Green and quick method for preparing lignin-nanosilver sol

A nano-silver sol and lignin technology, applied in the field of nanometers, can solve problems such as environmental pollution, difficult separation of nano-silver, and restrictions on the application of nano-silver, achieving high efficiency, simple operation, and easy reunion

Active Publication Date: 2014-05-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical reduction method is a relatively common preparation method, but because chemical reagents such as sodium citrate, sodium borohydride and hydrazine hydrate are often used as reducing agents and stabilizers in the preparation process, it will pollute the environment and it is difficult to It is completely separated from nano-silver, which greatly limits the application of nano-silver in the field of biomedicine

Method used

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  • Green and quick method for preparing lignin-nanosilver sol
  • Green and quick method for preparing lignin-nanosilver sol
  • Green and quick method for preparing lignin-nanosilver sol

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Effect test

Embodiment 1

[0028] In a dark environment, the NaOH solution with a mass concentration of 100 mg / mL was slowly added dropwise to 100 mg / mL AgNO 3 solution (0.2040 g AgNO 3 ), stirring while adding dropwise until no more precipitation occurs, then slowly add ammonia water with a mass fraction of 20% to the mixed solution, continue stirring, stop adding ammonia water when the precipitate is completely dissolved, dilute with ultrapure water, and prepare 25 mL of [Ag(NH 3 ) 2 ] + solution. Then 0.3 g of lignin acetate (molecular weight 3500 g / mol and having guaiacyl (G), syringyl (S) and p-hydroxyphenyl ( H) Three basic unit structures) were dissolved in NaOH solution with a mass fraction of 2%, and made into a lignin solution with a mass fraction of 0.8%, and placed in a microwave reactor after stirring evenly, and the microwave radiation power was adjusted to 700 W, The microwave irradiation temperature was 50 °C. Then inject the newly prepared silver ammonia solution into the lignin s...

Embodiment 2

[0030] Slowly add NaOH solution with a mass concentration of 50 mg / mL to 50 mg / mL AgNO in a dark environment 3 solution (0.7140 g AgNO 3 ), stirring while adding dropwise until no more precipitation occurs, then slowly add ammonia water with a mass fraction of 25% into the mixed solution, continue stirring, stop adding ammonia water when the precipitate is completely dissolved, dilute with ultrapure water, and prepare 30 mL of [Ag(NH 3 ) 2 ] + solution. Then 0.35 g of alkali lignin (molecular weight 4000 g / mol and having guaiacyl (G), syringyl (S) and p-hydroxyphenyl ( H) three basic unit structures) were dissolved in NaOH solution with a mass fraction of 5%, and made into a lignin solution with a mass fraction of 2%, and placed in a microwave reactor after being stirred evenly, and the microwave radiation power was adjusted to 600 W, The microwave irradiation temperature was 70 °C. Then inject the newly prepared silver ammonia solution into the lignin solution through t...

Embodiment 3

[0032] In a dark environment, the NaOH solution with a mass concentration of 150 mg / mL was slowly added dropwise to 60 mg / mL AgNO 3 solution (0.2975 g AgNO 3 ), stirring while adding dropwise until no more precipitation occurs, then slowly add ammonia water with a mass fraction of 15% into the mixed solution, continue stirring, stop adding ammonia water when the precipitate is completely dissolved, dilute with ultrapure water, and prepare 20 mL of [Ag(NH 3 ) 2 ] + solution. Then 0.25 g of alkali lignin (molecular weight 5000 g / mol and having guaiacyl (G), syringyl (S) and p-hydroxyphenyl ( H) Three basic unit structures) were dissolved in NaOH solution with a mass fraction of 3%, and made into a lignin solution with a mass fraction of 1.5%, and placed in a microwave reactor after stirring evenly, and the microwave radiation power was adjusted to 700 W, The microwave irradiation temperature is 60 °C. Then inject the newly prepared silver ammonia solution into the lignin s...

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Abstract

The invention discloses a green and quick method for preparing lignin-nanosilver sol. The nanosilver sol is obtained by reacting lignin serving as a reducer and stabilizer with ammoniacal silver nitrate under the condition of microwave radiation. The preparation method comprises the following steps of obtaining [Ag(NH3)2] <+> through coactions of AgNO3, NaOH and ammonia water; reacting the [Ag(NH3)2]<+> with the lignin under the condition of microwave radiation to obtain the nanosilver sol. The concentration and the particle size of the nanosilver are controlled by adjusting the temperature and time for microwave reaction and a ratio of the lignin to the AgNO3, and the obtained nanosilver can be wrapped by the lignin, and is uniformly dispersed and difficultly agglomerated. The preparation method accords with the concept of 'green chemistry'. The method provides a technology orientation for utilizing forestry and agricultural residues at high values, and provides a new way for compounding nanocrystalline metal. Meanwhile, the nanosilver has a great application prospect in the fields of medical treatment and biology.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a green rapid preparation method of lignin-nanometer silver sol. Background technique [0002] Silver is a chemically active noble metal with good electrical conductivity, ductility, thermal conductivity, and antibacterial and bactericidal properties. Nano-silver has good surface effect, quantum size effect and other characteristics, and has good catalytic, superconducting, reduction-oxidation and bactericidal and antibacterial effects, making it widely used in microelectronics, enhanced Raman, medicine, optical biomaterials and other fields. It has broad application prospects. For the preparation of nano-silver, there are many methods: such as traditional chemical reduction method, polysaccharide method, Tollens reagent method and radiation method. Chemical reduction method is a relatively common preparation method, but because chemical reagents such as sodium citrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 王小英沈祖广孙润仓
Owner SOUTH CHINA UNIV OF TECH
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