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Gold cluster-titanium dioxide-graphene composite material capable of being used for visible-light efficient sterilization and preparing method and application thereof

A technology of titanium dioxide and composite materials, applied in the field of composite materials, can solve problems such as reducing the antibacterial properties of titanium dioxide, and achieve the effect of reducing the composite rate and improving the antibacterial effect.

Active Publication Date: 2016-11-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since titanium dioxide has a band gap of 3.2eV, it can only be excited by ultraviolet light, and only about 4% of natural light is ultraviolet light; and the excited electrons and holes are prone to recombination, thereby reducing the antibacterial properties of titanium dioxide.

Method used

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  • Gold cluster-titanium dioxide-graphene composite material capable of being used for visible-light efficient sterilization and preparing method and application thereof
  • Gold cluster-titanium dioxide-graphene composite material capable of being used for visible-light efficient sterilization and preparing method and application thereof
  • Gold cluster-titanium dioxide-graphene composite material capable of being used for visible-light efficient sterilization and preparing method and application thereof

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preparation example Construction

[0044] The specific steps of the preparation method of a gold cluster-titanium dioxide-graphene composite material that can be used for efficient visible light sterilization provided by the present invention are as follows:

[0045] 1. Synthesis of glutathione-protected gold clusters:

[0046] (1) Add 75mL of 18.2MΩ Milli-Q ultrapure water into a 250ml round bottom flask, then add 4.125mL of chloroauric acid solution (48.56mM), stir to mix evenly;

[0047](2) Weigh 0.092g of glutathione into the reaction solution, stir for 20min, transfer the reaction to an oil bath, set the temperature at 75°C, stir and reflux for 24h to stop the reaction.

[0048] figure 1 It is a transmission electron micrograph of glutathione-protected gold clusters, which shows that the size of the synthesized gold clusters is 1-2nm.

[0049] 2. Synthesis of graphene:

[0050] (1) Weigh 1g of graphite powder and 0.5g of sodium nitrate into a 250mL round bottom flask, then add 25mL of concentrated sulfu...

Embodiment 1

[0060] Embodiment 1: the mass ratio is the synthesis of 6.4%: 86.6%: 7% gold cluster-titanium dioxide-graphene composite

[0061] (1) Weigh 5mg of graphene powder and add it to a mixed solution of 30mL ultrapure water and 9mL absolute ethanol, and ultrasonically disperse it;

[0062] (2) Take 25mL of the synthesized glutathione-protected gold cluster solution, weigh 0.1g of titanium dioxide powder and stir at room temperature for 5 hours; centrifuge the above solution to obtain a precipitate, wash the precipitate with ultrapure water, repeat 3 times, and place the The powder samples were obtained by drying in a drying oven at 60°C.

[0063] (3) Add the above synthesized gold cluster-titanium dioxide sample to the above graphene dispersion, ultrasonicate for 20 minutes and then stir for 20 minutes at room temperature; Wash the precipitate and repeat 3 times, then place the precipitate in a drying oven at 60°C to dry to obtain a powder sample.

Embodiment 2

[0064] Embodiment 2: the mass ratio is 6.4%: 89.4%: the synthesis of gold cluster-titania-graphene composite material of 4.2%

[0065] (1) Weigh 3mg of graphene powder and add it to a mixed solution of 30mL ultrapure water and 9mL absolute ethanol, and ultrasonically disperse it;

[0066] (2) Take 50mL of the synthesized glutathione-protected gold cluster solution, weigh 0.1g of titanium dioxide powder and stir at room temperature for 5 hours; centrifuge the above solution to obtain a precipitate, wash the precipitate with ultrapure water, repeat 3 times, and place the precipitate in The powder samples were obtained by drying in a drying oven at 60°C.

[0067] (3) Add the above synthesized gold cluster-titanium dioxide sample to the above graphene dispersion, ultrasonicate for 20 minutes and then stir for 20 minutes at room temperature; Wash the precipitate and repeat 3 times, then place the precipitate in a drying oven at 60°C to dry to obtain a powder sample.

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Abstract

The invention relates to a gold cluster-titanium dioxide-graphene composite material capable of being used for visible-light efficient sterilization and a preparing method and application thereof, and belongs to the technical field of composite materials. The preparing method includes the steps that according to the composite material, gold clusters and titanium dioxide nanometer particles are connected in an electrostatic attraction mode, then a compound of the gold clusters and titanium dioxide is connected on the graphene through the functional groups on the graphene, and the mass ratio of the gold clusters to the titanium dioxide to the graphene is (2.5-6.4)%:(78.6-92.5)%:(4.2-15)%. The invention further provides the preparing method and application of the composite material. According to the composite material, the titanium dioxide can be excited by visible light through the visible light absorption performance of the gold clusters, excited electrons are transferred to the graphene through the super-electronic conduction property of the graphene, the recombination rate of electrons and holes are reduced, and therefore the antibacterial effect of the composite material is effectively improved. The killing rate of the composite material for escherichia coli and staphylococcus aureus under the visible light can be 80%.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a gold cluster-titanium dioxide-graphene composite material which can be used for high-efficiency sterilization of visible light, and a preparation method and application thereof. Background technique [0002] Antimicrobial agent is a material whose main function is to kill bacteria and inhibit bacterial growth, and is mainly used in agriculture, medicine, industry and other fields. There are many kinds of antibacterial agents, which can be mainly divided into two categories: organic antibacterial agents and inorganic antibacterial agents. Organic antibacterial materials have disadvantages such as poor heat resistance, easy decomposition, and short service life. With the development of nanotechnology, more and more inorganic materials are being used in the field of antibacterial. Among them, the most interesting antibacterial agent is titanium dioxide, whi...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01P1/00
CPCA01N59/16
Inventor 张海元程岩孙秀娟刘宁常赟冯艳林
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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