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Preparation method of controllable high-substitution hydroxyl functionalized graphene

A technology with high degree of hydroxyl and high substitution, applied in the field of preparation of functionalized graphene, can solve the problem of low degree of substitution of surface active groups

Inactive Publication Date: 2015-02-25
JINCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degree of substitution of functionalized graphene surface active groups reported in the literature and commercially sold is relatively low, usually less than 5.0 wt%.

Method used

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  • Preparation method of controllable high-substitution hydroxyl functionalized graphene
  • Preparation method of controllable high-substitution hydroxyl functionalized graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Preparation of Graphene Oxide

[0022] Graphene oxide (GO) was prepared by the improved Hummers method. Take 5 g of expanded graphite, add 115 ml of concentrated sulfuric acid to it, place it in an ice bath at 0 °C, and then slowly add 15 g of KMnO 4 . Then the mixture was stirred and reacted at 35 °C for 12 h. After the reaction was completed, 230 ml of deionized water was slowly added to the flask, and the temperature was raised to 98 °C and kept at this temperature for 15 min. Then add 700 ml of deionized water therein for dilution to terminate the reaction. After dilution, 30% concentration of H 2 o 2 (30 ml) was added to the above mixture, and the solution quickly turned bright yellow with bubbles. The mixture was filtered, rinsed with 5% dilute hydrochloric acid aqueous solution (500 ml) to remove metal ions in the graphene aqueous solution, and then washed with 2,000 ml of deionized water to remove excess acid, and the obtained sample was placed in an...

Embodiment 2

[0028] Step 1: Preparation of Graphene Oxide

[0029] Graphene oxide (GO) was prepared by the improved Hummers method. Take 5 g of expanded graphite, add 115 ml of concentrated sulfuric acid to it, place it in an ice bath at 0 °C, and then slowly add 15 g of KMnO 4 . Then the mixture was stirred and reacted at 35 °C for 12 h. After the reaction was completed, 230 ml of deionized water was slowly added to the flask, and the temperature was raised to 98 °C and kept at this temperature for 15 min. Then add 700 ml of deionized water therein for dilution to terminate the reaction. After dilution, 30% concentration of H 2 o 2(30 ml) was added to the above mixture, and the solution quickly turned bright yellow with bubbles. The mixture was filtered, rinsed with 5% dilute hydrochloric acid aqueous solution (500 ml) to remove metal ions in the graphene aqueous solution, and then washed with 2,000 ml of deionized water to remove excess acid, and the obtained sample was placed in an ...

Embodiment 3

[0035] Step 1: Preparation of Graphene Oxide

[0036] Graphene oxide (GO) was prepared by the improved Hummers method. Take 5 g of expanded graphite, add 115 ml of concentrated sulfuric acid to it, place it in an ice bath at 0 °C, and then slowly add 15 g of KMnO 4 . Then the mixture was stirred and reacted at 35 °C for 12 h. After the reaction was completed, 230 ml of deionized water was slowly added to the flask, and the temperature was raised to 98 °C and kept at this temperature for 15 min. Then add 700 ml of deionized water therein for dilution to terminate the reaction. After dilution, 30% concentration of H 2 o 2 (30 ml) was added to the above mixture, and the solution quickly turned bright yellow with bubbles. The mixture was filtered, rinsed with 5% dilute hydrochloric acid aqueous solution (500 ml) to remove metal ions in the graphene aqueous solution, and then washed with 2,000 ml of deionized water to remove excess acid, and the obtained sample was placed in an...

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Abstract

The invention relates to a preparation method and application of controllable high-substitution hydroxyl functionalized graphene. The preparation method of the controllable high-substitution hydroxyl functionalized graphene comprises the following steps: 1) adopting an improved Hummers method to oxidize original graphite by virtue of a strong oxidant, and then, preparing graphene oxide by diluting, washing and drying; 2) dispersing sodium azide and chloroethanol in different solvents, performing substitution reaction at a certain temperature to prepare a hydroxyl azide compound; and 3) at a high temperature, adopting nitrene with relatively high reaction activity to perform functionalization treatment on the graphene oxide to obtain the hydroxyl functionalized graphene. The hydroxyl functionalized graphene obtained by the preparation method disclosed by the invention can be stably dispersed in water and a plurality of organic solvents, has good dispersion stability and extensive use in the fields such as micronanoelectronics, machinery, electric wires and cables and high-performance composite materials.

Description

technical field [0001] The invention relates to a preparation method of functionalized graphene, in particular to a preparation method of controllable high degree of substitution hydroxyl functionalized graphene. Background technique [0002] Graphene is a two-dimensional nanosheet material composed of carbon atoms, which is composed of carbon atoms and sp 2 The planar thin film composed of hybrid hexagonal honeycomb lattice. Graphene has attracted the attention of researchers due to its excellent mechanical properties, thermal conductivity and electrical properties, and has been applied in the fields of electricity, mechanics, biomedicine, catalysis, and environmental protection. Graphene nanosheets are closely combined by van der Waals force and π-π conjugation, so it is difficult to obtain stable single-layer graphite, that is, graphene, which severely limits the application range of graphene. Therefore, the functional modification of graphene is a prerequisite for exp...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 张庆华丰建军原会军王晋孟承向
Owner JINCHENG POWER SUPPLY COMPANY OF STATE GRID SHANXI ELECTRIC POWER
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