Equilibrium and kinetic ion exchange studies of Pb2+, Cr3+, Fe3+ and Cu2+ on natural clinoptilolite

Inglezakis, VJ; Loizidou, MD; Grigoropoulou, HP

dc.contributor.author	Inglezakis, VJ	en
dc.contributor.author	Loizidou, MD	en
dc.contributor.author	Grigoropoulou, HP	en
dc.date.accessioned	2014-03-01T01:17:49Z
dc.date.available	2014-03-01T01:17:49Z
dc.date.issued	2002	en
dc.identifier.issn	0043-1354	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14680
dc.subject	Clinoptilolite	en
dc.subject	Fixed beds	en
dc.subject	Heavy metals	en
dc.subject	Ion exchange	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Diffusion	en
dc.subject.other	Ion exchange	en
dc.subject.other	Isotherms	en
dc.subject.other	Selectivity series	en
dc.subject.other	Water analysis	en
dc.subject.other	chromium	en
dc.subject.other	copper ion	en
dc.subject.other	ferric ion	en
dc.subject.other	heavy metal	en
dc.subject.other	lead	en
dc.subject.other	zeolite	en
dc.subject.other	clinoptilolite	en
dc.subject.other	fixed bed	en
dc.subject.other	heavy metal	en
dc.subject.other	ion exchange	en
dc.subject.other	article	en
dc.subject.other	diffusion coefficient	en
dc.subject.other	flow rate	en
dc.subject.other	ion exchange	en
dc.subject.other	isotherm	en
dc.subject.other	kinetics	en
dc.subject.other	priority journal	en
dc.subject.other	chemistry	en
dc.subject.other	temperature	en
dc.subject.other	water pollutant	en
dc.subject.other	Ion Exchange	en
dc.subject.other	Kinetics	en
dc.subject.other	Metals, Heavy	en
dc.subject.other	Temperature	en
dc.subject.other	Water Pollutants	en
dc.subject.other	Zeolites	en
dc.subject.other	Sigmoidea	en
dc.title	Equilibrium and kinetic ion exchange studies of Pb2+, Cr3+, Fe3+ and Cu2+ on natural clinoptilolite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0043-1354(01)00504-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0043-1354(01)00504-8	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	In the present study ion exchange of Pb2+, Cu2+, Fe3+ and Cr3+ on natural clinoptilolite is examined at 27 +/- 1degreesC and initial concentration of 10 meq/dm(3). Equilibrium is favorable for Pb2+, unfavorable for Cu2+ and sigmoid for Cr3+ and Fe3+. Selectivity series deduced from equilibrium isotherms is Pb2+ >Cr3+ > Fe3+ > Cu2+ while when maximum exchange levels (MELs) are considered, selectivity series is Pb2+ > Cr3+ congruent to > F manifests the higher value of diffusion coefficient in the clinoptilolite particles among the metals studied, equal to 1.40 x 10(-9) cm(2)/s. According to the fixed bed experiments the upflow rate (5-15 Bed Volumes (BV)) is influencing the breakthrough point for all metals studied. The breakthrough point varies between 12.3 BV for Pb2+ and 1.18 for Cu2+. Flow rate is also influencing the operating capacity, giving values between 0.433 meq/g(chnoptilolite) for Pb2+ and 0.053 for Fe3+. Breakthrough point values confirm the selectivity order deduced from the equilibrium isotherms, while operating capacity values confirm the selectivity order deduced from MEL experiments. (C) 2002 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Water Research	en
dc.identifier.doi	10.1016/S0043-1354(01)00504-8	en
dc.identifier.isi	ISI:000176940600013	en
dc.identifier.volume	36	en
dc.identifier.issue	11	en
dc.identifier.spage	2784	en
dc.identifier.epage	2792	en