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Molecularly imprinted electrochemical sensor for selective recognition of p-nitrophenol and its application

A technology of p-nitrophenol and molecular imprinting, applied in the direction of material electrochemical variables, etc., can solve problems such as poor hydrophilicity, high detection limit, complicated preparation process, etc., and achieve improved sensitivity, good water solubility, and excellent electrical conductivity. Effect

Active Publication Date: 2022-03-25
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molecularly imprinted electrochemical sensor that selectively recognizes p-nitrophenol. This molecularly imprinted electrochemical sensor that selectively recognizes p-nitrophenol is used to solve the complex preparation process faced by current molecularly imprinted electrochemical sensors. , poor hydrophilicity and high detection limit, another object of the present invention is to provide the application of this molecularly imprinted electrochemical sensor for selective recognition of p-nitrophenol

Method used

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  • Molecularly imprinted electrochemical sensor for selective recognition of p-nitrophenol and its application
  • Molecularly imprinted electrochemical sensor for selective recognition of p-nitrophenol and its application
  • Molecularly imprinted electrochemical sensor for selective recognition of p-nitrophenol and its application

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Embodiment 1

[0023] This molecularly imprinted electrochemical sensor that selectively recognizes p-nitrophenol uses foamed nickel as the substrate, and the sulfuric acid solution of aniline and p-nitrophenol is used as the electrolyte. Yes, the details are as follows:

[0024] Step 1: Sonicate the cut nickel foam with acetone, ethanol, and deionized water for 30 min, and then dry it at 60°C for use.

[0025] Step 2: 0.05 mol / L p-nitrophenol was used as a template molecule, and 0.05 mol / L aniline was used as a functional monomer, fully dissolved in 0.5 mol / L sulfuric acid solution.

[0026] Step 3: Put nickel foam in the solution prepared in step 2, and conduct electropolymerization using a three-electrode system with a voltage range of -0.5 to 1.2 V, a scan rate of 50 mV / s, and a scan period of 15 cycles.

[0027] Step 4: Place the foamed nickel electrode prepared in step 3 in a Soxhlet extractor for 3 h, and use a mixed solution of methanol and acetic acid with a volume ratio of 9:1 as ...

Embodiment 2

[0030] The difference between this embodiment and specific embodiment 1 is: the concentration of aniline in step 2 is 0.1 mol / L. Other steps are identical with specific embodiment 1. The current value at the peak is 0.39 mA.

Embodiment 3

[0032] The difference between this embodiment and specific embodiment 1 is: the concentration of aniline in step 2 is 0.15 mol / L. Other steps are identical with specific embodiment 1. The current value at the peak is 0.71 mA.

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Abstract

The present invention relates to a molecularly imprinted electrochemical sensor for selective recognition of p-nitrophenol and its application. It uses nickel foam as a substrate, and the sulfuric acid solution of aniline and p-nitrophenol as an electrolyte. Surface polymerization to form molecularly imprinted polymers, the detection limit of p-nitrophenol is 1×10 ‑9 mol / L, the linear range is 2.5×10 ‑6 ~1×10 ‑7 mol / L, its specific preparation method comprises the following steps: one, the foamed nickel electrode that cuts is made into foamed nickel electrode; Two, functional monomer and template molecule are dissolved in acidic aqueous solution, mix uniformly, and functional monomer is aniline, The template molecule is p-nitrophenol; 3. The mixed solution in step 2 is used as an electrolyte solution, and then the nickel foam electrode is placed in the mixed solution, and electrochemically polymerized under the action of an electric field. The molecular imprint prepared by the invention has good water solubility and high sensitivity.

Description

Technical field: [0001] The invention relates to the field of electrochemical sensors, in particular to molecularly imprinted electrochemical sensors for selectively recognizing p-nitrophenol and applications thereof. Background technique: [0002] With the rapid development of society and the continuous expansion of pharmaceutical and chemical industries, the demand for p-nitrophenol, an intermediate in the production of pharmaceutical and fine chemical products, is increasing, but it is accompanied by a large amount of p-nitrophenol Wastewater is discharged into the ecological environment, resulting in the pollution of surface water and groundwater, and the destruction of the ecological environment. p-Nitrophenol has a wide range of uses and is extremely rich in sources, but it is difficult to be biodegraded due to the para-nitro and hydroxyl groups in its molecular structure can be conjugated with the benzene ring, and the nitrophenol produced after partial degradation A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 刘先军刘鹏于忠军刘畅王艺帆陈辉
Owner NORTHEAST GASOLINEEUM UNIV
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