Lead and cadmium removal by ion exchange

Maliou, E; Malamis, M; Sakellarides, PO

dc.contributor.author	Maliou, E	en
dc.contributor.author	Malamis, M	en
dc.contributor.author	Sakellarides, PO	en
dc.date.accessioned	2014-03-01T02:40:57Z
dc.date.available	2014-03-01T02:40:57Z
dc.date.issued	1992	en
dc.identifier.issn	0273-1223	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30292
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0026539371&partnerID=40&md5=8dd3c0efbd162192c7f3aaf23130ac27	en
dc.subject	ION EXCHANGE	en
dc.subject	ZEOLITE	en
dc.subject	CLINOPTILOLITE	en
dc.subject	HEAVY METAL REMOVAL	en
dc.subject	WATER TREATMENT	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Cadmium Compounds--Removal	en
dc.subject.other	Wastewater Treatment--Lead Removal	en
dc.subject.other	Zeolites	en
dc.subject.other	Clinoptilolite	en
dc.subject.other	Grain Sizes	en
dc.subject.other	Metal Uptake	en
dc.subject.other	Solution Temperatures	en
dc.subject.other	Wastewater Treatment	en
dc.subject.other	cadmium	en
dc.subject.other	industrial effluent	en
dc.subject.other	lead	en
dc.subject.other	sodium	en
dc.subject.other	zeolite	en
dc.subject.other	conference paper	en
dc.subject.other	ion exchange	en
dc.subject.other	kinetics	en
dc.subject.other	temperature	en
dc.subject.other	waste water management	en
dc.title	Lead and cadmium removal by ion exchange	en
heal.type	conferenceItem	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	The ion exchange properties of the zeolites can be used to remove certain ions from the effluents. In this work a natural clinoptilolite has been examined systematically in order to evaluate whether this low cost mineral can be employed for the removal of the metals lead and cadmium which are very toxic, even at very low concentrations. Studies were performed under various conditions such as presence of different cations (Pb, Cd, Na), zeolite grain size, solution temperature. The results obtained indicate that the size of the zeolite does not affect the actual metal uptake at the equilibrium point, but the metal removal is greatly affected when the contact of the solid/liquid phases is short, a very essential parameter for the waste water treatment. For a short contact time the metal quantities removed using small grain size is nearly doubled. The same pattern is followed at higher temperatures, though a slight increase is observed for both zeolite grain sizes and both metals, lead and cadmium. At equilibrium half of the theoretical exchange capacity of the zeolite is used, approximately 1.4 meq/g for lead and 1.1 meq/g for cadmium. The kinetic curves show very clearly the selectivity of the zeolite for the Pb ions but also significant amounts of cadmium are removed as well.The ion exchange properties of the zeolites can be used to remove certain ions from the effluents. In this work a natural clinoptilolite has been examined systematically in order to evaluate whether this low cost mineral can be employed for the removal of the metals lead and cadmium which are very toxic, even at very low concentrations. Studies were performed under various conditions such as presence of different cations (Pb, Cd, Na), zeolite grain size, solution temperature. The results obtained indicate that the size of the zeolite does not affect the actual metal uptake at the equilibrium point, but the metal removal is greatly affected when the contact of the solid/liquid phases is short, a very essential parameter for the waste water treatment. For a short contact time the metal quantities removed using small grain size is nearly doubled. The same pattern is followed at higher temperatures, though a slight increase is observed for both zeolite grain sizes and both metals, lead and cadmium. At equilibrium half of the theoretical exchange capacity of the zeolite is used, approximately 1.4 meq/g for lead and 1.1 meq/g for cadmium. The kinetic curves show very clearly the selectivity of the zeolite for the Pb ions but also significant amounts of cadmium are removed as well.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Water Science and Technology	en
dc.identifier.isi	ISI:A1992HP35400020	en
dc.identifier.volume	25	en
dc.identifier.issue	1	en
dc.identifier.spage	133	en
dc.identifier.epage	138	en