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Preparation method of graphene/active carbon/titanium dioxide composite porous microspheres

A technology of titanium dioxide and porous microspheres, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve problems such as difficulty in utilizing the high specific surface area of ​​graphene, and achieve low density and stability. Good, high porosity effect

Inactive Publication Date: 2017-08-18
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to use the high specific surface area of ​​graphene itself by simply mixing it, and it is more promising to explore new composite methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) 0.1 part of acidified titanium dioxide nanoparticles and 1 part of starch are added to water to form a solution, and mixed with 1 part of graphene oxide aqueous solution to obtain a composite aqueous solution;

[0027] (2) add 10 parts of potassium hydroxide to the composite aqueous solution obtained in step (1), adjust the pH of the solution to more than 10, and continuously stir to obtain the dispersion of graphene oxide wrapped carbohydrates;

[0028] (3) Atomizing and drying the dispersion obtained in step (2) to obtain a composite powder, and the atomization temperature is 130°C.

[0029] (4) The composite powder obtained in step (3) was carbonized at 500° C. for 2 hours, activated at 900° C. for 1 hour, and washed to obtain graphene / activated carbon / titanium dioxide composite porous microspheres.

[0030] Through the above steps, the obtained graphene / activated carbon / titanium dioxide composite porous microspheres are black fluffy powder with a density of 0.23...

Embodiment 2

[0032] (1) 0.1 part of acidified titanium dioxide nanoparticles and 5 parts of starch are added to water to form a solution, which is mixed with 1 part of graphene oxide aqueous solution to obtain a composite aqueous solution;

[0033] (2) add 15 parts of potassium hydroxide to the composite aqueous solution obtained in step (1), adjust the pH of the solution to more than 10, and continuously stir to obtain the dispersion of graphene oxide wrapped carbohydrates;

[0034] (3) Atomizing and drying the dispersion obtained in step (2) to obtain a composite powder, and the atomization temperature is 130°C.

[0035] (4) The composite powder obtained in step (3) was carbonized at 500° C. for 2 hours, activated at 500° C. for 4 hours, and washed to obtain graphene / activated carbon / titanium dioxide composite porous microspheres.

[0036] Through the above steps, the obtained graphene / activated carbon / titanium dioxide composite porous microspheres are black fluffy powder with a density ...

Embodiment 3

[0038] (1) 0.1 part of acidified titanium dioxide nanoparticles and 10 parts of starch are added to water to form a solution, and mixed with 1 part of graphene oxide aqueous solution to obtain a composite aqueous solution;

[0039] (2) add 25 parts of potassium hydroxide to the composite aqueous solution obtained in step (1), adjust the pH of the solution to more than 10, and continuously stir to obtain the dispersion of graphene oxide-wrapped carbohydrates;

[0040] (3) Atomizing and drying the dispersion obtained in step (2) to obtain a composite powder, and the atomization temperature is 130°C.

[0041](4) The composite powder obtained in step (3) was carbonized at 500° C. for 1 h, activated at 800° C. for 2 h, and washed to obtain graphene / activated carbon / titanium dioxide composite porous microspheres.

[0042] Through the above steps, the obtained graphene / activated carbon / titanium dioxide composite porous microspheres are black fluffy powders with a density of 0.45g / cm ...

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Abstract

The invention discloses a preparation method of graphene / active carbon / titanium dioxide composite porous microspheres. The preparation method comprises the following steps: firstly uniformly mixing a carbohydrate aqueous solution containing acidified titanium dioxide nano particles with a graphene oxide aqueous solution, adding potassium hydroxide, stirring to obtain a mixed dispersion, then atomizing and drying to obtain composite powder, and carbonizing and activating to obtain the porous microspheres. In the carbonization process, the carbohydrate forms porous and loose active carbon, groups on a graphene oxide sheet are fallen off so as to lead to the expansion of the graphene oxide microspheres, and the groups on the titanium dioxide nano particles are removed to collectively form the microporous microspheres. By virtue of further activation and pore-forming, the hole structure is richer. The graphene / active carbon / titanium dioxide composite porous microspheres obtained by the invention have large specific surface area and porous volume and low density, can efficiently adsorb and decompose harmful gases such as formaldehyde, and has an application prospect in the fields such as air purification and water treatment.

Description

technical field [0001] The invention belongs to the field of graphene materials, and relates to a preparation method of graphene / activated carbon / titanium dioxide composite porous microspheres. Background technique [0002] Formaldehyde is a systemic toxicant and was identified as a Category 1 carcinogen in 2006. Formaldehyde, which causes harm to the human body in life, can be said to be everywhere. The items involved include furniture, wooden floors; children's clothing, non-iron shirts; fast-food noodles, rice noodles; blistered squid, sea cucumbers, beef louver, shrimp; and even cars. At present, various methods have been adopted at home and abroad to control indoor formaldehyde pollution. These purification technologies are summarized as follows: adsorption technology, photocatalysis technology, air anion technology, chemical neutralization technology, ozone oxidation technology, biotechnology, room temperature catalytic oxidation technology, etc. Each of these techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/06B01J20/28B01J20/30B01D53/02
CPCB01J20/20B01D53/02B01J20/06B01J20/28021
Inventor 高超陈琛韩燚
Owner HANGZHOU GAOXI TECH CO LTD
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