dc.creatorRojas Delgado, Ricardo
dc.date.accessioned2017-12-22T13:42:03Z
dc.date.accessioned2018-11-06T14:38:22Z
dc.date.available2017-12-22T13:42:03Z
dc.date.available2018-11-06T14:38:22Z
dc.date.created2017-12-22T13:42:03Z
dc.date.issued2014-01
dc.identifierCopper, lead and cadmium removal by Ca Al layered double hydroxides; Elsevier Science; Applied Clay Science; 87; 1-2014; 254-259
dc.identifier0169-1317
dc.identifierhttp://hdl.handle.net/11336/31354
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1888472
dc.description.abstractLayered double hydroxides are increasingly studied as heavy metal scavengers due to their acid/base buffering capacity that leads to hydroxide precipitation. Their intercalation with ligands such as edta also provides active sites for heavy metal chelation to these solids. In this work, both mechanisms are studied in Ca–Al layered double hydroxides (LDHs) with a Friedel's salt layered structure and intercalated with either nitrate (Ca–Al–NO3) or [Ca(edta)]2 − (Ca–Al–[Ca(edta)]). With this aim, the acid–base buffering capacity of these solids was determined and their removal behavior studied as a function of equilibrium concentration and pH. The solids presented high instability, Ca2 + ions being selectively leached at pH values as high as 8. As a consequence, high affinity and large removal capacity of Cu2 +, Cd2 + and Pb2 + were obtained for Ca–Al–NO3 by a hydroxide precipitation mechanism. The removal capacity of Ca–Al–[Ca(edta)] was quite similar, however, a portion of heavy metal ions was solubilized due to [Ca(edta)]2 − release. The heavy metal hydroxides obtained by the Ca–Al LDH removal action produced immobilization at pH values lower than those produced by simple alkalinization.
dc.languageeng
dc.publisherElsevier Science
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.clay.2013.11.015
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0169131713003840
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectFriedel's salts
dc.subjectHeavy metal removal
dc.subjectAcid–base buffering
dc.subjectPrecipitation
dc.subjectChelation
dc.titleCopper, lead and cadmium removal by Ca Al layered double hydroxides
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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