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Preparation method of MnO2/N-doped graphene electrochemical sensor and application of MnO2/N-doped graphene electrochemical sensor in zinc ion detection

A kind of ene electrochemical and sensor technology, applied in the field of biosensing, can solve the problems of sample pretreatment and operation professionalism, expensive application equipment, etc., to achieve improved stability and reproducibility, simple operation, good conductivity and Effect

Pending Publication Date: 2022-05-27
JIANGSU UNIV
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Problems solved by technology

Instrumental methods such as inductively coupled plasma-mass spectrometry have the advantages of good accuracy and high sensitivity; however, the application of this method is limited by expensive instruments, complex sample pretreatment and strong professionalism in operation

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  • Preparation method of MnO2/N-doped graphene electrochemical sensor and application of MnO2/N-doped graphene electrochemical sensor in zinc ion detection
  • Preparation method of MnO2/N-doped graphene electrochemical sensor and application of MnO2/N-doped graphene electrochemical sensor in zinc ion detection
  • Preparation method of MnO2/N-doped graphene electrochemical sensor and application of MnO2/N-doped graphene electrochemical sensor in zinc ion detection

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Embodiment 1

[0033] according to figure 1 Described preparation technological process, MnO 2 The preparation method of an electrochemical sensor of / N-doped graphene and its application in the detection of zinc ions in water, comprising the following steps:

[0034] The present invention first provides a green synthetic MnO 2 / N-doped graphene preparation method for rapid electrochemical detection of zinc ions in water, the steps are as follows:

[0035] (1) First, add 5-50 mg of N-doped graphene to KMnO 4 solution (concentration is 0.6-25mol / L, volume is 5-20mL); in the solution, the mixed solution is magnetically stirred for about 1h;

[0036] (2) The mixed solution was transferred to the reactor for hydrothermal reaction at 180°C for 1 h, cooled to room temperature, collected by centrifugation (rotation speed: 8000rpm, time: 10min), and washed three times with deionized water and ethanol. The product was vacuum-dried at 80° C. for 6 h, stored at room temperature, protected from ligh...

Embodiment 2

[0041] Prepared MnO 2 / N-doped graphene composites for detection of Zn 2+ , the feasibility is verified:

[0042] according to figure 2 Described preparation technological process, MnO 2 / N-doped graphene electrochemical sensor preparation method and zinc ion detection application, including the following steps:

[0043] from figure 2 It can be seen that the bare glassy carbon electrode detects 50 μM Zn 2+ , the electrochemical response is 4.64 μA. When 200 μg / mL N-doped graphene is modified, its electrochemical response is 14.55 μA, which is 2.1 times higher than that of the bare glassy carbon electrode. When 200 μg / mL MnO is modified 2 After / N doped graphene, its electrochemical response increased to 30.78 μA, which was 6.7 times higher than that of the bare glassy carbon electrode, indicating that the as-prepared MnO 2 / N-doped graphene improves the sensor's detection of Zn 2+ The sensitivity has a certain feasibility.

Embodiment 3

[0045] Determination of Zn by Electrochemical Stripping Voltammetry 2+ :

[0046] from image 3 (A), it can be seen that with Zn 2+ As the concentration increased (from top to bottom, 0.2 μM, 0.5 μM, 1 μM, 2 μM, 5 μM, 10 μM, 20 μM, 50 μM, 100 μM, 150 μM, 180 μM), the electrochemical signal gradually increased, which should be attributed to the dissolution voltage Anfa vs Zn 2+ The dissolution of Zn in solution 2+ The concentration keeps increasing. from image 3 (B), it can be seen that the electrochemical signal (I Zn 2+ ) and Zn 2+ Concentration value (C Zn 2+ ), the standard curve drawn is I Zn 2+ =0.597×C Zn 2+ -0.100, the linear range is 0.2 to 180 μM, and the detection limit is 0.0223 μM.

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Abstract

The invention belongs to the technical field of biosensing, and discloses a preparation method of a MnO2 / N-doped graphene electrochemical sensor and application of the MnO2 / N-doped graphene electrochemical sensor in zinc ion detection. The dispersed MnO2 / N doped graphene composite material is modified on a clean electrode, Zn < 2 + > in environmental water is firstly enriched on an electrode interface by utilizing stripping voltammetry, and then the Zn < 2 + > on the interface is detected, so that an electrochemical signal IZn < 2 + > is generated. According to the method, the electro-catalytic activity of an interface can be remarkably improved on the basis of N-doped graphene, the MnO2 material with catalytic activity and adsorbability is commonly used as a charge transfer medium in sensing interface construction, and Zn < 2 + > in environmental water is detected by combining excellent characteristics of MnO2 and N-doped graphene and combining high sensitivity of stripping voltammetry detection. The generation of the electrochemical signal is mainly attributed to charge transfer generated in the detection process of Zn < 2 + > by the stripping voltammetry. The detection linear range of the sensor is 0.2-180 [mu] M, the detection limit is 0.0223 [mu] M, and rapid, high-sensitivity and selective analysis of Zn < 2 + > is successfully realized.

Description

technical field [0001] The invention belongs to the technical field of biological sensing, in particular to a kind of MnO 2 Preparation method of / N-doped graphene electrochemical sensor and its application to Zn in environmental water samples 2+ rapid detection. Background technique [0002] Zinc is an essential mineral for human health and is involved in a variety of metabolic processes in the body, including some enzymatic reactions and some brain functions. It also plays an important role in many biological growth processes and is an essential micronutrient for the normal growth and reproduction of plants. However, when Zn 2+ When the content is too high, it will cause harm to the human body. Such as renal function and immunity decline, but also lead to coronary heart disease, arteriosclerosis and other diseases. Nowadays, many countries and world organizations have 2+ There are clear requirements for the content of Zn in drinking water in my country. 2+ The conte...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/42G01N27/416G01N27/333G01N27/30
CPCG01N27/48G01N27/42G01N27/4166G01N27/333G01N27/308Y02E60/13
Inventor 由天艳孟祥乐董秀秀刘东牛其建罗莉君
Owner JIANGSU UNIV
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