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Three-dimensional flower-like nano composite material as well as preparation method and application thereof

A nanocomposite material and three-dimensional flower-like technology, applied in nanotechnology, nanotechnology, analytical materials, etc., can solve the problems of poor conductivity, inconspicuous recognition effect and long recognition time of NiO, and achieve high sensitivity, excellent adsorption and catalysis The effect of simple performance and method

Inactive Publication Date: 2020-04-14
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of three-dimensional flower-shaped nano-composite material NiO / PDDA-RGO (nickel oxide-PDDA-reduced graphene oxide) and preparation method thereof, and this composite material is used for the detection of nitrite, to solve The existing technology has technical problems such as long recognition time, complicated and cumbersome, high cost, low sensitivity and inconspicuous recognition effect
[0004] In the present invention, three-dimensional flower-like NiO is combined with PDDA-RGO with good water solubility. The reduced graphene oxide in the composite material is used as the carrier of NiO, which not only overcomes the problem of poor conductivity of NiO, but also improves the adsorption characteristics of analytes to enhance Electrochemical performance, is an excellent electrode modification material

Method used

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  • Three-dimensional flower-like nano composite material as well as preparation method and application thereof
  • Three-dimensional flower-like nano composite material as well as preparation method and application thereof
  • Three-dimensional flower-like nano composite material as well as preparation method and application thereof

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Embodiment 1

[0027] A method for preparing a three-dimensional flower-like nanocomposite NiO / PDDA-RGO, comprising the following steps:

[0028] 1) Preparation of PDDA-RGO:

[0029] 20 mg of graphene oxide was ultrasonically treated in 20 mL of deionized water for 3 h to obtain a graphene oxide dispersion, which was then placed in a container. Next, take 10mL of graphene oxide dispersion with a concentration of 1.0mg / mL in the reaction bottle, add 50.0μL of 10.0wt% PDDA and stir well, then adjust the pH value to 10.0 with concentrated ammonia water; then add 50.0μL of 80% hydrated Hydrazine, stirred vigorously, put the reaction bottle into a 60°C water bath and heated for 4h, cooled to room temperature, washed and dried the synthesized material to obtain PDDA-RGO.

[0030] 2) Preparation of three-dimensional flower-like NiO:

[0031] Add 0.066g NH4F, 0.26g Ni(NO3)2.6H2O, 0.35g urea to the mixed solution of 20mL distilled water and 0.635mL ethylene glycol in sequence, stir the solution uni...

Embodiment 2

[0035] Establishment of nitrite detection method and anti-interference experiment of three-dimensional flower-like nanocomposite NiO / PDDA-RGO:

[0036] 1) The bare GCE surface was polished with 0.05 μm alumina particles and carefully rinsed with ultrapure water and ethanol until a mirror surface was obtained and dried, and 8 μL of the NiO / PDDA-RGO composite drop prepared in Example 1 was pipetted Apply it on the surface of glassy carbon electrode (GCE), and fully bake it under infrared lamp to obtain NiO / PDDA-RGO modified electrode (NiO / PDDA-RGO / GCE). As controls, NiO / GCE and PDDA-RGO / GCE were prepared using the same method.

[0037] 2) Immerse GCE, NiO / GCE, PDDA-RGO / GCE and NiO / PDDA-RGO / GCE in a solution of 0.1M PBS (pH 5) containing 1mM sodium nitrite, respectively, and record the corresponding electrodes of different electrodes by cyclic voltammetry. the peak current. Such as image 3 As shown, it can be seen that compared with other electrodes, NiO / PDDA-RGO / GCE has a be...

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Abstract

The invention provides a three-dimensional flower-like nano composite material as well as a preparation method and application thereof, the composite material is NiO / PDDA-RGO, and the material is prepared from PDDA-RGO and synthesized NiO by hydrothermal reaction and calcining via an ultrasonic-assisted method. Reduced graphene oxide in the composite material is used as a NiO carrier, so that theproblem of low NiO conductivity is solved, the adsorption characteristic of an analyte is improved to enhance the electrochemical performance, and the composite material is an excellent electrode modification material. The NiO / PDDA-RGO composite material is modified on the surface of an electrode to construct electrochemical sensing for enzyme-free nitrite detection. According to the method, thetechnical problems of long recognition time, complexity, high cost, low sensitivity, unobvious recognition effect and the like in the prior art are solved, high-sensitivity and high-selectivity detection for nitrite in a complex environment can be realized, and the composite material has a very good application prospect in the analysis fields of environments, foods and the like.

Description

technical field [0001] The invention relates to electrochemical detection of nanocomposite materials, in particular to a three-dimensional flower-shaped nanocomposite material, a preparation method thereof, and an application of the material in nitrite detection. Background technique [0002] Nitrite (NO 2- ) is a common and important ingredient in dyeing agents, food preservatives and agricultural fertilizers. However, NO 2- And the excessive use, long-term accumulation and large-scale discharge of toxic inorganic pollutants have caused great damage to the environmental system and human health, and even nitrite can interact with amines and amides to produce carcinogenic N-nitrosamines, Contributes to potential cancer risk and "blue baby syndrome". In addition, nitrite can irreversibly react with hemoglobin in human blood to produce methemoglobin, which will reduce the oxygen transport capacity of the blood. The World Health Organization has reported that lethal doses of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/26B82Y30/00B82Y15/00C01G53/04
CPCB82Y15/00B82Y30/00C01G53/04C01P2004/03G01N27/26G01N27/308
Inventor 伊雯雯李忠平郭玉晶董川
Owner SHANXI UNIV
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