Isotherm,kinetic and thermodynamic analysis of adsorption of CU(II), Nİ (II) and CO(II) with karacadağ scoria

In this study, to remove copper(II), Ni(II) and Co(II) ions from aqueous solutions low-cost Karacadağ scoria were used. BR1 was characterized by XRD, XRF, FT-IR BET and SEM methods. It was observed that the large and small pore volumes of BR1 amounted to half of the total volume. The equilibrium data obtained are were applied Langmuir, Freundlich, Temkin and Dubinin Radushkevich (D-R) adsorption models, and the kinetic data were also applied to pseudo-first order model, pseudo-second order model (Ho and McKay model), Weber-Morris and Elovich models. As a result of regression analyzes; Langmuir Model for equilibrium studies and pseudo-second model for kinetic studies were found to be the most suitable models. Maximum adsorption capacity of Cu(II), Ni(II) and Co(II) ions were determined as 1,83, 2,23 and 3,09 mgg-1 ; 0,73, 1,31 and 1,80 mgg-1 0,56, 0,93 and 1,36 mgg-1 at 298,313 and 328 K for copper, 298,313 and 323 K respectively. Thermodynamic parameters such as free energy, entalpy and entropy for adsorption Cu(II), Ni(II) and Co(II) ions onto BR1 are determined as -13,37 -17,12 and -20,86 ; -11,55 -15,07 and -17,41; -10,36 -14,72 ve -17,63 kJmol-1 for free energy (∆G), 61,04 58,3 ve 76,36 kJmol-1 for entalpy, 0,2497 0,2344 ve 0,2910 kJmol-1K-1 for entropy. The positive value of ΔH in thermodynamic studies showed that The adsorption event was endothermic, also the negative ΔG values showed that the event occurred spontaneously.