Adsorption of MnO4 − from aqueous solution by Nitraria retusa leaves powder; kinetic, equilibrium and thermodynamic studies

Abstract

Nitraria retusa leaves Powder was used for adsorption of Potassium Permanganate (KMnO4) from aqueous solutions. The most important physical and chemical adsorptive properties were examined by Brunauer-Emmett-Teller surface analyzer, Fourier transforms infrared spectroscopy, scanning electron microscopy and Theydan and Ahmed method. The surface area, pore-volume, average pore width, density and pHZPC of the adsorbent were found to be 57.8 m2g-1, 0.092 cm3g-1, 13.8 Å, 0.808 g/cc and 6.2, respectively. The most important factors impact the adsorption capacity were studied. The adsorbate initial concentration 600 mg/L, temperature 60 °C, pH 1 and contact time 60 min were found to be the optimal experimental conditions. The isotherm and kinetic experimental data were described well by Langmuir isotherm model and pseudo 2nd order kinetic model, respectively. The adsorption capacities of 312.50, 333.33 and 344.83 mg/g were obtained at 30, 50 and 60 °C, in that order. Thermodynamic parameters indicated that the adsorption obtained in this research is an endothermic and spontaneous process.