RUDN University Chemist Creates Nanofilter to Clean Water from Toxic Dyes
Synthetic dyes are used in industrial chemistry and pharmaceuticals. They reach the wastewater together with other industrial waste and pollute the environment. Existing methods of water purification are not quite practical, as the proposed adsorbents are usually disposable and work slowly. Therefore, chemists continue to look for effective and eco-friendly solutions to this problem. A RUDN University chemist, together with colleagues from India and Korea, has proposed a reusable graphene-based nanocomposite that can quickly absorb dyes from water.
“Throughout the world, the discharging of excess organic dyes from different industries such as leather, cosmetics, textiles, paper etc. have the serious water polluted resources and caused a great damage to human health and aquatic system. These different organic dyes are non-degradable, and create carcinogenic, breathing, vomiting, eye burns, diarrhea and nausea in human beings. Graphene oxide have attracted great attention because of their broad spectrum of applications in the various fields including removal of different types of pollutants from water,” said Vinod Kumar, RUDN University professor.
Chemists have created an adsorbent made of graphene oxide (GO) and manganese oxide (MnO2). Nanocomposite synthesis is fast and environmentally friendly. It goes in one step, in an aqueous solution, at 120 ° C. The structure and chemical properties of the adsorbent were studied by scanning electron microscopy and spectroscopy. To test its effectiveness, scientists dissolved methyl orange and methylene blue in water. The first one is the cationic dye, the second one is anionic. 50 mg of adsorbent was placed in 50 ml of a solution with an initial contaminant concentration of 150 mg per liter. For five hours, chemists measured the level of water contamination.
The adsorbent successfully removed 50.48% of methyl orange and 85.35% of methylene blue after just five minutes of action. After an hour, there were practically no pollutants left in the water — the complex absorbed 94-100% of the dyes. One gram of adsorbent was able to hold 149 mg of methyl orange and 178 mg of methylene blue. The complex also turned out to be reusable. The efficiency of removing pollutants did not fall below 90% even after 7 cycles of use.
“From these results, it can be assumed that the synthesized adsorbent can be used to purify the water by filtration. By considering the low cost and higher adsorption potential, GO-MnO2 nanocomposite will be becoming a promising candidate for simultaneous removal of cationic and anionic dyes from polluted water for water purification.,” said Vinod Kumar, RUDN University professor.
The results are published in the Journal of Environmental Chemical Engineering.
Matilda Pavlovna Mityaeva was born in 1925. In November 1942, she volunteered for frontline duty. She participated in the Great Patriotic War from November 1942 to June 1945 as part of the 53rd Infantry Division of the 475th Infantry Regiment. She was wounded twice.
The team led by Sergey Zyryanov, Head of the Department of General and Clinical Pharmacology, became the winner of the All-Russian competition of scientific projects "Technologies for Human Health".
RUDN University constantly adapts to the changes of the modern world and responds to challenges flexibly. This allows us to keep the standard of a world-class research university. The sphere of science is no exception. Peter Dokukin, Head of the Research Division, presented the updated R&D Programme at the meeting of the RUDN University Academic Council.
Matilda Pavlovna Mityaeva was born in 1925. In November 1942, she volunteered for frontline duty. She participated in the Great Patriotic War from November 1942 to June 1945 as part of the 53rd Infantry Division of the 475th Infantry Regiment. She was wounded twice.
The team led by Sergey Zyryanov, Head of the Department of General and Clinical Pharmacology, became the winner of the All-Russian competition of scientific projects "Technologies for Human Health".
RUDN University constantly adapts to the changes of the modern world and responds to challenges flexibly. This allows us to keep the standard of a world-class research university. The sphere of science is no exception. Peter Dokukin, Head of the Research Division, presented the updated R&D Programme at the meeting of the RUDN University Academic Council.