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Mineralogical and physico-chemical characterization of Mbodiene palygorskite for pharmaceutical applications

This contribution provides a wide morphological, mineralogical, chemical and physical characterization of Mbodiene palygorskite (Senegal), to serve as a basis for the formulation of antidiarrheal and cosmetic products. Data are compared with other palygorskite deposits, either in Senegal or on other continents. Qualitative total rock XRD, semi-quantitative XRD of the clay fraction and quantitative X-Ray fluorescence (XRF) show the presence of 72%wt palygorskite (±2%wt), 13%wt montmorillonite (±2%wt), 8%wt dolomite (±2%wt), 5%wt quartz SiO2 (±2%wt) and 2%wt inter-stratified illite/smectite (±2%wt). Coupled SEM þ EDX and TEM þ EDX confirm the presence of fibrous palygorskite, with greater amounts of Mg than Al, and Fe substitution to Mg and Al, interspersed with dolomite cubes CaMg(CO3)2. The presence of carbonates in Mbodiene palygorskite may limit its use in the Pharmacopoeia, and make its purification necessary. A specific signature of Mbodiene palygorskite, relevant to the palygorskite family, is deduced from both FTIR and TGA analysis. In terms of physico-chemical characterization, Mbodiene palygorskite has usual values when compared to the literature (for its specific surface area, specific gravity, compressibility and Haussner indexes, CEC, loss on ignition, etc.). After grinding (down to a peak grain size of 500 nm), Mbodiene palygorskite is considered a normal clay, extremely highly plastic, with hard consistency owing to the values of its Atterberg plasticity and liquidity limits, with good flowability owing to its compressibility and Haussner indexes. Its physical characteristics are suitable for manufacturing pastes and colloidal suspensions.

Auteur(s) : Sylla Gueye R., Davy C.A., Cazaux F., Ndiaye A., Diop M.B., Skoczylas F., Wele A.
Pages : 186-203
Année de publication : 2017
Revue : Journal of African Earth Sciences
N° de volume : 135
Type : Article
Statut Editorial : ELSEVIER
Mise en ligne par : SYLLA/GUEYE Rokhaya