Use of clinoptilolite for the removal of nickel ions from water: Kinetics and thermodynamics
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Date
2008
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ELSEVIER SCIENCE BV
Access Rights
info:eu-repo/semantics/closedAccess
Abstract
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.
Description
Keywords
clinoptilolite, nickel removal, ion-exchange, reaction kinetics
Journal or Series
JOURNAL OF HAZARDOUS MATERIALS
WoS Q Value
Q1
Scopus Q Value
Q1
Volume
150
Issue
3
