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Nano silver loaded graphene antibacterial composite material and preparation method thereof

A composite material and graphene technology, applied in botany equipment and methods, chemicals for biological control, animal repellants, etc., can solve the problem of high antibacterial concentration, low silver particle loading, silver/graphene Poor biological security and other issues, to achieve the effect of preventing discontinuity of the sheet

Inactive Publication Date: 2018-01-12
郴州博太超细石墨股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a green, simple, good biosafety and antibacterial performance for the silver / graphene composite material with poor biological safety, low silver particle loading and high antibacterial concentration. Graphene Antimicrobial Composite with Silver Nanoparticles

Method used

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  • Nano silver loaded graphene antibacterial composite material and preparation method thereof
  • Nano silver loaded graphene antibacterial composite material and preparation method thereof

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Effect test

Embodiment 1

[0034] This embodiment provides a method for preparing nano-silver-loaded graphene antibacterial composite material, which includes the following steps:

[0035] S1. Preparation of graphene oxide aqueous solution: the modified Hummers method is used to prepare graphene oxide, and then the second ultrasonic dispersion is performed to obtain 0.04g / L single-layer graphene oxide aqueous solution, and then silver nitrate is added to obtain a silver nitrate / graphene oxide mixed solution , The concentration of silver nitrate is 0.08g / L;

[0036] S2. Add glucose and soluble starch to the step silver nitrate / graphene oxide mixed solution, the glucose concentration is 0.072g / L, the soluble starch concentration is 0.08g / L, and then placed in a hydrothermal reaction kettle, using hydrothermal reaction, The reaction temperature is 100°C, the reaction time is 6h, and the steam pressure is 0.3-4Mpa. After the reaction, it is naturally cooled to room temperature, and then the product is separated,...

Embodiment 2

[0050] This embodiment provides a method for preparing nano-silver-loaded graphene antibacterial composite material, which includes the following steps:

[0051] S1. Preparation of graphene oxide aqueous solution: the modified Hummers method is used to prepare graphene oxide, and then the second ultrasonic dispersion is performed to obtain 0.09g / L monolayer graphene oxide aqueous solution, and then silver nitrate is added to obtain a silver nitrate / graphene oxide mixed solution , The concentration of silver nitrate is 0.18g / L;

[0052] S2. Add glucose and soluble starch to the step silver nitrate / graphene oxide mixed solution, the glucose concentration is 0.432g / L, the soluble starch concentration is 0.16g / L, and then placed in a hydrothermal reaction kettle, using hydrothermal reaction, The reaction temperature is 140°C, the reaction time is 4h, and the water vapor pressure is 0.3-4Mpa. After the reaction, it is naturally cooled to room temperature, and the product is separated, w...

Embodiment 3

[0058] This embodiment is basically the same as embodiment 1, except that the hydrothermal reaction temperature in step S2 is 200° C. and the reaction time is 4 h; the hydrothermal reaction temperature in step S3 is 140° C. and the reaction time is 6 h.

[0059] The loading amount of nano silver particles in the graphene / nano silver composite material prepared in this embodiment is 42.00%. When the concentration is 0.09 μg / ml, the antibacterial rate against E. coli reaches 99.7%. The loading of nano silver particles in this embodiment The main reason for the large reduction in the amount is that the graphene oxide will exhibit thermal weight loss behavior in step S2, and the oxygen-containing functional groups are decomposed in a large amount, resulting in a reduction in the amount of reduced silver ions.

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Abstract

The invention relates to the field of graphene composite materials and discloses a nano silver loaded graphene antibacterial composite material and a preparation method thereof. A single-layer graphene oxide solution is obtained through a secondary ultrasonic dispersion technology and a discontinuous sheet layer is prevented; a carbon cake formed by mutually mixing a plurality of layers of graphene oxide sheets is innovatively subjected to secondary hydrothermal method reaction; green reduction agents including glucose and ascorbic acid and a green stabilizer soluble starch are adopted respectively and the hydrothermal method reaction is matched, so that the reduction rate is extremely improved and a sealing system with relatively high temperature and inner pressure is adopted; the recycling of dehydrated p conjugation is also promoted and the minimization of defects is facilitated; after heat treatment is carried out, the structure of graphene is easy to recover; the antibacterial activity of free Ag nanoparticles is remained in the composite material. The loading amount of silver particles in the nano silver loaded graphene antibacterial composite material reaches 58.0 percent and the antibacterial rate on escherichia coli reaches 99.9 percent.

Description

Technical field [0001] The invention relates to the field of graphene composite materials, and more specifically, to a graphene antibacterial composite material loaded with nano silver and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional planar single-layer structure of carbon formed by sp2 hybridized carbon atoms in the form of a hexagonal lattice, which is an allotrope of carbon. Graphene is the basic unit for constructing other dimensional carbon materials. When it is changed by wrapping, winding and stacking, it can form zero-dimensional fullerene, one-dimensional carbon nanotubes and three-dimensional graphite, respectively. Graphene has good electrical and optical properties, mechanical properties, thermal conductivity and extremely high charge carrier mobility, as well as excellent mechanical strength and flexibility. These properties of graphene have attracted a lot of attention and quickly become a research focus. Graphene and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N25/08A01P1/00
Inventor 林荣铨
Owner 郴州博太超细石墨股份有限公司
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