Development Of The Modified Sorbents
Development of the modified sorbents
for extraction of ions of heavy metals
from liquid solutions
I. Dedenko1, I. Samodumova1, S. Dedenko1, G. Telbiz2,
O. Shvets2, V. Il’in2, F. Bobonich2
1Scientific-Research Center "Sorption",
Tereshchenkivska st. 17 V, 01004 Kyiv, Ukraine
2Institute of Physical Chemistry, Ukrainian National Academy Sciences,
Nauky avenue 31, 03028 Kyiv, Ukraine
Among environmental problems of last millenium one of the most significant is growing of loading on the ground in connection with development of atomic engineering and the nuclear industry, and also the necessity which has arisen in the world problem due to removing from operation of nuclear power units.
Development of effective technologies of clearing of waters from radioactive contamination of and products of their disintegration (ions of heavy metals) gets in this connection, a special urgency as expansion radioactive loadings in the big territories may threaten water supply of many settlements of Ukraine. Development is necessary for their clearing new both updating of existing sorbents and optimization of processes sorption in various environments.
For decision of the tasks in view we investigated and modified sorbents of a different nature and testing their opportunity for selective absorption ions of some metals is carried out.
The granulated modified synthetic, natural zeolites and carbons s was used. The factors of distribution calculate in the manner of relations of contents fixed cation in unit of mass of sample to their contents in 1 ml solution after sorption cations. Results of analysis ion-exchange balances of samples confirm the suggestion about the change of the selective sorption of the cations at various of the exchange capacity and pH solution. The amounts of cation in solutions were determined by atomic absorption and Xray-fluorescent spectroscopy.
Figure 1.Graphic simulation of absorption of the Cu2+ and Ni2+ cations by various sorbents
As can be seen from Fig.1 (on the example of cuprum and cadmium ions) selectivity and absorption ability of sorbents undergoes significant changes depending on pH solutions and nature of metals. We establish numbers of selectivity of various sorbents for many metals and ways of their modification for their subsequent application.
Acknowlegment
The work was financially supported by the Ukrainian Scientific – Technical Center under grant № 1437.
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