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Electrochemical detection method for detecting trace heavy metal ions in water with modified graphene oxide composite modified electrode

A graphene composite and modified electrode technology is applied in the field of analysis and detection to achieve the effects of simple sample processing, easy promotion, and great economic and social benefits

Active Publication Date: 2016-06-29
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the doping of bismuth ions also effectively improves the conductivity of the Nafion membrane. While not destroying the selective permeability of the Nafion membrane, a structural carrier of multi-level pores is constructed to make full use of the ultra-high specific surface area and excellent electrical conductivity of graphene. Overcome the defect of poor conductivity of Nafion film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 1.0ml of graphene oxide aqueous solution (concentration: 2.3mg / mL) into 0.75% Nafion solution (containing bismuth ions with a concentration of 0.5mg / L), mix well and ultrasonically disperse for 30min to form GO-Bi - Nafion suspension. The glassy carbon electrode (diameter 3mm) was successively coated with 0.3, 0.05μm Al 2 o 3 Polish the suede of the slurry to a mirror surface, then ultrasonically clean it in absolute ethanol, dilute nitric acid and secondary water in sequence, and finally rinse it with secondary water. After the surface of the electrode was blown dry with nitrogen, 5 μL of GO-Bi-Nafion suspension was added dropwise to the center of the electrode with a micro-syringe. After the solvent evaporated, the surface of the electrode was rinsed with deionized water and dried in air to obtain GO-Bi-Nafion Composite membrane modified glassy carbon electrode, labeled as GO-Bi-Nafion / GCE.

[0037] Electrochemical determination of mercury, copper, lead, and ca...

Embodiment 2

[0046] Add 1.25ml of graphene oxide aqueous solution (concentration: 2.3mg / mL) into 1.0% Nafion solution (containing bismuth ions with a concentration of 1.0mg / L), mix well and ultrasonically disperse for 30min to form GO-Bi - Nafion suspension. The glassy carbon electrode (diameter 3mm) was successively coated with 0.3, 0.05μm Al 2 o 3 Polish the suede of the slurry to a mirror surface, then ultrasonically clean it in absolute ethanol, dilute nitric acid and secondary water in sequence, and finally rinse it with secondary water. After the surface of the electrode was blown dry with nitrogen, 5 μL of GO-Bi-Nafion suspension was added dropwise to the center of the electrode with a micro-syringe. After the solvent evaporated, the surface of the electrode was rinsed with deionized water and dried in air to obtain GO-Bi-Nafion Composite membrane modified glassy carbon electrode, labeled as GO-Bi-Nafion / GCE.

[0047] Electrochemical determination of mercury, copper, lead, and ca...

Embodiment 3

[0056] Add 1.2ml of graphene oxide aqueous solution (concentration: 2.3mg / mL) into 0.8% Nafion solution (containing bismuth ions with a concentration of 0.75mg / L), mix well and ultrasonically disperse for 30min to form GO-Bi - Nafion suspension. The glassy carbon electrode (diameter 3mm) was successively coated with 0.3, 0.05μm Al 2 o 3 Polish the suede of the slurry to a mirror surface, then ultrasonically clean it in absolute ethanol, dilute nitric acid and secondary water in sequence, and finally rinse it with secondary water. After the surface of the electrode was blown dry with nitrogen, 5 μL of GO-Bi-Nafion suspension was added dropwise to the center of the electrode with a micro-syringe. After the solvent evaporated, the surface of the electrode was rinsed with deionized water and dried in air to obtain GO-Bi-Nafion Composite membrane modified glassy carbon electrode, labeled as GO-Bi-Nafion / GCE.

[0057] Electrochemical determination of mercury, copper, lead, and ca...

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Abstract

The invention provides an electrochemical detection method for detecting trace heavy metal ions in water with a modified graphene oxide composite modified electrode. The method includes the steps that graphene oxide is ultrasonically dispersed into a Nafion solution containing bismuth, and GO-Bi-Nafion suspension is obtained; the polished, cleaned and dried surface of a glassy carbon electrode is uniformly coated with the GO-Bi-Nafion suspension, and a GO-Bi-Nafion / GCE is obtained. The developed graphene oxide material meets the requirements for detection and deep removal of heavy metal ions in water. The electrode material with high electrochemical activity has the advantages that sample treatment is easy, cost is low, the speed is high, and trace heavy metal can be detected when applied to electrochemical transducer rapid determination of heavy metal in water. In addition, the development of the heavy metal water pollution detection and treatment technology in China is promoted by the electrochemical detection method, and the modified graphene oxide composite modified electrode will have great economic and social benefits after industrialization.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and in particular relates to an electrochemical detection method for detecting trace heavy metal ions in a water body by a modified graphene oxide composite modified electrode. Background technique [0002] Electrochemical methods play an important role in the detection of heavy metal ions because of their outstanding low detection limit, low cost, and simple and convenient operation. Anodic stripping voltammetry (ASV) is used to detect the concentration of metals in water, but the choice of electrode material plays an important role in the measurement of trace metal ion content. How to modify the electrode to improve the efficiency of the electrode, so that the detection limit of heavy metal ions is the best, and the repeatability and stability are the best, is a very important research direction for the detection of metal ions. Common electrode materials (such as carbon, gold, etc.) can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/42
CPCG01N27/308G01N27/42
Inventor 刘秀玉黄惠
Owner 山东济清科技服务有限公司
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