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The mechanism of iron binding processes in erionite fibres.
Pacella, Alessandro; Cremisini, Carlo; Nardi, Elisa; Montereali, Maria Rita; Pettiti, Ida; Ballirano, Paolo.
Afiliação
  • Pacella A; Department of Earth Sciences, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185, Roma, Italy.
  • Cremisini C; ENEA, C. R. Casaccia, Via Anguillarese 301, I-00123, Roma, Italy.
  • Nardi E; ENEA, C. R. Casaccia, Via Anguillarese 301, I-00123, Roma, Italy.
  • Montereali MR; ENEA, C. R. Casaccia, Via Anguillarese 301, I-00123, Roma, Italy.
  • Pettiti I; Department of Chemistry, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185, Roma, Italy.
  • Ballirano P; Department of Earth Sciences, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185, Roma, Italy. paolo.ballirano@uniroma1.it.
Sci Rep ; 7(1): 1319, 2017 05 02.
Article em En | MEDLINE | ID: mdl-28465523
ABSTRACT
Fibrous erionite-Na from Rome (Oregon, USA) was K-exchanged and characterized from the structural point of view. In addition, the modifications experienced after contact with a Fe(II) source were investigated for evaluating if the large potassium ions, blocking off nearly all the erionite cavity openings, might prevent the Fe(II) binding process, which is currently assumed to be one of the reasons of the toxicity of erionite. The K-exchanged sample had a 95% reduction of the BET surface area indicating that it behaves as a mesoporous material. Exchanged K is segregated at K2 and at OW sites commonly occupied by H2O. The latter K cations provide a relevant contribution to the reduction of the surface area. Surprisingly, despite the collapse of its surface area the sample preserves the tendency to bind Fe(II). Therefore, yet in the case of a peculiar and potentially hostile structural environment the Fe(II) ion-exchange process has essentially the same kinetics observed in a typical erionite sample. This is a clear evidence of the very limited effect of the chemical composition of erionite on the Fe(II) binding process and reasonably it does not play a significant role in its toxicity.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2017 Tipo de documento: Article