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Preparation method of graphene/polypyrrole-nano-composite-material-modified molecular imprinting sensor for nonylphenol detection and application

A composite material and pyrrole nanotechnology, which is applied in the field of electroanalytical chemistry and material synthesis, can solve the problems of time-consuming extraction process and complex instruments and equipment, and achieve the effects of ensuring sensitivity and selectivity, uniform and controllable thickness, and stable modified materials

Pending Publication Date: 2020-02-14
JILIN NORMAL UNIV
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Problems solved by technology

However, these detection techniques require complex instruments and relatively time-consuming extraction processes.

Method used

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  • Preparation method of graphene/polypyrrole-nano-composite-material-modified molecular imprinting sensor for nonylphenol detection and application
  • Preparation method of graphene/polypyrrole-nano-composite-material-modified molecular imprinting sensor for nonylphenol detection and application
  • Preparation method of graphene/polypyrrole-nano-composite-material-modified molecular imprinting sensor for nonylphenol detection and application

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Embodiment

[0027]1. Put the prepared 10 mg graphene oxide (GO) into 15 mL of deionized water, sonicate for 1 h to mix the GO dispersion evenly; put 1 mL of pyrrole monomer (Py) in an ice-water bath, and stir vigorously 2 h; put the above mixed solution in a polytetrafluoroethylene reactor for hydrothermal reaction at 120 °C for 12 h; after centrifugation, the obtained material was washed with deionized water and ethanol three times in sequence, and finally dried in a freeze dryer. After drying, the graphene / polypyrrole nanocomposite material (GR / PPy) is obtained. Take 10 mg GR / PPy composite material in 10 mL distilled water to form a uniform dispersion, and scan ten times by cyclic voltammetry (cycle potential: -1.3 V~1 V, scan rate: 0.025 V / s) to obtain graphene / polypyrrole modified carbon electrode (GR / PPy / CE). Using the above-mentioned GR / PPy / CE as the working electrode, put it into 25 mL of ethanol, add 0.05 g of nonylphenol and 5.0 mmol of dopamine and mix well. GR / PPy modified n...

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Abstract

The invention relates to a preparation method of a graphene / polypyrrole-nano-composite-material-modified molecular imprinting sensor for nonylphenol detection. According to the invention, a novel molecularly imprinted electrochemical sensor for determining nonylphenol is constructed based on a graphene (GR) / polypyrrole (PPy) nano composite material using dopamine as a functional monomer. The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) electrochemical test results show that the GR / PPy-modified molecularly imprinting sensor has good specific recognition ability and high selectivity and sensitivity to 4-NP. The response current (delta I) and the negative logarithm (-lgC) of the concentration of nonylphenol in the range of 2.0*10 <-5>to -8.0*10<10>molL<-1> are in a good linear relationship; and the detection limit of the imprinting sensor is 2.75*10<-11>mol / L(S / N=3). With the electrochemical imprinting sensor, the effective detection of nonylphenol in a water body is realized and the recovery rate is 92% to 103%.

Description

technical field [0001] The invention belongs to the technical field of electroanalytical chemistry and material synthesis, and in particular relates to a preparation method and application of a molecularly imprinted sensor modified by graphene / polypyrrole nanocomposite materials for nonylphenol detection. Background technique [0002] Nonylphenol (4-NP) widely exists in the media used in the manufacturing industry, such as lubricating oil additives, antioxidants, etc., and nonylphenol is also a non-ionic alkylphenol polyoxyethylene ether surfactant degradation product of. Nonylphenol has also been detected in food packaging films, plastics that come into contact with food, toys and food. Nonylphenol has strong toxicity and can seriously pollute the environment and natural ecology. As an endocrine disruptor, when the concentration in the environment reaches 10 -6 Sometimes, it can interfere with the reproductive system of fish, reptiles and mammals, and cause serious harm ...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48B82Y40/00B82Y15/00
CPCG01N27/308G01N27/48B82Y40/00B82Y15/00
Inventor 王继库谢超洪国辉赵芳薇
Owner JILIN NORMAL UNIV
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