Use of Na-modified clinoptilolite for the removal of terbium ions from aqueous
solution
Chem.
Met. Alloys 5
(2012) 136-141
https://doi.org/10.30970/cma5.0217
O. VYVIURSKA, V. VASYLECHKO,
G. GRYSHCHOUK, Ya. KALYCHAK, V. ZAKORDONSKIY
In this study, Na-modified Transcarpathian
clinoptilolite was used for preconcentration
of trace amounts of terbium(III) ions from aqueous
solutions. The sorbent was characterized by thermogravimetric analysis. The influence of the
preliminary thermal treatment on the sorption activity of Na-modified clinoptilolite was thoroughly investigated. In addition, it
was found that such characteristics of the solution as the terbium
concentration, acidity, and ion strength have an effect on the sorption
capacity of the zeolite in dynamic conditions. The
optimum pH range of the solution was
found to be 8.8-9.0. A preliminary thermal treatment of Na-clinoptilolite
in the temperature range 475-700°C increased the sorption capacity of the sorbent. 7M nitric acid, 6M hydrochloric acid, and 1M NaCl solutions were identified as effective desorbents of terbium(III) ions
from Na-clinoptilolite. Furthermore, the influence of
the most common ions on the uptake capacity of the sorbent
was evaluated.
Dependence of the sorption capacity of
Na-modified clinoptilolite towards terbium(III)
on thermal treatment
Keywords
Terbium /
Na-clinoptilolite / Sorption / Solid-phase extraction