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High-sensitivity phenol electrochemical sensor and preparation method thereof

A sensitive phenolic sensor technology, applied in the field of high-sensitivity phenolic electrochemical sensors and its preparation, can solve the problems of numerous steps, low detection sensitivity, cumbersome operation, etc., and achieve the effects of accelerated response time, high detection sensitivity, and simple operation

Inactive Publication Date: 2016-08-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a high-sensitivity phenolic electrochemical sensor and its preparation method for the deficiencies in the prior art such as cumbersome operation, numerous steps, and low detection sensitivity

Method used

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  • High-sensitivity phenol electrochemical sensor and preparation method thereof
  • High-sensitivity phenol electrochemical sensor and preparation method thereof
  • High-sensitivity phenol electrochemical sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The first step is the preparation of a 3D graphene conductive network bridged by multi-walled carbon nanotubes;

[0042] At 80 °C, 20 g of natural graphite was preoxidized with 30 mL of concentrated sulfuric acid, 10 g of potassium persulfate and 10 g of phosphorus pentoxide, washed with water to pH = 7, and dried overnight at room temperature for use; 460 mL of concentrated sulfuric acid was cooled to 0 ℃, then add 20 g of pre-oxidized graphite into it, slowly add 60 g of potassium permanganate, so that the system temperature does not exceed 20 ℃, after the addition is completed, the temperature is raised to 35 ℃, after stirring for 2 h, and batch Slowly add 920 mL of deionized water so that the temperature of the system does not exceed 98 °C. After stirring for another 15 minutes, add 2.8 L of deionized water and 50 mL of 30% hydrogen peroxide. The resulting bright yellow suspension was filtered under reduced pressure and washed. Until there is no sulfate ion in the ...

Embodiment 2

[0052] The first step is the same as step one in Example 1;

[0053] In the second step, ultrasonically disperse 2 mg of the product of the first step in a blend solvent of water and perfluorosulfonic acid-polytetrafluoroethylene copolymer, the concentration of Nafion is 0.5 wt%, in the blend solvent, two The volume ratio of the solvent is 1:1; the ratio of the active material to the solvent is 1:5 mg / mL; the ultrasonic time is 1 h.

[0054] Steps 3 to 6 are the same as Steps 3 to 6 in Example 1.

Embodiment 3

[0056] The first step is the same as step one in Example 1;

[0057] In the second step, ultrasonically disperse 2 mg of the product of the first step in a blend solvent of water and perfluorosulfonic acid-polytetrafluoroethylene copolymer, the concentration of Nafion is 0.5 wt%, and the volume ratio of the two solvents is 5 : 1; the ratio of active material to solvent is 5:1 mg / mL; the ultrasonic time is 5 h.

[0058] Steps 3 to 6 are the same as Steps 3 to 6 in Example 1.

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Abstract

The invention discloses a high-sensitivity phenol electrochemical sensor and a preparation method thereof. The preparation method comprises the following steps: subjecting a prepared multi-walled carbon nanotube-bridged 3D graphene conductive network to ultrasonic dispersion in water, dispensing an obtained solution on a polished glassy carbon electrode and carrying out drying so as to obtain the sensor. The nanometer sensor prepared from a 3D functionalized nano-material can realize electrochemical detection of p-aminophenol, p-chlorophenol, p-nitrophenol and the like in a complex environment containing other interference substances, and effectively overcomes the defect that CDs are easy to shed; non-covalent bridging of carboxylated carbon nanotubes substantially improves conductivity of the system and selectivity of CDs; and the method is higher in economic performance, better in feasibility and higher in sensitivity.

Description

technical field [0001] The invention relates to a high-sensitivity phenolic electrochemical sensor and a preparation method thereof, in particular to a sensor with p-aminophenol (4-AP), p-chlorophenol (4-CP) and p-nitrophenol (4-NP) Electrochemical sensor with isoelectrochemically enhanced response and preparation method thereof. Background technique [0002] Phenolic compounds are very important chemical raw materials and by-products in the chemical industry. They are widely used in industrial products and can accumulate in the environment or in ecological food chains through consumption by wildlife or ingestion by plants. These compounds are highly toxic and difficult to be biotic and abiotic degraded, therefore, they pose significant toxicity risks to the environment and human health. In particular, p-aminophenol (4-AP), p-chlorophenol (4-CP) and p-nitrophenol (4-NP) compounds are among the main pollutants, monitored by international agencies such as the US Environmenta...

Claims

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Application Information

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IPC IPC(8): G01N27/26B82Y15/00B82Y30/00B82Y40/00
CPCG01N27/26B82Y15/00B82Y30/00B82Y40/00
Inventor 张树鹏高娟娟宋海欧刘茂祥钱悦月
Owner NANJING UNIV OF SCI & TECH
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