Method for preparing expanded graphite by using mixed reaction liquid of graphene oxide

A technology of expanded graphite and reaction liquid, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of unfriendly environment, high purification cost, large consumption of pure water, etc., achieve full recovery, reduce emissions, easy-to-handle effects

Pending Publication Date: 2022-05-10
ZHANJIANG JUXIN NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation-reduction method uses natural graphite as raw material to prepare graphene through oxidation, exfoliation, and reduction. In the oxidation process, strong acids and strong oxidants are required. Graphene consumes a large amount of pure water during the purification process and produces a large amount of acid. Wastewater, high purification cost, unfriendly to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Get 7.5 L of graphene oxide semi-finished products prepared by the improved Hummers method, including water, graphene oxide, sulfuric acid and potassium permanganate.

[0045] (2) Dilute the graphene oxide semi-finished product with 10L pure water to obtain the diluted slurry.

[0046] (3) The density of 98% concentrated sulfuric acid is 1.83g / cm 3 Calculated, ignoring the amount of intercalation acid, the mass concentration of sulfuric acid in the mixed reaction solution is calculated to be 56.7%, and the concentration meets 50% to 93%, so the volume of adding 98% concentrated sulfuric acid is 0, that is, no need to add concentrated sulfuric acid.

[0047] (4) Collect the mixed reaction solution containing sulfuric acid and potassium permanganate by suction filtration, 12 L in total.

[0048] (5) Take 100ml of the mixed reaction solution of step (4), and add 1.6ml of hydrogen peroxide dropwise therein until the color of the mixed reaction solution turns yellow, an...

Embodiment 2

[0055] (1) Get 1.4L and adopt the improved Hummers method to prepare graphene oxide semi-finished products, including water, graphene oxide, sulfuric acid and potassium permanganate.

[0056] (2) Dilute the graphene oxide semi-finished product with 2L of pure water to obtain the diluted slurry.

[0057] (3) The density of 98% concentrated sulfuric acid is 1.83g / cm 3 Calculated, ignoring the amount of intercalation acid, the mass concentration of sulfuric acid in the mixed reaction solution is calculated to be 55.2%, and the concentration meets 50%-93%, then the volume of adding 98% concentrated sulfuric acid is 0, that is, no need to add concentrated sulfuric acid.

[0058] (4) Collect the mixed reaction solution containing sulfuric acid and potassium permanganate by suction filtration, 2.5 L in total.

[0059] (5) Take 100ml of the mixed reaction solution, and add 1.3ml of hydrogen peroxide dropwise thereto until the color of the mixed reaction solution turns yellow, and wit...

Embodiment 3

[0067] (1) Get 40L and adopt the improved Hummers method to prepare graphene oxide semi-finished products, including water, graphene oxide, sulfuric acid and potassium permanganate.

[0068] (2) Dilute the graphene oxide semi-finished product with 35L pure water to obtain the diluted slurry.

[0069] (3) The density of 98% concentrated sulfuric acid is 1.83g / cm 3 Calculated, ignoring the amount of intercalation acid, the mass concentration of sulfuric acid in the mixed reaction solution is calculated to be 66.3%, and the concentration meets 50% to 93%, then the volume of adding 98% concentrated sulfuric acid is 0, that is, no need to add concentrated sulfuric acid.

[0070] (4) Collect the mixed reaction solution containing sulfuric acid and potassium permanganate by suction filtration, 50 L in total.

[0071] (5) Take 100ml of the mixed reaction solution, and add 0.4ml of hydrogen peroxide dropwise therein until the color of the mixed reaction solution turns yellow, and with...

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PUM

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Abstract

The invention provides a method for preparing expanded graphite by using a mixed reaction solution of graphene oxide, which comprises the following steps: taking the mixed reaction solution containing strong acid (such as sulfuric acid) and strong oxidant (such as potassium permanganate) in the production of graphene oxide as a raw material for preparing the expanded graphite, and regulating the ratio of the mixed reaction solution to the graphite raw material to prepare the expanded graphite. And setting the temperature and the reaction time suitable for the raw material ratio to prepare the expanded graphite product. According to the method, the strong acid and the strong oxidant in the graphene oxide preparation process are recycled and used for preparing the expanded graphite, purification and impurity removal treatment is not needed in the recycling process, direct recycling of the strong acid and the strong oxidant can be achieved, and the discharge amount of the strong acid and the strong oxidant is reduced; the industrial preparation cost of two graphite deep processing products, namely the graphene oxide and the expanded graphite, can be reduced at the same time, and the method is widely applicable to low-cost industrial production of the graphene oxide and the expanded graphite.

Description

technical field [0001] The invention belongs to the technical field of graphite deep processing, and in particular relates to a method for preparing expanded graphite by using a mixed reaction solution of graphene oxide. Background technique [0002] Graphene is a new type of two-dimensional carbon nanomaterial, and the redox method is currently the main method for industrially preparing graphene. The oxidation-reduction method uses natural graphite as raw material to prepare graphene through oxidation, exfoliation, and reduction. In the oxidation process, strong acids and strong oxidants are required. Graphene consumes a large amount of pure water during the purification process and produces a large amount of acid-containing substances. Wastewater, high cost of purification, not friendly to the environment. Therefore, it is particularly important to recycle strong acids and strong oxidants in the production of graphene oxide. Contents of the invention [0003] Graphene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225
CPCC01B32/225
Inventor 王宪刘明东莫大幸肖玮吴其修
Owner ZHANJIANG JUXIN NEW ENERGY
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