hours, and nitrogen-doped mesoporous carbon derived from p-diphenylamine sulfate was obtained after natural cooling;

[0038] Preparation of nitrogen-doped mesoporous carbon-Nafion electrode derived from p-diphenylamine sulfate:

[0039] b. Bare glassy carbon electrodes use 1.0, 0.3 and 0.05 μm Al respectively 2 o 3 Powder polishing, followed by ultrasonic cleaning in e...

Embodiment 2

[0046] Detection of water samples by the sensor of the present invention:

[0047] The HAc-NaAc solution with pH=4.5 was formulated with laboratory tap water samples, and 10ml of the prepared solution was taken as the electrolyte (containing 400μg / L Bi 3+ ), the amount of heavy metal added is (μg / L): 0, 6, 8, 10, 30, 50, 110, record the peak current intensity under different concentrations, and then calculate the recovery rate and relative standard deviation according to the linear equation in Table 3.

[0048] table 3

[0049]

[0050]

[0051] As can be seen from the table: the recovery rate of heavy metals is between 99%-108%, indicating that the cadmium-lead electrochemical sensor modified by nitrogen-doped mesoporous carbon of the present invention has better detection results for water samples. Effect.

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Abstract

The invention discloses a nitrogen-doped mesoporous carbon modified cadmium and lead electrochemical sensor and a manufacturing method thereof. The electrochemical sensor consists of a working electrode modified by nitrogen-doped mesoporous carbon-bismuth film-Nafion, an Ag / AgCl reference electrode, a Pt wire counter electrode, an electrolytic tank and an electrochemical working station; the detection ranges of the sensor to cadmium and lead are both 4 to 130mumgL<-1>; the detection limits are lower than a standard drinking water value given by WHO (World Health Organization) by 10 and 25 times; meanwhile, high reproducibility, stability and interference resistance are realized; in detection of cadmium and lead content in tap water, the sensor shows high sensitivity and accuracy. The sensor can simultaneously detect the content of cadmium ions and lead ions accurately and rapidly on the spot, so that the sensor has a good practical application prospect.

Description

technical field [0001] The invention relates to a nitrogen-doped mesoporous carbon-modified cadmium-lead electrochemical sensor and a preparation method thereof, in particular to the preparation of a nitrogen-doped mesoporous carbon / Nafion / bismuth film modified electrode derived from p-diphenylamine sulfate and cadmium, lead Construction of ionic electrochemical sensors. Background technique [0002] With the development of society and the popularization of industry, the problem of heavy metal pollution cannot be ignored. Once discharged, heavy metals can easily permeate into groundwater or rivers, which undoubtedly brings great harm to the ecosystem and human health. Although most heavy metals exist in multiple forms in the environment, each form has different hazards, but they are all highly carcinogenic, and some forms are even more toxic after reacting with soil microorganisms and oxygen in water. Among the many heavy metal pollutants, cadmium and lead are common pollu...

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 胡广志覃丹凤夏木西卡玛尔·买买提王乐
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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