Subscribe Now Subscribe Today
Science Alert
 
Blue
   
Curve Top
Asian Journal of Applied Sciences
  Year: 2012 | Volume: 5 | Issue: 7 | Page No.: 460-472
DOI: 10.3923/ajaps.2012.460.472
 
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Iron Speciation in the Clays Consummated in Côte d’Ivoire: A Transmission Mössbauer Spectroscopy Study

V. Coulibaly, J. Sei, S. Oyetola, Moulay T. Sougrati and J.C. Jumas

Abstract:
Iron is present in clay minerals under various forms and influences their properties by virtue of changes in its redox state in their crystal structure. The purpose of this work was to determine the iron statutes in the clays consummated in Côte d’Ivoire for their therapeutic virtues. We used 57Fe Transmission Mössbauer Spectroscopy which is a powerful method to characterize local environment of Fe in iron-bearing minerals. In the green clay of Anyama (AVA) dominated by chlorite, illite and quartz with minor amounts of other minerals including smectite, Mössbauer spectra showed that at least 60% of the total iron was present as Fe2+ in two different octahedral sites characterized by δ = 1.09-1.13 mm sec-1 and ΔEq = 2.34-2.65 mm sec-1. For Fe3+ cation, the fit revealed two distorted octahedral (δ = 0.28-0.43 mm sec-1 and ΔEq = 0.78-1.1 mm sec-1) and one tetrahedral (δ = 0.15 mm sec-1 and ΔEq = 0.16 mm sec-1) sites. The clays from Bingerville (LBF, LVF and LJFF) were dominated by kaolinite with relative important amounts of quartz, illite and goethite. Their room temperature Mössbauer spectra were characterized by a broad doublet indicating that iron was present as Fe3+ in octahedral site (δ = 0.37-0.4 mm sec-1 and ΔEq = 0.45-0.58 mm sec -1). Samples LBF and LVF contained small amounts of Fe2+ while an intermediate valence was observed in sample LVF. Sample LJFF was rich in goethite presenting a superparamagnetic behaviour at room temperature but order magnetically at liquid nitrogen temperature.
PDF Fulltext XML References Citation Report Citation
 RELATED ARTICLES:
  •    Measurement of Natural Radioactivity in the Clays Consummated in Côte d’Ivoire using Gamma-ray Spectrometry
How to cite this article:

V. Coulibaly, J. Sei, S. Oyetola, Moulay T. Sougrati and J.C. Jumas, 2012. Iron Speciation in the Clays Consummated in Côte d’Ivoire: A Transmission Mössbauer Spectroscopy Study. Asian Journal of Applied Sciences, 5: 460-472.

DOI: 10.3923/ajaps.2012.460.472

URL: https://scialert.net/abstract/?doi=ajaps.2012.460.472

COMMENT ON THIS PAPER
 
 
 

 

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 

Curve Bottom