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Method for preparing nano silver by utilizing wool keratin

A wool keratin, nano silver technology, applied in 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: 2020-09-18
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 utilizing wool keratin
  • Method for preparing nano silver by utilizing wool keratin
  • Method for preparing nano silver by utilizing wool keratin

Examples

Experimental program
Comparison scheme
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 slowly drop it into it 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 ...

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Abstract

The invention relates to a method for preparing nano-silver from wool keratin, comprising the following steps: adding wool to molten urea, heat treatment and dialysis to obtain an aqueous wool keratin solution; adjusting the pH of the aqueous wool keratin solution to 9 with alkali ‑12, adding an aqueous solution of silver salt to it, and reacting the reaction solution at 80‑98°C to obtain nano silver. The method of the invention is simple, and the conditions are easy to control. The wool keratin extracted by molten urea is used as a reducing agent and a stabilizer to prepare nano-silver, which avoids the addition of other non-ecologically friendly reducing agents, polymer stabilizers and dispersants, and the obtained The nano-silver is directly applied to the fields of biological materials, composite materials, textile functional finishing agents and the like; the nano-silver obtained by the invention has uniform particle size, small particle size, good dispersibility and stability.

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 Patents(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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