Researchers at the North Caucasus Federal University (NCFU) have developed a technology for producing activated carbon from rice husk, buckwheat, sunflower seeds and lavender. Sorbent has magnetic properties and perfectly purifies water. There are no analogues of a similar product on the Russian market. This was reported to socialbites.ca by the Russian Ministry of Education and Science.
Water purification is used in a wide variety of industries, so it is important to develop more efficient and affordable methods. Usually, for these purposes, activated carbon is used, which acts as an adsorbent and absorbs impurities.
For existing enterprises producing activated carbon, wood is the basis of raw materials, an expensive and valuable component. As a more accessible analogue, scientists suggested using agricultural waste – rice husk, buckwheat, sunflower husk and lavender stalks.
Activated carbon synthesis consists of several steps. Vegetable raw material wastes are burned in muffle furnaces at a temperature of 600 to 800 degrees depending on the original raw material. The resulting coal is then ground in a planetary mill. To do this, add zirconium balls with a diameter of two millimeters, alloyed with yttrium oxide, as well as isopropyl alcohol. Surfactants are also used to achieve the minimum particle size.
Next comes the stage that gives the products magnetic properties – coal is placed in bidistilled (doubly purified) water, and solutions of iron salts are added to it under the influence of ultrasound and temperature.
The activated carbon obtained in this way can be easily separated from the solution with a magnet due to its low cost and magnetic properties, with the best physical and chemical properties compared to its analogues.
“Coal-based sorbents are used everywhere in manufacturing. Their purpose is the same as household filters that many people use at home and at work. However, in production, the question often arises of how to effectively remove spent activated carbon from purified water. The idea we propose is unique – similar to what is currently on the market “As a result, the development has no direct competitors,” study author Ksenia Sypko, a young scientist from the North Caucasus Federal University Nevinnomyssk Institute of Technology, told socialbites.ca.
The market price of the proposed biochar will be lower in the range of 8% to 48% compared to the analogues presented. It all depends on which products will compare the development of scientists.
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