Graphene-graphene oxide nano-composite material modified electrode and method for measuring concentrations of catechol and hydroquinone simultaneously

A technology of nanocomposite materials and modified electrodes, which is applied in chemical instruments and methods, graphene, material electrochemical variables, etc., can solve the problems of graphene research and application difficulties, easy aggregation, weak interaction, etc., and achieves easy electrode fabrication. , the effect of good selectivity and high sensitivity

Inactive Publication Date: 2013-09-25
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The interaction with other solvents is weak, and there is a strong van der Waals force between graphene sheets

Method used

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  • Graphene-graphene oxide nano-composite material modified electrode and method for measuring concentrations of catechol and hydroquinone simultaneously
  • Graphene-graphene oxide nano-composite material modified electrode and method for measuring concentrations of catechol and hydroquinone simultaneously
  • Graphene-graphene oxide nano-composite material modified electrode and method for measuring concentrations of catechol and hydroquinone simultaneously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) The preparation process of graphene oxide: put 2g graphite powder into a 250mL beaker, add 1g NaNO 3 and 46mL 98%H 2 SO 4 Then stir well in an ice-water bath. Slowly add 6 g of potassium permanganate to the above solution, keep the temperature of the whole system at 20° C. and stir for 5 minutes. Then remove the ice-water bath, heat to 35°C, and stir for 30 minutes. Then add 92mL of secondary water, heat to boiling (98°C) and stir for 15 minutes, then add 80mL of 3% hydrogen peroxide (the solution should be close to brown at this time, indicating that the graphite is oxidized). The above solution was centrifuged at 7200 rpm for 30 minutes. The centrifuged powder was washed sequentially with 5% HCl and secondary water until the upper suspension was approximately neutral. The powder obtained from the above washing was redispersed in water and ultrasonicated for 30 minutes (ultrasonic exfoliation). After vacuum filtering the black residue, the filtrate is a unifo...

Embodiment 2

[0051] Embodiment 2: the influence of graphene and graphite oxide addition amount on modified electrode

[0052] 1. Handling of electrodes

[0053] The glassy carbon electrode was first treated with 0.3 μm aluminum oxide suspension on the polishing cloth, then polished to a mirror surface with 0.05 μm aluminum oxide suspension on the polishing cloth, and finally ultrasonicated with ethanol and secondary water Clean and blow dry with high-purity nitrogen;

[0054] 2. Preparation of different modified electrodes:

[0055] 5 μL of graphene-graphene oxide nanocomposites with a mass ratio of graphene to graphene oxide of 0.5:1, 1:1, 2:1, 2.5:1, and 3:1 were drop-coated on the cleaned electrode surface, Allow to air dry naturally.

[0056] 3. Determination of catechol and hydroquinone:

[0057] Use a micropipette to accurately transfer a certain amount of catechol (CC) and hydroquinone (HQ) solutions into the phosphate buffer electrolytic cell containing 4mL pH 7.0, and use 2 ...

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Abstract

The invention discloses a preparation method of a graphene-graphene oxide nano-composite material modified electrode, which comprises the following steps of: a, preparing a graphene-graphene oxide nano-composite material; b, processing the electrode; and c, preparing a GR-GO modified electrode (GR-GO/GCE). According to the preparation method of the graphene-graphene oxide nano-composite material modified electrode provided by the invention, graphene is dispersed well, therefore, good performances of graphene are ensured; the material is simple and convenient to synthesize; and preparation of the electrode is simpler, more convenient and free from toxicity and environmental pollution.

Description

technical field [0001] The invention relates to a method for modifying an electrode by using a nanocomposite material and using it to simultaneously measure catechol and hydroquinone isomers, belonging to the technical field of chemical isomer analysis and determination. Background technique [0002] Hydroquinone is an important industrial raw material and intermediate, widely used in photographic, dyestuff, cosmetic, chemical and pharmaceutical industries. The U.S. Environmental Protection Agency considers catechol and hydroquinone to be significant toxic environmental pollutants. Catechol and hydroquinone have similar chemical and physical properties, they co-exist in the environment and interfere with each other when measured. Therefore, it is of great significance to develop a method for the simultaneous determination of the two isomers of hydroquinone and catechol. At present, gas chromatography analysis methods, fluorescence photometry, absorbance ratio derivative me...

Claims

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Application Information

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IPC IPC(8): G01N27/30C01B31/04G01N27/26C01B32/182C01B32/198
Inventor 周喜斌何志芳连茜雯卢小泉
Owner NORTHWEST NORMAL UNIVERSITY
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