Fate of nickel ion in (II-III) hydroxysulphate green rust synthesized by precipitation and coprecipitation

Lucia Helena Garófalo Chaves, Joan Elizabeth Curry, David Andrew Stone, Jon Chorover

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

In order to investigate the efficiency of sulfate green rust (GR2) to remove Ni from solution, GR2 samples were synthesized under controlled laboratory conditions. Some GR2 samples were synthesized from Fe(II) and Fe(III) sulfate salts by precipitation. Other samples were prepared by coprecipitation, of Ni(II), Fe(II) and Fe(III) sulfate salts, i.e., in the presence of Ni. In another sample, Ni(II) sulfate salt was added to pre-formed GR2. After an initial X-ray diffraction (XRD) characterization all samples were exposed to ambient air in order to understand the role of Ni in the transformation of the GR2 samples. XRD was repeated after 45 days. The results showed that Nious GR2 prepared by coprecipitation is isomorphous to Ni-free GR2, i.e. Ni is incorporated into the crystalline structure. Fe(II) was not replaced by Ni(II) in the crystalline structure of GR2 formed prior to exposure to solution-phase Ni. This suggests Ni was adsorbed to the GR2 surface. Sulfate green rust is more efficient in removing Ni from the environment by coprecipitation.

Original languageEnglish (US)
Pages (from-to)813-818
Number of pages6
JournalRevista Brasileira de Ciencia do Solo
Volume31
Issue number4
DOIs
StatePublished - Jan 1 2007

Keywords

  • Isomorphous substitution
  • Nickel adsorption
  • Nickel incorporation
  • X-ray diffraction

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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