A comparative study of ion exchange kinetics in zinc/lead-modified zeolite-clinoptilolite systems

Journal of Hazardous Materials
M TrgoN Vukojević Medvidović

Abstract

The kinetics of zinc and lead ions removal by modified zeolite-clinoptilolite has been investigated. The rate of the ion exchange process for lead ions is faster than for zinc ions, as well as the time needed to reach the equilibrium. The ion exchange capacity of zeolite of lead ions is doubly higher than that of zinc ions. Diffusion models according to the Vermeulen's approximation, the parabolic diffusion model and the homogeneous diffusion model have been tested with the experimental data of ion exchange for zinc and lead. For both systems examined, the best fit of the models proposed with the experimental data was shown by the Vermeulen's approximation and the homogeneous diffusion model with t-->t(infinity). The diffusion coefficients are calculated from kinetic models of lead ions they are of the order of 10(-6)cm(2)/min, constant for all examined initial concentrations and not dependent on time. The diffusion coefficients in the system of zinc ions is of the order of 10(-8)cm(2)/min, also independent of initial concentrations, but decreasing with time from the beginning of ion exchange to the equilibrium.

References

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Citations

Jul 12, 2013·TheScientificWorldJournal·Nurdan Gamze Turan, Okan Ozgonenel
Mar 8, 2014·Journal of Environmental Management·L Mihaly-CozmutaEmil Indrea
Jul 24, 2012·Journal of Hazardous Materials·Mina JovanovicBojana Obradovic
Apr 8, 2011·Journal of Hazardous Materials·Evina KatsouMaria Loizidou
Feb 23, 2010·Journal of Hazardous Materials·Mario SiljegMiroslav Kukucka
May 26, 2009·Journal of Hazardous Materials·Wei-yu ShiSheng Du
May 12, 2009·Journal of Hazardous Materials·Hua LiMing-an Shao
Jun 21, 2008·Journal of Hazardous Materials·Indianara C OstroskiOswaldo C M Lima
Aug 9, 2016·Environmental Monitoring and Assessment·Nimisha TripathiBalaji Seshadri
May 15, 2018·International Journal of Environmental Research and Public Health·Antonio MolinariCarmine Fallico
Jun 16, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Anca PeterLeonard Mihaly-Cozmuta
May 11, 2011·Water Environment Research : a Research Publication of the Water Environment Federation·Evina KatsouKatherine Haralambous
Mar 12, 2021·ACS Applied Materials & Interfaces·Jilong LiMercouri G Kanatzidis
Jun 24, 2008·Journal of Colloid and Interface Science·T K NaiyaS K Das
Sep 12, 2008·Journal of Hazardous Materials·Tarun Kumar NaiyaSudip Kumar Das

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