Preparation method and application of nitrogen-doped carbon dot-reduced graphene oxide composite material

A technology of nitrogen-doped carbon dots and composite materials, applied in the field of composite materials, can solve the problems of electrochemical sensing sensitivity and detection limit difference, and the application of carbon quantum dots with poor conductivity, so as to improve the sensitivity and detection limit, and improve the conductivity rate and electron transport rate, the effect of high specific surface area

Pending Publication Date: 2022-05-27
HUNAN BRUNP RECYCLING TECH +2
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  • Abstract
  • Description
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Problems solved by technology

[0004] Although CQDs have a large specific surface area and strong adsorption capacity, and are rich in functional groups, CQDs have a wide range of applications in the adsorption of various heavy metal ions, organic pollutants and biological macromolecules. However, due to the electrical conductivity of carbon quantum dots Poor performance limits its application in the field of electrochemical sensing, and the sensitivity and detection limit of electrochemical sensing in the prior art are poor

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  • Preparation method and application of nitrogen-doped carbon dot-reduced graphene oxide composite material

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Embodiment 1

[0045]The preparation method of the nitrogen-doped carbon dots-reduced graphene oxide composite material (Er-NCQD / rGO) of the present embodiment includes the following steps:

[0046] (1) The glassy carbon electrode is polished on the chamois covered with alumina suspension, and is detected by an electrochemical workstation to obtain a qualified glassy carbon electrode for standby;

[0047] (2) First weigh 100mg of mung bean powder and 10mg of melamine in a beaker, add 50mL of distilled water and stir evenly, transfer to a polytetrafluoroethylene lining and then put into a high-pressure reactor, and put into a blast drying oven and heat to 180°C The reaction was carried out for 8 hours, and after cooling to room temperature, the liquid was filtered to obtain a brownish-yellow liquid, which was then centrifuged (8000 r / min) for 5 minutes, and the supernatant was collected, filtered and dialyzed to obtain a nitrogen-doped carbon dot solution;

[0048] (3) Weigh 2.5mg of graphene...

Embodiment 2

[0052] The preparation method of the nitrogen-doped carbon dots-reduced graphene oxide composite material (Er-NCQD / rGO) of the present embodiment includes the following steps:

[0053] (1) The glassy carbon electrode is polished on the chamois covered with alumina suspension, and is detected by an electrochemical workstation to obtain a qualified glassy carbon electrode for standby;

[0054] (2) First weigh 80mg of mung bean powder and 10mg of melamine in a beaker, add 50mL of distilled water and stir evenly, transfer to a polytetrafluoroethylene lining and put into a high-pressure reactor, and put into a blast drying oven and heat to 180°C The reaction was carried out for 8 hours, and after cooling to room temperature, the liquid was filtered to obtain a brownish-yellow liquid, and then centrifuged (8000r / min) for 5 minutes. The supernatant was collected, filtered and dialyzed to obtain a purified nitrogen-doped carbon dot solution. ;

[0055] (3) Weigh 5mg of graphene oxide...

Embodiment 3

[0059] The preparation method of the nitrogen-doped carbon dots-reduced graphene oxide composite material (Er-NCQD / rGO) of the present embodiment includes the following steps:

[0060] (1) The glassy carbon electrode is polished on the chamois covered with alumina suspension, and is detected by an electrochemical workstation to obtain a qualified glassy carbon electrode for standby;

[0061] (2) First weigh 120mg of mung bean powder and 10mg of melamine in a beaker, add 50mL of distilled water and stir evenly, transfer to a polytetrafluoroethylene lining and put into a high-pressure reactor, and put into a blast drying oven and heat to 180°C The reaction was carried out for 8 hours, and after cooling to room temperature, the liquid was filtered to obtain a brownish-yellow liquid, and then centrifuged (8000r / min) for 5 minutes. The supernatant was collected, filtered and dialyzed to obtain a purified nitrogen-doped carbon dot solution. ;

[0062] (3) Weigh 2.5mg of graphene ox...

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Abstract

The invention belongs to the technical field of composite materials, and discloses a preparation method and application of a nitrogen-doped carbon dot-graphene oxide composite material, the preparation method comprises the following steps: mixing a carbon source and a nitrogen source, and carrying out hydrothermal reaction and solid-liquid separation to obtain a nitrogen-doped carbon dot solution; the method comprises the following steps: mixing and stirring graphene oxide and a reducing agent, carrying out solid-liquid separation, taking a solid phase, and dissolving to obtain a pre-reduced graphene oxide solution; performing ultrasonic mixing on the nitrogen-doped carbon dot solution and the pre-reduced graphene oxide solution, dropwise adding the mixed solution on an electrode, and performing cyclic voltammetry reduction to obtain the nitrogen-doped carbon dot-graphene oxide composite material. The prepared nitrogen-doped carbon dot-graphene oxide composite material has the advantages of nitrogen-doped carbon dots and graphene oxide at the same time, is successfully applied to electrochemical sensing determination of Cd < 2 + > and Pb < 2 + > in actual soil, and has a test recovery rate of 89.33-106.91%, and the result is satisfactory.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method and application of a nitrogen-doped carbon dot-reduced graphene oxide composite material. Background technique [0002] Carbon quantum dots (CQDs) are zero-dimensional carbon nanomaterials with fluorescent properties, which are mainly used in the fields of fluorescence imaging, fluorescence sensing, and LED device research and development. In 2004, carbon quantum dots were reported for the first time, which have the characteristics of complex structure, various types and various preparation methods, and the chemical composition and lattice properties of different carbon quantum dots are also different. [0003] In the field of electrochemical sensing, carbon quantum dots are an ideal material with excellent performance. Its good chemical stability, strong photostability and water solubility endow carbon quantum dots with excellent sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/198G01N27/26
CPCC01B32/05C01B32/198G01N27/26C01P2004/80
Inventor 杨剑波王梦豪曹凯峰刘勇奇巩勤学李长东
Owner HUNAN BRUNP RECYCLING TECH
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