Author/Authors :
el boujaady, h. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco , el bakri, a. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco , mourabet, m. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco , el rhilassi, a. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco , bennani-ziatni, m. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco , el hamri, r. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco , taitai, a. ibntofail university - faculty of sciences - department of chemistry, team chemistry and valorization of inorganic phosphates, Kenitra, Morocco
Abstract :
The paper reports on the adsorption of Dyes from aqueous solution onto treated and Natural Moroccan Phosphates. Adsorption tests were realized in static mode .The adsorption of both Dyes, Reactive Yellow 4 (RY4) and direct Yellow 28 (DY28), from aqueous solution onto phosphate rocks of Khouribga and Oued-Zem regions was investigated. Phosphate rocks before and after activation was characterized using X-ray powder diffraction XRD, X -ray fluorescence (XRF), point of zero charge (pH PZC) and Infrared absorption spectroscopy FT-IR. The experimental data were analyzed by using three kinetic models: the pseudo first order, pseudo second order and intraparticle diffusion models. The kinetic study shows that equilibrium is quick. The kinetic data were best described by the pseudo second-order model (R2 ≥ 0.9999). The amount of the dye adsorbed increases with the mass of adsorbent. The adsorption process was pHdependent with a high adsorption capacity at pH 4.
Keywords :
Adsorption , Phosphate rocks , Reactive Yellow 4 , Direct Yellow 28 , Equilibrum
