Incorporação de níquel em FE (II-III) grenn rust hidroxisulfato: Efeito sobre a estrutura cristalina e produtos de oxidação

Translated title of the contribution: Nickel incorporation in FE(II, III) hydroxysulfate green Rust: Effect on crystal lattice spacing and oxidation products

Lucia Helena Garófalo Chaves, Joan Elizabeth Curry, David Andrew Stone, Michael D. Carducci, Jon Chorover

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Ni(II)-Fe(II)-Fe(III) layered double hydroxides (LDH) or Ni-containing sulfate green rust (GR2) samples were prepared from Ni(II), Fe(II) and Fe(III) sulfate salts and analyzed with X ray diffraction. Nickel is readily incorporated in the GR2 structure and forms a solid solution between GR2 and a Ni(II)-Fe(III) LDH. There is a correlation between the unit cell a-value and the fraction of Ni(II) incorporated into the Ni(II)-GR2 structure. Since there is strong evidence that the divalent/trivalent cation ratio in GR2 is fixed at 2, it is possible in principle to determine the extent of divalent cation substitution for Fe(II) in GR2 from the unit cell a-value. Oxidation forms a mixture of minerals but the LDH structure is retained if at least 20 % of the divalent cations in the initial solution are Ni(II). It appears that Ni(II) is incorporated in a stable LDH structure. This may be important for two reasons, first for understanding the formation of LDHs, which are anion exchangers, in the natural environment. Secondly, this is important for understanding the fate of transition metals in the environment, particularly in the presence of reduced Fe compounds.

Translated title of the contributionNickel incorporation in FE(II, III) hydroxysulfate green Rust: Effect on crystal lattice spacing and oxidation products
Original languagePortuguese
Pages (from-to)1115-1123
Number of pages9
JournalRevista Brasileira de Ciencia do Solo
Volume33
Issue number5
DOIs
StatePublished - 2009

Keywords

  • Isomorphous substitution
  • LDH
  • Layered double hydroxide
  • X ray diffraction

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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