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Martes, 30 de Abril de 2019

Química

Noticia en inglés

Scientists from the National University of Science and Technology “MISIS” together with their colleagues from Derzhavin Tambov State University and Saratov Chernyshevsky State University have figured out that graphene can purifying water, making it drinkable, without further chlorination. “Catching” bacterial cells, it forms flakes that can be quickly drawn out from the water. Graphene separated by ultrasound can be recycled. The post on the research study is released in Materials Science & Engineering C.

Graphene and graphene oxide (a more steady version of the material in colloidal options) are carbon nanostructures that are incredibly appealing for Biomedicine. For example, it can be utilized for targeted drug delivery on graphene “scales” and for tumor imaging. Another intriguing property of graphene and graphene oxide is the capability to ruin bacterial cells, even without the extra use of antibiotic drugs.

Scientists from the National University of Science and Innovation “MISIS” together with their associates from Derzhavin Tambov State University and Saratov Chernyshevsky State University have conducted an experiment, injecting graphene oxide into services (nutrient medium and the saline) consisting of E.coli. Under the regards to the experiment, saline “simulated” water, and the nutrition medium simulated human body medium. The results showed that the graphene oxide in addition to the living and the destroyed bacteria form flakes inside the options. The resulting mass can be easily extracted, making water practically completely totally free of germs. If the extracted mass is then treated with ultrasound, graphene can be separated and recycled.

” As working services, we selected a nutrient medium for the cultivation of germs (it is to the natural habitat of germs), as well as regular saline, which is used for injections. As a tested bacterial culture, E. coli modified with a luminous agent was utilized to assist in visualization of the experiments, was used”, Aleksandr Gusev, among the authors, Associate Professor of NUST MISIS Department of Practical Nanosystems and High-Temperature Materials, comments.

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1) Graphene oxide, included in water 2) Water after purification with graphene oxide 3 )Graphene oxide ‘flakes’ with bacteria prior to extraction.( Credit: © NUST MISIS )

Graphene oxide was included to the nutrient option in different concentrations – 0.0025 g/l, 0, 025 g/l, 0.25 g/l and 2.5 g/l. As it turned out, even at a minimum concentration of graphene oxide in saline (water), the observed antibacterial effect was substantially higher than in the nutrient medium (human body). Researchers believe that this suggests not a mechanical, however a biochemical nature of the mechanism of action, that is, considering that there are far less nutrients in the saline service, the germs moved more actively and was “recorded” by the scales of graphene oxide more frequently.

According to the fluorescent test data, validated by laser confocal microscopy and scanning electron microscopy, at 2.5 g/l concentration of graphene oxide, the number of bacteria reduced a number of times compared to the control group and became close to zero.

While it is not yet understood exactly how the further destruction of germs occurs, researchers believe that graphene oxide provokes the development of free radicals that are hazardous to germs.

According to scientists, if such a filtration system is utilized for water, it will be possible to prevent extra chlorination. There are other benefits: decontamination with graphene oxide has a low cost, in addition, this innovation is simple to scale to the format of big city wastewater treatment plants. (Fuente: National University of Science and Innovation MISIS)

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