Method for preparing nano-silver by taking modified chitosan as reducing agent

A technology of chitosan and nano-silver, applied in the field of nano-materials, achieves the effect of simple process, mild reaction, and prevention of agglomeration

Inactive Publication Date: 2015-01-21
广州琶芙儿生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of nano-silver by selective oxidation of chitosan with sodium periodate as reducing agent and stabilizer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 2g of chitosan in 100ml of 3% acetic acid solution, sonicate for 1h, then add 2g / L sodium periodate, react in the dark at 80°C for 60min, wash repeatedly with deionized water, centrifuge, and dry for later use;

[0017] Dissolve 1g of modified chitosan in 100ml of deionized water to obtain a modified chitosan aqueous solution with a concentration of 10g / L, mix it with 10ml of silver ammonia solution with a concentration of 10g / L, and ultrasonicate it for 1h at a temperature of 80°C to obtain The nano-silver colloid solution was repeatedly washed with ethanol and deionized water, centrifuged at a speed of 9000r / min for 10min, and dried at 40°C for 20h in a vacuum environment to obtain nano-silver.

Embodiment 2

[0019] Dissolve 2g of chitosan in 100ml of 3% acetic acid solution, ultrasonicate for 5h, then add 5g / L sodium periodate, react in the dark at 60°C for 30min, wash repeatedly with deionized water, centrifuge, and dry for later use;

[0020] Dissolve 1g of modified chitosan in 50ml of deionized water to obtain a modified chitosan aqueous solution with a concentration of 20g / L, mix it with 10ml of silver ammonia solution with a concentration of 5g / L, and ultrasonicate it for 10h at a temperature of 20°C to obtain The nano-silver colloid solution was repeatedly washed with ethanol and deionized water, centrifuged at a speed of 8000r / min for 10min, and dried at 40°C for 24h in a vacuum environment to obtain nano-silver.

Embodiment 3

[0022] Dissolve 2g of chitosan in 100ml of 3% acetic acid solution, ultrasonicate for 10h, then add 10g / L sodium periodate, react in the dark at 40°C for 10min, wash repeatedly with deionized water, centrifuge, and dry for later use;

[0023] Dissolve 1g of modified chitosan in 20ml of deionized water to obtain a modified chitosan aqueous solution with a concentration of 50g / L, mix it with 10ml of silver ammonia solution with a concentration of 50g / L, and ultrasonicate it for 4 hours at a temperature of 40°C to obtain The nano-silver colloid solution was centrifuged at 10,000 r / min for 15 min, and dried under vacuum at 40°C for 4 h to obtain nano-silver.

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Abstract

The invention relates to a method for preparing nano-silver by taking modified chitosan as a reducing agent. The method includes: dissolving chitosan in a 3% acetic acid solution with the bath ratio of 1:50, performing ultrasound treatment for 1-12h, then adding 2-10g/L of sodium periodate, performing photophobic reaction at the temperature of 40-80 DEG C for 10-60min, repeatedly cleaning with deionized water, and performing centrifuging and drying for standby application; then mixing chitosan liquid modified by 0.01-100g/L of sodium periodate with 0.01-100g/L of Tollens' reagent, performing ultrasound treatment at the temperature of 20-80 DEG C for 1-10h to obtain nano-silver colloidal solution, repeatedly cleaning with ethyl alcohol and deionized water, and performing centrifuging and drying treatment to obtain nano-silver. By taking chitosan modified with the sodium periodate as the reducing agent and a stabilizer, the method has the advantages of simple technology, mild reaction, greenness, environment friendliness and the like.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a method for preparing nanosilver by using modified chitosan as a reducing agent. Background technique [0002] Nano-silver has excellent heat transfer, electrical conductivity, surface activity and catalytic properties, and has great application value in the fields of optics, catalysis, microelectronics, biosensing, and antibacterial. The traditional preparation of nano-silver is divided into physical method and chemical method. The physical method has higher requirements on instruments and equipment, and the production cost is expensive. Chemical methods often use hydrazine hydrate, formaldehyde, polyols, organic amines, etc. as reducing agents. Although these reducing agents have high activity, they are harmful to the environment, and the prepared nano-silver is prone to agglomeration. [0003] In recent years, the preparation of nano-silver by green, environmentally frien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 赵兵
Owner 广州琶芙儿生物科技有限公司
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