Abstract
The aim of this study is to evaluate the sorption of Ni(II) by gyttja from industrial wastewater. The kinetics and thermodynamics of the sorption process were studied. The effects of contact time, pH, adsorbent dosage and temperature were investigated on the sorption capacity of gyttja. Elovich, intra-particle diffusion and the pseudo second-order reaction kinetic models were evaluated to designate the sorption mechanism. The best conformity kinetic model was described as the pseudo second order. The values of ΔG°, ΔS° and ΔH° were 9.9541-11.4356, -0.0159 and 15.7527 Jmol-1K-1, respectively. Thermodynamic analysis demonstrated that Ni(II) sorption is an exothermic physical sorption process with the ΔH° value of -0.0159 kJmol-1, non-spontaneous and randomness due to the positive value of ΔG° and ΔH°. Moreover, the activation energy was detected as 33.789 kJmol-1. This study strongly indicated that gyttja is an alternative adsorbent for sorption of Ni(II) from industrial wastewater.
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