Method for fast reducing graphene oxide at normal temperature

A graphene and normal temperature technology, applied in the field of graphene, can solve the problems of long reduction time and high heating energy consumption, and achieve the effect of simple and mild reduction conditions, shortened cycle, rapid and efficient reaction

Pending Publication Date: 2019-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing sodium borohydride reduction graphene oxide process is generally heated to 70-90 ° C for 1-2 hours, so there are problems such as high heating energy consumption and long reduction time.

Method used

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  • Method for fast reducing graphene oxide at normal temperature

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Effect test

Embodiment 1

[0025] A kind of method for fast reducing graphene oxide at normal temperature that embodiment 1 provides, comprises the steps:

[0026] (1) Disperse 100mg graphene oxide (graphene oxide produced by Hummers method) in 100mL deionized water, ultrasonic 30min under 50kHz frequency, obtain suspension, then centrifuge, the speed of centrifugation is 2000rpm, the time of centrifugation is 45min, remove precipitation, obtain graphene oxide colloid (in colloid, the concentration of graphene oxide is 1g / L);

[0027] (2) Add the variable-valence metal compound (ferric chloride used in Example 1) into the graphene oxide colloid described in step (1), dissolve it ultrasonically, and mix uniformly (the concentration of ferric chloride in the system is 0.01mol / L), Then use NaOH to adjust the pH value of the system to 8.0, then add 0.02mol sodium borohydride, stir evenly, and obtain a mixed solution;

[0028] (3) In the stirring state at normal temperature, add 2mol / L hydrochloric acid sol...

Embodiment 2

[0030] A kind of method for fast reducing graphene oxide at normal temperature that embodiment 2 provides, comprises the steps:

[0031] (1) Disperse 100mg graphene oxide (graphene oxide produced by Hummers method) in 100mL deionized water, ultrasonic 30min under 50kHz frequency, obtain suspension, then centrifuge, the speed of centrifugation is 2000rpm, the time of centrifugation is 45min, remove precipitation, obtain graphene oxide colloid (in colloid, the concentration of graphene oxide is 1g / L);

[0032] (2) Add the variable-valence metal compound (the cobalt sulfate used in Example 2) into the graphene oxide colloid described in step (1), ultrasonically dissolve, mix well (the concentration of cobalt sulfate in the system is 0.01mol / L), and then use NaOH adjusted the pH of the system to 8.0, then added 0.02mol sodium borohydride, stirred evenly, and obtained a mixed solution;

[0033] (3) Under stirring at normal temperature, add 1mol / L sulfuric acid solution in the mixe...

Embodiment 3

[0035] A kind of method for fast reducing graphene oxide at normal temperature that embodiment 3 provides, comprises the steps:

[0036] (1) Disperse 100mg graphene oxide (graphene oxide produced by Hummers method) in 100mL deionized water, ultrasonic 30min under 50kHz frequency, obtain suspension, then centrifuge, the speed of centrifugation is 2000rpm, the time of centrifugation is 45min, remove precipitation, obtain graphene oxide colloid (in colloid, the concentration of graphene oxide is 1g / L);

[0037] (2) Add the variable-valence metal compound (nickel chloride used in Example 3) into the graphene oxide colloid described in step (1), ultrasonically dissolve, and mix uniformly (the concentration of nickel chloride in the system is 0.01mol / L), Then use NaOH to adjust the pH value of the system to 8.0, then add 0.02mol sodium borohydride, stir evenly, and obtain a mixed solution;

[0038] (3) In the stirring state at normal temperature, add 2mol / L hydrochloric acid soluti...

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Abstract

The invention provides a method for fast reducing graphene oxide at normal temperature. The method includes the steps of firstly, ultrasonically dispersing the graphene oxide into water, and centrifuging to obtain graphene oxide colloid; secondly, adding a variable-valence metal compound into the graphene oxide colloid to perform ultrasonic dissolving, regulating the pH of the mixed liquid to be not smaller than 8, adding hydroboron, and stirring to obtain uniform mixed liquid; thirdly, adding an acid solution into the mixed liquid obtained in the second step under a normal-temperature stirring condition, regulating system pH to be not larger than 8, allowing drastic reduction reaction to happen at the same time, and performing suction filtration, washing and drying to obtain the reduced graphene oxide after the reaction, wherein the reaction ends when no bubbles are generated in the mixed liquid. The method has the advantages that heating is not needed, special requirements on reaction device are avoided, the method is simple in process flow, the reduction reaction only needs 0.5-10 minutes, and short preparation cycle is achieved.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for reducing graphene oxide with sodium borohydride. Background technique [0002] Graphene has broad application prospects in many fields such as materials, electronics, chemistry, energy, biomedicine, etc. due to its excellent mechanical properties, electrical conductivity, optical and thermal properties, and has also attracted widespread attention and research. However, the large-scale preparation of high-quality graphene at low cost is still a challenge. The commonly used graphene preparation methods include: mechanical exfoliation method, chemical vapor deposition method, solid phase epitaxy growth method and chemical redox method. Although the first three methods can obtain graphene with relatively complete structure and better performance, the raw material graphite required by the chemical redox method is cheap and easy to obtain, the preparation process is simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 孔纲胡珺车淳山朱炎彬
Owner SOUTH CHINA UNIV OF TECH
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