info:eu-repo/semantics/article
Experimental and theoretical study of Co sorption in clay montmorillonites
Fecha
2018-03Registro en:
Gil Rebaza, Arles Víctor; Montes, María Luciana; Taylor, Marcela Andrea; Errico, Leonardo Antonio; Alonso, Roberto Emilio; Experimental and theoretical study of Co sorption in clay montmorillonites; IOP Publishing; Materials Research Express; 5; 3; 3-2018; 1-21
2053-1591
CONICET Digital
CONICET
Autor
Gil Rebaza, Arles Víctor
Montes, María Luciana
Taylor, Marcela Andrea
Errico, Leonardo Antonio
Alonso, Roberto Emilio
Resumen
Montmorillonite (MMT) clays are 2:1 layered structures which in natural state may allocate different hydrated cations such as M-nH2O (M =Na, Ca, Fe, etc) in its interlayer space. Depending on the capability for ion sorption, these materials are interesting for environmental remediation. In this work we experimentally study the Co sorption in a natural Na-MMT using UV-visible spectrometry and XRD on semi-oriented samples, and then analyze the sorption ability of this clay by means of ab initio calculation performed on pristine MMT. The structural properties of Na-MMT and Co-adsorbed MMT, and the hyperfine parameters at different atomic sites were analyzed and compared with the experimental ones for the first, and for the case of the hyperfine parameters, presented for the first time for the last. The theoretical predictions based on total energy considerations confirm that Co incorporation replacing Na is energetically favorable. Also, the basal spacing d001 experimentally obtained is well reproduced.