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Removal of Hg(II) from an Aqueous Medium by Adsorption onto Natural and Alkyl-Amine Modified Brazilian Bentonite

Published online by Cambridge University Press:  01 January 2024

Denis L. Guerra ,
Emiliano M. Silva ,
Weber Lara  and
Adriano C. Batista
Denis L. Guerra*
Affiliation:
Universidade Federal de Mato Grosso, DRM-UFMT, Mato Grosso, Brazil 78060 900
Emiliano M. Silva
Affiliation:
Universidade Federal de Mato Grosso, DRM-UFMT, Mato Grosso, Brazil 78060 900
Weber Lara
Affiliation:
Universidade Federal de Mato Grosso, DRM-UFMT, Mato Grosso, Brazil 78060 900
Adriano C. Batista
Affiliation:
Universidade Estadual do Norte Fluminense, UENF, Rio de Janeiro, Brazil 28013 602
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Mercury ion removal from waste-waters has been the subject of extensive research. The aim of the present investigation was to report the incorporation of the n-alkylamine molecules onto a bentonite surface and the capacities of these new chelating moieties on this modified bentonite surface for mercury removal from water. Bentonite collected from the Amazon region, Brazil, was used in an intercalation process with polar n-alkylamine molecules of general formula H3C(CH2)n-NH2 (n = 1 to 4) in 1,2-dichloroethane. The natural and modified bentonite samples were characterized by elemental analysis, Xray diffraction, helium picnometry, mercury porosimetry, and 29Si, 27Al, and 13C nuclear magnetic resonance spectroscopy. Because of the increasing size of the molecules attached to the pendant chains, the metal-adsorption capability of the final chelating materials was measured in each case. The adsorption of Hg(II) on natural and modified bentonites was determined under different conditions. The effects of concentration of Hg(II), contact time, and pH were investigated; batch and dynamic adsorption experiments of Hg(II) were conducted on bentonite samples under various conditions. The ability of these materials to remove Hg(II) from aqueous solution was assessed by means of a series of adsorption isotherms at room temperature and pH 4.0. In order to evaluate the bentonite samples as adsorbents in a dynamic system, a glass column was filled with clay samples (1.0 g each) and fed with 1.8 × 10−4 mol dm−3 Hg(II) at pH 4.0. The energetic effects caused by adsorption of metal cations were determined by means of calorimetric titrations. Thermodynamics indicated the existence of favorable conditions for such Hg(II)-nitrogen interactions.

Keywords

AdsorptionBentoniteCalorimetryDynamic Adsorption ProceduresMercury
Type
Article
Information
Clays and Clay Minerals , Volume 59 , Issue 6 , December 2011 , pp. 568 - 580
Copyright
Copyright © Clay Minerals Society 2011

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