Acid-Modified Clinoptilolite - Effective Sorbent of Sc(lll) from Aqueos Solutions

摘要

The sorption properties of acid-modified Transcarpathian clinoptilolite towards Sc(III) under dynamic conditions have been studied. It was found that the most effective acid-modifier is 0.5M HC1 solution. Maximal sorption capacity is observed in the previously heat-treated at 50 °C samples of H-clinoptilolite in low alkaline solutions (pH=8.5). At this conditions almost all of the Sc(III) ions are in the form of neutral hydroxo complex [Sc(OH)_3(H_2O)_3]. The sorption capacity of H-clinoptilolite towards Sc(III) ions under optimum conditions is 9.98 mg/g. The best desorbent of Sc(III) from acid-modified clinoptilolite is 6 M HC1 solution. This desorbent removes 98% of sorbed Sc(III).