Sorption of heavy metals Ni, Cd, Cr, Zn, Cu from the surface water by natural and modified clinoptilolites
Keywords:
clinoptilolite, modification by polyethyleneimine, surface waters, heavy metals, distribution coefficients.Abstract
It has been experimentally studied the sorption of heavy metals Ni, Cd, Zn, Cu, and Cr (as CrO42-
) from the surface water on the natural clinoptilolite of Holinsky deposit (CLT) and on the same
clinoptilolite modified by polyethyeneimine (PEI CLT-PEI). The influences of metal concentration, pH
and ionic strength in solution, as well as the sorbent size on metal sorption were considered. The
breakthrough curves of sorption and desorption of heavy metals with 0,2N HCl were obtained. It was
shown that the metals distribution coefficients on CLT-PEI were higher, then ones on CLT when pH of
solution was between 5-7. It was shown that the both sorbents, especially CLT-PEI, can be used for
purification of different surface waters and solutions with higher ion force from heavy metals.
