Thiol groups controls on arsenite binding by organic matter: new experimental and modeling evidence

Journal of Colloid and Interface Science
Charlotte CatrouilletGérard Gruau

Abstract

Although it has been suggested that several mechanisms can describe the direct binding of As(III) to organic matter (OM), more recently, the thiol functional group of humic acid (HA) was shown to be an important potential binding site for As(III). Isotherm experiments on As(III) sorption to HAs, that have either been grafted with thiol or not, were thus conducted to investigate the preferential As(III) binding sites. There was a low level of binding of As(III) to HA, which was strongly dependent on the abundance of the thiols. Experimental datasets were used to develop a new model (the modified PHREEQC-Model VI), which defines HA as a group of discrete carboxylic, phenolic and thiol sites. Protonation/deprotonation constants were determined for each group of sites (pKA=4.28±0.03; ΔpKA=2.13±0.10; pKB=7.11±0.26; ΔpKB=3.52±0.49; pKS=5.82±0.052; ΔpKS=6.12±0.12 for the carboxylic, phenolic and thiols sites, respectively) from HAs that were either grafted with thiol or not. The pKS value corresponds to that of single thiol-containing organic ligands. Two binding models were tested: the Mono model, which considered that As(III) is bound to the HA thiol site as monodentate complexes, and the Tri model, which considered that As(III) is ...Continue Reading

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Citations

Mar 5, 2016·Journal of Colloid and Interface Science·Charlotte CatrouilletGérard Gruau
Jul 17, 2016·Water Research·Maria K UllrichBritta Planer-Friedrich
Mar 27, 2018·Environmental Science and Pollution Research International·Junko HaraMing Zhang
May 25, 2020·Journal of Environmental Sciences (China)·Loïc A MartinMarc F Benedetti
Jun 1, 2018·Environmental Science & Technology·Johannes BesoldBritta Planer-Friedrich
Aug 8, 2019·Environmental Science & Technology·Maria P AstaRizlan Bernier-Latmani
Aug 23, 2019·Environmental Science & Technology·Johannes BesoldBritta Planer-Friedrich

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