A control strategy to optimize the keggin formation in concentrated intercalating solution of Al and Al/Fe by catalyzed hydrolysis

Abstract

Natural Organic Matter (NOM) concentration has signicantly increased in
the past few decades in almost all supply sources employed to produce drinkingВ water all around the world [1]. Catalytic Wet Peroxide Oxidation (CWPO)В is an Advanced Oxidation Process (AOP) that has been highlighted thanks toВ its very low cost and simple operation, depleting very eciently the concentrationВ of almost any organic contaminant dissolved in water, including NOMВ [1]. A novel approach is being explored in the "Grupo de Investigacion enВ Materiales Funcionales y Catalisis" (GIMFC) in order to produce interlayeringВ Al/Fe-oligomeric solutions capable of expand natural clays towards PILCs evenВ from pretty more concentrated metal precursors, based on the self-hydrolyzing
dissolution of elemental aluminium in [Al(H2O6)]3+ and [Fe(H2O6)]3+ dissolutionsВ [2]. In this work, based on the method developed by GIMFC, we formulatedВ a set of optimal control problems that maximize the formation of KegginВ and minimize the formation of precipitates during the experiment. We use theВ Pontryagin's Principle to analyze the existence of the optimal controls and theВ adjoint dierential equations. Finally, the control problems are solved using theВ Forward-Backward Sweep Method. The results corroborate that the controlledВ addiction of aluminum Al0 increases the formation of Keggin.