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Combining DLS, XRD, SEM-EDAX and EXAFS in the study of Zn(II) retention on a palygorskitic clay

Published online by Cambridge University Press:  09 July 2018

C. Aisa ,
R. A. Alvarez-Puebla ,
J. Blasco ,
J. C. Echeverría  and
J. J. Garrido
C. Aisa
Affiliation:
Departamento de Química Aplicada, Universidad Pública de Navarra, Campus Arrosadía, 31006, Pamplona
R. A. Alvarez-Puebla
Affiliation:
Departamento de Química Aplicada, Universidad Pública de Navarra, Campus Arrosadía, 31006, Pamplona
J. Blasco
Affiliation:
ICMA and Departamento de Física de la Materia Condensada, CSIC and Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
J. C. Echeverría
Affiliation:
Departamento de Química Aplicada, Universidad Pública de Navarra, Campus Arrosadía, 31006, Pamplona
J. J. Garrido*
Affiliation:
Departamento de Química Aplicada, Universidad Pública de Navarra, Campus Arrosadía, 31006, Pamplona
*
*E-mail: j.garrido@unavarra.es
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Abstract

Clay materials play a key role in determining the retention capacity of a soil, and are widely used in waste treatments. One of the most commonly used clays is palygorskite. The aim of this research is to determine the chemical species formed by Zn when retained in a palygorskitic clay material. Adsorption isotherm analysis is useful in studying the retention process, because it provides a macroscopic view of the retention phenomena. Complementary techniques are needed in order to study the different retention processes. Sorption isotherms of Zn on palygorskitic clay were carried out; the supernatant was analysed by means of dynamic light scattering (DLS) and the residues by using X-ray diffraction (XRD), scanning electron microscopy-energy dispersive angle X-ray (SEM-EDAX)analysis and extended X-ray absorption fine structure (EXAFS). Isotherm analysis shows that the global retention process could be due to the sum of two separate processes, adsorption and surface precipitation via solid-solution. This is supported by DLS, which shows that ζ potential increases as the Zn(II) is retained onto clay surfaces but remains constant during the precipitation process. The XRD pattern corresponding to the Zn-clay system showed weak new peaks, probably from zincite. The microanalysis by X-ray fluorescence of several spots selected for their different electronic densities indicated that the retained Zn was randomly distributed across the clay surface. Analysis by EXAFS supports the hypothesis of retention via adsorption and solid-solution surface precipitation.

Keywords

zincsorptionprecipitationpalygorskiteDLSXRDSEM-EDAXEXAFS
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 2 , June 2005 , pp. 205 - 212
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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