Preparation and application of magnetic ferroferric oxide nanoparticle modified carbon nanotube composite material

A technology of ferroferric oxide and nanoparticles, which is applied in the field of food safety testing, can solve the problems of too many organic reagents, easy loss of substances to be tested, complicated experimental steps, etc., and achieve improved adsorption, improved food testing efficiency, and excellent performance. Effect

Inactive Publication Date: 2018-03-16
甘肃省商业科技研究所有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses a lot of organic reagents, the experimental steps are complicated, and the s

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  • Preparation and application of magnetic ferroferric oxide nanoparticle modified carbon nanotube composite material
  • Preparation and application of magnetic ferroferric oxide nanoparticle modified carbon nanotube composite material
  • Preparation and application of magnetic ferroferric oxide nanoparticle modified carbon nanotube composite material

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Embodiment 1

[0035] 0.5g ferrous salt (FeCl 2 4H 2 O) and 0.5g ferric salt (FeCl 3 ·6H 2 O) mix and add to the beaker, then, 20mL volume fraction of 28% NH 3 ·H 2 Add O into the beaker; Stir vigorously to make it evenly mixed, keep the temperature in a water bath at 50°C, the mixture gradually turns from orange red to black, then continue to stir for 45 minutes to stop the reaction, centrifuge at 5000r / min, and wash repeatedly with distilled water Precipitate, until the pH value of the water after washing the precipitate is 7, remove the supernatant, dry it in vacuum at 60°C for 24h, and grind to obtain solid magnetic ferric oxide (Fe 3 o 4 ) nanoparticles; put 1 g of purified carbon nanotubes into a 100 mL flask, add 15 mL of concentrated nitric acid with a mass fraction of 68% and 45 mL of concentrated sulfuric acid with a mass fraction of 98%, and install a reflux condensation and absorption device , heated to reflux for 0.5h; after cooling to room temperature, the excess acid was...

Embodiment 2

[0038] 0.5g ferrous salt (FeCl 2 4H 2 O) and 0.5g ferric salt (FeCl 3 ·6H 2 O) mix and add to the beaker, then, 20mL volume fraction of 28% NH 3 ·H 2 Add O into the beaker; stir vigorously to make it evenly mixed, keep the temperature in a water bath at 70°C, the mixture gradually turns from orange red to black, then continue stirring for 45 minutes to stop the reaction, centrifuge at 5000r / min, and wash repeatedly with distilled water Precipitate, until the pH value of the water after washing the precipitate is 7, remove the supernatant, dry it in vacuum at 80°C for 24h, and grind to obtain solid magnetic iron tetroxide (Fe 3 o 4 ) nanoparticles; put 1 pretreated carbon nanotube into a 100 mL flask, add 15 mL of concentrated nitric acid with a mass fraction of 68% and 45 mL of concentrated sulfuric acid with a mass fraction of 98%, and install a reflux condensation and absorption device , heated to reflux for 0.5h; after cooling to room temperature, the excess acid was ...

Embodiment 3

[0041] 0.5g ferrous salt (FeCl 2 4H 2 O) and 0.5g ferric salt (FeCl 3 ·6H 2 O) mix and add to the beaker, then, 20mL volume fraction of 28% NH 3 ·H 2 Add O into the beaker; stir vigorously to make it evenly mixed, keep the temperature in a water bath at 60°C, the mixture will gradually turn from orange red to black, then continue stirring for 45 minutes to stop the reaction, centrifuge at 5000r / min, and wash repeatedly with distilled water Precipitate, until the pH value of the water after washing the precipitate is 7, remove the supernatant, dry it in vacuum at 70°C for 24h, and grind to obtain solid magnetic ferric oxide (Fe 3 o 4 ) nanoparticles; put 1 g of pretreated carbon nanotubes into a 100 mL flask, add 15 mL of concentrated nitric acid with a mass fraction of 68% and 45 mL of concentrated sulfuric acid with a mass fraction of 98%, and install a reflux condensation and absorption device , heated to reflux for 0.5h; after cooling to room temperature, the excess a...

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Abstract

The invention relates to preparation and application of a magnetic ferroferric oxide nanoparticle modified carbon nanotube composite material. The preparation method includes: mixing a divalent iron salt and a trivalent iron salt, adding NH3.H2O, conducting water bath and centrifugal separation, washing the precipitate, and carrying out drying and grinding to obtain magnetic Fe3O4 nanoparticles; adding concentrated nitric acid and concentrated sulfuric acid into pretreated carbon nanotubes, conducting heating refluxing, carrying out filtering, deionized water washing and vacuum drying, thus obtaining purified multiwalled carbon nanotubes; adding the purified multiwalled carbon nanotubes into a triethylene glycol solution, conducting ultrasonic treatment, adding magnetic Fe3O4 nanoparticles, performing stirring and heating, conducting heat preservation and cooling, separating the product, and conducting vacuum drying, thus obtaining the magnetic Fe3O4 nanoparticle modified carbon nanotube composite material. The composite material is used for detecting the residue amount of organophosphorus pesticides in food. The preparation method utilizes magnetic Fe3O4 nanoparticles to modify carbon nanotubes, and greatly improves the dispersibility and adsorption properties of carbon nanotubes in water. The prepared magnetic Fe3O4 nanoparticle modified carbon nanotube composite material hasgood stability, and the maximum recovery rate can reach 89.6%.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and relates to a composite nanomaterial used for detecting organophosphorus pesticide residues in food, in particular to a magnetic iron tetroxide (Fe 3 o 4 ) A method for preparing a nanoparticle-modified carbon nanotube composite material; the present invention also relates to an application of the composite nanomaterial in detecting organophosphorus pesticide residues in food. Background technique [0002] Pesticides have played an active role in preventing and controlling agricultural product diseases and insect pests, but they also pollute crops and the natural environment to varying degrees. Due to the stable chemical properties of many pesticides, they are not easy to degrade in nature. Animals eat the contaminated plants, which are enriched into animals through the food chain, resulting in the contamination of food of animal origin. The mixed and combined use of pesticide...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C01B32/168C01G49/08B82Y40/00B82Y30/00G01N30/02
CPCB01J20/205B01J20/28009B82Y30/00B82Y40/00C01B2202/06C01G49/08C01P2004/04C01P2004/80G01N30/02
Inventor 袁彩霞柴宗龙钱滢文张彦军王杰斌
Owner 甘肃省商业科技研究所有限公司
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