A method for preparing highly dispersed graphene with ionic liquid

A technology of ionic liquid and acidic ionic liquid, which is applied in the field of applied chemistry and chemical engineering, to achieve excellent mass transfer effect, environmental protection in the preparation process, and good dispersion effect

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

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the preparation method of graphene oxide:

[0019] A method for preparing highly dispersed graphene with ionic liquid, comprising the following steps:

[0020] 1) Pretreatment of graphite powder: add 1g of graphite powder into a container containing ionic liquid [BMIM]Cl, and process it for 10 minutes by ultrasonic oscillation with a power of 90w, so that the graphite powder is evenly mixed with the ionic liquid to obtain a mixture;

[0021] 2) Preparation of graphene oxide: add 5% sulfuric acid and 2% potassium permanganate to the mixture, put the reaction container in a water bath to keep warm, and at the same time, use 90w ultrasonic vibration to peel off the graphene, and introduce oxygen from the bottom of the container The ionic liquid is saturated to absorb oxygen, stirred at 100°C for 30 minutes, and centrifuged to obtain a precipitate. The ionic liquid, sulfuric acid and potassium permanganate system can be reused. The precipitate was washed with...

Embodiment 2

[0022] Embodiment 2: the preparation method of graphene oxide:

[0023] A method for preparing highly dispersed graphene with ionic liquid, comprising the following steps:

[0024] 1) Pretreatment of graphite powder: add 1g of graphite powder into the ionic liquid [BMIM] 2 SO 4 In the container, the graphite powder is uniformly mixed with the ionic liquid to obtain a mixture by ultrasonic vibration treatment with a power of 120w for 10 minutes;

[0025] 2) Preparation of graphene oxide: add 5% nitric acid and 3% potassium permanganate to the mixture, put the reaction container in a water bath to keep warm, and at the same time, use 120w ultrasonic vibration treatment to peel off the graphene and remove it from the bottom of the container Oxygen is introduced to saturate the ionic liquid to absorb oxygen, stirred at 100°C for 40 minutes, and centrifuged to obtain a precipitate. The ionic liquid, sulfuric acid and potassium permanganate system can be reused. The precipitate w...

Embodiment 3

[0026] Embodiment 3: the preparation method of graphene oxide:

[0027] A method for preparing highly dispersed graphene with ionic liquid, comprising the following steps:

[0028] 1) Pretreatment of graphite powder: add 1g of graphite powder into the ionic liquid [BMIM] 2 SO 4 In a container, ultrasonic vibration treatment with a power of 150w for 10 minutes, so that the graphite powder is evenly mixed with the ionic liquid to obtain a mixture;

[0029] 2) Preparation of graphene oxide: Add 3% nitric acid, 3% sulfuric acid and 3% potassium permanganate to the mixture, put the reaction vessel in a water bath to keep warm, and at the same time, use ultrasonic treatment with a power of 150w to peel off the graphene . Oxygen is introduced from the bottom of the container to saturate the ionic liquid to absorb oxygen, stir at 100°C for 40 minutes, and centrifuge to obtain a precipitate. The ionic liquid, sulfuric acid and potassium permanganate system can be reused. The precip...

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Abstract

The invention discloses a method using an ionic liquid to prepare graphene oxide, and the method comprises the following steps: 1) preprocessing of graphite powder, and 2) preparation of the graphene oxide. The invention discloses a method using the ionic liquid to prepare high dispersion graphene, and the method comprises the step 1) and step 2), and also comprises preparation of reduction graphene. According to the method, the green environmentally-friendly ionic liquid with good mass transfer effects is used for preparation of the graphene, the obtained graphene is good in dispersion effect and high in dispersion degree in water and solvents. The production technology is low in equipment requirement, the preparation process is environmentally-friendly, can be continuously operated, and can be used in mass production. An ionic liquid preparation system can be recycled, and the method is in accordance with national energy conservation and emissions reduction policies, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technology in the field of applied chemistry and chemical engineering, in particular to a method for preparing highly dispersed graphene with ionic liquid. 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 functions can be developed to meet specific requirements....

Claims

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Application Information

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Patent Type & Authority Patents(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
Owner JIANGSU UNIV OF SCI & TECH
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