Biosynthesis method of nano Ag

A biosynthesis and nanotechnology, applied in the nano field, can solve the problems that will affect the purity and application range of nano-Ag, complex method conditions, impure products, etc. Effect

Inactive Publication Date: 2016-06-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conditions of this method are complicated, and the obtained nano-Ag particles contain a large amount of organic compounds that are difficult to elute, which will affect the purity and application range of nano-Ag
此外,绿茶提取液也被用来制备纳米Ag(SunQ,CaiX,LIJ,etal.Greensynthesisofsilvernanoparticlesusingtealeafextractandevaluationoftheirstabilityandantibacterialactivity[J].ColloidsandSurfacesA:PhysicochemicalandEngineeringAspects,2014,444(226-31.)、(BabuS,ClavilleMO,GhebreyessusK.Rapidsynthesisofhighlystablesilvernanoparticlesanditsapplicationforcolourimetricsensingofcysteine[J ].JournalofExperimentalNanoscience,2015,10(16):1242-55.)、(NadagoudaMN,VarmaRS.Greensynthesisofsilverandpalladiumnanoparticlesatroomtemperatureusingcoffeeandteaextract[J].GreenChemistry,2008,10(8):859.)、(LooYY,ChiengBW,NishibuchiIM,etal.SynthesisofsilvernanoparticlesbyusingtealeafextractfromCamelliasinensis [J].International journal of nanomedicine, 2012, 7(4263-7.), but these synthetic methods all have shortcomings such as impure products, large and uneven particle size, and poor crystallinity

Method used

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  • Biosynthesis method of nano Ag
  • Biosynthesis method of nano Ag
  • Biosynthesis method of nano Ag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Take green tea and ultrapure water at a mass ratio of 1:80, add green tea to ultrapure water at 90°C for 30 minutes, filter, and cool to obtain a green tea extract;

[0019] 2) Take AgNO 3 Crystals were added to ultrapure water to prepare AgNO with a concentration of 0.02mol / L 3 solution, keep it in a dark place for use;

[0020] 3) Mix green tea extract with AgNO 3 The solution was mixed at a volume ratio of 1:30, and magnetically stirred at room temperature to obtain a nano-Ag colloidal solution;

[0021] 4) The nano-Ag colloid solution is centrifuged in a centrifuge at 10000 r / min, the obtained precipitate is repeatedly washed with ultrapure water for 3 to 4 times, and dried at 150° C. for 6 hours to obtain nano-Ag particles.

[0022] figure 1 It is the XRD diffraction pattern of the nano-Ag prepared in this embodiment, as can be seen from the figure at (111), (200), (220), (311) and (222) at 2θ=38.118, 44.304, 64.450, 77.407, 81.550 five places These five crys...

Embodiment 2

[0025] 1) Take green tea and ultrapure water according to the mass ratio of 1:60, add green tea into ultrapure water at 100°C for 10 minutes, filter and cool to obtain green tea extract;

[0026] 2) Take AgNO 3 Crystals were added to ultrapure water to prepare AgNO with a concentration of 0.06mol / L 3 solution, keep it in a dark place for use;

[0027] 3) Mix green tea extract with AgNO 3 The solution was mixed at a volume ratio of 1:20, and magnetically stirred at room temperature to obtain a nano-Ag colloidal solution;

[0028] 4) The nano-Ag colloid solution is centrifuged in a centrifuge at 8000r / min, the obtained precipitate is repeatedly washed with ultrapure water for 3-4 times, and dried at 80° C. for 12 hours to obtain nano-Ag particles.

Embodiment 3

[0030] 1) Take green tea and ultrapure water according to the mass ratio of 1:40, add green tea into ultrapure water at 80°C for 40 minutes, filter and cool to obtain green tea extract;

[0031] 2) Take AgNO 3 Crystals were added to ultrapure water to prepare AgNO with a concentration of 0.08mol / L 3 solution, keep it in a dark place for use;

[0032] 3) Mix green tea extract with AgNO 3 The solution was mixed at a volume ratio of 1:40, and magnetically stirred at room temperature to obtain a nano-Ag colloidal solution;

[0033] 4) The nano-Ag colloid solution is centrifuged in a centrifuge at 5000r / min, the obtained precipitate is repeatedly washed with ultrapure water for 3-4 times, and dried at 100° C. for 8 hours to obtain nano-Ag particles.

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Abstract

A biosynthesis method of nano Ag comprises the following steps: adding green tea in ultra-pure water, heating in water bath and then filtering, and cooling to obtain a green tea extracting solution; adding AgNO3 crystals in the ultra-pure water to obtain an AgNO3 solution, mixing the green tea extracting solution and the AgNO3 solution, and magnetically stirring at room temperature to obtain a nano Ag colloidal solution; and washing precipitate obtained after centrifuging of the nano Ag colloidal solution by using the ultra-pure water, and then drying to obtain nano Ag particles with particle sizes of 5-20 nm. The green tea extracting solution is used as a reducing agent and a dispersing agent, the nano Ag particles are reduced and prepared from a silver nitrate (AgNO3) solution, in order to improve quality of products, the ultra-pure water is used as a solvent, any chemical reagents are not required, conditions are simple and mild, raw materials are easy to obtain, the method is easy and convenient to operate, sizes of the obtained products are uniform, and dispersity is good.

Description

technical field [0001] The invention belongs to the field of nanotechnology and relates to a biosynthesis method of nano Ag. Background technique [0002] Nano-Ag has received extensive attention due to its special physical and chemical properties such as specific surface area effect, small volume effect, quantum effect, catalytic performance and antibacterial performance (ReutherR. :8-10.). In recent years, with the in-depth study of synthesis methods, the prepared nano-Ag materials have gradually been widely used in food, medical and other industries (AnjumS, SharmaA, TummalapalliM, et al. A Novel Route for the Preparation of Silver Loaded Polyvinyl Alcohol Nanogels for Wound Care Systems [J]. (17):894-905.). Therefore, green and harmless synthetic methods have become a research hotspot. Methods for synthesizing nano-Ag include physical, chemical and biological methods. The physical method requires high equipment and harsh conditions, and it is difficult to expand the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/054
Inventor 杨辉任雁宇
Owner SHAANXI UNIV OF SCI & TECH
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