SORPTION ACTIVITY OF UKRAINIAN SALTY COALS TOWARD POLYVALENT METALS

摘要

The problem of environmental protection in Ukraine is extremely important. Therefore search of cheap adsorbents for different pollutants is very actual. Some kinds of natural fuel can be efficient sorbents. Basic factors, which influence on sorption capacity of brown coals were established. They are petrographic composition, content of acid functional groups, microporosity, seam moisture of coal and ionization potential of adsorbates. Electron transfer between contacting phases plays an important role in adsorption processes. The low grade coals of Ukraine with high content of sodium chloride (5-15% in ash) - salty coals (SC) were considerated as sorbents for some heavy metals. Salty coals have some peculiarities of structure and properties, such as high content of oxygen groups in H~+- and cation-substituted forms, different kind of microelements (30-32), large size of polyarene packets (15-35A) in coal organic mass (COM). Combination of these factors can provide different types of sorption by SC. The objective of this work were: to estimate the sirption capacity of SC toward Cu and Cr -ions, to detail the mechanism of the ions sorption by salty coals.