caa a22 4500 606170774 CHVBK 20210128100719.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10098-014-0794-8 doi (NATIONALLICENCE)springer-10.1007/s10098-014-0794-8 Kinetics, thermodynamics, and structural investigations on the removal of Pb2+, Cd2+, and Zn2+ from multicomponent solutions onto natural and Fe(III)-modified zeolites [Elektronische Daten] [Marija Mihajlović, Slavica Lazarević, Ivona Janković-Častvan, Janez Kovač, Bojan Jokić, Djordje Janaćković, Rada Petrović] The adsorption of Pb2+, Cd2+, and Zn2+ from equimolar multicomponent solutions onto natural and Fe(III)-modified zeolites was studied by batch experiments in order to determine the influence of the competitive effect on the efficiency ions removal at different initial concentrations and different temperatures. Kinetic and equilibrium studies showed that affinity of both zeolites was the highest for Pb2+ and much lower for Zn2+ and Cd2+. The competitive effect was negligible at lower concentrations, while Zn2+ and especially Cd2+ ions adsorption was suppressed as the concentrations were increased. Affinity of natural zeolite toward the ions was lower than that of the modified zeolite, as was shown for adsorption from single-component solutions. External film diffusion was the rate-controlling step at lower concentrations and for ions of higher affinity for the adsorbent, while intraparticle diffusion was dominant at higher concentrations and for ions of lower affinity for the adsorbent. The increasing spontaneity of the adsorption process with increasing temperature and the positive values of enthalpy of adsorption indicated the endothermic nature of the adsorption process. Structural investigations of the adsorbents loaded with Pb2+, Cd2+, and Zn2+ ions by X-ray photoelectron spectroscopy (XPS) confirmed the higher content of the ions in the surface and subsurface regions of the Fe(III)-modified than of the natural zeolite. XPS depth profiles of the loaded Fe(III)-modified zeolite showed that surface mechanisms of adsorption were dominant in the case of lead and cadmium, while zinc loading on the zeolite sample was governed mainly by an ion-exchange process. Springer-Verlag Berlin Heidelberg, 2014 Fe(III)-zeolite nationallicence Adsorption nationallicence Heavy metals nationallicence Multicomponent solutions nationallicence XPS nationallicence Kinetics nationallicence Thermodynamics nationallicence Mihajlović Marija Belgrade Waterworks and Sewerage, Deligradska 28, 11000, Belgrade, Serbia aut Lazarević Slavica Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut Janković-Častvan Ivona Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut Kovač Janez Institute Jožef Stefan, Jamova 39, 1000, Ljubljana, Slovenia aut Jokić Bojan Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut Janaćković Djordje Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut Petrović Rada Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/2(2015-02-01), 407-419 1618-954X 17:2<407 2015 17 10098 https://doi.org/10.1007/s10098-014-0794-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10098-014-0794-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mihajlović Marija Belgrade Waterworks and Sewerage, Deligradska 28, 11000, Belgrade, Serbia aut NATIONALLICENCE 700 1- Lazarević Slavica Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut NATIONALLICENCE 700 1- Janković-Častvan Ivona Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut NATIONALLICENCE 700 1- Kovač Janez Institute Jožef Stefan, Jamova 39, 1000, Ljubljana, Slovenia aut NATIONALLICENCE 700 1- Jokić Bojan Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut NATIONALLICENCE 700 1- Janaćković Djordje Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut NATIONALLICENCE 700 1- Petrović Rada Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia aut NATIONALLICENCE 773 0- Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/2(2015-02-01), 407-419 1618-954X 17:2<407 2015 17 10098