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Magnetic carbon nanotube composite material and preparation method and application thereof

A technology of magnetic carbon nanotubes and composite materials, which is applied in material separation, analysis materials, separation methods, etc., can solve problems such as limited adsorption capacity, and achieve the effects of difficult separation, strong magnetism, and large surface area.

Inactive Publication Date: 2015-07-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption capacity of pure magnetic materials is limited, so it is necessary to carry out appropriate modification on its surface to improve the selectivity and adsorption performance.

Method used

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  • Magnetic carbon nanotube composite material and preparation method and application thereof
  • Magnetic carbon nanotube composite material and preparation method and application thereof
  • Magnetic carbon nanotube composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Amino-modified magnetic Fe 3 o 4 -Preparation method of carbon nanotube composite material

[0032] (1) Weigh 1.35g FeCl 3 ·6H 2 O was added to 35mL ethylene glycol solution

[0033] (2) Then add 3.6g of anhydrous sodium acetate and 1.0g of polyethylene glycol, add 0.2g of carboxylated multi-walled carbon nanotubes, and ultrasonically disperse for 0.5h

[0034] (3) After ultrasonic dispersion, add 6 g of hexamethylenediamine, stir mechanically for 0.5 h at a stirring speed of 300 rpm, transfer the liquid to a sealed stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene lining, and heat to 220 ℃ reaction 8h

[0035] (4) The obtained product was washed 6 times with deionized water and absolute ethanol, and dried under vacuum at 80°C to obtain amino-modified magnetic Fe 3 o 4 - Carbon nanotube composites.

[0036] The ultrasonic dispersion time in the step (2) is 0.5~1h; in the step (3), the liquid is transferred to the reactor, hea...

Embodiment 2

[0038] Example 2: Amino-modified magnetic Fe 3 o 4 -Carbon nanotube composite used to purify tea extract

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Abstract

The invention discloses a magnetic carbon nanotube composite material and a preparation method and an application thereof. The preparation method comprises the following steps: adding FeCl3.6H2O to an ethylene glycol solution; then adding anhydrous sodium acetate and polyethylene glycol; adding a carboxylated multiwalled carbon nanotube; performing ultrasonic dispersion; adding hexamethylenediamine or ethanediamine; heating to 200-300 DEG C for reaction for 8-24h; and washing and performing vacuum drying to prepare the amino-modified magnetic Fe3O4-carbon nanotube composite material. The amino-modified magnetic Fe3O4-carbon nanotube composite material prepared by the invention is of nanoscale and superparamagnetism, can be stably dispersed in solutions, and can be quickly separated and enriched through a simple action of a magnetic field. As an adsorbent, the material is large in superficial area and has various active groups on the surface. The material can adsorb pigments from complex substrates through pi-pi electron interaction and hydrophobic effect of the carbon nanotube and can adsorb compounds such as organic acids and phenols through weak anion exchange effect of amino groups on the surfaces of magnetic nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of functional materials and analysis, more specifically, relates to an amino-modified magnetic Fe 3 o 4 - Preparation method of carbon nanotube composite material and its application in pretreatment of pesticide residue detection samples. Background technique [0002] Pesticides are widely used in agricultural production to improve product quality and yield, but the hazards of pesticide residues are also becoming more and more serious. Developed countries have successively established limit standards for pesticide residues in agricultural products. However, most agricultural product extracts are mixtures of many different substances, and the content of the target compound to be detected is often very low. Therefore, effective sample pretreatment, including separation, purification and enrichment, is the prerequisite for accurate analysis and identification. At present, for the analysis of multi-component ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J41/10B01D15/08B01D15/04G01N1/34G01N30/06
Inventor 邓小娟姚琲
Owner TIANJIN UNIV
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