Open AccessASSESSMENT OF THE ADSORPTION KINETICS, EQUILIBRIUM AND THERMODYNAMICS FOR THE POTENTIAL REMOVAL OF NI²⁺ FROM AQUEOUS SOLUTION USING WASTE EGGSHELL
Author(s) -
Şükrü Aslan,
Ayben Polat,
Ugur Savas Topcu
Publication year - 2015
Publication title -
journal of environmental engineering and landscape management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.514
H-Index - 28
eISSN - 1822-4199
pISSN - 1648-6897
DOI - 10.3846/16486897.2015.1005015
Subject(s) - sorption , adsorption , aqueous solution , eggshell , thermodynamics , chemistry , langmuir adsorption model , ion , kinetics , langmuir , organic chemistry , geology , physics , paleontology , quantum mechanics
In this study, Ni2+ sorption onto the waste eggshell was investigated under different operational conditions. Results indicated that the eggshell could be successfully used to remove Ni2+ ions from the water. Quick sorption process reached to equilibrium in about 2 hours with maximum sorption at pH 7.0. Based on the experimental data, Langmuir isotherm model with the qm value of 1.845 mg Ni2+/g eggshell was observed. The pseudo-second-order model provided the best correlation coefficient in comparison with other models. The calculated qe values derived from the pseudo-second-order for sorption of Ni2+ ions were very close to the experimental (qexp) values. Such thermodynamic parameters as ΔG°, ΔH°, and ΔS° were determined in order to predict the nature of adsorption. Results indicated that the adsorption of Ni2+ onto the eggshell was endothermically supported by the increasing adsorption of Ni2+ ions with temperature.