Eco-friendly safe reducing agent-based graphene and its preparation and application

A graphene and reducing agent technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as human health hazards, high cytotoxicity, and environmental pollution, and meet the requirements of production and application, biocompatibility Good performance and strong operability

Inactive Publication Date: 2017-04-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the oxidation-reduction method, the most commonly used and effective hydrazine reducing agents (hydrazine hydrate, pure hydrazine, dimethylhydrazine, etc.) are highly toxic and explosive
Their cytotoxicity is high, which will cause great harm to human health, and a large amount of use will cause serious pollution to the environment

Method used

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  • Eco-friendly safe reducing agent-based graphene and its preparation and application
  • Eco-friendly safe reducing agent-based graphene and its preparation and application
  • Eco-friendly safe reducing agent-based graphene and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 1 g graphite powder and 0.5 g NaNO 3 , slowly add 23 mL of concentrated sulfuric acid to it under the condition of ice-water bath, stir for 30 minutes to make it fully mixed, and make sure that the temperature of the reaction system is not higher than 5°C. 3 g KMnO 4 Slowly add to the reaction system in batches, the feeding process is controlled at about 30 min, the reaction temperature is controlled at 10-15 °C, and the reaction is continued for 1.5 h after the feeding is completed. Then the ice-water bath was removed, and the stirring reaction was continued for 2 h in a constant temperature water bath at 35 °C. Slowly add 100 mL of ultrapure water, and continue to react for 30 min in a constant temperature water bath at 80 °C. Remove the water bath, and slowly add an appropriate amount of hydrogen peroxide while stirring to reduce the excess oxidant until no bubbles are generated. After stirring for 30 min, the layers were separated, and the supernatant was d...

Embodiment 2

[0028] Weigh 1 g graphite powder and 0.5 g NaNO 3 , slowly add 23 mL of concentrated sulfuric acid to it under the condition of ice-water bath, stir for 30 minutes to make it fully mixed, and make sure that the temperature of the reaction system is not higher than 5°C. 3 g KMnO 4 Slowly add to the reaction system in batches, the feeding process is controlled at about 30 min, the reaction temperature is controlled at 10-15 °C, and the reaction is continued for 1.5 h after the feeding is completed. Then the ice-water bath was removed, and the stirring reaction was continued for 2 h in a constant temperature water bath at 35 °C. Slowly add 100 mL of ultrapure water, and continue to react for 30 min in a constant temperature water bath at 80 °C. Remove the water bath, and slowly add an appropriate amount of hydrogen peroxide while stirring to reduce the excess oxidant until no bubbles are generated. After stirring for 30 min, the layers were separated, and the supernatant was d...

Embodiment 3

[0031] Weigh 1 g graphite powder and 0.5 g NaNO 3 , slowly add 23 mL of concentrated sulfuric acid to it under the condition of ice-water bath, stir for 30 minutes to make it fully mixed, and make sure that the temperature of the reaction system is not higher than 5°C. 3 g KMnO 4 Slowly add to the reaction system in batches, the feeding process is controlled at about 30 min, the reaction temperature is controlled at 10-15 °C, and the reaction is continued for 1.5 h after the feeding is completed. Then the ice-water bath was removed, and the stirring reaction was continued for 2 h in a constant temperature water bath at 35 °C. Slowly add 100 mL of ultrapure water, and continue to react for 30 min in a constant temperature water bath at 80 °C. Remove the water bath, and slowly add an appropriate amount of hydrogen peroxide while stirring to reduce the excess oxidant until no bubbles are generated. After stirring for 30 min, the layers were separated, and the supernatant was d...

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Abstract

The invention relates to eco-friendly safe reducing agent-based graphene and its preparation method and application. The preparation method comprises preparation of graphite oxide and preparation of graphene. The preparation method comprises preparing graphite oxide from natural graphite as a raw material by a Hummers method using concentrated sulfuric acid (H2SO4), sodium nitrate (NaNO3) and potassium permanganate (KMnO4) as oxidants, carrying out ultrasonic dispersion to strip the graphite oxide so that a stable graphite oxide dispersion liquid is obtained, and reducing the graphite oxide at the room temperature through L-ascorbic acid as a reducing agent and ammonium hydroxide as a stabilizer so that graphene is obtained, wherein through control of graphite oxide reduction reaction time and a ratio relationship of graphite oxide and L-ascorbic acid, different graphene materials are obtained. The method has the characteristics of simple and safe system, good biocompatibility and stable product physical and chemical properties. The product prepared by the method can meet the needs of biomedical application.

Description

technical field [0001] The invention relates to a graphene based on a green and safe reducing agent and its preparation and application, in particular to a method of using L-ascorbic acid as a reducing agent to reduce graphite oxide prepared by the Hummers method at room temperature to prepare graphene. The invention belongs to the field of nano material preparation and biomedicine. Background technique [0002] Graphene is a two-dimensional honeycomb crystal structure formed by close packing of single-layer carbon atoms, and is currently the most ideal two-dimensional nanomaterial. In 2004, Geim and Novoselov's research team at the University of Manchester in the United Kingdom prepared single-layer or thin-layer graphene by mechanical exfoliation for the first time (Science, 2004, 306: 666), for which they won the 2010 Nobel Prize in Physics. Due to its unique two-dimensional crystal structure and excellent electromagnetic, optical, mechanical, thermal and other propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/192
CPCC01P2004/03
Inventor 何丹农叶恺王萍金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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