期刊
APPLIED CLAY SCIENCE
卷 43, 期 2, 页码 224-227出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2008.09.010
关键词
Smectite; Heavy metals; Selectivity; XRD analysis
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 d(001), 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. (C) 2008 Elsevier B.V. All rights reserved
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据