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

Revista Brasileira de Ciência do Solo

Lucia Helena Garófalo Chaves²  Joan Elizabeth Curry¹  David Andrew Stone¹  Jon Chorover¹ 

[1] ,Universidade Federal de Campina Grande Department of Agricultural Engineering Campina Grande PB ,Brazil

关键词: nickel incorporation;    nickel adsorption;    X-ray diffraction;    isomorphous substitution;    incorporação de níquel;    adsorção de níquel;    difração de raios X;    substituição isomórfica;   

DOI  :  10.1590/S0100-06832007000400021

来源: SciELO

【 摘 要 】

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.

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