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Magnetic graphene oxide nanometer compound, preparation method and application thereof

A nanocomposite and magnetic nanoparticle technology, applied in the new field of nanocomposite materials and water treatment, can solve the problems of recycling and reuse of unfavorable graphene oxide antibacterial materials, promoting growth and reproduction, secondary pollution of water bodies, etc. product, enhanced antibacterial effect, low cost effect

Inactive Publication Date: 2014-07-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophilicity of graphene oxide, it is difficult to separate when suspended and dispersed in water, which is not conducive to the recycling and reuse of graphene oxide antibacterial materials, and even low-concentration graphene oxide suspended in water may become some A carbon source for harmful microorganisms, which promotes their growth and reproduction and causes secondary pollution of water bodies

Method used

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  • Magnetic graphene oxide nanometer compound, preparation method and application thereof
  • Magnetic graphene oxide nanometer compound, preparation method and application thereof
  • Magnetic graphene oxide nanometer compound, preparation method and application thereof

Examples

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Embodiment 1

[0030] A magnetic graphene oxide nanocomposite of the present invention, the magnetic graphene oxide nanocomposite comprises graphene oxide, and the graphene oxide surface is loaded with Fe 3 o 4 Magnetic nanoparticles and γ-Fe 2 o 3 Magnetic nanoparticles, also loaded with non-magnetic α-Fe 2 o 3 , FeOOH nanoparticles.

[0031] A kind of preparation method of the magnetic graphene oxide nanocomposite of above-mentioned present embodiment, comprises the following steps:

[0032](1) Disperse 1g graphite powder into 23mL concentrated H 2 SO 4 (98wt%), the dispersion was magnetically stirred in an ice-water bath at 0-5°C for 0.5h to ensure that the graphite powder had been evenly dispersed in concentrated H 2 SO 4 , then add 0.5g NaNO 3 , continue magnetic stirring for 0.5h to ensure NaNO 3 fully dissolved in concentrated H 2 SO 4 Medium (graphite powder and NaNO 3 Concentrated H can also be added at the same time 2 SO 4 middle), stir the cooled mixture, and add 3g...

Embodiment 2

[0037] Inoculate Escherichia coli into deionized water after activation, so that the concentration of the bacteria solution reaches 10 6 ~10 7 CFU / mL.

[0038] The above-mentioned Escherichia coli is Escherichia coli Escherichia coli , can be purchased from the market, and its preservation number in the China Medical Bacteria Collection Management Center is CMCC 44102, preferably using this bacterium, but not limited thereto.

[0039] Graphene oxide (GO), iron oxide magnetic nanoparticles (M) and magnetic graphene oxide nanocomposites (M-GO) prepared in Example 1 were applied to water sterilization, taking Escherichia coli as an example, and comparing their Sterilization effect, including the following steps: take 5 mL of GO dispersion liquid, M dispersion liquid, and M-GO dispersion liquid of the same concentration (100 μg / mL), ultrasonically disperse for 1 min, add 5 mL of the above-mentioned prepared concentration to 3.79×10 6 CFU / mL of Escherichia coli bacteria liquid,...

Embodiment 3

[0042] After the Escherichia coli in Example 2 was incubated with the magnetic graphene oxide nanocomposite (M-GO) at 37°C for 2h with shaking, the Escherichia coli was isolated and collected, and then pre-fixed with 3wt% glutaraldehyde for 2h at 4°C. After repeated washing with phosphate buffer three times, fix with starvation acid for 2 hours, and continue to wash twice with phosphate buffer, with an interval of 10 minutes each time. The fixed Escherichia coli was stained with 1 wt% uranyl acetate for 1 h, and then dehydrated with 50%, 70%, 90% and 100% volume concentration of ethanol for 10 min each. Soak the fixed and dehydrated Escherichia coli with a mixture of acetone and Spurr resin with a volume ratio of 1:1 for more than 1 h, then soak overnight with pure Spurr resin at 37 °C, and then cure at 60 °C for 48 h, cool down, and slice , and then placed under a transmission electron microscope to observe the cell morphology of Escherichia coli.

[0043] Such as Figure 6...

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Abstract

The invention discloses a magnetic graphene oxide nanometer compound, a preparation method and application thereof. The magnetic graphene oxide nanometer compound comprises graphene oxide, and the surface of graphene oxide is loaded with iron oxides magnetic nanometer particles. The preparation method comprises preparation of a graphene oxide dispersion liquid, preparation of an iron oxides magnetic nanometer particle dispersion liquid and preparation of the magnetic graphene oxide nanometer compound. The magnetic graphene oxide nanometer compound is applicable to water sterilization. The magnetic graphene oxide nanometer compound disclosed by the invention is excellent in antibacterial performance, efficient and easy to separate, the preparation method is simple and low in cost, the water sterilization processing effect is good, disinfection by-products is not easy to generate and secondary pollution is not easy to cause.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials and new water treatment technologies, and in particular relates to a magnetic graphene oxide nanocomposite, a preparation method thereof and an application in water body sterilization. Background technique [0002] Today, when there is a serious shortage of water resources and drinking water safety is facing major challenges, the traditional drinking water chlorination disinfection technology may generate trihalomethanes, haloacetic acids and other disinfection by-products, which are potentially dangerous to human health and cannot meet the requirements. Therefore, , the research of new disinfection materials must be indispensable. Research on drinking water treatment shows that nanotechnology has infinite potential for drinking water cleaning. In the past 20 years, carbon nanomaterials, such as fullerenes discovered in 1985 and carbon nanotubes (CNTs) discovered in 1991, have , large speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01P1/00C02F1/50
Inventor 邓灿辉龚继来曾光明牛承岗牛秋雅张薇刘红玉
Owner HUNAN UNIV
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