Author/Authors :
EI Samrani, A.G Université Saint Esprit de Kaslik/Conseil National de la Recherche Scientifique - Faculté des Sciences et de Génie Informatique /Commission Libanaise de I Energie Atomique - Départernent de Chimie-Biochimie, Liban , Ouaini, N Université Saint Esprit de Kaslik - Faculté des Sciences et de Génie Informatique - Départernent de Chimie-Biochimie, Liban , Kazpard, V Conseil National de la Recherche Scientifique - Commission Libanaise de I Energie Atomique, Liban , Saad, Z Conseil National de la Recherche Scientifique - Commission Libanaise de I Energie Atomique, Liban
Title Of Article :
Influence des ligqnds phosphates sur le mécanisme de déstabilisation de particules colloidales de silice par le chlorure ferrique
Abstract :
In this study, colloidal silica model was aggregated by ferric chloride in presence of increased phosphate concentrations. Coagulation flocculation was realized by using a mixing reactor of lL. Destabilization mechanisms were studied by coupling the jar-test experiments with Atomic Absorption Spectroscopy analysis, Zeta Potential, transmission Electron Microscope and Laser Diffraction. Increased concentration of phosphate in the colloidal suspensions was found to be followed by an increase of the optimal coagulant concentration (OCC) and an increase in settled volume. Results ofAAS revealed that OCC is reached after a complete removal of phosphate from supernatant. Hence, hydrolyzed Iron III species are complexed preferably with phosphate ligands. Size distribution of aggregates indicated that phosphate in suspensions enhances the formation of aggregates with greater size. Beyond a critical concentration of phosphate, aggregate size decreases in parallel with the settled volume
NaturalLanguageKeyword :
coagulation , chlorure ferrique , silice colloidale , ligands phosphates
JournalTitle :
Lebanese Science Journal
