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Preparation method of nano-material modified electrode and method for determining phenolic compounds in water body

A technology of phenolic compounds and nanomaterials, applied in the fields of material electrochemical variables, nanotechnology, analytical materials, etc., can solve the problems of insufficient portability and time-consuming instruments, and achieve the effect of improving accuracy and reducing system errors.

Active Publication Date: 2020-04-10
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods are sensitive and selective, they are time consuming, require expensive instrumentation and are not portable
Recently, Yuan et al. demonstrated that phenolic compounds such as hydroquinone, resorcinol, and p-cresol could be detected using graphene / multi-walled carbon nanotubes / gold nanocluster hybrid materials based on the principle of electrochemiluminescence. , both p-chlorophenol and o-bromophenol have good effects, but only several phenolic compounds can be detected separately, and this method cannot be applied to the simultaneous detection and differentiation of these phenolic compounds

Method used

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  • Preparation method of nano-material modified electrode and method for determining phenolic compounds in water body
  • Preparation method of nano-material modified electrode and method for determining phenolic compounds in water body
  • Preparation method of nano-material modified electrode and method for determining phenolic compounds in water body

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preparation example Construction

[0028] (1) Preparation of nano-hybrid materials: under magnetic stirring, add 10 mg to 20 mg of Ce(NO 3 ) 3 ·6H 2 O, then add 2mL-3mL ammonia water dropwise to the mixed solution, then transfer the mixed solution to a polytetrafluoroethylene reactor, and react at 150°C-200°C for 6h-8h. The reacted product is obtained after being centrifuged by a centrifuge with a rotating speed of 10000rpm-12000rpm for 30min-45min and washed several times with distilled water and ethanol. The finally obtained product is dried in a vacuum oven at room temperature to obtain a graphene oxide / cerium oxide nano-hybrid material, which is ready for use.

[0029] (2) Construction of electrochemical sensor: graphene oxide / cerium oxide (GO / CeO 2 ) The nano-hybrid material is dispersed in the perfluorosulfonic acid aqueous solution in the ultrasonic wave, and the final concentration is 2.0 mg·mL -1 ~3.0mg·mL -1 . Then the resulting GO / CeO 2 The nano-hybrid material was ultrasonically dispersed for...

Embodiment 1

[0034] Embodiment 1: the preparation of nano-hybrid material

[0035] Preparation of nano-hybrid materials: Add 20mg Ce(NO 3 ) 3 ·6H 2 O, and then 2 mL of ammonia water was added dropwise to the mixed solution, and then the mixed solution was transferred to a 150 mL polytetrafluoroethylene reactor, and reacted at 180° C. for 8 h. The reacted product was obtained by centrifuging at 12000 rpm for 45 min and washing with distilled water and ethanol several times. The finally obtained product was dried in a vacuum drying oven at room temperature and was ready for use.

Embodiment 2

[0036] Embodiment 2: Construction of electrochemical sensor

[0037] GO / CeO 2 The nano-hybrid material was dispersed in an aqueous solution of perfluorosulfonic acid with a mass concentration of 0.05% in ultrasonic waves, and the final concentration was 3.0 mg·mL -1 . The resulting graphene oxide / cerium oxide (GO / CeO 2 ) 20 mL of the nano-hybrid material was ultrasonically dispersed for 30 min to obtain a nano-composite mixture, and then two 10 mL portions were taken for standing.

[0038] A portion of 10mL was allowed to stand for 2 hours, then pipette 2.5mL each time from top to bottom into 5mL centrifuge tubes, and transferred to four 5mL centrifuge tubes in total, and then pipette 2μL from each centrifuge tube Different layers of nanocomposite mixed solution were drip-coated on the surface of the screen-printed electrode, and dried to prepare four nanomaterial-modified electrodes. The electrode prepared by taking the top 2.5mL was recorded as an electrode that was left ...

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Abstract

The invention discloses a preparation method of a nano-material modified electrode and a method for determining phenolic compounds in a water body. The preparation method comprises the following steps: dispersing a graphene oxide / cerium oxide nano hybrid material in a perfluorosulfonic acid aqueous solution in ultrasonic waves, performing ultrasonic dispersion, dropwise coating the surface of a screen-printed electrode with the obtained product, and drying the screen-printed electrode to obtain a nano material modified electrode, so that synchronous and rapid detection of catechol, p-cresol and p-nitrophenol can be realized. The nano hybrid material modified electrode can quantitatively detect catechol, p-methylphenol and p-nitrophenol at the same time, the linearity is good, and the detection limit can be as low as 10 <-6 > mol / L. The electrochemical sensor constructed by the modified electrode and the detection method does not need an intermediate medium, and shows extremely high sensitivity and excellent reproducibility and stability when detecting the phenolic compounds at the same time.

Description

technical field [0001] The invention relates to a preparation method of a nano-material modified electrode and a method for measuring phenolic compounds in water, belonging to the technical field of rapid detection. Background technique [0002] Phenolic compounds are widely used in industrial products, and they can be enriched and accumulated in the environment and biological chain through ingestion by wild animals and plants. Due to their widespread presence in water, air and food matrices, they pose significant toxicity risks to the environment and human health. Phenolic compounds exhibit varying toxicity, so their detection and quantification is particularly important for assessing the overall toxicity of environmental samples. In particular, catechol, p-cresol and p-nitrophenol are three phenolic compounds listed as priority pollutants by the US Environmental Protection Agency and the European Union. Of course, these phenolic compounds are of great importance in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48B82Y15/00B82Y30/00B82Y40/00
CPCG01N27/308G01N27/48B82Y15/00B82Y30/00B82Y40/00Y02A20/20
Inventor 钱晓磊杨永忠白雷李智敏侯博任映坤
Owner SHAANXI COAL & CHEM TECH INST
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