Method for preparing nano silver by using wool keratin

A wool keratin, nano-silver technology, applied in the directions of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effects of easy control of conditions, good dispersion and stability, and small particle size

Active Publication Date: 2017-11-24
NANTONG TEXTILE & SILK IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of green chemistry, excessive addition of toxic reducing agents such as sodium borohydride and hydrazine hydrate is not an environmentally friendly method

Method used

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  • Method for preparing nano silver by using wool keratin
  • Method for preparing nano silver by using wool keratin
  • Method for preparing nano silver by using wool keratin

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Extraction of wool keratin: heat 75g of urea at 160°C, add 10g of shredded wool after the urea melts, treat at a constant temperature of 160°C for 30min, then add water under continuous stirring, cool to 50°C, filter, and The obtained filtrate was put into a dialysis bag with a theoretical molecular weight cut-off of 3000 Da, and flow-dialyzed with distilled water for 72 hours. After the dialysate was filtered, it was diluted with water to 2 L to obtain a wool keratin solution.

[0032] (2) Preparation of nano-silver: take a certain amount of wool keratin solution obtained in step (1), dilute with water until the keratin concentration is 0.0057g / L, 0.0170g / L and 0.0227g / L weighing method), adjust the pH value to 11 with sodium hydroxide, and then slowly add silver nitrate solution to it at a uniform speed to a concentration of 0.170g / L. Aqueous solution of silver nanoparticles.

[0033] The molecular mass of keratin in the wool keratin solution obtained in this emb...

Embodiment 2

[0039](1) Extraction of wool keratin: heat 100g of urea at 160°C, add 10g of shredded wool after the urea melts, treat at a constant temperature of 160°C for 30min, then add water under constant stirring, cool to 50°C, filter, and The obtained filtrate was put into a dialysis bag with a theoretical molecular mass cut-off of 3000 Da, and flow-dialyzed with distilled water for 72 hours. After the dialysate was filtered, it was diluted with water to 1 L to obtain a wool keratin solution.

[0040] (2) Preparation of nano-silver: Take a certain amount of wool keratin solution obtained in step (1), dilute with water until the keratin concentration is 0.0170g / L, adjust the pH value to 10, 10.5, 11.0 and 11.5 with sodium hydroxide , and then slowly dropwise add silver nitrate solution to it at a uniform speed until its concentration is 0.170g / L. After the dropwise addition, raise the temperature to 90° C., and keep it warm for 40 minutes to obtain an aqueous solution of nano silver.

...

Embodiment 3

[0043] (1) Extraction of wool keratin: heat 50g of urea at 160°C, add 10g of shredded wool after the urea melts, treat at a constant temperature of 160°C for 30min, then add water under continuous stirring, cool to 50°C, filter, and The obtained filtrate was put into a dialysis bag with a theoretical molecular weight cut-off of 3000 Da, and flow-dialyzed with distilled water for 72 hours. After the dialysate was filtered, it was diluted with water to 2 L to obtain a wool keratin solution.

[0044] (2) Preparation of nano-silver: Take a certain amount of wool keratin solution obtained in step (1), dilute it with water until the keratin concentration is 0.0170g / L, adjust the pH value to 11 with sodium hydroxide, and then drop it slowly at a uniform speed Add silver nitrate solution until the concentration is 0.034, 0.068, 0.102, 0.136 and 0.170g / L. After the dropwise addition, raise the temperature to 90°C and keep it warm for 40 minutes to obtain the nano silver aqueous solution...

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Abstract

The invention relates to a method for preparing nano silver by using wool keratin. The method for preparing the nano silver by using the wool keratin comprises the following steps that wool is added into fused carbamide, after heating treatment and dialysis, a wool keratin aqueous solution is obtained; pH of the wool keratin aqueous solution is adjusted to 9-12 by using alkali, a aqueous solution of silver salt is added into the wool keratin aqueous solution, reaction is conducted on the reactant solution at 80-98 DEG C, and the nano silver is obtained. According to the method for preparing the nano silver by using the wool keratin, the method is simple, the condition is easy to control, the extracted wool keratin by using the fused carbamide is taken as a reductant and a stabilizer to prepare the nano silver, adding of other non ecological friendly reductant, polymer stabilizer and dispersant is avoided, the obtained nano silver can be directly applied to biological materials, composite materials and textile functional finishing agent and other fields; and the particle size of the nano silver is uniform, the particle diameter is smaller, and the dispersity and the stability are good.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing nanosilver by using wool keratin. Background technique [0002] my country is a big country in the wool spinning industry, and is extremely rich in wool varieties and resources. However, due to the constraints of wool quality, breeding management, textile technology and other factors, a large amount of discarded short wool fibers and crude fibers are produced every year. The discarded wool mainly comes from the following three aspects: one is the poor quality wool caused by some sheep breeds and poor living environment; The wool staple fibers with poor properties have basically no textile value; the third is a large amount of waste wool produced during the production and processing of farms, slaughterhouses, and tanneries. If these discarded wools are discarded at will, it is not only a waste of resources, but also pollutes the environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/054
Inventor 王冬悦李冰艳杨旭红唐人成
Owner NANTONG TEXTILE & SILK IND TECH RES INST
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