Thorium removal by different adsorbents

Metaxas, M; Kasselouri-Rigopoulou, V; Galiatsatou, P; Konstantopoulou, C; Oikonomou, D

dc.contributor.author	Metaxas, M	en
dc.contributor.author	Kasselouri-Rigopoulou, V	en
dc.contributor.author	Galiatsatou, P	en
dc.contributor.author	Konstantopoulou, C	en
dc.contributor.author	Oikonomou, D	en
dc.date.accessioned	2014-03-01T01:19:39Z
dc.date.available	2014-03-01T01:19:39Z
dc.date.issued	2003	en
dc.identifier.issn	0304-3894	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15635
dc.subject	Activated carbon	en
dc.subject	Ion exchange	en
dc.subject	Langmuir isotherm	en
dc.subject	Thorium adsorption	en
dc.subject	Zeolites	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	Activated carbon	en
dc.subject.other	Adsorbents	en
dc.subject.other	Adsorption	en
dc.subject.other	Ion exchange	en
dc.subject.other	Solutions	en
dc.subject.other	Thorium	en
dc.subject.other	Zeolites	en
dc.subject.other	Adsorptive materials	en
dc.subject.other	Radioactive waste disposal	en
dc.subject.other	activated carbon	en
dc.subject.other	adsorbent	en
dc.subject.other	carbon	en
dc.subject.other	clinoptilolite	en
dc.subject.other	iodine	en
dc.subject.other	mordenite	en
dc.subject.other	sodium ion	en
dc.subject.other	solvent	en
dc.subject.other	thorium	en
dc.subject.other	unclassified drug	en
dc.subject.other	zeolite	en
dc.subject.other	aqueous solution	en
dc.subject.other	pollutant removal	en
dc.subject.other	radioactive waste	en
dc.subject.other	thorium	en
dc.subject.other	adsorption	en
dc.subject.other	aqueous solution	en
dc.subject.other	article	en
dc.subject.other	Adsorption	en
dc.subject.other	Carbon	en
dc.subject.other	Ion Exchange	en
dc.subject.other	Models, Theoretical	en
dc.subject.other	Radioactive Waste	en
dc.subject.other	Temperature	en
dc.subject.other	Thorium	en
dc.subject.other	Zeolites	en
dc.title	Thorium removal by different adsorbents	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0304-3894(02)00245-5	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0304-3894(02)00245-5	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	The removal of radiotoxic Th4+ from aqueous solutions has been explored using two different groups of adsorptive materials (e.g. two activated carbons and four zeolites-two natural and two synthetic). The activated carbons were prepared from solvent extracted olive pulp (SEOP) and olive stone (OS) by a two-step physical activation method with steam. They were characterized by N-2 at 77 K adsorption, Hg porosimetry and by determination of their iodine number. All carbons prepared are of the H-type (e.g. contain mainly basic surface oxides) confirmed by the results of the Boehm's method. The natural zeolites, clinoptilolite (NaCLI) and mordenite (NaMOR), were pretreated with Na+ before the adsorption experiments, while the synthetic ones, NaX and NaA, were provided in their commercial sodium form. The natural zeolites, NaCLI and NaMOR, utilized 11.5 and 38.6% of the theoretical ion-exchange capacity, based on Al content, respectively, while NaX and NaA utilized 41.5 and 45.9%, respectively. The activated carbons showed better removal capability than NaCLI. NaMOR, showed comparable results to the carbon originated from OS, but lower removal capability than the carbon originated from SEOP The synthetic zeolites showed the highest removal ability for thorium ions due to their increased ion-exchange capacity because of their cleaner and larger framework channels and their higher number of ion-exchange sites. The carbons adsorption capacity mainly depends on the content and nature of functional surface groups. The adsorption data were fitted to Langmuir and Freundlich models. The former achieved best fits and was further applied to obtain the respective Langmuir constant and maximum adsorption capacity for each system. (C) 2002 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Hazardous Materials	en
dc.identifier.doi	10.1016/S0304-3894(02)00245-5	en
dc.identifier.isi	ISI:000181089500006	en
dc.identifier.volume	97	en
dc.identifier.issue	1-3	en
dc.identifier.spage	71	en
dc.identifier.epage	82	en