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A method for preparing nano-gold with a size less than 5nm by using banana pulp extract

A banana pulp and extract technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as the lack of sodium hydroxide to control the reaction process, and achieve reduction of preparation costs and dispersion Good performance and good stability

Active Publication Date: 2018-07-03
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no research to obtain uniformly distributed gold nanoparticles with a particle size of less than 5nm by green preparation methods, and there is no relevant research result on the role of sodium hydroxide in controlling the reaction process during the preparation of nano-gold

Method used

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  • A method for preparing nano-gold with a size less than 5nm by using banana pulp extract
  • A method for preparing nano-gold with a size less than 5nm by using banana pulp extract
  • A method for preparing nano-gold with a size less than 5nm by using banana pulp extract

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Experimental program
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Effect test

Embodiment 1

[0029] Add 0.75mL 2mmol / L gold chlorate aqueous solution to 1.91mL deionized water, then stir the solution and 0.2mL banana pulp extract in a boiling water bath and preheat to 96-100°C, extract the preheated banana pulp Add the preheated gold chlorate aqueous solution, continue to stir and heat in the boiling water bath for 5 seconds, then quickly add 0.14mL 0.2mol / L sodium hydroxide aqueous solution, and heat and stir in the boiling water bath for 5 minutes to obtain a particle size of 2.0±0.5nm spherical gold nanoparticle solution 3.00mL (see figure 1 ).

[0030] After the prepared nano-gold particle solution was left at room temperature for 3 months, the particle size and distribution of the nano-gold particles in the solution were characterized by a transmission electron microscope. The results are shown in figure 2 . It can be seen from the figure that the 2.0±0.5nm gold nano-particles prepared by the method of the present invention have good stability, and still maint...

Embodiment 2

[0033]Add 0.75mL 2mmol / L gold chlorate aqueous solution to 2.03mL deionized water, then stir the solution and 0.2mL banana pulp extract respectively in a boiling water bath and preheat to 96-100°C, then put the preheated banana pulp Add the extract to the preheated gold chlorate aqueous solution, continue stirring and heating in the boiling water bath for 5 seconds, then quickly add 0.02mL 0.2mol / L sodium hydroxide aqueous solution, and heat and stir in the boiling water bath for 5 minutes to obtain the particle size 3.00mL of spherical gold nanoparticle solution of 3.1±1.3nm (see Figure 4 ).

[0034] After the prepared nano-gold particle solution was left at room temperature for 3 months, the particle size and distribution of the nano-gold particles in the solution were characterized by a transmission electron microscope. The results are shown in Figure 5 . It can be seen from the figure that the 3.1±1.3nm gold nano-particles prepared by the method of the present inventio...

Embodiment 3

[0037] Add 0.75mL 2mmol / L gold chlorate aqueous solution to 2.01mL deionized water, then stir the solution and 0.2mL banana pulp extract respectively in a boiling water bath and preheat to 96-100°C, then put the preheated banana pulp Add the extract to the preheated gold chlorate aqueous solution, continue stirring and heating in the boiling water bath for 5 seconds, then quickly add 0.04mL 0.2mol / L sodium hydroxide aqueous solution, and heat and stir in the boiling water bath for 5 minutes to obtain the particle size 3.00mL of spherical gold nanoparticle solution of 2.6±0.8nm (see Figure 7 ).

[0038] After the prepared nano-gold particle solution was left at room temperature for 3 months, the particle size and distribution of the nano-gold particles in the solution were characterized by a transmission electron microscope. The results are shown in Figure 8 . It can be seen from the figure that the 2.6±0.8nm gold nano-particles prepared by the method of the present inventi...

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Abstract

The invention discloses a method for preparing nano-gold with a size less than 5nm by using banana pulp extract. The method uses the banana pulp extract as a reducing agent and a stabilizer to reduce gold tetrachlorate, and controls the amount of additive sodium hydroxide in the reaction process. The timing and amount of addition are used to control the reaction process of gold tetrachlorate and reducing agent in a boiling water bath, and then achieve the purpose of controlling the particle size of nano-gold particles, and obtain good dispersion, uniform particle size, and a particle size of 1.5 to 4.9 nm spherical gold nanoparticles solution. The method of the invention has mild conditions, short reaction time, simple operation, low cost, non-toxic and pollution-free reducing agent and additives, and the synthesized nano gold particles have good stability at room temperature and in salt solution, and belong The green synthesis method is suitable for related applications in the fields of medicine and pharmacy.

Description

technical field [0001] The invention relates to a preparation method of nano-gold particles, in particular to a preparation method of green nano-gold particles with a diameter of less than 5 nm. Background technique [0002] Gold nanoparticles have the characteristics of ultra-small particle size and large specific surface area, and have high activity in the fields of electronics, optics, thermochemistry, and catalysts, and have attracted the attention of many disciplines such as physics, chemistry, biology, pharmaceuticals, and materials. Applied research in the disciplines of catalysts, biomarkers, drugs, gene delivery, tissue engineering, and optoelectronics is derived. [0003] Gold nanoparticles, also known as colloidal gold, have become the most widely used type of noble metal nanoparticles due to their stable state, non-toxicity and good biocompatibility, and have attracted many studies aimed at controlling the size and shape of gold nanoparticles. . At present, a v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/07B22F1/065B22F1/054
Inventor 杨博侴菊
Owner XI'AN PETROLEUM UNIVERSITY
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