Equilibrium study of single and binary adsorption of lead andmercury on bentonite-alginate composite: Experiments and application of two theoretical approaches.

Sellaoui, Lotfi, Soetaredjo, Felycia Edi, Ismadji, Suryadi, Benguerba, Yacine, Datto, Guilherme L., Petriciolet, Adrian Bonilla, Rodrigues, Alirio E., Lamine, Abdelmottaleb Ben and Erto, Allessandro (2018) Equilibrium study of single and binary adsorption of lead andmercury on bentonite-alginate composite: Experiments and application of two theoretical approaches. Journal of Molecular Liquids, 253 (10). pp. 160-168. ISSN 0167-7322

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Abstract

The adsorption of Pb(II) and Hg(II) ions on bentonite-alginate composite (BAC) is investigated in both singlecompound and binary systems, at three different temperatures. For a better interpretation and comparison, all the adsorption equilibrium isotherms are recorded under identical conditions. A simple examination of all adsorption equilibrium isotherms shows that the bentonite-alginate composite ismore effective for Pb (II) adsorption than for Hg (II) and the adsorption capacity is reduced in binary system, reflecting a competitive effect between the Pb (II) and Hg (II). To explain the single and binary processes and the corresponding mechanisms, Hill and competitive Hill models are applied. The adsorption geometry can be determined at different temperatures by an estimation of the number of ions captured per BAC adsorbent site. Based on these models, it is shown that the affinity sequence in all adsorption systems is: Pb (II) - Hg (II). This behavior can be explained and corroborated by an energetic analysis deduced from these models. Finally, in order to deepen the interpretation of single-compound and binary adsorption, the conductor-like screening model (COSMO-RS) was tested and applied to calculate the total interaction energies between heavy metals and BAC adsorbent. The evaluation of energies deduced from COSMO-RS model indicated that the electrostatic misfit interaction energy may play the main role in the heavy metals ions adsorption in tested systems.

Item Type:	Article
Uncontrolled Keywords:	Single and competitive adsorption Heavy metals Bentonite-alginate composite Mercury Lead
Subjects:	Engineering > Chemical Engineering
Divisions:	Journal Publication
Depositing User:	F.X. Hadi
Date Deposited:	27 Aug 2018 04:43
Last Modified:	10 Sep 2018 03:04
URI:	http://repository.ukwms.ac.id/id/eprint/16110

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