Calcium bentonite from Orasu Nou deposit (Romania) has been used in order to prepare Al-pillared clays, which are microporous materials with special properties. The pillaring process consists in the following steps: bentonite purification, ionic exchange of bentonite, preparation of pillaring agent, intercalation of the exchanged bentonite with pillaring agent and calcination. During calcination process the polyhydroxocation is transformed into an oxide which is strong fixed into the clay interlayer. The pillared clays present a rigid structure, a high termic stability given by the oxido-metallic pillars formed after calcinations. This paper presents the application of the kn experiment design procedure for simulation and optimization of the Al(III)-pillaring process. There were performed 9 experiments according to the experimental design procedure. The input variables were calcination temperature (x1) and calcination duration (x2) and the output variable was the basal distance (Y). The material with the optimum calcination parameters will be chosen in the aim of its using in liquid effluents depollution.

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