Physico-chemical and mineralogical characterization
of a Moroccan bentonite (Trebia) and determination
of its nature and its chemical structure
A. Er-ramly*, A. Ider
Laboratoire de procédés et de l'exploitation des ressources naturelles, l'Environnement et les matériaux,
Département de Chimie Appliquée et Environnement.
L'équipe de développement, la structure et les propriétés des matériaux,
* Corresponding author: E-mail: firstname.lastname@example.orgemail@example.com
Received: 18 May 2011; revised version accepted: 28 August 2011
The X-ray diffraction analysis supplemented by gravimetric analysis showed that Trebia bentonite is primarily smectite (63 wt %) with the presence of feldspar (30 wt%), magnetite (5 wt%) and an amorphous iron oxide in the form of scales (2 wt%). It has a specific surface area by using surface area analyzer and N2 gas was used as adsorbate under atmosphere of 37 m²/g, and a cation- exchange capacity (CEC) of 89 meq/100g. in sheets of smectite saturated with K allows to highlight the heterogeneity of charge and they are closed and their presence reduces the CEC, the structural formula calculated for bentonite has shown that the beidellite has a high charge density and has a rich iron. SEM-EDX, X-ray, chemical analysis and Infrared spectroscopy demonstrated that this beideliite contains iron Fe3 + in the octahedral sheet. The origin of the charge sheets is tetrahedral (Si3.6 Al0.33) with total charge 0.48 from which 0.33 (68.7%) occurring in tetrahedral sheet, the beidellitic character of the smectite is present (more than 50%) with a phase rich in iron.