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Magnetic surface molecular imprinting electrochemical sensor as well as preparation method and application thereof

A surface molecular imprinting and electrochemical technology, which is applied in the direction of material electrochemical variables, scientific instruments, and material analysis through electromagnetic means, can solve the problems of high cost of detection equipment and cumbersome sample processing, and achieve high sensitivity and specificity detection , low raw material cost, template molecular mass transfer rate block effect

Active Publication Date: 2022-06-21
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the technical problems existing in the prior art, the present invention provides a magnetic surface molecularly imprinted electrochemical sensor and its preparation method and application to solve the existing detection process of tetrabromobisphenol A, which has high cost of detection equipment, Complicated technical issues in sample pretreatment

Method used

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  • Magnetic surface molecular imprinting electrochemical sensor as well as preparation method and application thereof
  • Magnetic surface molecular imprinting electrochemical sensor as well as preparation method and application thereof
  • Magnetic surface molecular imprinting electrochemical sensor as well as preparation method and application thereof

Examples

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preparation example Construction

[0047] The present invention also provides a preparation method of a magnetic surface molecularly imprinted electrochemical sensor, comprising the following steps:

[0048] Step 1. Graphene oxide GO is prepared by Hummers method.

[0049] Step 2. Using solvothermal method, Fe 3 O 4 Magnetic nanoparticles were introduced into graphene oxide GO to prepare magnetic graphene oxide nanomaterials GO@Fe 3 O 4 .

[0050] Among them, the preparation of magnetic graphene oxide nanomaterials GO@Fe 3 O 4 process, as follows:

[0051] The graphene oxide GO was mixed with ethylene glycol, and after ultrasonic stirring for 30 min, FeCl was added. 3 ·6H 2 O and NaAc continued to be ultrasonically stirred for 15 min; after that, reacted at a temperature of 180-200 ° C for 1.5-2 h, magnetic separation, washing, and vacuum drying to obtain the magnetic graphene oxide nanomaterial GO@Fe 3 O 4 .

[0052] Step 3, using dopamine to modify the magnetic graphene oxide nanomaterial to obtain...

Embodiment 1

[0064] as attached figure 1 As shown, this embodiment 1 provides a preparation method of a magnetic surface molecularly imprinted electrochemical sensor, which specifically includes the following steps:

[0065] Step 1, using Hummers method to prepare graphene oxide GO;

[0066] The preparation process of graphene oxide GO is as follows:

[0067] Put 2g of NaNO 3 and 96mL of concentrated H 2 SO 4 and 2g of graphite phosphorus flakes were mixed and stirred at 0°C for 30min to obtain a mixed system A;

[0068] Put 12g of KMnO 4 It was added into the mixed system A in 3 times, stirred for 1.5 h, and then reacted at a constant temperature of 35 °C for 2 h; after that, 80 mL of pure water was added, and the reaction system was continued to react for 1 h after the reaction system reached 90 °C to obtain system one;

[0069] Put 20mL of H 2 O 2 Add to 200mL of deionized water, add 20mL of concentrated hydrochloric acid to 92mL of deionized water, then add to the above system on...

Embodiment 2

[0102] The steps of Example 2 are substantially the same as those of Example 1, and the difference lies in the pH of the PBS in Step 8.

[0103] Specifically, the pH of 6.0, 6.5, 7.0, 7.5 and 8.0 were prepared containing 5.0 mmol L -1 [Fe(CN) 6 ] 3- / 4-Buffer solution, modified Au / Mxene and the magnetic surface molecularly imprinted polymer GO@Fe on the surface of glassy carbon electrode 3 O 4 @MIP, phosphate buffer with pH of 6.0, 6.5, 7.0, 7.5 and 8.0 was used as the electrolyte in this experiment, the modified glassy carbon electrode was used as the working electrode, the platinum wire electrode was used as the counter electrode, and the Ag / AgCl electrode was used as the electrode. As a reference electrode, the optimal pH value of TBBPA was determined electrochemically, in which pH=7 had the best current response and was selected as the optimal pH.

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Abstract

The invention discloses a magnetic surface molecular imprinting electrochemical sensor as well as a preparation method and application thereof. The method comprises the following steps: introducing magnetic Fe3O4 nanoparticles onto graphene oxide; the preparation method comprises the following steps: modifying a magnetic graphene oxide nano material by using dopamine to obtain a polydopamine modified magnetic nano microsphere; carrying out surface azidation treatment to obtain an azide functionalized magnetic carrier; introducing an RAFT reagent into the azide functionalized magnetic carrier by utilizing click chemistry, polymerizing, and modifying a glassy carbon electrode by utilizing a magnetic surface molecularly imprinted polymer to obtain the magnetic surface molecularly imprinted electrochemical sensor. The magnetic surface molecular imprinting electrochemical sensor is rich in recognition sites, high in template molecule mass transfer rate, capable of efficiently detecting tetrabromobisphenol A in a to-be-detected sample, simple in principle, low in raw material cost, free of any large instrument in the detection process and high in detection efficiency. The high-sensitivity and specific detection on the tetrabromobisphenol A in the to-be-detected sample is realized.

Description

technical field [0001] The invention belongs to the technical field of molecularly imprinted electrochemical sensors, in particular to a magnetic surface molecularly imprinted electrochemical sensor and a preparation method and application thereof. Background technique [0002] As a persistent organic pollutant, tetrabromobisphenol A has a significant impact on the health of humans and other aquatic organisms; traditional detection methods are mostly based on chromatography and chromatography-mass spectrometry; for example: gas chromatography (GC-MS) ), gas chromatography-mass spectrometry (GC-MS) and high performance liquid chromatography (HPLC); among them, GC and GC-MS are the most commonly used detection techniques; however, chromatographic detection has expensive instruments and cumbersome sample pretreatment and other shortcomings. SUMMARY OF THE INVENTION [0003] Aiming at the technical problems existing in the prior art, the present invention provides a magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F283/00C08F226/06C08F222/14C08J9/26G01N27/30
CPCC08F292/00C08F283/00C08J9/26G01N27/308C08F2438/03C08J2351/10C08J2351/08C08F226/06C08F222/102
Inventor 邵彦明朱莹郑蕊王鹏赵芝镇安军王海花费贵强
Owner SHAANXI UNIV OF SCI & TECH
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