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Method for synthesizing shewanella halitios into god nanoparticles and application of gold nanoparticles

A bauhevara, gold nanotechnology, applied in the field of microbial green synthesis of nano-gold catalysts, can solve problems such as limiting the application of anaerobic bacteria

Active Publication Date: 2015-05-06
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially in the process of anaerobic biological reduction of gold, H 2 As an electron donor for this reaction, this greatly limits the application of anaerobic bacteria in the research field of biosynthesis of noble metal Au

Method used

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  • Method for synthesizing shewanella halitios into god nanoparticles and application of gold nanoparticles
  • Method for synthesizing shewanella halitios into god nanoparticles and application of gold nanoparticles
  • Method for synthesizing shewanella halitios into god nanoparticles and application of gold nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0030] Shewanella halitios Z4 cultured to the logarithmic growth phase was collected by centrifugation, washed three times with deionized water to remove possible residual culture medium, and then a bacterial suspension was prepared for use. Take 35mL of bacterial suspension and add it to a 100mL Erlenmeyer flask, add 5mL of HAuCl 4 solution and 5 mL of sodium lactate solution. Add 10 mL of water to make the reaction system 50 mL. The final bacterial concentration was 5.25g / L, the gold ion concentration was 0.5mM, and the sodium lactate concentration was 40mM. The Erlenmeyer flask was placed in a shaker (30° C., 165 rpm) and vibrated for 72 hours to obtain a gold nanometer solution. The color of the solution gradually changed from light yellow to purple. The formation of nano-gold solution was verified by UV-vis spectroscopy, XRD and transmission electron microscopy. The characterization results are as follows Figure 1-3 shown. The gold nanoparticles solution was centri...

Embodiment 2

[0032] The difference between this embodiment and embodiment 1 is that the bacterial concentration is reduced to 0.75g / L. The result of the reaction is severe aggregation, uneven shape and size, and larger particle size distribution than that of Example 1. The transmission electron microscope characterization results are as follows: Figure 4 shown.

Embodiment 3

[0034] The difference between this example and Example 1 is that the concentration of sodium lactate is 60 mM. The reaction yielded spherical gold nanoparticles with a particle size similar to that of Example 1. The transmission electron microscope characterization results are as follows: Figure 5 shown.

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Abstract

The invention discloses a method for synthesizing shewanella halitios into god nanoparticles and application of the gold nanoparticles. The method comprises the following steps that firstly, shewanella halitios Z4 cultivated to a stable period is centrifugally collected, the shewanella halitios Z4 is cleaned by deionized water, and then the shewanella halitios Z4 is prepared into a bacterium suspension; secondly, the bacterium suspension in the step one is added into a chloroauric acid solution, sodium lactate is added as an electron donor, a table concentrator carries out shake cultivation, and a nanogold solution is obtained through the reaction; thirdly, the nanogold solution in the step two is centrifugally collected, and is dried for 12 hours to 36 hours at the temperature of 60 DEG C to 90 DEG C to obtain the gold nanoparticles. According to a green synthesis method, no large type equipment is needed, the method is simple, the condition is moderate, hydrogen does not need to be added as the electron donor, cost is low, and the method is safe. The synthetic gold nanoparticle particles can be used as catalysts to catalyz degradation of nitroaniline, and the method can be applied to removal of environment pollutants.

Description

technical field [0001] The invention belongs to the field of material preparation technology and recycling of waste precious metal resources, and relates to a new method for green synthesis of nano-gold catalyst by microorganisms. Background technique [0002] Due to their pivotal role in modern industry, precious metals are known as the vitamins of modern industrial life, and have become the most important strategic resources in the world after oil. Due to its unique optical, electrical, and catalytic properties, the noble metal Au is widely used in the fields of electricity, optics, biomedicine, and catalytic applications. The wide application of the precious metal gold also produces a large amount of Au-containing waste, mainly including electronic waste, spent catalysts, and gold-containing wastewater generated during the production process. According to statistics, the gold content in 1t of computer LCD screen is 450g / t. In fact, even if the gold content grade of ordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00B01J23/52A62D3/37A62D101/26
Inventor 朱能武操艳兰石超宏吴平霄
Owner SOUTH CHINA UNIV OF TECH
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