Magnetic chitosan/nano Fe3O4 composite and preparation method and application thereof

A composite material and chitosan technology, applied in chemical instruments and methods, nuclear magnetic resonance/magnetic resonance imaging contrast agents, alkali metal compounds, etc., can solve problems such as unfavorable industrial production, cumbersome process steps, and narrow application fields, and achieve Reduce the cumbersome steps of preparation, the preparation process is simple, and the effect of fast adsorption rate

Inactive Publication Date: 2013-01-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-cost, easy-to-industrialize large-scale and fast method for the existing preparation methods of magnetic chitosan materials, which mainly have problems such as expensive equipment, cumbersome process steps, unfavorable industrial production and narrow application fields. Production of Magnetic Chitosan / Nano-Fe 3 o 4 Composite material and its preparation method

Method used

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  • Magnetic chitosan/nano Fe3O4 composite and preparation method and application thereof
  • Magnetic chitosan/nano Fe3O4 composite and preparation method and application thereof
  • Magnetic chitosan/nano Fe3O4 composite and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Using 2wt% acetic acid solution to accurately prepare 3wt% chitosan solution. 0.1mol / LNH 4 Fe(SO 4 ) 2 12H 2 O and 0.05mol / L (NH 4 ) 2 Fe(SO 4 ) 2 12H 2 O was dissolved in water in proportion, and 10ml was added dropwise to the chitosan solution while stirring. After 2-60 minutes, a uniform and stable orange flocculent colloid was obtained. At room temperature, put a small beaker with flocs on a glass dish, pour 25wt% concentrated ammonia solution into the glass dish, and the orange flocs will turn brown after reacting in an ammonia atmosphere for 0.1-12 hours. The product was washed with distilled water and absolute ethanol, and vacuum-dried for 24h to obtain chitosan / nano-Fe 3 o 4 composite material. Chitosan / nanometer Fe prepared by embodiment 1 3 o 4 Composite magnetic map see figure 1 .

Embodiment 2

[0032] 0.2wt% chitosan solution was accurately prepared with 2wt% acetic acid solution. 0.1mol / LNH 4 Fe(SO 4 ) 2 12H 2 O and 0.05mol / L (NH 4 ) 2 Fe(SO 4 ) 2 12H 2 O was dissolved in water in proportion, and 10ml was added dropwise to the chitosan solution while stirring. After 2-60 minutes, a uniform and stable orange flocculent colloid was obtained. At room temperature, put a small beaker with flocs on a glass dish, pour 25wt% concentrated ammonia solution into the glass dish, and the orange flocs will turn brown after reacting in an ammonia atmosphere for 0.1-12 hours. The product was washed with distilled water and absolute ethanol, and vacuum-dried for 24h to obtain chitosan / nano-Fe 3 o 4 composite material. Chitosan / Fe 3 o 4 The nanocomposite product was dispersed in absolute ethanol, and then dropped onto a copper grid to dry and then observed under a field emission transmission electron microscope. Chitosan / nanometer Fe prepared by embodiment 2 3 o 4 TE...

Embodiment 3

[0034] 0.2wt% chitosan solution was accurately prepared with 2wt% acetic acid solution. 0.2mol / LNH 4 Fe(SO 4 ) 2 12H 2 O and 0.1mol / L (NH 4 ) 2 Fe(SO 4 ) 2 12H 2 O was dissolved in water in proportion, and 10ml was added dropwise to the chitosan solution while stirring. After 2-60 minutes, a uniform and stable orange flocculent colloid was obtained. At room temperature, put a small beaker with flocs on a glass dish, pour 25wt% concentrated ammonia solution into the glass dish, and the orange flocs will turn brown after reacting in an ammonia atmosphere for 0.1-12 hours. The product was washed with distilled water and absolute ethanol, and vacuum-dried for 24h to obtain chitosan / nano-Fe 3 o 4 composite material.

[0035] Chitosan / Nano Fe 3 o 4 The composite material is undergoing TG test, the condition is in nitrogen atmosphere, the heating rate is 10°C / min.

[0036] Chitosan / nanometer Fe prepared by embodiment 3 3 o 4 The thermal weight loss curve of composite...

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Abstract

The invention relates to a nanocomposite, in particular to a magnetic chitosan/nano Fe3O4 composite and a preparation method and application thereof. The composite comprises 60-99% of chitosan and 1-40% of nano Fe3O4. The preparation method includes: preparing chitosan solution A from acid solution; preparing solution B from NH4Fe(SO4)2 and (NH4)2Fe(SO4)2; adding the solution B into the solution A for reaction to obtain orange flocs; and reacting in ammonia gas so that the brown chitosan/nano Fe3O4 composite is obtained. By means of preparation by ammonia fumigating reaction, the nano Fe3O4 is obtained by aggregating nanoparticles with the particle size of 3-7nm to Fe3O4 nanoclusters with the particle size of 30-70nm, and the Fe3O4 nanoclusters are uniformly dispersed in a chitosan matrix. The magnetic chitosan/nano Fe3O4 composite has the advantages of large specific surface area, capability of being used for wastewater and waste gas treatment, rapidness in adsorption, high adsorption rate and capabilities of being isolated by the aid of a simple and convenient magnetic process and an adsorption system and being used as contrast agents.

Description

technical field [0001] The present invention relates to a kind of nanocomposite material, relate to a kind of magnetic chitosan / nanometer Fe especially 3 o 4 Composite materials and their preparation and use. Background technique [0002] Chitosan (chitosan) is the product of deacetylation of chitin and is an amino polysaccharide. Due to the advantages of low cost, biodegradability, good biocompatibility, easy chemical modification, and low secondary pollution, chitosan is widely used in water treatment, membrane technology, medical bioengineering, textiles and other fields. One of the most excellent natural polymers. Chitosan contains a large number of amino groups, hydroxyl groups, etc., and will form cationic polyelectrolytes in acidic solutions, showing good flocculation performance. At the same time, chitosan also has a good complexation effect. It can complex transition metal ions, humic acid substances and surfactants in water, and can absorb and remove water-solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/22B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30C02F103/30A61K49/06
Inventor 熊晓鹏林明峰
Owner XIAMEN UNIV
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