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Preparing graphene oxide by using a Fenton reagent

A Fenton reagent and fossil technology, applied in the field of graphene, can solve the problems of conjugated structure damage, high cost and high risk, and achieve the effects of mild reaction conditions, fast reaction speed and simple equipment

Inactive Publication Date: 2018-12-18
嘉兴烯成新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hummer and other methods have used strong acids such as concentrated sulfuric acid, perchloric acid, concentrated nitric acid and strong oxidants such as potassium permanganate, which makes the preparation process dangerous, serious pollution, high cost, and the preparation process is loaded down with trivial details and low efficiency.
The conjugated structure of graphene prepared by the Hummers method is greatly damaged, which seriously affects its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Described a kind of Fenton's reagent prepares graphene oxide method, and step is as follows:

[0020] (1) Raw material pretreatment: After mixing 1 g flake graphite and aqueous solution evenly, adjust the system pH=4, raise the temperature to 85°C and react for 1 hour to obtain an acidic mixture;

[0021] (2) Oxidation: Cool the acidic mixture to 60°C, add Fenton's reagent and aqueous solution, and react in a water bath for 2 hours to obtain a graphite oxide solution. The Fenton's reagent: H 2 o 2 with FeSO 4 The mass difference is 8:1;

[0022] (3) Washing: Centrifuge and wash the graphite oxide solution to neutrality;

[0023] (4) Ultrasound: Dilute the solution obtained in step (3) to a concentration of 1 g / L, sonicate for 1.5 h, and freeze-dry to obtain a graphene oxide product.

Embodiment 2

[0025] Described a kind of Fenton's reagent prepares graphene oxide method, and step is as follows:

[0026] (1) Raw material pretreatment: After mixing 1 g of expanded graphite and aqueous solution evenly, adjust the pH of the system to 3, raise the temperature to 80°C for 1.5 h, and obtain an acidic mixture;

[0027] (2) Oxidation: Cool the acid mixture to 70°C, add Fenton's reagent and aqueous solution, and react in a water bath for 8 hours to obtain a graphite oxide solution. The Fenton's reagent: H 2 o 2 with FeSO 4 The quality difference is 8:1.5;

[0028] (3) Washing: Centrifuge and wash the graphite oxide solution to neutrality;

[0029] (4) Ultrasound: The solution obtained in step (3) was diluted to a concentration of 1.5 g / L, ultrasonicated for 5 h, and freeze-dried to obtain a graphene oxide product.

Embodiment 3

[0031] Described a kind of Fenton's reagent prepares graphene oxide method, and step is as follows:

[0032] (1) Raw material pretreatment: After mixing 1 g of pre-oxidized graphite and aqueous solution evenly, adjust the pH of the system to 5, raise the temperature to 90°C for 2 hours, and obtain an acidic mixture;

[0033] (2) Oxidation: Cool the acidic mixture to 50°C, add Fenton's reagent and aqueous solution, and react in a water bath for 24 hours to obtain a graphite oxide solution. The Fenton's reagent: H 2 o 2 with FeSO 4 The mass difference is 10:1;

[0034] (3) Washing: Centrifuge and wash the graphite oxide solution to neutrality;

[0035] (4) Ultrasound: Dilute the solution obtained in step (3) to a concentration of 0.5 g / L, sonicate for 2 h, and freeze-dry to obtain a graphene oxide product.

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Abstract

The invention belongs to the technical field of graphene, and in particular relates to a method for preparing graphene oxide. The method for preparing graphene oxide by using a Fenton reagent providedby the invention comprises the following specific steps: (1) pretreatment of raw materials: after uniformly mixing graphite and an aqueous solution, adjusting the pH value of the system, and heatingto obtain an acidic mixture; (2) oxidation: after cooling the acidic mixture, adding theFenton reagent and the aqueous solution for reaction, so as to obtain a graphite oxide solution; (3) washing with water: centrifuging, washing the graphite oxide solution until that the solution is neutral; (4) superultrasound: diluting the solution obtained in the step (3), then being subjected to superultrasound, and freezeing and drying to obtain a graphene oxide product. The preparation method of the graphene oxide according toprovided by the invention is simple in operation, mild in condition and non-pollution, and the prepared graphene oxide has a high single layer rate.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene oxide with Fenton's reagent. technical background [0002] Graphene is made of carbon atoms with sp 2 A honeycomb planar film composed of a hybrid form, a quasi-two-dimensional material with only one atomic layer thickness, also known as monoatomic layer graphite. The structural characteristics of graphene make it have good strength, flexibility, electrical conductivity, thermal conductivity, optical and other properties, and it is widely used in various fields. Graphene oxide is the oxide of graphene, which has a high specific surface area and abundant functional groups on the surface. At present, the method for preparing graphene oxide by Fenton reagent is mainly the improved Hummer method and the like. Hummer and other methods have used strong acids such as concentrated sulfuric acid, perchloric acid, concentrated nitric acid and strong oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198
CPCC01B32/198
Inventor 叶鹏倪华钢秦存琪王梅
Owner 嘉兴烯成新材料有限公司
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