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Environmentally-friendly synthetic method for metal nanoparticle

A gold nanoparticle, green synthesis technology, applied in the field of nanomaterials, can solve the problems of limiting the synthesis of nanometer metal particles, the reaction conditions cannot be optimized, and it takes a long time and energy to shorten the reduction reaction time, the synthesis time is short, and the production cost is shortened. low effect

Active Publication Date: 2015-07-08
上海穗杉实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although microbial synthesis is environmentally friendly, it takes a long time and effort to select microorganisms, genetically modify them, and cultivate microorganisms
The separation of nanoparticles after synthesis also requires complex and energy-consuming processes, such as ultrasonic pulverization, centrifugal sedimentation, etc. In addition, due to the presence of living cells, many reaction conditions cannot be optimized, which limits the synthesis of large-scale metal nanoparticles

Method used

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  • Environmentally-friendly synthetic method for metal nanoparticle
  • Environmentally-friendly synthetic method for metal nanoparticle
  • Environmentally-friendly synthetic method for metal nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Synthesis of nano-gold spheres by green method:

[0035] Dissolve 5 grams of sodium chloride, 3 grams of yeast extract, 3 grams of malt extract, 5 grams of tryptone, and 5 grams of glucose in 1 liter of deionized water and stir until dissolved. NaOH was added to the above aqueous solution to adjust the pH to 12. Under the condition of stirring at 500 rpm, an aqueous solution of chloroauric acid was added. After mixing, the concentration of chloroauric acid was 1 mmol / L. The reaction was carried out at room temperature for 24 hours to obtain gold nanospheres.

[0036] figure 1 It is a transmission electron microscope image of nano-gold spheres, and it can be clearly seen that the obtained gold nanoparticles are basically spherical.

[0037] figure 2 The XRD spectrum of the nano-gold sphere is very consistent with the standard spectrum of the nano-gold sphere.

[0038] image 3 It is a 1mM nanometer gold sphere laser particle size distribution diagram. The analysis ...

Embodiment 2

[0040] Synthesis of nano-golden flowers 1 by green method:

[0041] The proportion of materials is the same as that of Example 1, except that the final concentration of adding chloroauric acid aqueous solution is 5.0mmol / L. The obtained nano-gold is like a flower, and the particle size distribution data show that the average particle diameter is 71nm, and the particle size distribution index is 0.15, such as Figure 4 shown.

Embodiment 3

[0043] Synthesis of silver nanospheres by green method:

[0044] Dissolve 5 grams of sodium chloride, 3 grams of yeast extract, 3 grams of malt extract, 5 grams of tryptone, and 10 grams of glucose in 1 liter of deionized water and stir until dissolved. NaOH was added to the above aqueous solution to adjust the pH to 10. Under the stirring condition of 600 rpm, an aqueous solution of silver nitrate was added, and the concentration of silver nitrate after mixing was 1 mmol / L. The reaction was carried out at room temperature for 12 hours to obtain silver nanospheres.

[0045] Different initial concentrations of silver nitrate lead to different sizes of silver nano-solutions, such as Figure 5 shown. When the concentration of silver nitrate after mixing is 2.5mmol / L, the nano-silver laser particle size distribution obtained is as follows: Figure 6 shown.

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Abstract

The invention discloses an environmentally-friendly synthetic method for the metal nanoparticle, and belongs to the field of the nanometer material. The existing ingredients in a microorganism nutrient solution are used as reducing agent, stabilizing agent and morphological control agent to synthetize metal nanometer material in one step. The environmentally-friendly synthetic method for the metal nanoparticle comprises the following steps of: (1) blending a reducing stable morphology control agent solution, and meanwhile, adding sodium chloride or dipotassium phosphate; (2) regulating the pH (potential of hydrogen) value of the solution to 2-13; (3) adding the soluble metal salt water solution of the metal nanoparticle while stirring the solution; and (4) at the temperature of 15-50DEG C, reacting for 5 seconds to 24 hours to obtain the metal nanoparticle. The environmentally-friendly synthetic method for the metal nanoparticle, which is disclosed by the invention, has the moderate reaction condition, short synthesis time and low production cost, the particle diameter of the obtained metal nanoparticle is 1-100nm, the particle diameter of the nanometer material is relatively even, and the morphology of the generated metal nanoparticle can be controlled. Compared with the biosynthesis method, the environmentally-friendly synthetic method for the metal nanoparticle is simpler, efficient and environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of nanometer materials and relates to a green synthesis method of metal nanoparticles. Background technique [0002] Metal nanoparticles have attracted much attention due to their unique optical, magnetic and catalytic properties, and they have increasingly important applications in the fields of biological diagnosis, therapy and sensors. The method of preparing nanoparticles is mainly a chemical method, that is, using a reducing agent to reduce a metal salt in an environment with a dispersant or a stabilizer. The reducing agent mostly adopts NaBH with strong reducing property 4 , hydrazine, hydroxylamine, etc. Commonly used dispersants or stabilizers include polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), sodium dodecyl sulfate (DBS), and thiol molecules or thiol-containing molecules with different chain lengths, but these agents are usually Relates to environmental toxicity and biotoxicity. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 刘少敏刘利红谭小耀孟波
Owner 上海穗杉实业股份有限公司
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