Effect of pore clogging on kinetics of lead uptake by clinoptilolite

Inglezakis, VJ; Diamandis, NA; Loizidou, MD; Grigoropoulou, HP

dc.contributor.author	Inglezakis, VJ	en
dc.contributor.author	Diamandis, NA	en
dc.contributor.author	Loizidou, MD	en
dc.contributor.author	Grigoropoulou, HP	en
dc.date.accessioned	2014-03-01T01:14:33Z
dc.date.available	2014-03-01T01:14:33Z
dc.date.issued	1999	en
dc.identifier.issn	0021-9797	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13140
dc.subject	Diffusion coefficients	en
dc.subject	Ion exchange	en
dc.subject	Lead uptake	en
dc.subject	Pore clogging	en
dc.subject	Zeolites	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.other	clinoptilolite	en
dc.subject.other	ion exchange resin	en
dc.subject.other	iron	en
dc.subject.other	lead	en
dc.subject.other	unclassified drug	en
dc.subject.other	accuracy	en
dc.subject.other	article	en
dc.subject.other	channel gating	en
dc.subject.other	diffusion coefficient	en
dc.subject.other	experimental model	en
dc.subject.other	ion exchange	en
dc.subject.other	oscillation	en
dc.subject.other	particle size	en
dc.subject.other	priority journal	en
dc.subject.other	transport kinetics	en
dc.subject.other	water treatment	en
dc.title	Effect of pore clogging on kinetics of lead uptake by clinoptilolite	en
heal.type	journalArticle	en
heal.identifier.primary	10.1006/jcis.1999.6247	en
heal.identifier.secondary	http://dx.doi.org/10.1006/jcis.1999.6247	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	The kinetics of lead-sodium ion exchange using pretreated natural clinoptilolite are investigated, more specifically the influence of agitation (0, 210, and 650 rpm) on the limiting step of the overall process, for particle sizes of 0.63-0.8 and 0.8-1 mm at ambient temperature and initial lead solutions of 500 mg l(-1) without pH adjustment. The isotopic exchange model is found to fit the ion exchange process. Particle diffusion is shown to be the controlling step for both particle sizes under agitation, while in the absence of agitation film diffusion is shown to control. The ion exchange process effective diffusion coefficients are calculated and found to depend strongly on particle size in the case of agitation at 210 rpm and only slightly on particle size at 650 rpm. Lead uptake rates are higher for smaller particles only at rigorous agitation, while at mild agitation the results are reversed. These facts are due to partial clogging of the pores of the mineral during the grinding process. This is verified through comparison of lead uptake rates for two samples of the same particle size, one of which is rigorously washed for a certain time before being exposed to the ion exchange. (C) 1999 Academic Press.	en
heal.publisher	ACADEMIC PRESS INC	en
heal.journalName	Journal of Colloid and Interface Science	en
dc.identifier.doi	10.1006/jcis.1999.6247	en
dc.identifier.isi	ISI:000081098400008	en
dc.identifier.volume	215	en
dc.identifier.issue	1	en
dc.identifier.spage	54	en
dc.identifier.epage	57	en