Ion exchange of zeolite Na-P-c with Pb2+, Zn2+, and Ni2+ ions

Moirou, A; Vaxevanidou, A; Christidis, GE; Paspaliaris, I

dc.contributor.author	Moirou, A	en
dc.contributor.author	Vaxevanidou, A	en
dc.contributor.author	Christidis, GE	en
dc.contributor.author	Paspaliaris, I	en
dc.date.accessioned	2014-03-01T01:49:55Z
dc.date.available	2014-03-01T01:49:55Z
dc.date.issued	2000	en
dc.identifier.issn	0009-8604	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25970
dc.subject	heavy metals	en
dc.subject	ion exchange	en
dc.subject	perlite	en
dc.subject	selectivity	en
dc.subject	selectivity coefficient	en
dc.subject	zeolite P-c	en
dc.subject	zeolitization	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Mineralogy	en
dc.subject.classification	Soil Science	en
dc.subject.classification	Water Resources	en
dc.subject.other	PERLITE	en
dc.title	Ion exchange of zeolite Na-P-c with Pb2+, Zn2+, and Ni2+ ions	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	This paper examines the ion-exchange properties of synthetic zeolite Na-P-c,, which was produced from perlite-waste fines and has a SiO2:Al2O3 ratio of 4.45:1 and a cation-exchange capacity (CEC) of 3.95 meg g(-1). Although equilibrium is attained rapidly for all three metals, exchange is incomplete, with A(c)(max) (maximum equilibrium fraction of the metal in the zeolite) being 0.95 for Pb, 0.76 for Zn, and 0.27 for Ni. In both Na --> 1/2Pb and Na --> 1/2Zn exchange, the normalized selectivity coefficient is virtually constant for (N)A(c) (normalized equilibrium fraction of the metal in the zeolite) values of less than or equal to0.6, suggesting a pronounced homogeneity of the available exchange sites. The Gibbs standard free energy, DeltaG(degrees), of the Na --> 1/2Pb exchange calculated from the normalized selectivity coefficient is -3.11 kJ eq(-1) and, for the Na --> 1/2Zn exchange, it is 2.75 kJ eq(-1). Examination of the solid exchange products with X-ray diffraction (XRD) revealed a possible decrease in crystallinity of zeolite Pb-P-c as suggested by the significant broadening and disappearance of diffraction lines. This decrease is associated with a reduction of pore opening, as indicated from Fourier-transform infrared analysis (FTIR), which in turn results in a decrease of the amount of zeolitic water. Thermogravimetric-differential thermogravimetric (TG-DTG) analysis showed that water loss occurs in three steps, the relative significance of which depends on the type of exchangeable cation and subsequently on the type of complex formed with the cation and/or the zeolite channels. Zeolite Na-P-c might be utilized in environmental applications, such as the treatment of acid-mine drainage and electroplating effluents.	en
heal.publisher	CLAY MINERALS SOCIETY	en
heal.journalName	CLAYS AND CLAY MINERALS	en
dc.identifier.isi	ISI:000165140600009	en
dc.identifier.volume	48	en
dc.identifier.issue	5	en
dc.identifier.spage	563	en
dc.identifier.epage	571	en