Electrochemical sensor for sensitively detecting heavy metal cadmium ions and preparation method of electrochemical sensor

A technology for sensitive detection of cadmium ions, applied in the field of trace heavy metal electrochemical sensors, can solve the problems of complex operation of equipment, real-time online detection of heavy metal cadmium ions, long time consumption of sample preparation, narrow detection linear range, etc., to improve electrocatalytic performance , Conducive to the effect of enrichment and detection with a wide linear range

Inactive Publication Date: 2018-07-24
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Problems and defects of the prior art: although the methods mentioned above have better selectivity and higher sensitivity, the equipment required by these methods is expensive, the equipment is bulky, unfavorable for carrying, and the preparation of samples consumes a long time, The operation of the equipment is complicated, professional testing is required, and it cannot be applied to real-time online detection of heavy metal cadmium ions
However, the detection linear range is narrow, and its practical application is limited

Method used

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  • Electrochemical sensor for sensitively detecting heavy metal cadmium ions and preparation method of electrochemical sensor
  • Electrochemical sensor for sensitively detecting heavy metal cadmium ions and preparation method of electrochemical sensor
  • Electrochemical sensor for sensitively detecting heavy metal cadmium ions and preparation method of electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of a glassy carbon electrode modified with nitrogen and sulfur co-doped graphite porous carbon / Nafion / bismuth film

[0037] Preparation of Nitrogen and Sulfur Co-doped Graphite Porous Carbon

[0038] Mix 7.5 ml of ammonia water, 14 ml of deionized water and 300 ml of ethanol together, stir at room temperature for 30 minutes, and then slowly add a solution containing 15 ml of ethanol and 15 ml of ethyl orthosilicate to The above mixed solution. The resulting mixed solution is stirred for 6 hours to prepare uniform silica microspheres. 7.5 g of p-this diamine and 15 ml of sulfuric acid were added to the above colloidal solution and reacted for a further 36 hours. Subsequently, the final powdery substance can be obtained by centrifugation, drying at 80°C, and carbonization at 900°C in an air atmosphere. Finally, by soaking the above powder with hydrofluoric acid to remove the silica template, the nitrogen-sulfur co-doped graphite porous carbon can be obtained.

[...

Embodiment 2

[0044] Optimization of the concentration of nitrogen and sulfur co-doped graphite porous carbon dispersion.

[0045] Example 1 was repeated, and the glassy carbon electrode was modified with the modification solution obtained in Example 1 with a concentration of 0, 1, 2, and 3 mg / mL. The electrode peak current first increases and then decreases with the increase of the concentration of the modification solution. The optimal concentration of the modification solution is 1 mg / mL.

Embodiment 3

[0047] Optimization of Nafion quality score.

[0048] Repeat Example 2, and the mass fractions of Nafion used were 0, 0.1, 0.2 wt.%, respectively. When the mass fraction of Nafion increases from 0 to 0.1 wt.%, the peak current increases, but when the mass fraction of Nafion is further increased, the current decreases. The optimal mass fraction of Nafion is 0.1wt.%.

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Abstract

The invention aims at providing an electrochemical sensor for sensitively detecting heavy metal cadmium ions and a preparation method of the electrochemical sensor. The structure of the sensor is formed by an electrochemical workstation, an electrolytic cell and electrodes; the electrodes include a platinum wire counter electrode, a silver / silver chloride reference electrode and a working electrode, wherein the working electrode refers to a glassy carbon electrode adopting nitrogen-sulfur codoping and graphite porous carbon / Nafion / bismuth film modification. The electrochemical sensor can realize sensitive detection of trace heavy metal cadmium ions, the detection linear range is 4-80 micrograms / L, and the detection limit reaches 0.1 microgram / L. By combining with good properties of a bismuth film, a Nafion film and a nitrogen-sulfur codoped porous carbon material, the electrochemical sensor has the performances of high sensitivity, good selectivity, wide linear range, good reproducibility, good stability and the like and can be applied to detecting the heavy metal cadmium ions in an actual water sample.

Description

Technical field [0001] The invention relates to the field of trace heavy metal electrochemical sensors, in particular to an electrochemical sensor for sensitive detection of heavy metal cadmium ions for trace analysis of cadmium ions and a preparation method thereof, including a nitrogen-sulfur co-doped graphite porous carbon modification Electrode material and preparation method of Nafion / nitrogen-sulfur co-doped graphite porous carbon / bismuth film modified glassy carbon electrode. Background technique [0002] Heavy metal cadmium ions will flow into the natural environment through sewage irrigation, industrial wastewater and domestic sewage discharge and accumulate in the environment. In addition, heavy metal cadmium ions are difficult to be degraded and are easily enriched in the human body through the food chain. Even at very low concentrations, heavy metal cadmium ions are highly toxic and can cause chronic and acute serious diseases to the human body. Therefore, heavy metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 袁群惠吴淑程干为吴星星王敬敏
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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