Complexes of humic acid with cationic surfactants support the supramolecular view of extracted humic matter
Abdul Amir Chaaban A B , Bruno Lartiges
A G , Eliane El Hayek A B F , Veronique Kazpard B , Celia Plisson-Chastang C , Patricia Vicendo D and Celine Caillet E
+ Author Affiliations
- Author Affiliations
A University of Toulouse III (Paul Sabatier), Géosciences Environnement Toulouse (UMR CNRS-UPS-IRD), 14 Av. E Belin, 31400 Toulouse, France.
B Lebanese University, Faculty of Sciences, Platform for Research and Analysis in Environmental Science, EDST, Campus Hadath, Beirut, Lebanon.
C University of Toulouse III (Paul Sabatier), Laboratoire de Biologie Moléculaire Eucaryote, Centre de Biologie Intégrative, 31400 Toulouse, France.
D University of Toulouse III (Paul Sabatier), Laboratoire des Interactions Moléculaires et Réactivités Chimiques et Photochimiques (UMR CNRS-UPS 5623), 31400 Toulouse, France.
E Université de Lorraine, CNRS, LIEC, F-54000 Nancy, France.
F Present address: Department of Pharmaceutical Sciences, MSC09 5360, University of New Mexico, College of Pharmacy, Albuquerque, NM 87131, USA.
G Corresponding author. Email: bruno.lartiges@get.omp.eu
Environmental Chemistry 18(4) 156-167 https://doi.org/10.1071/EN21031
Submitted: 15 March 2021 Accepted: 21 June 2021 Published: 19 July 2021
Environmental context. The molecular organisation of humic substances is key to understanding various natural and engineered processes, such as metal speciation and bioavailability. Two main models have been proposed: polymeric organisation and supramolecular organisation. A physicochemical approach, based on the interaction of humic acid with increasing amounts of cationic surfactants, leads to a sequence of molecular structures that provides support to the supramolecular view of humic organisation.
Abstract. The structural organisation of extracted humic matter, polymeric or supramolecular, has been a long-standing controversial issue. In this paper, we show that the interaction between a reference humic material, the Suwannee River Humic Acid (SRHA), and a homologous series of cationic surfactants (n-alkyl trimethyl ammonium chloride) provides key insights to resolve the controversy. By combining measurements of turbidity, electrophoretic mobility, surface tension and cryogenic transmission electron microscopy, we show that: (i) the binding of cationic surfactant to the anionic humic acid is initially triggered by electrostatic interactions; (ii) the contrasting evolution of turbidity–surfactant concentration curves implies that the surfactant alkyl chain interacts with the hydrophobic moieties of humic matter from very low concentrations of surfactant; (iii) a drastic restructuring of humic matter occurs on surfactant binding, which brings out supplementary anionic humic sites; (iv) in the presence of C12 cationic surfactant, SRHA spontaneously forms stable nanoscale unilamellar vesicles, which, in addition to the high surface activity of complexes, could be of interest in the remediation of oil-contaminated environments; (v) the sequence of molecular structures obtained from SRHA with increasing amounts of C12-cationic surfactant – humic-rich vesicles, aggregates, surfactant-rich vesicles – bears striking similarities with the phase behaviour of aqueous mixtures of anionic and cationic surfactants, thus supporting the supramolecular view of humic structure.
Keywords: Suwannee River Humic Acid, cationic surfactant, DTAC, CTAC, supramolecular organisation, cryo-transmission electron microscopy, vesicle.
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