In this study, the adsorption behavior of natural (clinoptilolite) zeolites with respect to Co2+, Cu2+, Zn2+, and Mn2+ has been studied
in order to consider its application to purity metal finishing wastewaters. The batch method has been employed, using metal concentrations
in solution ranging from 100 to 400 mg/l. The percentage adsorption and distribution coefficients (Kd) were determined for the adsorption
system as a function of sorbate concentration. In the ion exchange evaluation part of the study, it is determined that in every concentration
range, adsorption ratios of clinoptilolite metal cations match to Langmuir, Freundlich, and Dubinin–Kaganer–Radushkevich (DKR)
adsorption isotherm data, adding to that every cation exchange capacity metals has been calculated. It was found that the adsorption phenomena
depend on charge density and hydrated ion diameter. According to the equilibrium studies, the selectivity sequence can be given as
Co2+ > Cu2+ > Zn2+ > Mn2+. These results show that natural zeolites hold great potential to remove cationic heavy metal species from
industrial wastewater