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Method for detecting trace hydroquinone by using graphene/carbon nano tube modified electrode

A technology of carbon nanotubes and hydroquinone, applied in the field of rapid detection of trace hydroquinone in water, can solve the problems of low resistivity, large specific surface area, etc., achieve simple detection, improve sensitivity and selectivity

Inactive Publication Date: 2013-12-11
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Graphene / carbon nanotube composite material is a new type of composite material, which has excellent electrical conductivity, low resistivity, and large specific surface area. It is a material with energy storage capacity and is widely used in batteries, Among capacitor materials, there is no report on its application in sensing

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  • Method for detecting trace hydroquinone by using graphene/carbon nano tube modified electrode
  • Method for detecting trace hydroquinone by using graphene/carbon nano tube modified electrode

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Embodiment Construction

[0023] 1. Treatment of glassy carbon electrodes:

[0024] The surface of the commercially available glassy carbon electrode was sequentially polished with alumina powder of 1.0 μm, 0.3 μm and 0.05 μm in particle size, and then ultrasonically washed in 50% nitric acid, absolute ethanol and secondary water for 10 minute.

[0025] 2. Oxidation of carbon nanotubes:

[0026] Add 30 mg single-walled carbon nanotubes and 20 mL of HNO at a concentration of 6 mol / L to a round bottom flask 3 , reacted in a water bath at 65°C for 20 hours, then filtered with suction, washed with NaOH and secondary water in sequence until the pH of the solution was 7, and oxidized carbon nanotubes (black solid) were obtained.

[0027] 3. Preparation of graphene / carbon nanotube composite nanomaterials:

[0028] The oxidized carbon nanotubes, graphene and NaBH obtained in step (2) were sequentially 4 Add it into a three-necked flask filled with 50 mL of absolute ethanol, disperse it uniformly by ultraso...

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Abstract

The invention discloses a method for detecting trace hydroquinone by using a graphene / carbon nano tube modified electrode. The graphene / carbon nano tube modified electrode is a working electrode, and a method for detecting trace hydroquinone in water is established by means of different current catalytic strengths of the graphene / carbon nano tube modified electrode to hydroquinone with the concentration of respectively 0.6mu mol / L, 0.8mu mol / L, 2mu mol / L, 4mu mol / L, 6mu mol / L, 8mu mol / L, 20mu mol / L, 40mu mol / L and 60mu mol / L. The scanning potential is -0.2-0.6V, and the scanning speed is 100mV / s. In a 0.02mol / L phosphate buffered solution (PBS) with a pH value of 7.4, the concentration of the hydroquinone is within the range of 6*10<-7>-6*10<-5>mol / L, a favorable linear relation is formed between the concentration and the catalytic current strength on the surface of the electrode, and the detection limit is 2.13*10<-7>mol / L. The method is sensitive, good in selectivity, and more convenient and simpler in detection of low-concentration hydroquinone.

Description

technical field [0001] The invention relates to a method for rapidly detecting trace hydroquinone in water by using a graphene / carbon nanotube modified electrode with high sensitivity. Background technique [0002] Hydroquinone is often used as an important intermediate and exists in the manufacturing processes of pesticides, paints, drugs, and imaging. The resulting waste water, waste, and waste residues have caused great harm to the environment. The skin and mucous membranes have a strong corrosive effect, which can inhibit the central nervous system or damage the liver and skin functions. Hydroquinone in water can also affect the growth of aquatic organisms. The US EPA has also formulated a detection standard for hydroquinone. Therefore, it is necessary to improve the sensitivity on the existing basis to study a hydroquinone. A detection method with high sensitivity. Graphene / carbon nanotube composite material is a new type of composite material, which has excellent ele...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 张学洪郑君健刘杰
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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