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Method for utilizing sodium alginate to compound nanogold in environment-friendly mode

A technology of sodium alginate and green synthesis, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as increasing industrialization costs and limiting the scope of industrialization of nano-gold, and achieves Low industrial cost, easy operation, high repeatability and reproducibility

Inactive Publication Date: 2014-05-14
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent reacts under high temperature and high pressure, and uses industrial-grade polyacrylic acid as a reducing agent, which increases the cost of industrialization. In addition, the nano-gold particles prepared by this invention have a large particle size of 100-200nm, which limits the size of the nano-gold particles. The scope of subsequent industrial application of gold
[0005] The present invention utilizes a hydrothermal reaction system to reduce gold ions at room temperature or low temperature by using only reproducible and easily degradable sodium alginate in nature, without using any other reducing agent, and prepares nano-gold with controllable morphology and size. This method is green, energy-saving and environmentally friendly, and there is no relevant report on this aspect at present

Method used

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  • Method for utilizing sodium alginate to compound nanogold in environment-friendly mode
  • Method for utilizing sodium alginate to compound nanogold in environment-friendly mode
  • Method for utilizing sodium alginate to compound nanogold in environment-friendly mode

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Embodiment 1

[0022] A kind of method of utilizing sodium alginate green synthesis nano-gold of the present embodiment, its specific steps are as follows:

[0023] 1) Prepare different concentrations of chloroauric acid solution and sodium alginate solution;

[0024] 2) Mix the chloroauric acid solution with the sodium alginate solution, the concentration of chloroauric acid in the mixture is 10 -4 mol / L, the mass percent concentration of sodium alginate is 0.5%, magnetically stirred, and mixed evenly to obtain a reaction precursor solution;

[0025] 3) The reaction precursor solution described in step 2) was placed in a constant temperature water bath at 20°C for 30 minutes to react, and the resulting product was collected. The obtained nano-gold was pink, and the particle size range was between 5 and 20 nm.

Embodiment 2

[0027] A kind of method of utilizing sodium alginate green synthesis nano-gold of the present embodiment, its specific steps are as follows:

[0028] 1) Prepare different concentrations of chloroauric acid solution and sodium alginate solution;

[0029] 2) Mix the chloroauric acid solution with the sodium alginate solution, the concentration of chloroauric acid in the mixture is 10 -3 mol / L, the mass percent concentration of sodium alginate is 5%, magnetically stirred, and mixed evenly to obtain a reaction precursor solution;

[0030] 3) The reaction precursor solution described in step 2) was placed in a constant temperature water bath at 60°C for 20 minutes to react, and the resulting product was collected. The obtained nano gold was pink, and the particle size range was between 5 and 20 nm.

Embodiment 3

[0032] A kind of method of utilizing sodium alginate green synthesis nano-gold of the present embodiment, its specific steps are as follows:

[0033] 1) Prepare different concentrations of chloroauric acid solution and sodium alginate solution;

[0034] 2) Mix the chloroauric acid solution with the sodium alginate solution, the concentration of chloroauric acid in the mixture is 10 -3 mol / L, the mass percent concentration of sodium alginate is 1%, magnetically stirred, and mixed evenly to obtain a reaction precursor solution;

[0035] 3) The reaction precursor solution described in step 2) was placed in a constant temperature water bath at 60°C for 20 minutes to react, and the resulting product was collected. The obtained nano-gold was purple-red, and the particle size range was distributed between 20 and 60 nm.

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Abstract

The invention relates to a method utilizing sodium alginate to compound nanogold in an environment-friendly mode. The method comprises the steps of preparing chloroauric acid solution and sodium alginate solution, wherein the chloroauric acid solution and the sodium alginate solution are different in concentration; mixing the chloroauric acid solution and the sodium alginate solution, and obtaining pre-reaction drive body solution through magnetic stirring and even mixing, wherein the concentration of the chloroauric acid solution in the mixed solution is 10-2-10-4mol / L, and the mass percent concentration of the sodium alginate solution in the mixed solution is 0.5%-5%; placing the pre-reaction drive body solution obtained in the last step in a constant-temperature water bath pot, wherein the temperature is controlled at 20 DEG C-80 DEG C, the reaction time is controlled in 5-10 minutes, and the grain size of the controllable nanogold is 5-100nm. The method conforms to the advocated green chemistry requirement, uses reproducible biomass resource sodium alginate as reducing agents and stabilizers, does not need introduction of other chemical reagents, and is simple in technology, convenient to operate, and low in energy consumption. Moreover, the obtained nanogold is controllable in shape and size, even in dispersion, free of agglomeration and high in productivity.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterial preparation, and more specifically, the invention relates to a green method for synthesizing nano gold by using sodium alginate. Background technique [0002] Due to their surface effect, quantum size effect, optical effect and other properties, gold nanoparticles and their composites have extensive potential in many aspects such as industrial catalysis, biomedicine, bioanalytical chemistry, food safety rapid detection, optical probes, sensors, etc. Application prospects. At present, the preparation methods of nano gold mainly include physical vapor phase evaporation condensation method, sputtering method, laser high temperature combustion method, mechanical grinding method, electrochemical method, liquid phase chemical reduction method and light induction method. Among them, the liquid-phase chemical reduction method has become the main method for preparing nano-gold at low cost becau...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00
Inventor 李云刘慧宏杨峰
Owner WUHAN TEXTILE UNIV
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