Issue 8, 2024
From the journal:

Dalton Transactions

Competitive adsorption mechanisms of Cd(ii), Cu(ii) and Pb(ii) on bioinspired mesoporous silica revealed by complementary adsorption/isothermal titration calorimetry studies†

Cléophée Gourmand, ORCID logo *a   Caroline Bertagnolli, ORCID logo a   Bénédicte Prelot, ORCID logo b   Anne Boos,a   Véronique Hubscher-Bruder ORCID logo a  and  Jérémy Brandel ORCID logo *a  

* Corresponding authors

a Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
E-mail: jbrandel@unistra.fr

b ICGM, Univ Montpellier, ENSCM, CNRS, Montpellier, France

Abstract

This study presents the adsorption properties of a bioinspired grafted mesoporous silica material and the competitive effects between Cd(II) or Cu(II) and Pb(II) during the adsorption process. Glutathione, a natural antioxidant known for its metal binding properties, has been successfully grafted to SBA-15 mesoporous silica and the optimum adsorption parameters were determined. This original and multidisciplinary approach combines classical adsorption studies with thermodynamic investigations to understand the adsorption behavior of Cd(II), Cu(II) and Pb(II) on this material. To this end, isothermal titration calorimetry (ITC) has been used to elucidate the mechanisms of single-metal and two-metal adsorption. The results showed affinity in the order Pb(II) > Cu(II) > Cd(II) in single metal systems. Cd(II) adsorption relied mainly on physical contributions while Cu(II) and Pb(II) adsorption was shown to be chemically driven. Two-metal systems highlighted that Cd(II) and Pb(II) are adsorbed on the same coordination sites, whereas Cu(II) and Pb(II) are adsorbed on different sites. The material showed good selectivity and encouraging results were obtained on real effluents.

Graphical abstract: Competitive adsorption mechanisms of Cd(ii), Cu(ii) and Pb(ii) on bioinspired mesoporous silica revealed by complementary adsorption/isothermal titration calorimetry studies

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Article information

DOI
https://doi.org/10.1039/D3DT03210H
Article type
Paper
Submitted
29 Sep 2023
Accepted
17 Jan 2024
First published
31 Jan 2024
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2024,53, 3690-3701

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Competitive adsorption mechanisms of Cd(II), Cu(II) and Pb(II) on bioinspired mesoporous silica revealed by complementary adsorption/isothermal titration calorimetry studies

C. Gourmand, C. Bertagnolli, B. Prelot, A. Boos, V. Hubscher-Bruder and J. Brandel, Dalton Trans., 2024, 53, 3690 DOI: 10.1039/D3DT03210H

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