Article ID Journal Published Year Pages File Type
1696187 Applied Clay Science 2009 4 Pages PDF
Abstract

This paper aims at characterizing the structural evolution and the selectivity of a dioctahedral smectite (i.e. Wyoming montmorillonite) saturated with two different couples of cations. A reference sample was prepared by saturation with Ca2+, Cu2+ or Ni2+. The clay was dispersed in solutions of (Ca2+ and Cu2+) or (Cu2+ and Ni2+). The quantitative analysis of XRD patterns is achieved using an indirect method based on the comparison of XRD experimental patterns to calculated ones. The XRD quantitative analysis shows that for low concentrations of cations the basal spacing value corresponds to Wy–Cu, whereas for high concentration the d001 spacing value can be attributed to Wy–Ca or Wy–Ni. At low concentrations, the exchangeable sites were saturated with low hydration-state cations (i.e.Cu2+) which is characterized by one water layer, whereas at high concentrations, the clay fixes the cations with high hydration state (i.e. Ca2+or Ni2+) characterised by a two water layers.

Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Geochemistry and Petrology
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