A method for preparing highly dispersed graphene with ionic liquid

An ionic liquid, highly dispersible technology, applied in the field of applied chemistry and biochemical industry, to achieve the effect of large-scale production, excellent mass transfer effect, and low equipment requirements

Inactive Publication Date: 2015-10-07
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ionic liquids are green and environmentally friendly, and there is currently no method for preparing graphene using ionic liquids

Method used

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  • A method for preparing highly dispersed graphene with ionic liquid
  • A method for preparing highly dispersed graphene with ionic liquid
  • A method for preparing highly dispersed graphene with ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0018] Embodiment 1-3: prepare graphene oxide

Embodiment 1

[0019] Example 1: 1g of graphite powder was added to a container containing 100g of 1-butylimidazolium chloride ([BMIM]Cl) ionic liquid, and treated with 90w ultrasonic vibration for 30min to mix the graphite powder evenly in the ionic liquid. Then add 5g of 96% sulfuric acid and 2g of potassium permanganate, and put the reaction vessel into a water bath at 90°C for 50min, and simultaneously use 90w ultrasonic vibration for 30min to peel off the graphite layer by layer to obtain graphene, see e.g. figure 1 , what is obtained at this time is a suspension in which graphite is dispersed in the above-mentioned ionic liquid. Then, oxygen was introduced from the bottom of the container to saturate the ionic liquid to absorb oxygen, and the mixture was stirred at 100° C. for 30 minutes. The mixture of ionic liquid, graphene oxide, acid and potassium permanganate was centrifuged at 10000r / min for 20min to precipitate graphene. The mixed solution of acidic ionic liquid, acid and potas...

Embodiment 2

[0020] Embodiment 2: 5g graphite powder is added and is equipped with 100g ionic liquid [BMIM] 2 SO 4 In the container, 100w ultrasonic vibration treatment for 20min, so that the graphite powder is evenly mixed in the ionic liquid. Then add 10g of nitric acid with a concentration of 95% and 6g of potassium permanganate, and put the reaction vessel in a water bath at 120°C for 30 minutes, and at the same time use 100w ultrasonic vibration for 20 minutes to peel off the graphite layer by layer to obtain graphene. Then, oxygen was introduced from the bottom of the container to saturate the ionic liquid to absorb oxygen, and the mixture was stirred at 100° C. for 40 minutes. The mixture of ionic liquid, graphene oxide, acid and potassium permanganate was centrifuged at 12000r / min for 20min to precipitate graphene. The mixed solution of acidic ionic liquid, acid and potassium permanganate in the upper layer can be reused for the preparation of graphene oxide. The precipitate was...

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Abstract

The invention discloses a method for preparing high-dispersity graphene by using ionic liquid. The method comprises the following steps: 1, preparing graphene oxide, namely adding graphite powder to acid ionic liquid, and carrying out ultrasonic oscillation pretreatment, adding acid and potassium permanganate, carrying out ultrasonic oscillation, leading in oxygen so that the ionic liquid absorbs oxygen, heating and stirring, centrifuging to obtain precipitate, and processing the precipitate, so as to obtain graphene oxide; 2, preparing reduced graphene, namely adding water to graphene oxide, carrying out ultrasonic oscillation, adding basic ionic liquid and hydrazine hydrate, heating and reacting, then cooling reaction liquid, centrifugally separating to obtain precipitate, and processing the precipitate to obtain reduced graphene. The method has the advantages that graphene prepared by using green and environment-friendly ionic liquid with an excellent mass transfer effect is good in dispersion effect, and high in dispersion coefficient in water and a solvent, the preparation process is green and environment-friendly, large-scale production can be achieved, and the ionic liquid of the reaction system can be recycled. Thus, energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing highly dispersed graphene with ionic liquid, which belongs to the technology in the fields of applied chemistry and biochemical industry. Background technique [0002] Ionic liquids are a class of organic salts that are composed of organic cations and organic or inorganic anions, and are in a liquid state at room temperature or near room temperature. As a new environmentally friendly green solvent, ionic liquids have good thermal stability, strong solubility, non-volatility, low melting point, wide electrochemical window, good electrical and thermal conductivity, good light transmission and high Refractive index, high heat capacity, high stability. Moreover, ionic liquids are also designable. By adjusting and changing the structure and composition of anions and cations, the performance of ionic liquids can be improved and ionic liquids with special functi...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor李强季更生冯圆圆屠洁唐玉斌李天程李斌
OwnerJIANGSU UNIV OF SCI & TECH