: Kinetic and Thermodynamics of Biosorption Ni(II) Ions From Electroplating Wastewater onto Sophora japonica Seeds Powder
: Akl M. Awwad
: Volume 1 (2014)
: The removal of Ni(II) ions from aqueous solutions and electroplating wastewater onto Sophora japonica seeds powder has been studied by using batch adsorption technique. The biosorption studies were determined as a function of pH, contact time, initial metal ion concentration, biosorbent dosage and temperature. The kinetic study showed that the biosorption of the Ni(II) ions followed pseudo-second-order kinetic model. Experimental data obtained were analyzed with Langmuir and Freundlich, isotherm models and in each case the Langmuir model appears to have better regression coefficients. Thermodynamic parameters: ΔGo, ΔHo and ΔSo were calculated indicating that the biosorption of Ni(II) ions onto Sophora japonica seeds powder was a spontaneous and endothermic process. The biosorption process was successfully applied to the treatment of an electroplating wastewater sample, where the concentration of nickel and COD were effectively reduced. The results of the study showed that Sophora japonica seeds powder (SjsP) can be efficiently used as a low-cost and ecofriendly alternative for the removal of Ni(II) ions from aqueous solutions and electroplating wastewater.