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Réactivité des associations organo-minérales dans une lagune d'eaux de mine : fixation du plomb par des matières biologiques

Abstract : The solid-water interface plays an important role in the regulation of metal concentration in natural water. This contact between aqueous and solid phases affects the mobility and behaviour of metals in soil, sediments and waters. The studied site is a mining water collection wetland which water solutions and solid sediments were chemically characterised in order to understand sorption/desorption processes of lacustrine sediment cations. Test materials representative of the lacustrine sediments (oxyhydroxides, clays, biomass) were used to study sorption mechanisms in laboratory experiments and under natural conditions. The surfaces of these materials have different affinities and selectivities for the cations present in solution. A new acido-basic and metallic potentiometric titration method was used to analyse sorption mechanisms of lead onto Rhlzopus arrhizus biomasses. Affinities of binding sites of Pb2+ were established with respect to the different functional groups (carboxylic and phosphate). The affinity depends on the association coefficient with proton or counter ion and on the spatial distribution of the surface sites promoting the formation of mono or bidendate complexes. Chemical bonds and binding sites were validated using microscopic and spectroscopic techniques (IR, METEDX) and ion exchanging polymer models. Biosorption is not considered globally but as the result of sUccessive adsorption on various binding sites, in which precipitation occurs rapidly when lead concentration increases (>10[exponent -5]M). The development of thermodynamic methods improves the interpretation of sorption isotherms in order to evaluate the effects of thermodynamic parameters on sorption capacity and sorption mechanisms.
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Submitted on : Thursday, March 29, 2018 - 10:41:48 AM
Last modification on : Monday, December 14, 2020 - 3:35:59 PM

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  • HAL Id : tel-01746643, version 1



Ghinwa Naja. Réactivité des associations organo-minérales dans une lagune d'eaux de mine : fixation du plomb par des matières biologiques. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10070⟩. ⟨tel-01746643⟩



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