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Chitosan polyamine derivative-silver supported nanometer titanium dioxide composite material

A technology of nano-titanium dioxide and chitosan polyamine, which is applied in the field of preparation of chitosan polyamine derivatives-silver-loaded nano-titanium dioxide composite materials, can solve the problems of no chemical modification of chitosan, and achieve improved application value and stability Good, broad-spectrum effect

Inactive Publication Date: 2012-11-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application CN101297654A discloses "a method for preparing a silver-loaded silica-chitosan composite antibacterial agent". Although this method successfully composites chitosan and silica, it does not chemically modification, and CN1927924A discloses a kind of chitosan quaternary ammonium salt and organic montmorillonite nanocomposite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of 1,3-dibromopropaneethylenediamine chitosan-silver loaded nano-titanium dioxide composites

[0019] 1. Preparation of ethylenediamine derivatized products of chitosan

[0020] 1), deep deacetylation of chitosan

[0021] The method is carried out according to the published report (Jiang Tingda, Chitosan, Chemical Industry Press, 2001: 73), and the obtained product is vacuum-dried at 60°C.

[0022] 2), the benzaldehyde protection of the amino group of chitosan

[0023] This method is carried out according to the published report (Belalia R. et al. J Agric. Food Chem., 2008, 56: 1582-1588), and the obtained product is filtered under reduced pressure at room temperature, washed three times with a mixture of ethanol and water, 60 ℃ vacuum drying.

[0024] 3), 1,3-dibromopropane derivatization of benzaldehyde-protected chitosan

[0025] Dissolve 6.5mL of 1,3-dibromopropane in 60mL of DMF, stir at 40°C, add 2.5g of benzaldehyde chitosan to the mixed solution ...

Embodiment 2

[0034] Preparation of Diethylenetriamine Derivatized Product of Chitosan-Silver-loaded Titanium Dioxide Composite

[0035] 1. Preparation of ethylenetriamine derivatized products of chitosan

[0036] 1), the preparation of 1,3-dibromopropane chitosan

[0037] The preparation method of 1,3-dibromopropane benzaldehyde chitosan is as described in process 1-3 in part (1) of Example 1.

[0038] 2), the preparation of the diethylenetriamine of benzaldehyde protection

[0039] Add the mixture of 19mL of benzaldehyde and 5mL of ethanol into the flask, and after magnetically stirring in an oil bath at 40°C for 0.5h, start to add the mixture of 10mL of diethylenetriamine and 5mL of ethanol dropwise with a constant pressure dropping funnel, and stir for 6h at constant temperature Afterwards, the reaction temperature was lowered to 20° C., and the ethanol was distilled off with a rotary evaporator, and the remaining mixture was prepared for the next reaction.

[0040] 3), the reaction of...

Embodiment 3

[0045] Preparation of triethylenetetramine derivatized product of chitosan-silver-loaded nano-titanium dioxide composite

[0046] 1. Preparation of triethylenetetramine derivatized products of chitosan

[0047] 1), the preparation of 1,3-dibromopropane chitosan

[0048] The preparation method of 1,3-dibromopropane benzaldehyde chitosan is as described in process 1)-3) in part (1) of Example 1.

[0049] 2), preparation of triethylenetetramine protected by benzaldehyde

[0050] Add the mixture of 15mL of benzaldehyde and 5mL of ethanol into the flask, stir at 40°C for 0.5h, start to add the mixture of 10mL of triethylenetetramine and 5mL of ethanol dropwise with a constant pressure dropping funnel, stir and react at constant temperature for 12h, then reduce the reaction The temperature was brought to 20°C, and the ethanol was distilled off with a rotary evaporator, and the remaining mixture was used for the next reaction.

[0051] 3), the reaction of 1,3-dibromopropane deriva...

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Abstract

The invention discloses a preparation method of a series of chitosan polyamine derivative-silver supported nanometer titanium dioxide composite material. The composite material comprises chitosan polyamine derivatives and silver supported nanometer titanium dioxide. The preparation method of the composite material comprises the following steps: preparing the series of the chitosan polyamine derivatives; suspending the derivatives in a certain amount of an organic solvent which can be an alcohol, acetonitrile, DMF, or DMSO, or in a mixed system of the organic solvent and water; stirring; heating; adding the prepared silver supported nanometer titanium dioxide; reacting for a period of time; carrying out reduced pressure filtration; washing; and drying to obtain the chitosan polyamine derivative-silver supported nanometer titanium dioxide composite material. The composite material has the advantages of nontoxicity, low price, biodegradability and the like of chitosan natural substances, and also has the advantages of high stability and efficient antibacterial property of nanometer titanium dioxide and the advantages comprising the efficient antibacterial property and the like of silver ions, so the composite material has large application values in the antibacterial property and the heavy metal ion removal, and has superior performances incomparable by single materials.

Description

Technical field: [0001] The invention relates to the preparation of a chitosan polyamine derivative-silver-loaded nano-titanium dioxide composite material. Background technique: [0002] In recent years, chitosan, as a natural, non-toxic, biodegradable and environmentally friendly material, has shown attractive development prospects in its application. It is widely used in environmental protection, chemical industry, cosmetics, food industry, heavy metal treatment, medicine, separation membrane materials, medical supplies, and bioengineering. Because chitosan has a straight-chain skeleton, many hydroxyl groups, amino groups and some N-acetylamino groups are connected to the chain, forming intramolecular and intermolecular hydrogen bonds, with strong polarity, making chitosan materials easy to crystallize and dense in structure. , poor solubility, which greatly limits its scope of application, so it needs to be structurally modified. By introducing new molecular groups to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/22C08K3/08C08B37/08
Inventor 汪中明吴娜韩克飞朱红
Owner BEIJING UNIV OF CHEM TECH
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