Silvetti, Margherita (2010) Studio dell'interazione dell'arseniato e del fosfato con i fanghi rossi, residui della lavorazione della bauxite, attraverso tecniche chimiche, spettroscopiche e termiche. Doctoral Thesis.
The aim of this thesis was to study the interaction mechanisms between an inorganic sorbent, red
mud (RM), and two different anions, arsenate and phosphate.
Adsorption isotherms and sequential extraction procedures were firstly used to investigate these
interactions. Sorption isotherms of arsenate and phosphate on RM, at pH 4.0, 7.0 and 10.0, were
obtained while a sequential extraction procedure using H2O, (NH4)2SO4, NH4H2PO4, NH4
+- oxalate + ascorbic acid, was applied to saturated RM samples to determine the interaction
strength between respective anions and sorbent. Moreover, a physical, chemical and mineralogical
characterization of not treated RM (alumina industry by-product) and RM exchanged with anions
was carried out using spectroscopic techniques (FT–IR spectroscopy and X-Ray diffraction) and
thermal analysis (TG and DTG) to evaluate the general suitability of RM as sorbent of phosphate and
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