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Surface-functionalized Fe3O4 nanoparticles as well as preparation method and application thereof

A surface functionalization, nanoparticle technology, applied in the field of Cu2+ enrichment and detection, can solve the problem of weak surface interaction of nanomaterials, inability to have different reactive functional groups on the surface of ferric oxide nanomaterials, unfavorable surface modification of nanomaterials and application and other issues

Active Publication Date: 2012-06-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing surface modification methods include physical adsorption, surface deposition, electrostatic interaction and van der Waals force, etc. Most of these methods cannot make the surface of ferroferric oxide nanomaterials have different reactive functional groups, or although they have surface reactive functional groups, but The interaction with the surface of nanomaterials is weak, which is not conducive to the further surface modification and application of nanomaterials

Method used

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  • Surface-functionalized Fe3O4 nanoparticles as well as preparation method and application thereof
  • Surface-functionalized Fe3O4 nanoparticles as well as preparation method and application thereof
  • Surface-functionalized Fe3O4 nanoparticles as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: this surface functionalized Fe 3 o 4 The preparation method of nanoparticles comprises the following steps:

[0029] 1. Preparation of magnetic Fe3O4 nanoparticles

[0030] Take 2.0244 g FeCl 2 4H 2 O and 5.3904 g FeCl 3 ·6H 2 O was dissolved in 150 ml of distilled water, and under the condition of nitrogen protection, 55 ml of ammonia water was added dropwise with a constant pressure funnel at a rate of 5 ml / min, heated in a water bath at 65°C and stirred for 2 h, stopped heating, cooled naturally for 30 min, and distilled water , absolute ethanol, and toluene for 3 times, and vacuum-dried for 12 h to obtain magnetic Fe with uniform particle size distribution 3 o 4 Nanoparticles.

[0031] 2. Synthesis of 8-chloroacetylaminoquinoline derivatives

[0032] Take 0.95 g of 8-aminoquinoline in a round bottom flask, add 1 ml of triethylamine, then add 50 ml of dichloromethane solution, keep at 0°C for 30 min; Under light conditions, magnetic stirring...

Embodiment 2

[0041] Embodiment 2: this surface functionalized Fe 3 o 4 The preparation method of nanoparticles comprises the following steps:

[0042] 1. Preparation of magnetic Fe3O4 nanoparticles

[0043] Take 0.2 g FeCl 2 4H 2 O and 0.54 g FeCl 3 ·6H 2 O was dissolved in 50 ml of distilled water, and under the condition of nitrogen protection, 5.5 ml of ammonia water was added dropwise with a constant pressure funnel at a rate of 1 ml / min, heated in a water bath at 40°C and stirred for 6 h, then stopped heating, cooled naturally for 20 min, and then used distilled water, After washing with absolute ethanol and toluene for 3 times, and vacuum drying for 1 h, magnetic Fe with uniform particle size distribution was obtained. 3 o 4 Nanoparticles.

[0044] 2. Synthesis of 8-chloroacetylaminoquinoline derivatives

[0045] Take 0.095 g of 8-amino-2-ethylquinoline in a round bottom flask, add 0.1 ml of triethylamine, then add 5 ml of dichloromethane solution, keep at 0°C for 10 min; ...

Embodiment 3

[0053] Embodiment 3: this surface functionalized Fe 3 o 4 The preparation method of nanoparticles comprises the following steps:

[0054] 1. Preparation of magnetic Fe3O4 nanoparticles

[0055] Take 20g FeCl 2 4H 2 O and 54 g FeCl 3 ·6H 2 O was dissolved in 300 ml of distilled water, and under the condition of nitrogen protection, 100 ml of ammonia water was added dropwise with a constant pressure funnel at a rate of 10 ml / min, heated in a water bath at 90°C and stirred for 1 h, then stopped heating, cooled naturally for 60 min, and distilled water , absolute ethanol, and toluene for 3 times, and vacuum-dried for 24 h to obtain magnetic Fe with uniform particle size distribution. 3 o 4 Nanoparticles.

[0056] 2. Synthesis of 8-chloroacetylaminoquinoline derivatives

[0057] Take 9.5 g of 8-amino-2-methylquinoline in a round bottom flask, add 10 ml of triethylamine, then add 500 ml of dichloromethane solution, keep at 0°C for 60 min; then add 6 ml of chloroacetyl...

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Abstract

The invention discloses surface-functionalized Fe3O4 nanoparticles and a preparation method thereof, and a method for applying the nanoparticles to enrich and detect Cu<2+>. The method comprises the steps of: carrying out surface modification on ferroferric oxide nanoparticles through chemical covalent coupling by adopting a chemosynthetic 8-chloracetyl aminoquinoline derivative, treating Cu<2+> aqueous solutions of different concentrations by utilizing surface-functionalized magnetic ferroferric oxide nanoparticles, and then detecting the enriching and adsorbing effect by atomic absorption. The detection result shows that the surface-functionalized Fe3O4 nanoparticles have very strong enriching action on trace Cu<2+>, and the enriching capability is 10-15 times that of surface-unfunctionalized Fe3O4 nanoparticles. The surface-functionalized Fe3O4 nanoparticles prepared by the preparation method have the characteristics of good enriching effect and high adsorption efficiency to Cu<2+>, simplicity and convenience in operation and easiness in analysis; and by utilizing the method, trace Cu<2+> in the solution can be effectively enriched and detected.

Description

technical field [0001] The invention relates to a surface functionalized Fe 3 o 4 Nanoparticles and their preparation methods and applications, especially a method for surface modification and particle size control of iron ferric oxide nanoparticles with a synthetic 8-chloroacetamidoquinoline derivative, and applied to Cu 2+ enrichment and detection. Background technique [0002] Ferroferric oxide nanoparticles are widely used as magnetic recording materials, immobilized enzymes, immunodiagnosis, targeted drugs, catalyst carriers, magnetic microspheres and biological probes due to their magnetic properties, readily available raw materials, and low prices. In recent years, the synthesis and modification of magnetic Fe3O4 particles have attracted widespread attention. For example, in the Chinese patent whose publication number is CN 101554574A, an aminosilane coupling agent is used to modify the surface of glucose-coated superparamagnetic iron ferric oxide nanoparticles...

Claims

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Application Information

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IPC IPC(8): C09C1/24C09C3/12C09C3/08C02F1/28G01N33/00
Inventor 周阳孔祥峰马文会谢克强魏奎先伍继君戴永年
Owner KUNMING UNIV OF SCI & TECH
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