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Method for preparing graphene/silver/titanium dioxide composite material

A composite material, titanium dioxide technology, applied in the fields of botanical equipment and methods, chemicals for biological control, animal repellants, etc., can solve problems such as complex use effects

Inactive Publication Date: 2015-04-01
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequently, a series of graphene / silver nanocomposite antibacterial materials with good antibacterial properties appeared. The research found that the preparation process of such materials has certain complexity or the use effect has certain limitations.

Method used

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  • Method for preparing graphene/silver/titanium dioxide composite material
  • Method for preparing graphene/silver/titanium dioxide composite material
  • Method for preparing graphene/silver/titanium dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 1g of graphene flakes and 2g of PVP powder, transfer the two powders into a three-hole flask, then measure 200 ml of deionized water, ultrasonically disperse in a 200 W ultrasonic cleaning machine, and adjust the mechanical stirrer The rotation speed is 200 rpm, and the ultrasonic wave is about 40 min to obtain a stable aqueous solution of graphene sheets. figure 1 is the SEM image of the graphene sheet in the experiment, figure 2 is a TEM image of a graphene sheet.

[0029] (2) Weigh 1g of silver nitrate powder and add it to the graphene sheet solution in (1), fix the three-hole flask in a constant temperature oil bath, raise the temperature to 82°C and keep the temperature constant for 10 minutes, and adjust the speed of the mixer to 150 rpm , and then measure about 3 ml of hydrated N 2 h 4 Put the solution in a constant pressure funnel, adjust the dripping speed to 0.5 drops / second, and wait for the hydrated N 2 h 4 After the solution was added dropwi...

Embodiment 2

[0032] (1) Weigh 1.5 g of graphene flakes and 2 g of SDS powder, transfer the two powders into a three-hole flask, then measure 150 ml of deionized water, ultrasonically disperse them in a 200 W ultrasonic cleaning machine, and adjust The rotation speed of the mechanical stirrer was 200 rpm, and a stable aqueous solution of graphene sheets was obtained by ultrasonication for about 30 min.

[0033] (2) Weigh 1g of silver nitrate powder and add it to the graphene sheet solution in (1), fix the three-hole flask in a constant temperature oil bath, raise the temperature to 85°C and keep the temperature constant for 10 minutes, and adjust the speed of the mixer to 150 rpm , and then measure about 2.5 ml of NaBH 4 Put the aqueous solution in a constant pressure funnel, adjust the dripping speed to 0.5 drops / second, and wait for the NaBH to be hydrated 4 After the aqueous solution was added dropwise, the temperature was kept at the reaction temperature for 2 hours to obtain a uniform...

Embodiment 3

[0036] (1) Weigh 2 g of graphene flakes and 2 g of PVP powder, transfer the two powders into a three-hole flask, then measure 300 ml of deionized water, ultrasonically disperse them in a 250 W ultrasonic cleaning machine, and adjust The rotation speed of the mechanical stirrer was 250 rpm, and a stable aqueous solution of graphene sheets was obtained by ultrasonication for about 25 min.

[0037] (2) Weigh 1.5 g of silver nitrate powder and add it to the graphene sheet solution in (1), fix the three-hole flask in a constant temperature oil bath, raise the temperature to 80°C and keep the temperature constant for 10 minutes, and adjust the speed of the mixer to 150 rpm, then measure about 5 ml of vitamin C aqueous solution in the constant pressure funnel, adjust the dripping speed to 1 drop / second, after the hydrated vitamin C aqueous solution is added dropwise, keep the temperature at the reaction temperature for 3 hours to obtain uniform graphite olefin / silver composite soluti...

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Abstract

The invention discloses a method for preparing a graphene / silver / titanium dioxide composite material. The method comprises the following steps: (1) weighing graphene sheets; (2) dispersing the graphene sheets weighed in the step (1) into an aqueous solution of a proper amount of surfactants (PVP or SDS), and performing ultrasonic dispersion; (3) adding silver nitrate in a calculated amount into the graphene sheet solution treated in the step (2), preserving the constant temperature in an oil bath pan, dripping a reducing agent (N2H4, NaBH4 or vitamin C) in a corresponding calculated amount, and preserving the constant temperature for a period of time, thereby obtaining a graphene / silver composite material solution; and (4) heating the graphene / silver composite material solution prepared in the step (3) to another temperature, preserving the constant temperature for a certain time, slowly adding a chlorotitanate solution (TiCl3 or TiCl4) of a calculated amount, and performing suction filtration, washing, vacuum drying treatment, thereby obtaining the graphene / silver / titanium dioxide composite material powder. The method is simple in preparation process and easy to popularize and apply.

Description

technical field [0001] The invention belongs to the field of preparation of carbon composite materials, and in particular relates to a preparation technology of graphene / silver / titanium dioxide composite materials. Background technique [0002] Graphene is a SP 2 Hybrid carbon material with a honeycomb shape, the thickness of single-layer graphene is only 0.334nm, which is the thinnest material known so far. Graphene has a super large specific surface area of ​​about 2600m 2 / g, such a large specific surface area makes graphene materials have become the first choice for energy storage materials. It has been found in previous studies that it can be applied to hydrogen storage, supercapacitors or fuel cells; at the same time, in view of its ultra-high specific surface area characteristics , graphene materials have also been widely studied in environmental adsorption and air purification; and because graphene materials themselves are very stable, they are usually selected as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01P1/00A01P3/00
CPCA01N59/16
Inventor 吕树申符远翔莫冬传
Owner SUN YAT SEN UNIV
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