Abstract
The prepared oxidized porous carbon (PC-KF) was used as an adsorbent for the uptake of nickel-metal ion from the aqueous solution. The optimum conditions for the removal of nickel were at 8.0 pH, 0.5 ppm (500.0 mu g/L) conc., 5.0min contact time, 0.25 g/L adsorbent dose, 15.0 degrees C temperature with 99.59% removal of nickel. Adsorption isotherms of Langmuir, Freundlich and Temkin were used to analyze the results. The results of these models indicated the multilayers layer adsorption on the heterogeneous surface. Thermodynamic parameters i.e. Delta G degrees, Delta H degrees and Delta S degrees were also calculated. The values of Delta G degrees were in the range of -6275.90 to -6169.10 J/mol while the values of Delta H degrees and Delta S degrees were -45.32 J/mol and 18.80 J/mol.K, respectively; indicating adsorption as spontaneous and exothermic. The adsorption process followed pseudo-second-order kinetics. The developed adsorbent for the removal of Ni(II) is effective and highly efficient. The developed method is effective for the removal of Ni (II) in real wastewater. Therefore, this method may be used for the removal of Ni(II) in wastewater. (C) 2020 Elsevier B.V. All rights reserved.