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Method for preparing hemicellulose/nano-silver colloid rapidly

A nano-silver sol, hemicellulose technology, applied in the nano field, can solve the problems of inability to provide basic data and theoretical basis, limit the application of hemicellulose, insufficient physical and chemical properties of hemicellulose, etc. The effect of functionalization and high-value utilization

Active Publication Date: 2014-04-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The understanding of the physical and chemical properties of hemicellulose is not enough to provide basic data and theoretical basis for its further application in specific fields, which also limits the application of hemicellulose in other fields
However, the research on using hemicellulose as a reducing agent and stabilizing agent to prepare nano-metals has not been reported yet.

Method used

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  • Method for preparing hemicellulose/nano-silver colloid rapidly
  • Method for preparing hemicellulose/nano-silver colloid rapidly
  • Method for preparing hemicellulose/nano-silver colloid rapidly

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Embodiment 1

[0028] 0.1020 g of AgNO 3 Dissolved in 20 mL deionized water to make 5.10 mg / mL AgNO 3 aqueous solution, 80 mg / mL NaOH aqueous solution was added dropwise to the AgNO 3 solution until the precipitation no longer increases, and then immediately drop 100 mg / mL ammonia water until the precipitation just dissolves, forming solution. Prepare a sodium hydroxide solution with a mass percentage of 1%, and hemicellulose (extracted from gramineous plants, whose weight-average molecular weight is 4.8×10 4 g / mol, the sugar composition is 86.00% xylose, 11.00% arabinose, 0.60% glucose, 0.20% galactose, 0.10% mannose and 2.50% glucuronic acid) dissolved in 20 mL sodium hydroxide solution In, a 1.5% (w / v) hemicellulose sodium hydroxide solution was prepared. After stirring evenly, place it in a microwave reactor, adjust the microwave radiation power to 700 W, and the radiation temperature to 50 °C; The solution is dropped into the hemicellulose solution, at this time the hemicellulos...

Embodiment 2

[0032] 0.1326 g of AgNO 3 Dissolved in 20 mL deionized water to make 6.63 mg / mL AgNO 3 aqueous solution, 80 mg / mL NaOH aqueous solution was added dropwise to the AgNO 3 solution until the precipitation no longer increases, then immediately drop 200 mg / mL of ammonia water until the precipitation just dissolves, forming solution. Prepare a sodium hydroxide solution with a mass percentage of 2%, and hemicellulose (extracted from gramineous plants, whose weight-average molecular weight is 5.0×10 4 g / mol, the sugar composition is 87.00% xylose, 10.00% arabinose, 0.70% glucose, 0.30% galactose, 0.12% mannose and 2.15% glucuronic acid) dissolved in 30 mL sodium hydroxide solution In , a 1 % (w / v) hemicellulose sodium hydroxide solution was prepared. After stirring evenly, place it in a microwave reactor, adjust the microwave radiation power to 800 W, and the radiation temperature to 60 °C; The solution is dropped into the hemicellulose solution, at this time the hemicellulose...

Embodiment 3

[0036] 0.4080 g of AgNO 3 Dissolved in 20 mL deionized water to make 20.40 mg / mL AgNO 3 aqueous solution, 80 mg / mL NaOH aqueous solution was added dropwise to the AgNO 3 solution until the precipitation no longer increases, and then immediately drop 400 mg / mL of ammonia water until the precipitation just dissolves, forming solution. Prepare a sodium hydroxide solution with a mass percentage of 3%, hemicellulose (extracted from gramineous plants, its weight-average molecular weight is 5.2×10 4 g / mol, the sugar composition is 88.00% xylose, 9.00% arabinose, 0.80% glucose, 0.40% galactose, 0.13% mannose and 1.75% glucuronic acid) dissolved in 40 mL sodium hydroxide solution In, a 0.75% (w / v) hemicellulose sodium hydroxide solution was prepared. After stirring evenly, place it in a microwave reactor, adjust the microwave radiation power to 900 W, and the radiation temperature to 70 °C; The solution is dropped into the hemicellulose solution, at this time the hemicellulose ...

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Abstract

The invention discloses a method for preparing a hemicellulose / nano-silver colloid rapidly. The method includes the steps that in a water phase, hemicellulose and silver ammonia solution are subjected to a redox reaction under the microwave condition to generate nano-silver particles; the hemicellulose is extracted from the grass family, the weight-average molecular weight of the hemicellulose is 4.5*104 g / mol-5.5*104 g / mol, and the hemicellulose comprises, by mass percent, the following carbohydrate components: 85-90% of wood sugar, 7.5-12% of arabinose, 0.5-1% of glucose, 0.15-0.65% of galactose, 0.08-0.15% of mannose and 1.05-2.95% of glucuronic acid. The preparation meets the requirement for green chemistry, and the method is a nano-metal preparing method which is green and rapid to implement. A new conception is provided for the green synthesis of nano-silver, the hemicellulose resource is reasonably utilized, and the nano-silver colloid has application prospects in the biological field and the medical field.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a rapid preparation method of hemicellulose / nano silver sol. Background technique [0002] Nano silver is widely used in catalysis, superconductivity, biomaterials, optical materials, medical antibacterial materials and other fields due to its good properties. The preparation methods of nano-silver mainly include chemical reduction method, photochemical method, microemulsion method and radiation method. However, the traditional chemical reduction method needs to use chemical reagents such as hydrazine hydrate and sodium borohydride as reducing agents, and then add sodium citrate as a stabilizer. In the preparation process, it is often necessary to add a variety of chemical reagents, making it difficult for nano-silver products to be reduced. Agents and stabilizers are completely separated, which limits the application of nano-silver in biological, medical and other fiel...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
Inventor 王小英罗玉琼申素琴李堃曼孙润仓
Owner SOUTH CHINA UNIV OF TECH
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