The kinetic sorption of heavy metals from surface water on natural and modified polyethilenimine clinoptilolite of Holinsky deposit

Abstract

The kinetic sorption of heavy metals (HM) from surface water on natural clinoptilolite (CLT) and modified clinoptilolite (PEI-CLT) was investigated with a dynamic methodic. The dynamic experiments were carried out of all heavy metals simultaneously at their low concentrations. ISP-MS method was used for analysis the concentrations of HM in solutions. The breakthrough curves were carried out for 1,0g of sorbents under different line flow rate (0.01, 0.045 and 0.2 cm/sec). The sorption characteristics (the distribution coefficients of HM and film-diffusion coefficients) were calculated for CLT and PEI-CLT under different line flow rate of solution, using the film-diffusion kinetic model and line isotherm sorption. It was shown the satisfactory correspondence between theoretical and experimental breakthrough curves for sorption HM with investigated sorbents. The natural clinoptilolite CLT can be recommended for purification of surface water (pH 6.7) from Cd and Sr; PEI-CLT – from Cr, Cd, Ni, Zn.