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Electrochemical reduction-oxidation graphene modified electrode and application thereof in detection of heavy metal sexivalent chromium ions in water thereof

A technology for modifying electrodes and graphene, which is applied in the direction of material electrochemical variables, measuring devices, scientific instruments, etc., can solve the problems that graphene is difficult to control the shape, is not suitable for macro-scale preparation, complex process, etc., and achieves improved repeatability The effect of high sensitivity and sensitivity, simple and convenient electrode preparation process, and high electrochemical activity

Inactive Publication Date: 2018-11-02
BEIJING INFORMATION SCI & TECH UNIV
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  • Claims
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Problems solved by technology

The synthesis and preparation methods of graphene mainly include mechanical exfoliation method, epitaxial growth method, chemical vapor phase deposition method, chemical exfoliation method, chemical synthesis method, etc. These methods not only require complicated process and expensive cost, but also produce graphene Difficult to control morphology, poor stability, not suitable for macro preparation

Method used

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  • Electrochemical reduction-oxidation graphene modified electrode and application thereof in detection of heavy metal sexivalent chromium ions in water thereof
  • Electrochemical reduction-oxidation graphene modified electrode and application thereof in detection of heavy metal sexivalent chromium ions in water thereof
  • Electrochemical reduction-oxidation graphene modified electrode and application thereof in detection of heavy metal sexivalent chromium ions in water thereof

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preparation example Construction

[0040]The present invention provides a kind of preparation method of graphene modified electrode on the one hand, it comprises the following steps:

[0041] 1) Prepare pretreatment

[0042] gold electrode with Al 2 o 3 The powdered suede is polished, and the trajectory is "8"; after polishing, ultrasonic treatment is performed in acetone, ethanol, and deionized water for 5 minutes, and then rinsed with ultrapure water; after drying the electrode, place the electrode in 0.1mol / LH 2 SO 4 The electrolytic solution was scanned by cyclic voltammetry and set between 0V and 0.6V for 12 circles to activate the electrode surface.

[0043] Prepare a graphene oxide suspension, add 3.0 mg / mL graphene oxide into a 0.1 mol / L lithium perchlorate solution, and perform ultrasonic treatment for 2 hours to obtain a dark brown suspension.

[0044] 2) Fabrication of graphene-modified electrodes

[0045] Using the electrodeposition method, the gold electrode is used as the working electrode,...

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Abstract

The invention relates to an electrochemical reduction-oxidation graphene modified electrode and application thereof in detection of heavy metal sexivalent chromium ions in water thereof. The modifiedelectrode is prepared by directly depositing electrochemical reduction-oxidation graphene on the surface of a working electrode. The sexivalent chromium ions are detected by using chronoamperometry, linear sweep voltammetry or cyclic voltammetry, the graphene modified electrode serves as a working electrode, an Ag / AgCl electrode serves as a reference electrode, a platinum electrode serves as the counter electrode, and experimental parameter setting is detected. The graphene modified gold electrode serves as the working electrode, the electrode preparation process is simple and convenient, andthe prepared electrode has high electrochemical activity, is capable of realizing rapid detection Cr (VI), wide in detection range (5-2000ug / L) and low in lower limit of detection (0.5 ug / L), has theadvantages of resistance to interference of other metal ions, stability, short detection cycle and the like, and is expected to be applied to actual portable detection application in future.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, and relates to an electrochemically reduced graphene oxide modified electrode and its application in detecting heavy metal hexavalent chromium Cr(VI) ions in water. electrochemical sensors. Background technique [0002] Heavy metal chromium is widely used in electroplating, metallurgy, tanning, dyeing, pigment and other industries in modern industry. The chromium contained in the factory's wastewater and exhaust emissions has polluted the environment and is one of the must-test items for environmental monitoring. Common valence states of chromium include trivalent chromium Cr(III) and hexavalent chromium Cr(VI). The toxicity of hexavalent chromium is 100-1000 times higher than that of trivalent chromium. Hexavalent chromium is easily absorbed by the human body, accumulates in the body, and inhibits Enzyme activity interferes with the synthesis of proteins and ribonucleic acids, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 胡敬芳李玥琪高国伟
Owner BEIJING INFORMATION SCI & TECH UNIV
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