SciELO - Scientific Electronic Library Online

 
vol.31 número4Contaminação do solo com antraceno e creosoto e o crescimento vegetal e a colonização micorrízica pelo Glomus etunicatumComportamento sortivo, individual e competitivo, de metais pesados em Latossolos com mineralogia contrastante índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

CHAVES, Lucia Helena Garófalo; CURRY, Joan Elizabeth; STONE, David Andrew  e  CHOROVER, Jon. Fate of nickel ion in (II-III) hydroxysulphate green rust synthesized by precipitation and coprecipitation. Rev. Bras. Ciênc. Solo [online]. 2007, vol.31, n.4, pp.813-818. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832007000400021.

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.

Palavras-chave : nickel incorporation; nickel adsorption; X-ray diffraction; isomorphous substitution.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons