title: Use of natural clinoptilolite for the removal of lead, copper and zinc in fixed bed column.
abstract: This work deals with the removal of lead, copper and zinc from aqueous solutions by using natural zeolite (clinoptilolite). Fixed bed experiments were performed, using three different volumetric flow rates of 5, 7 and 10bed volume/h, under a total normality of 0.01N, at initial pH of 4 and ambient temperature (25 degrees C). The removal efficiency increased when decreasing the flow rate and the following selectivity series was found: Pb(2+)>Zn(2+)> or =Cu(2+). Conductivity measurements showed that lead removal follows mainly ion exchange mechanism, while copper and zinc removal follows ion exchange and sorption mechanism as well.
authors.affiliation: National Technical University of Athens, School of Chemical Engineering, Unit of Environmental Science and Technology, 9 Heroon Polytechniou Str., Zographou Campus, 15773 Athens, Greece. marstyl@central.ntua.gr
authors.forename: Marinos A
authors.initials: MA
authors.lastname: Stylianou
authors.forename: Michalis P
authors.initials: MP
authors.lastname: Hadjiconstantinou
authors.forename: Vasilis J
authors.initials: VJ
authors.lastname: Inglezakis
authors.forename: Konstantinos G
authors.initials: KG
authors.lastname: Moustakas
authors.forename: Maria D
authors.initials: MD
authors.lastname: Loizidou
mesh_terms: D003300:Copper / Q000737:chemistry*; D004553:Electric Conductivity; D006115:Greece; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D007854:Lead / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: C083175:clinoptilolite; D017641:Zeolites; D007854:Lead; D003300:Copper; D015032:Zinc