Modeling of ion exchange of Pb2+ in fixed beds of clinoptilolite

Inglezakis, VJ; Grigoropoulou, HP

dc.contributor.author	Inglezakis, VJ	en
dc.contributor.author	Grigoropoulou, HP	en
dc.date.accessioned	2014-03-01T01:19:17Z
dc.date.available	2014-03-01T01:19:17Z
dc.date.issued	2003	en
dc.identifier.issn	1387-1811	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15402
dc.subject	ion exchange	en
dc.subject	fixed bed models	en
dc.subject	diffusion coefficient	en
dc.subject	capacity	en
dc.subject	Langmuir isotherm	en
dc.subject.classification	Chemistry, Applied	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Nanoscience & Nanotechnology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	CONSTANT-PATTERN CONDITIONS	en
dc.subject.other	NATURAL CLINOPTILOLITE	en
dc.subject.other	DIFFUSION KINETICS	en
dc.subject.other	AMMONIA REMOVAL	en
dc.subject.other	ADSORPTION	en
dc.subject.other	ZEOLITE	en
dc.subject.other	EQUILIBRIUM	en
dc.subject.other	ADSORBERS	en
dc.subject.other	SYSTEMS	en
dc.subject.other	METALS	en
dc.title	Modeling of ion exchange of Pb2+ in fixed beds of clinoptilolite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S1387-1811(03)00374-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S1387-1811(03)00374-3	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Ion exchange of Pb2+ on natural clinoptilolite in fixed bed and batch operations has been studied and simple models on experimental data have been applied. The operations are conducted at ambient temperature, an initial concentration of 0.01 N and at pH 4. Paterson's model is used to describe batch kinetics, the Langmuir isotherm is used to correlate equilibrium data and a solid diffusion controlled process is used to describe the fixed bed operation. The evaluated operating capacity is in the range of 0.21-1 meq/g and the diffusion coefficient is in the range of (0.07-5.4) x 10(-12) m(2)/s. The experimental results obtained put the basic theory under question. According to these experiments, the capacity and diffusion coefficient in fixed bed systems are flow dependent and different from those measured in the batch-reactor systems. This could be explained if the type of experimental setup influenced both the equilibrium isotherm and the system behavior. (C) 2003 Published by Elsevier Inc.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	MICROPOROUS AND MESOPOROUS MATERIALS	en
dc.identifier.doi	10.1016/S1387-1811(03)00374-3	en
dc.identifier.isi	ISI:000184324100026	en
dc.identifier.volume	61	en
dc.identifier.issue	1-3	en
dc.identifier.spage	273	en
dc.identifier.epage	282	en