Open AccessAdsorption of Nickel Ions From Aqueaus Solution Using Natural Clay
Author(s) -
Mohammed Jaafar Ali Alatabe,
Ahmed Alaa Hussein
Publication year - 2018
Publication title -
al-nahrain journal for engineering sciences
Language(s) - English
Resource type - Journals
eISSN - 2521-9162
pISSN - 2521-9154
DOI - 10.29194/njes21020223
Subject(s) - adsorption , nickel , enthalpy , aqueous solution , freundlich equation , chemistry , bentonite , inorganic chemistry , exothermic reaction , langmuir , exothermic process , langmuir adsorption model , ion , thermodynamics , chemical engineering , organic chemistry , physics , engineering
The adsorption characteristics of Nickel (II) onto Iraqi Bentonite clay from aqueous solution have been investigated with respect to changes in pH of solution, adsorbent dosage, contact time and temperature of the solution. The maximum removal efficiency of Nickel (II) ions is 96% at pH=6.5 and exposure to 100 g/L adsorbent. For the adsorption of Nickel (II) ions, the Freundlich isotherm model fitted the equilibrium data better than the Langmuir isotherm model. Experimental data are also evaluated in terms of kinetic characteristics of adsorption and it was found that the adsorption process for Ni+2 ions follows well pseudo-second-order kinetics. Thermodynamic functions, the change of free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) of adsorption are also calculated for Nickel (II) ions. The results show that the adsorption of the Nickel (II) ions on Iraqi Bentonite is feasible and exothermic at (20-50) °C.
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