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Electrochemical sensor for simultaneously detecting cadmium and lead ions and preparation method

An electrochemical, lead ion technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of low conductivity, easy aggregation, poor dispersion, etc., to improve sensitivity and sensing speed, improve electron transmission. Effect

Inactive Publication Date: 2014-09-03
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

However, the above-mentioned modified materials may have problems such as poor dispersion, easy aggregation after modification, poor acid-base stability, and low conductivity.

Method used

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  • Electrochemical sensor for simultaneously detecting cadmium and lead ions and preparation method
  • Electrochemical sensor for simultaneously detecting cadmium and lead ions and preparation method
  • Electrochemical sensor for simultaneously detecting cadmium and lead ions and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of nitrogen-doped microporous carbon

[0021] At room temperature, 1.032g Zn(NO 3 ) 2 ·5H 2 O and 1.052g dimethylimidazole were respectively dissolved in 80mL of methanol and left to stand for 24 hours, then the methanol solution of dimethylimidazole was poured into the methanol solution of zinc nitrate, centrifuged, and methanol and N,N-dimethylimidazole Washing with methylformamide, drying at room temperature to obtain a white powder zeolite imidazole metal skeleton compound-8, the zeolite imidazole metal skeleton compound-8 presents a rhombic dodecahedron, and the average particle diameter is about 80nm ( image 3 b); Then put the zeolite imidazole metal skeleton compound-8 into the porcelain boat, put the porcelain boat into the tube furnace (GSL-1500X, Hefei Kejing), raise the temperature to 600°C at 5°C / min, and calcinate for 5 hours , and then lowered to room temperature at a cooling rate of 5°C / min to obtain a black powder, then soaked in 35wt.% h...

Embodiment 2

[0030] Preparation of nitrogen-doped microporous carbon

[0031] At room temperature, 1.032g Zn(NO 3 ) 2 ·5H 2 O and 1.052g dimethylimidazole were respectively dissolved in 80mL of methanol, and left to stand for 24 hours, then the methanol solution of dimethylimidazole was poured into the methanol solution of zinc nitrate, centrifuged, and methanol and N,N-dimethylimidazole Washing with methylformamide, drying at room temperature to obtain a white powder zeolite imidazole metal skeleton compound-8, the zeolite imidazole metal skeleton compound-8 presents a rhombic dodecahedron, and the average particle diameter is about 80nm ( image 3 b); Then put the zeolite imidazole metal skeleton compound-8 into the porcelain boat, put the porcelain boat into the tube furnace (GSL-1500X, Hefei Kejing), raise the temperature to 600°C at 5°C / min, and calcinate for 5 hours , and then lowered to room temperature at a cooling rate of 5°C / min to obtain a black powder, then soaked in 35wt.% ...

Embodiment 3

[0040] Preparation of nitrogen-doped microporous carbon

[0041] At room temperature, 1.032g Zn(NO 3 ) 2 ·5H 2 O and 1.052g dimethylimidazole were respectively dissolved in 80mL of methanol, and left to stand for 24 hours, then the methanol solution of dimethylimidazole was poured into the methanol solution of zinc nitrate, centrifuged, and methanol and N,N-dimethylimidazole Washing with methylformamide, drying at room temperature to obtain a white powder zeolite imidazole metal skeleton compound-8, the zeolite imidazole metal skeleton compound-8 presents a rhombic dodecahedron, and the average particle diameter is about 80nm ( image 3b); Then put the zeolite imidazole metal skeleton compound-8 into the porcelain boat, put the porcelain boat into the tube furnace (GSL-1500X, Hefei Kejing), raise the temperature to 600°C at 5°C / min, and calcinate for 5 hours , and then lowered to room temperature at a cooling rate of 5°C / min to obtain a black powder, then soaked in 35wt.% h...

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Abstract

The invention relates to an electrochemical sensor for simultaneously detecting cadmium and lead ions and a preparation method. The sensor is composed of an electrochemical work station, a working electrode, a counter electrode, a reference electrode and an electrolytic tank, wherein the working electrode adopts a glassy carbon electrode as a base, and a Nafion / N-doped micropore carbon composite membrane is modified on the surface of the working electrode; the electrochemical sensor can realize the simultaneous detection of the trace cadmium and lead ions, and the detection limits are respectively 1.5mug / L and 0.05 mug / L. The preparation method of the working electrode provided by the invention has the advantages that simplicity and environmental protection are realized, the working electrode combines the characteristic that hetero atoms and Nafion can effectively adsorb heavy metal ions, and bismuth and to-be-detected heavy metal can form an alloy, and the sensitivity of sensing heavy metal ions of the glassy carbon electrode is remarkably improved. The electrochemical sensor provided by the invention has the advantages that the reproducibility is good, the antijamming capability is strong, the detection limits are low, and the electrochemical sensor is applied in on-site analysis of cadmium and lead ions.

Description

technical field [0001] The invention relates to the field of electrochemical sensors for trace heavy metal ions, in particular to a nitrogen-doped microporous carbon modified electrode material for trace analysis of cadmium and lead and a Nafion / nitrogen-doped microporous carbon / bismuth film modified glassy carbon electrode method of preparation. Background technique [0002] In recent years, the pollution problem of highly toxic heavy metals (such as cadmium, lead, etc.) has become increasingly serious. Highly toxic heavy metals mainly enter the ecosystem through metal smelting, fossil fuel combustion, mining, and sewage discharge, and then circulate in soil, water, and the atmosphere, and are easily migrated and enriched in organisms through the food chain. Cadmium is not an essential element for the human body. Toxicity can be caused by inhalation of cadmium-contaminated fumes and ingestion of cadmium-contaminated food and water. Cadmium and cadmium compounds have been...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/48
Inventor 袁群惠肖丽丽周生海
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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