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Method for reducing graphene oxide by using extracellular polymer

An extracellular polymer, graphene technology, applied in the direction of graphene, chemical instruments and methods, carbon compounds, etc., can solve the problems of high power consumption, corrosiveness, and high equipment requirements, achieve a high degree of reduction, easy to achieve, The effect of simple reduction conditions

Active Publication Date: 2019-09-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used reducing agents include hydrazine hydrate, dimethylhydrazine, phenols, sodium borohydride, sulfur compounds and alcohols, etc. These reducing agents usually have high toxicity and cannot be used on a large scale. For example, hydrazine hydrate is a strong carcinogen. corrosive and explosive
The ultraviolet radiation reduction method not only requires high equipment but also consumes a lot of energy, resulting in high economic costs
The electrochemical reduction method consumes a lot of power and has high operating costs

Method used

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  • Method for reducing graphene oxide by using extracellular polymer
  • Method for reducing graphene oxide by using extracellular polymer
  • Method for reducing graphene oxide by using extracellular polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using the improved Hummer method to synthesize graphite oxide with flake graphite as raw material, weigh a certain quality of graphite oxide, disperse it in deionized water with a high-shear dispersing mixer, and use an ultrasonic cell crusher to peel off the graphite oxide, and finally After centrifugation at 4000r / min, the obtained supernatant is graphene oxide suspension with a concentration of about 600mg / L.

[0026] Two sets of graphene oxide suspensions were prepared, and the prepared EPS purified samples were added thereto according to the mass ratio of extracellular polymer: graphene oxide = 1:3, and the pH value of the solution was adjusted to 5.0 with HCl and NaOH. The mixture was sealed and placed in an environment of 25°C, and stirred and reacted under 3600LX light intensity and shading conditions respectively. After 72 hours, it was filtered, and the obtained solid was washed several times with deionized water and then freeze-dried to obtain reduced graphen...

Embodiment 2

[0029] Using the improved Hummer method to synthesize graphite oxide with flake graphite as raw material, weigh a certain quality of graphite oxide, disperse it in deionized water with a high-shear dispersing mixer, and use an ultrasonic cell crusher to peel off the graphite oxide, and finally Centrifuge at 4000r / min, and the obtained supernatant is graphene oxide suspension with a concentration of 300mg / L.

[0030] According to the mass ratio of extracellular polymer:graphene oxide=1:3, the prepared EPS purification sample was added to the graphene oxide suspension, and the pH value of the solution was adjusted to 5.0 with HCl and NaOH. The mixture was sealed and placed in an environment of 25°C, and stirred and reacted under the light intensity of 3600LX. Take samples at 0h, 4h, 8h, 12h, 24h, 48h, and 72h and put them into sealed vials for observation. The results are as follows: figure 2 shown. figure 2 It is shown that the color of the reaction solution deepens with th...

Embodiment 3

[0032] Using the improved Hummer method to synthesize graphite oxide with flake graphite as raw material, weigh a certain quality of graphite oxide, disperse it in deionized water with a high-shear dispersing mixer, and use an ultrasonic cell crusher to peel off the graphite oxide, and finally Centrifuge at 4000r / min, and the obtained supernatant is graphene oxide suspension with a concentration of 300mg / L.

[0033]According to the mass ratio of extracellular polymer: graphene oxide=1:1.5, 1:3, 1:6, 1:12, add the prepared EPS purified sample into the graphene oxide suspension respectively (wherein the blank group does not add EPS), adjust the pH value of the solution to 5.0 with HCl, NaOH. The mixture was sealed and placed in an environment of 25°C, and stirred and reacted under the light intensity of 3600LX. After 72 hours, the samples were put into a sealed vial for observation, and the results were as follows: image 3 shown. image 3 It was shown that different concentr...

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Abstract

The invention relates to a method for reducing graphene oxide by using an extracellular polymer. The method comprises the following steps: a target strain is separated and screened from nature firstly, and then is cultured to produce a large amount of the extracellular polymer, the collected and purified extracellular polymer is added to a graphene oxide suspension, the obtained solution is adjusted to be acidic, the solution is illuminated to carry out a reduction reaction, and finally the obtained reaction product is separated and dried to obtain reduced graphene oxide. The method has the advantages of well-sourced, cheap and easily available dependent reducing agent, easily met reaction conditions, high reducing degree of the graphene oxide, low cost, and easiness in industrialization.

Description

technical field [0001] The invention relates to the technical field of carbon materials, in particular to a method for reducing graphene oxide by using extracellular polymers. Background technique [0002] Graphene is a two-dimensional carbonaceous material composed of a single layer of carbon atoms tightly packed. Based on the ideal lattice structure and unique electrical, optical, mechanical, thermal and other properties, graphene has broad application prospects in the fields of electronic devices, biological and chemical sensors, energy storage devices and composite materials. Graphene is easy to agglomerate and difficult to disperse, so it usually needs to be surface modified to make graphene oxide. Graphene oxide (GO) has a large number of oxygen-containing groups and is almost non-conductive, which limits its application in electronic devices. To restore its conductivity, graphene oxide must be reduced. [0003] Traditional graphene oxide reduction methods mainly inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/198
CPCC01B32/184C01B32/198
Inventor 夏令黄诗轶宋少先
Owner WUHAN UNIV OF TECH
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