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Type: Artigo de periódico
Title: Sorption kinetics and equilibrium for the removal of nickel ions from aqueous phase on calcined Bofe bentonite clay
Author: Vieira, MGA
Neto, AFA
Gimenes, ML
da Silva, MGC
Abstract: In this paper the kinetics and dynamics of nickel adsorption on calcined Bofe bentonite clay were studied. The clay was characterized through EDX, surface area (BET) and XRD analysis. The influence of parameters (pH, amount of adsorbent, adsorbate concentration and temperature) was investigated. Kinetic models were evaluated in order to identify potential adsorption process mechanisms. The Langmuir and Freundlich models were utilized for the analysis of adsorption equilibrium. Thermodynamic parameters were assessed as a function of the process temperature. The kinetics data were better represented by the second-order model. The process was found to be strongly influenced by the factors studied. The Bofe clay removed nickel with maximum adsorption capacity of 1.91 mg metal/g of clay (20 degrees C; pH 5.3) and that the thermodynamic data indicated that the adsorption reaction is spontaneous and of an exothermal nature. The Langmuir model provided the best fit for sorption isotherms. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Sorption
Bentonite clay
Heavy metal removal
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Hazardous Materials. Elsevier Science Bv, v. 177, n. 41699, n. 362, n. 371, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2009.12.040
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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