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Method for preparing silver/graphene antimicrobial composite material

A composite material and graphene technology, applied in botany equipment and methods, fungicides, chemicals for biological control, etc., can solve problems affecting safety, uneven dispersion of silver particles, affecting antibacterial performance, etc., to achieve Great bioirritancy, excellent antimicrobial properties, uniform size and shape effects

Active Publication Date: 2011-07-20
UNIV OF SCI & TECH OF CHINA
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  • Description
  • Claims
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Problems solved by technology

However, the silver particles in the silver / graphene mixture prepared by this method are unevenly dispersed, and its complete antibacterial concentration is as high as 50 μg / ml; and, because the reducing agent sodium borohydride added in this method affects the safety of later application
[0005] The main problem of the silver / graphene composite material prepared by the method disclosed in the above-mentioned prior art is that the concentration is high when it reaches complete antibacterial, thus affecting its antibacterial performance, and some raw materials that affect biological safety are also quoted in the above-mentioned method , such as potassium hydroxide or sodium borohydride

Method used

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  • Method for preparing silver/graphene antimicrobial composite material
  • Method for preparing silver/graphene antimicrobial composite material
  • Method for preparing silver/graphene antimicrobial composite material

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preparation example Construction

[0038] A kind of preparation method of silver graphene antibacterial composite material provided by the invention comprises:

[0039] a) provide the aqueous solution of reduced graphene oxide-polystyrene sodium sulfate complex;

[0040] b) heating the aqueous solution of the complex in step a) to 50°C to 70°C;

[0041] c) adding a silver nitrate solution to the heated composite aqueous solution in step b) and reacting to obtain a silver / graphene antibacterial composite material.

[0042] Such as figure 1 Shown is a schematic diagram of the synthesis process of the silver / graphene antibacterial composite material and the process of killing Escherichia coli in the present invention. The silver ions provided by silver nitrate are first attached to the surface of the reduced graphene oxide sheet-polystyrene sodium sulfate composite due to the electrostatic adsorption of polystyrene sodium sulfate, and the silver ions are reduced in situ by the reduced graphene oxide sheet , for...

Embodiment 1

[0058] Preparation of Graphene Oxide

[0059] 30ml of 98% H 2 SO 4 , 10gK 2 S 2 o 8 , 10gP 2 o 5 The mixed solution was heated to 80°C, added 20g of graphite powder and stirred evenly to obtain a dark blue mixture, and then the mixture was cooled to room temperature;

[0060] The obtained product is washed with distilled water suction filtration until the pH value is neutral, and then the washed product is dried in air to obtain pre-oxidized graphite powder;

[0061] Get 20g of pre-oxidized graphite powder and add it to 460ml of 98% concentrated H at 0°C 2 SO 4 To obtain the fourth mixed solution, slowly add 60gKMnO under stirring and ice bath conditions 4 , adding KMnO 4 Keep the system temperature at 15°C during the process;

[0062] After adding KMnO 4 Afterwards, the fourth mixed solution was warmed up to 35°C and stirred for 2h, 920ml of distilled water was added, and then 2.8L of distilled water and 50ml of 30% H 2 o 2 , the product turns yellow;

[0063] ...

Embodiment 2

[0065] Take 100 mg of the graphene oxide sheet prepared in Example 1 and add it to 100 ml of distilled water. After ultrasonic dispersion, add 1 g of polystyrene sodium sulfate, stir to dissolve, add 100 μl of hydrazine hydrate, heat to reflux at 100°C for 24 hours, and filter the product with suction. The reduced graphene oxide-polystyrene sodium sulfate composite was obtained by lyophilization.

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Abstract

The invention provides a method for preparing a silver / graphene antimicrobial composite material, and the method provided by the invention comprises the following steps: a) providing a reductive graphene oxide-sodium polystyrene sulfate composite solution; b) heating the composite solution obtained in the step a) to 50-70 DEG C; and c) adding a silver nitrate solution into the heated composited solution obtained in the step b) for reaction, thus obtaining the silver / graphene antimicrobial composite material. The invention provides the method for preparing the silver / graphene antimicrobial composite material; and in the method, a reductive graphene oxide tablet is taken as a reducing agent for carrying out reduction on silver ions under a neutral pH condition so as to generate silver nano particles. In the method provided by the invention, no sodium borohydride is taken as a reducing agent, and in the whole preparation process, no potassium hydroxide is adopted, therefore, when the composite material prepared by the method is subjected to later application, no large biological irritant is caused. In addition, antibacterial experiments show that the silver / graphene antimicrobial composite material provided by the invention has a better antibacterial effect.

Description

technical field [0001] The invention relates to a graphene composite material, in particular to a preparation method of a silver / graphene antibacterial composite material. Background technique [0002] Graphene is a two-dimensional carbon atom crystal with a thickness of one atom. It is the thinnest substance artificially produced at present. It is considered to be the basic structural unit of fullerene, carbon nanotube and graphite. Free-state 2D crystal structures have long been considered thermodynamically unstable and cannot exist independently in ordinary environments. Until 2004, Geim et al. of the University of Manchester in the United Kingdom obtained graphene in stable existence for the first time by using micromechanical splitting method. Since the discovery of graphene, due to its excellent physical and chemical properties and broad application prospects, research work related to graphene has become a current research hotspot in related disciplines. [0003] In ...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01N59/00A01P3/00
Inventor 俞书宏陆杨张乐诚徐维平李建平马旖旎李会会董良
Owner UNIV OF SCI & TECH OF CHINA
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