The removal of Cr (III) and Co (II) ions from aqueous solution by two mechanisms using a new sorbent (alumina nanoparticles immobilized zeolite) — Equilibrium, kinetic and thermodynamic studies

摘要: Abstract The removal of Cr (III) and Co (II) from various samples ionic solutions was investigated using several sorbents such as alumina nanoparticles (Al2O3 NPs), NaX zeolite granules a new sorbent: immobilized (ANIZ), in batch mode. effects operating parameters were studied order to optimize the conditions. Results showed that capacity has been significantly improved (Cr (III): 31.76%, (II): 17.2%) after immobilization Al2O3 NPs. Langmuir, Freundlich, Temkin Dubinin–Radushkevich (D–R) equations examined describe isotherm models their constants evaluated. kinetic data analyzed Pseudo first order, second Elovich intraparticle diffusion models. equilibrium excellent correlation for both Langmuir Freundlich second-order model fitted experimental results better than other Thermodynamic analyses suggested reactions spontaneous [− ΔG°, kJ·mol− 1 = 29.37 43.69 (III); 33.54. 41.61 (II)] spontaneity increased with increasing temperature.