Nanometer composite material, preparing method and application

A technology of nanocomposite materials and core-shell nanomaterials, which is applied in the direction of material analysis, material excitation analysis, and material analysis through optical means, and can solve problems such as narrow application range, sensitivity, and extraction efficiency.

Inactive Publication Date: 2016-03-23
BEIJING NORMAL UNIVERSITY +1
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  • Abstract
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Problems solved by technology

However, there is still room for improvement in this method: for example, solid-phase extraction is usually based on hydrophobic interactions, dipole interactions, electron donor-acceptor interactions, etc., which are not highly selective in themselves, For the adsorption materials reported in the literature, any substance with a benzene ring structure may be extracted by adsorption; secondly, the solid phase extraction method also has a balance between adsorption on the solid surface and dissolution in the liquid phase, and the extraction efficiency is less than 100%; therefore , the extraction efficiency of this method is affected by many factors, and the scope of application is relatively narrow. Usually, it can only be applied to aqueous solutions with inorganic substrates. For more complex samples containing more organic components, such as beverages, the The non-analyte will produce competitive adsorption on the surface of the extraction material, the low selectivity of the method determines that the extraction efficiency is not high, and the sensitivity will also be affected

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  • Nanometer composite material, preparing method and application
  • Nanometer composite material, preparing method and application
  • Nanometer composite material, preparing method and application

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preparation example Construction

[0042] The present invention also provides a preparation method of the above-mentioned nanocomposite material, comprising: mixing the inner core of the upper half-generation dendrimer grafted by a silane compound with an aniline compound in an organic solvent, and after the reaction, the nanocomposite material is obtained ; the inner core is a magnetic core-shell nanomaterial; the half-generation dendrimer is a half-generation dendrimer terminal with an ester group; the amino number of the aniline compound is greater than or equal to 2.

[0043] Wherein, the magnetic core-shell nanomaterials, silane compounds, half-generation dendrimers and aniline compounds are the same as those described above, and will not be repeated here.

[0044] The preparation method of the magnetic core-shell nanomaterial is a preparation method well known to those skilled in the art, and there is no special limitation. In the present invention, the chemical precipitation method is preferably used, tha...

Embodiment 1

[0064] 1.1 At room temperature, first mix 12.98g of anhydrous FeCl 3 and 7.95gFeCl 2 4H 2 O (molar ratio: Fe(III) / Fe(II)=2:1) ​​was dissolved in 400mL of high-purity nitrogen deoxygenated water, heated to 80°C in a water bath, and 48mL of concentrated ammonia water was added with a constant pressure funnel under rapid stirring, and then, Stir and heat at this temperature for 6 hours, contact the outer wall of the round bottom flask with a magnet to collect magnetic nanomaterials, wash the obtained black powder three times with deionized water, add citric acid to 0.1mol / L ultrasonic 30min under the protection of nitrogen, magnetic Separated, washed with ethanol for 3 times, and then stored at 4°C to obtain ferric oxide nanomaterials. (Reaction principle: Fe 2+ +2Fe 3+ +8OH - →4H 2 O+Fe 3 o 4 )

[0065] 1.2 The Fe obtained in 4.63g1.1 3 o 4 Ultrasonic dispersion in 50mL of deionized water, followed by adding 25mL of 25% ammonia and 700mL of ethanol. At room temperatu...

Embodiment 2

[0084] Under the protection of nitrogen, the nanomaterial (Fe 3 o 4 SiO 2 G0.5, Fe 3 o 4 SiO 2 G1.5, Fe 3 o 4 SiO 2 G2.5 or Fe 3 o 4 SiO 2 G3.5) Disperse in 50mL of methyl isobutyl ketone and transfer to a round-bottomed flask, then add a certain amount of linker reagent into the flask, reflux and stir at 30°C for 48-96h to obtain a nanocomposite material , respectively denoted as Fe 3 o 4 SiO 2 G0.5-ARM, Fe 3 o 4 SiO 2 G1.5-ARM, Fe 3 o 4 SiO 2 G2.5-ARM and Fe 3 o 4 SiO 2 G3.5-ARM.

[0085] The dosages of linker reagents under the above reaction conditions are: p-diphenylamine 3-5g; m-diphenylamine 3-5g; 3,3'-diaminobenzidine 6-8.8g; 4,4'-diaminobenzidine 6 ~8.8g; 1,5-naphthalene diamine 6~8.8g; 2,6-naphthalene diamine 6~8g.

[0086] Potentiometric titration is used to measure the amino group on the surface of magnetic nanomaterials: Potentiometric titration utilizes the change in potential in the titration process to determine the titration end point. ...

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Abstract

The invention provides a nanometer composite material, a preparing method and application. The nanometer composite material comprises an inner core, half-generation dendrimers grafted on the inner core through a silane compound, and an aniline compound bonded on the half-generation dendrimers. The inner core is made of a magnetic core-shell nanometer material. Ester groups are formed at the tail ends of the half-generation dendrimers. The number of amino groups of the aniline compound is larger than or equal to 2. Compared with the prior art, the surface of the magnetic core-shell nanometer material is grafted with a branched structure, density of surface reaction groups is increased through the branched structure, the aniline structure at the tail end and nitrite in a solution react to generate diazonium salt, fluorescent dye molecules are bonded on the surface of the nanometer material in a covalent mode, the surface adsorption balance is not involved, extraction efficiency is high, the number of surface binding sites is large, extraction capacity is large, detection sensitivity is improved, fluorescence quantitative analysis is directly carried out after magnetic separation, and the analysis method is simple.

Description

technical field [0001] The invention belongs to the technical field of food detection, and in particular relates to a nanocomposite material, a preparation method and an application. Background technique [0002] Nitrite exists widely in water, soil, vegetables, and pickled animal foods, and has acute toxicity. When nitrite enters the stomach, it can react with amines to form a carcinogen—nitrosamine compound; after entering the blood, it reacts with heme to form methemoglobin containing ferric ions, which makes the blood lose its oxygen-carrying capacity, resulting in tissue hypoxia. Nitrite can also reduce the weight of the thymus and spleen, affect the activity of T and B lymphocytes and antibody secretion, and inhibit the function of humoral and cellular immunity. Therefore, nitrite has become an important item in environmental monitoring and food analysis. [0003] At present, the Griess reagent colorimetric method (corresponding to my country's national standard GB / T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00G01N21/64
CPCC08G83/004G01N21/643
Inventor 秦卫东王白娅
Owner BEIJING NORMAL UNIVERSITY
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