Kinetic, Isotherm and Thermodynamic Parameters of Phosphorus Adsorption on Sediments of Retaining Sidi Chahed Dam

Ali Dehbi, Hind Omari, Adil Lammini, Abdelaziz Abdallaoui

Abstract


In this work, the authors studied kinetics, isotherm, and thermodynamic parameters of phosphorus adsorption on sediment samples taken inside the retaining of the Sidi Chahed dam near the upstream side of Oued Malleh. The results showed that the adsorption reaches equilibrium at 6 h of sediments contact with phosphorus solution. The amount of phosphorus adsorbed is important when the pH of the whole is equal to 12.3, while it is lower at pH values lower than 7.7. The results have indicated that the pseudo-second order model is the most appropriate for describing the kinetic data of adsorption, and that of 43.11 kJ.mol−1 value of the activation energy indicates the predominance of the chemical nature of the adsorption. With regard to equilibrium data, Freundlich isotherms are well applicable compared to those of Langmuir. The thermodynamic study has shown that phosphorus adsorption on sediments is endothermic (ΔH0=19.01 kJ mol−1); it increases with increasing temperature. The negative ΔG0 values (−1.05 at T=20 C°; −2.07 at T=35 C°; −2.76 kJ mol−1 at T=45 C°) showed that the phosphorus adsorption process on the sediments of the retaining of Sidi Chahed dam is spontaneous. However, the positive value of ΔS0 (68.47 J.K−1.mol−1) indicates the increase in sediment-solution interface disorder at the time of phosphorus fixation. 


Keywords


Adsorption, Phosphorus, Sidi Chahed dam, Kinetics, Isotherms

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