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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However, these detection techniques require complex equi

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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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[0026] Example

[0027] 1. Put 10 mg of the prepared 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 mixture into a polytetrafluoroethylene reactor for hydrothermal reaction at 120 ℃ for 12 h; after centrifugation, the obtained material was washed with deionized water, ethanol and then centrifuged three times in sequence, and finally in a freeze dryer After drying, the graphene / polypyrrole nanocomposite (GR / PPy) is obtained. Take 10 mg of GR / PPy composite material in 10 mL of distilled water to form a uniform dispersion, scan ten cycles by cyclic voltammetry (cyclic potential: -1.3 V~1 V, scan rate: 0.025 V / s) to obtain graphene / Polypyrrole modified carbon electrode (GR / PPy / CE). Take the above-mentioned GR / PPy / CE as the working electrode, put it in 25 mL of ethanol, add 0.05 g of nonylphenol and 5.0 mmol of dopamine to mix well. Us...

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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 ...

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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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