Monodispersive bimetal Au/Pt nano-particle modified electrode for detecting mercury in water and preparation method thereof

A bimetallic nanometer and water detection technology, applied in the direction of material electrochemical variables, can solve the problems of cumbersome mechanical grinding and polishing, Au electrode surface pollution, poor reproducibility of experimental results, etc., and achieve good anti-interference ability, high sensitivity, The effect of low detection limit

Inactive Publication Date: 2010-06-23
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, due to the good affinity between Au and Hg, which can effectively promote the pre-concentration of Hg on the surface of the Au electrode, most people used the Au electrode to realize the stripping voltammetry detection of Hg, but because Au and Hg are easy to form Au -Hg is homogeneous, even Hg will diffuse and penetrate into the Au electrode, making the surface of the Au electrode seriously polluted, and the reproducibility of the experimental results is poor
In order to update the surface of the electrode, cumbersome mechanical grinding and polishing are required, which is time-consuming and labor-intensive

Method used

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  • Monodispersive bimetal Au/Pt nano-particle modified electrode for detecting mercury in water and preparation method thereof
  • Monodispersive bimetal Au/Pt nano-particle modified electrode for detecting mercury in water and preparation method thereof
  • Monodispersive bimetal Au/Pt nano-particle modified electrode for detecting mercury in water and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] The glassy carbon electrode is polished with aluminum powder with a particle size of 1.0, 0.3, and 0.05 microns in sequence until the surface of the glassy carbon electrode becomes a mirror surface. The polished glassy carbon electrode is ultrasonically cleaned with anhydrous ethanol and double-distilled water in sequence, and then cleaned with pure nitrogen gas. blow dry. Take 10 microliters of 0.75 mg / LPt(II)-doped organic nanofiber material ethanol suspension and drop it on the center of the above-mentioned glassy carbon electrode, and let it dry naturally. Then place the electrode modified with Pt(II)-doped organic nanofibrous material in a mixed solution containing 0.5mmol / L chloroauric acid and 0.1mol / L potassium chloride, and use cyclic voltammetry to select the potential from 0.2 to -1.0 12 circles of volt scanning were performed to obtain a monodisperse bimetallic Au / Pt nanoparticle composite electrode.

[0024] Insert the electrode into 1mol / L hydrochloric ac...

Embodiment 2

[0026] The glassy carbon electrode is polished with aluminum powder with a particle size of 1.0, 0.3, and 0.05 microns in sequence until the surface of the glassy carbon electrode becomes a mirror surface. The polished glassy carbon electrode is ultrasonically cleaned with anhydrous ethanol and double-distilled water in sequence, and then cleaned with pure nitrogen gas. blow dry. Take 10 microliters of 0.75 mg / LPt(II)-doped organic nanofiber material ethanol suspension and drop it on the center of the above-mentioned glassy carbon electrode, and let it dry naturally. Then place the electrode modified with Pt(II)-doped organic nanofibrous material in a mixed solution containing 0.5mmol / L chloroauric acid and 0.1mol / L potassium chloride, and use cyclic voltammetry to select the potential from 0.2 to -1.0 12 circles of volt scanning were performed to obtain a monodisperse bimetallic Au / Pt nanoparticle composite electrode.

[0027] Take 91.7 milliliters of tap water samples, add ...

Embodiment 3

[0029] The glassy carbon electrode is polished with aluminum powder with a particle size of 1.0, 0.3, and 0.05 microns in sequence until the surface of the glassy carbon electrode becomes a mirror surface. The polished glassy carbon electrode is ultrasonically cleaned with anhydrous ethanol and double-distilled water in sequence, and then cleaned with pure nitrogen gas. blow dry. Take 10 microliters of 0.75 mg / LPt(II)-doped organic nanofiber material ethanol suspension and drop it on the center of the above-mentioned glassy carbon electrode, and let it dry naturally. Afterwards, the electrode modified with Pt(II)-doped organic nanofibrous material is placed in a mixed solution containing 0.5mmol / L chloroauric acid and 0.1mol / L potassium chloride, and the potential is selected from 0.2 to -1.0 by cyclic voltammetry. 12 circles of volt scanning were performed to obtain a monodisperse bimetallic Au / Pt nanoparticle composite electrode.

[0030] The river water was filtered throug...

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Abstract

The invention relates to a monodispersive bimetal Au/Pt nano-particle modified electrode for detecting mercury in water and a preparation method thereof. The preparation method of the electrode comprises the following steps of: adding chloroplatinic acid to 3,3',5,5'-tetramethylbenzidine to obtain a purple precipitate, i.e. a Pt(II) doped organic nano fiber material; modifying the organic nano fiber material containing Pt(II) onto the surface of a glassy carbon electrode and then putting the modified glassy carbon electrode in a chloroauric acid solution; and carrying out electrochemical reduction by adopting cyclic voltammetry, wherein in the reduction process, the chloroauric acid is reduced into simple substance Au, and partial Pt(II) doped in the organic nano fiber material is also reduced into simple substance Pt, thereby forming a glassy carbon electrode which is adhered with Au-Pt bimetal nano particles on the surface and modified by a three-dimensional porous composite membrane with a network-shaped structure by using organic fibrous nano material as a supporting skeleton. The electrode can be used for detecting the content of mercury by adopting anodic stripping voltammetry, and has low detection limit to 0.008ppb, high sensitivity, strong selectivity and convenient and quick operation.

Description

technical field [0001] The invention relates to a modified glassy carbon electrode for detecting mercury in water and a preparation method thereof. In particular, it relates to an electrode with a gold-platinum bimetallic modified Pt(II)-doped organic nanofiber material three-dimensional porous network structure on a glassy carbon electrode and a preparation method thereof. The electrode is used to detect mercury in water by anodic stripping voltammetry. Background technique [0002] Heavy metal mercury is a highly toxic substance, which can accumulate in human and animal bodies, and has mutagenic, teratogenic, and carcinogenic effects. Mercury pollution of water bodies due to human activities, such as: chlor-alkali, plastics, batteries, and wastewater discharged from the electronics industry. It is estimated that from 1970 to 1979, the total amount of mercury discharged directly to water bodies due to human activities in the world was about 16,000 tons; discharged to the at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 龚静鸣周婷
Owner HUAZHONG NORMAL UNIV
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