Sorbents for water purification from radionuclides.
Sorbents for water purification from radionuclides represent material from the oxygen-modified carbon (CMU), which removes radioactive substances from water. These sorbents fairly easy and inexpensive to produce and used in the standard filtration systems.
Sorbents for water purification from radionuclides represent material from the oxygen-modified carbon (CMU), which removes radioactive substances from water. Oxygen-modified carbon can easily absorb cations of metals such as cesium, strontium, uranium, thorium, and radium.
To receive sorbent was used especially of the porous structure of two different sources of carbon. One of them is black, coke powder, widely used oil-producing companies in the U.S. as an additive to drilling mud, the second is mineral shungite with mine and mined tons in Russia in Karelia. Simple shungit ancient times used to filter water. Scientists were able to greatly increase its effectiveness and to discover the real mechanisms of its action.
To obtain the CMU particles of the original carbon, the size from 10 to 80 microns, are treated with oxidizing substances, which increases their porosity and surface supplies porcelanite functional groups necessary for the absorption of toxic metals. It is important to note that the non-oxidized forms of carbon, such as activated carbon, in spite of their effectiveness in the sorption of gases and organic substances, are not suitable for sorption of metal cations.
Two new types of KMU – from coke and thin better than many other well-known sorbents are suitable for absorbing radioactive cesium isotope 137Cs , which is the biggest problem.
Externally, the two types of particles CMU look like balls of crumpled paper or as rosebuds with asymmetrical petals.
Sorbents for water purification from radionuclides on the basis of the Cabinet of Ministers is also quite easy and inexpensive to produce and used in the standard filtration systems.
The effect of the sorbents was checked by mixing with the contaminated water in the column filter feeders, where the liquid is pumped through the filters by gravity.
The researchers diluted in spring water particles of non-radioactive isotopes of cesium and strontium, then missed enriched with ions of the water through the filters, and at the end of the experiment made measurements of residues of the targeted elements in the water.
Sorbents for water purification from radionuclides on the basis of the CMU type 1 (from coke) is better removed cesium and strontium, and with increasing amount of sorbent results also grew. 800 mg of the CMU-1 removed about 83% of cs and 68% of strontium from 100 ml of water.
Sorbents for water purification from radionuclides on the basis of the CMU type 2 (shungite) in those concentrations has absorbed 70% of the cesium and 47% of strontium. It was discovered that a simple shungite showed almost the same result in the case of cesium and oxidized.
– ease of production of sorbents,
– while other substances used to clean radioactive wastes must then be stored together with the wastes, carbon also afterwards you can burn in the nuclear furnace. After this it remains only a small amount of radioactive fly ash, which is much easier to store
– easy to use in standard treatment systems,
– a rather cheap production.