Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 150, Issue 3, Pages 587-595Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2007.05.008
Keywords
clinoptilolite; nickel removal; ion-exchange; reaction kinetics
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This paper describes the removal of Ni(II) ions from aqueous solutions using clinoptilolite. The effect of clinoptilolite level, contact time, and pH were determined. Different isotherms were also obtained using concentrations of Ni(II) ions ranging from 0.1 to 100 mg L-1. The ion-exchange process follows second-order reaction kinetics and follows the Langmuir isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy, and enthalpy, for the ion-exchange of Ni(II) on clinoptilolite, and revealed that the ion-exchange process was spontaneous and exothermic under natural conditions. The maximum removal efficiency obtained was 93.6% at pH 7 and with a 45 min contact time (for 25 mg L-1 initial concentration and a 15 g L-1 solid-to-liquid ratio). (c) 2007 Elsevier B.V. All rights reserved.
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