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A kind of preparation method of ultra-dispersed porous graphene/nano tio2 composite material

A technology of porous graphene and composite materials, which is applied in the field of preparation of hyperdispersed porous graphene/nano-TiO2 composite materials, can solve problems such as easy agglomeration of graphite sheets, and achieve the effects of low cost and simple process

Active Publication Date: 2020-12-29
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the graphene produced by manufacturers or laboratories still has a graphite structure of more than ten layers, and the synthesized graphene is easily agglomerated into graphite sheets under the influence of van der Waals force or dangling bond interaction.

Method used

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  • A kind of preparation method of ultra-dispersed porous graphene/nano tio2 composite material
  • A kind of preparation method of ultra-dispersed porous graphene/nano tio2 composite material
  • A kind of preparation method of ultra-dispersed porous graphene/nano tio2 composite material

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preparation example Construction

[0028] The embodiment of the present invention relates to a hyperdispersed porous graphene / nano-TiO 2 A method for preparing a composite material, the method comprising the following steps:

[0029] (1) Graphite powder is mixed with sodium nitrate to obtain a mixture.

[0030] (2) In an ice-water bath, slowly add the mixture obtained in step (1) into the concentrated sulfuric acid, stir and mix, then slowly add potassium permanganate, preferably slowly stir for 20 minutes after adding potassium permanganate.

[0031] In one embodiment of the present invention, in step (1) and step (2), the addition ratio of graphite powder, sodium nitrate, concentrated sulfuric acid, potassium permanganate is (1~2g): (1~2g): ( 20~23ml): (2~3g).

[0032] (3) Remove the reaction system obtained in step (2) from the ice-water bath, raise the temperature to 33°C, and keep it warm for 30-30 minutes. This process can be carried out under the condition of oil bath or water bath.

[0033] (4) Add a...

Embodiment 1

[0044] Preparation of hyperdispersed porous graphene / nano-TiO 2 Composite materials, including the following steps:

[0045] (1) 1g of graphite powder is mixed with 1g of sodium nitrate to obtain a mixture.

[0046] (2) In an ice-water bath, slowly add the mixture obtained in step (1) to 20 ml of concentrated sulfuric acid, stir and mix, slowly add 2 g of potassium permanganate, and continue stirring for 20 min.

[0047] (3) The reaction system obtained in step (2) was removed from the ice-water bath, placed in a water bath and heated to 33°C, and kept for 30 minutes.

[0048] (4) Add a hydrogen peroxide solution with a mass concentration of 30% to the reaction system obtained in step (3), and after reacting for 2 hours, no bubbles are generated in the system at this time. The reaction solution was suction-filtered with a microporous membrane, and the precipitate obtained by the suction filtration was washed with deionized water for several times until no sulfate was detecte...

Embodiment 2

[0053] Preparation of hyperdispersed porous graphene / nano-TiO 2 Composite materials, including the following steps:

[0054] (1) 1.3g of graphite powder is mixed with 1.3g of sodium nitrate to obtain a mixture.

[0055] (2) In an ice-water bath, slowly add the mixture obtained in step (1) to 23ml of concentrated sulfuric acid, stir and mix, slowly add 3g of potassium permanganate, and continue stirring for 20min.

[0056] (3) The reaction system obtained in step (2) was removed from the ice-water bath, placed in a water bath and heated to 33°C, and kept for 40 minutes.

[0057] (4) Add a hydrogen peroxide solution with a mass concentration of 30% to the reaction system obtained in step (3), and after reacting for 2 hours, no bubbles are generated in the system at this time. The reaction solution was suction-filtered with a microporous membrane, and the precipitate obtained by the suction filtration was washed with deionized water for several times until no sulfate was detect...

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Abstract

The invention relates to a preparing method of a super-dispersing-type porous graphene / nanometer TiO2 composite material. The method comprises the following steps of adding a mixture obtained by mixing graphite powder and sodium nitrate into concentrated sulfuric acid in an ice-water bath, and adding potassium permanganate after stirring the mixture to be mixed with the concentrated sulfuric acid;then removing a reaction system out of the ice-water bath, raising the temperature to 33 DEG C, and then conducting heat preservation for 30-30 min; adding a hydrogen peroxide solution, conducting suction filtration after the reaction is carried out for 2 h, adding obtained graphene oxide into a mixed solution of ethyl alcohol and water, then adding a TiO2 precursor and a sodium borohydride solution, and conducting suction filtration after an ultrasonic reaction is conducted for 12-24 h to obtain the composite material. The method is simple in process, low in cost and capable of achieving batch production.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a super-dispersed porous graphene / nano-TiO 2 Methods of preparation of composite materials. Background technique [0002] Graphene is the thinnest, hardest, and most powerful new type of nanomaterial with the strongest electrical and thermal conductivity found so far, and the surface of graphene contains more oxidized groups, which can achieve a better composite effect with polymers. After graphene is mixed into epoxy resin as a new type of lubricating material, the friction coefficient of epoxy resin can be reduced, and its strength, toughness, wear resistance and corrosion resistance can be effectively improved. However, due to the interlayer van der Waals force, graphene is easy to agglomerate or even stack, thus losing the advantages of super large specific surface area and two-dimensional structure. Therefore, as a filling material, the exfoliation of graphene ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/22C08K7/24C08G59/06
CPCC08G59/063C08K3/22C08K7/24C08K2003/2241C08K2201/011
Inventor 郭思瑶侯东帅赵铁军王琰帅牟犇
Owner QINGDAO TECHNOLOGICAL UNIVERSITY