Adsorption of Lead(II) Ions on Transcarpathian Clinoptilolite

Abstract

The adsorption of lead(II) ions on the natural forms of Transcarpathian zeolite under static and dynamic conditions was investigated. Partial conversion of inactive calcium ions in the zeolite into relatively more mobile sodium or ammonium ions resulted in an increase in the adsorption of Pb2+ ions. Similarly, partial removal of aluminium oxide from the zeolite changed its physicochemical properties and led to the maximum adsorption of lead(II) ions.

Study of the selection mechanism of heavy metal (Pb2+, Cu2+, Ni2+, and Cd2+) adsorption on clinoptilolite

“…Obviously growth of the metals ions concentrations in solutions leads to their deeper dehydration and hence to more intensive exchange between metals ions and the active surface of the zeolite. It should be noted that adsorption curves of a similar form were obtained during the study of Hg 2+ , Cr 3+ , and Ni 2+ adsorption onto clinoptilolite [25].…”

“…Under dynamic conditions the maximum sorption capacities of the Transcarpathian clinoptilolite proper toward lead from 100 mg/L solutions were evaluated as 0.5. 5.0, and 4 mg/g for raw, ammonium, and sodium forms, respectively [25]. However, the sorption capacity toward cadmium of the different treated forms of the same clinoptilolite ranged from 1.0 up to 7.4 mg/g [21].…”

“…Many researchers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] have investigated various aspects of heavy metal removal from wastewater [13][14][15] and synthetic aqueous solutions by clinoptilolite and other zeolites. The nature of the process as well as its deciding factors is usually the most interesting.…”

“…The limited data are also available for metal ion exchange with the clinoptilolite in terms of equilibrium isotherms and kinetics especially with consideration of the mechanism of the process on different stages. Adsorption of heavy metals on the Transcarpathian clinoptilolite under dynamic conditions was studied and reported [21,25]. The aim of the present work is to study heavy metal (Ni 2+ , Cu 2+ , Pb 2+ , and Cd 2+ ) uptake from single-and multicomponent synthetic aqueous solutions by raw and pretreated forms of the natural zeolite and Transcarpathian clinoptilolite under static conditions and to estimate the optimal operation parameters of the process.…”