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Electrochemical sensor based on carbon nanotube and preparation method and application thereof

A carbon nanotube and multi-walled carbon nanotube technology, which is applied in the fields of environmental analysis and electroanalytical chemistry, can solve the problems of simultaneous analysis and detection of bisphenol A and bisphenol S, etc., and achieve ultra-high specific selectivity, reducing The effect of low matrix interference, efficient analysis

Inactive Publication Date: 2019-01-04
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this type of sensor has been widely used in the analysis and detection of bisphenol A, but it is rarely used in the analysis and detection of bisphenol S, and there are no relevant reports on the simultaneous analysis and detection of bisphenol A and bisphenol S

Method used

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  • Electrochemical sensor based on carbon nanotube and preparation method and application thereof
  • Electrochemical sensor based on carbon nanotube and preparation method and application thereof
  • Electrochemical sensor based on carbon nanotube and preparation method and application thereof

Examples

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preparation example Construction

[0026] The invention describes a method for preparing an electrochemical sensor based on carbon nanotubes, which is characterized in that: it comprises the following steps:

[0027] (1) Dissolving 0.5-4mg of multi-walled carbon nanotube MWCNTs powder in 0.5-4mL of N,N-dimethylformamide, ultrasonic treatment for 0.5-4h, to form a uniform suspension;

[0028] (2) Polish the surface of the glassy carbon electrode GCE with 0.02-0.2 μM alumina solution, ultrasonically treat it in absolute ethanol and aqueous solution for 0.5-5 min, wash the polished electrode, and clean it with high-purity N 2 Blow dry to get bare glassy carbon electrode Bare-GCE;

[0029] (3) Bare-GCE, Ag / AgCl electrodes and Pt electrodes are immersed in [Fe(CN)6] containing 0.5-5mM volume ratio of 1:1 3- / 4-Perform a linear cyclic voltammetry scan in a solution of 0.02-0.5M KCl, and when the cyclic voltammetry curve with a potential difference lower than 75mV is obtained, the electrode can be used as the subst...

Embodiment 1

[0044] The anti-interference ability of the invented electrochemical sensor based on carbon nanotubes was evaluated. In this experiment, the invented electrochemical sensor based on carbon nanotubes was used as the working electrode, and the differential pulse voltammetry (DPV) was used to test the There may be interfering phenolic organic compounds such as catechol (CL, 100 μM) and hydroquinone (HQ, 100 μM). The result is as image 3 As shown, CL and HQ have oxidation peaks at 0.188 and 0.092V, and the oxidation peak potential difference of bisphenol A (0.472V) and bisphenol S (0.736V) is greater than 0.2V. The detection of bisphenol A and bisphenol S None of the signals were affected by it, indicating that the invented carbon nanotube-based electrochemical sensor has good selectivity for the detection of bisphenol A and bisphenol S.

Embodiment 2

[0046] The linear range and detection limit of the invented electrochemical sensor based on carbon nanotubes for bisphenol A and bisphenol S were evaluated. Use the invented electrochemical sensor based on carbon nanotubes to simultaneously measure bisphenol A and bisphenol S. The concentration of one substance is fixed at 50 μM, and the concentration of the other substance is changed. Observe whether the measurement interferes with each other. The results are shown in Figure 4 . Fig. 4A is the DPV curve obtained on the inventive electrochemical sensor based on carbon nanotubes when different concentrations of BPA are mixed with a certain concentration of BPS (50 μM). It can be known from this curve that adding different concentrations of BPA, BPS The peak currents of α remained almost constant, which indicated that the sensor had good resolving performance for these two substances. As shown in Figure 4B, Ip and BPA have a good linear relationship in the concentration range o...

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Abstract

The invention discloses an electrochemical sensor based on a carbon nanotube and a preparation method and application thereof and belongs to the field of environment analysis and electroanalytical chemistry. In a differential pulse voltammetry (DPV) mode, the electrochemical sensor can realize oxidation of interfering substances like catechol (CL, 0.188V) and hydroquinone (HQ, 0.092V) at low potential and does not cause interference to analysis of target substances (bisphenol A and bisphenol S) in the process of actual detection. In addition, peak potentials of the electrochemical sensor in the DPV mode to bisphenol A and bisphenol S are 0.472V and 0.736V, and difference is obvious, which is enough for realizing simultaneous detection of bisphenol A and bisphenol S. The electrochemical sensor has ultrahigh specific selectivity to bisphenol A and bisphenol S in complex matrixes, can effectively reduce matrix interference and can quickly, sensitively, accurately and efficiently analyze river water samples and thermosensitive paper samples.

Description

technical field [0001] The invention belongs to the fields of environmental analysis and electroanalytical chemistry. In particular, it relates to an electrochemical sensor based on carbon nanotubes and its preparation method and application. Background technique [0002] Bisphenol A is recognized as an endocrine disrupting chemical (EDC), and its harm to human reproduction and development, nervous system, cardiovascular system, metabolism and immune system has been widely confirmed. In view of this situation, the U.S. Environmental Protection Agency (USEPA) and the European Food Safety Authority (EFSA) have stipulated the reference value of the maximum daily intake of bisphenol A, and Health Canada has also done related work. The European Union has imposed strict restrictions on the migration of bisphenol A from plastic products used in food production. In response to these restrictions and regulations, many manufacturers began to use some structural analogues of bispheno...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 杨甲甲卢彦琦李梦佳卢茗竹
Owner HEBEI UNIV OF ENG
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