Removal of heavy metals from aqueous solutions through natural Greek clay. Selectivity order and isotherms studies

dc.contributor.author	Anastopoulos, I	en
dc.contributor.author	Ioannou, D	en
dc.contributor.author	Kallianou, Ch	en
dc.date.accessioned	2014-06-06T06:52:02Z
dc.date.available	2014-06-06T06:52:02Z
dc.date.issued	2012	en
dc.identifier.issn	00021857	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/5820
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84875954979&partnerID=40&md5=c12b0bb4dfeb19d487dcf8c49280eda3	en
dc.subject	Electivity order	en
dc.subject	Free energy gibbs (Δg°)	en
dc.subject	Isotherms, s	en
dc.subject	Zeolite	en
dc.title	Removal of heavy metals from aqueous solutions through natural Greek clay. Selectivity order and isotherms studies	en
heal.type	journalArticle	en
heal.publicationDate	2012	en
heal.abstract	The present work investigates the adsorptive removal of Zn2+, Ni2+, Cu2+ and Cd2+ from single metal ion aqueous solutions through Greek zeolite (natural and treated), in a range of pH values and initial metal concentrations in the solution. Adsorption was studied in pH 3.0, 5.0, 7.0 and 9.0 in a range concentration of 2 to 50 mg/L. The increase of initial pH and initial metal concentration in the solution led to the increase of adsorbed metal. Treated zeolite had higher adsorption capacity of all studied metals. Sorption experimental data at equilibrium pH 5.0 were fitted to Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin adsorption isotherms. The experimental data fitted better to the Langmuir and Freundlich model. The order of metal ion selectivity on both adsorbents is Zn2+ > Ni2+ > Cu2+> Cd2+. The established order does not correspond to the order of valuse odtheir hydrated radii, electronegativity of free energy of hydration, indicated that another fractor influance the adsorption.The nagative value of Gibbs (ΔG°) were found according to flory huggins KPHwhich shows the spontaneity of the adsorption.	en
heal.journalName	Agrochimica	en
dc.identifier.issue	2	en
dc.identifier.volume	56	en
dc.identifier.spage	98	en
dc.identifier.epage	111	en