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• W2327662221 endingPage "195" @default.
• W2327662221 startingPage "186" @default.
• W2327662221 abstract "The biosorption potential of different types of carbohydrate biomass is investigated to evaluate their application to purify water contaminated by vanadium in environmentally relevant oxidation states (V IV and V V ). Spectroscopic studies were done by electron paramagnetic resonance (EPR), vanadium nuclear magnetic resonance ( 51 V NMR), circular dichroism (CD), and electronic absorption in the visible range (vis). Both d-galacturonic and d-glucuronic acids are major components of plant cellular wall polysaccharides. The interaction of V IV with the model ligands d-galacturonic and d-glucuronic acids showed that complexation starts at low pH values (pH 3) and that carboxylate and sugar–OH groups, as well as water molecules, are involved in the coordination. At pH > 4.5, coordination promotes the sugar–OH deprotonation and new species form with the ligand chelating the metal ion via oxygen atoms of carboxylate and of adjacent sugar–O − donors. The studies with pectin and citric acid show the ability of both compounds to partially reduce V V to V IV in solution and the EPR parameters suggest coordination of carboxylate, sugar–OH, and water molecules. The interaction of V V with biomass from different sources shows that grapefruit, orange peel, and plane tree fruit are the most suitable candidates for the biosorption of vanadium. Studies with V V and grapefruit (or the grainless stalk of corn) indicate that the reduction takes place at the “surface” of the solid. EPR studies on the interaction of V IV with different carbohydrate biomass show their ability to complex high amounts of V IV . We propose that the biosorption mechanism, when the biomass is in contact with V V species, involves sorption, reduction, and retention at the surface level of V IV coordinated by oxygen donors of the biomass. When the interaction starts with V IV , the main process just involves the uptake of the metal ion at the surface level." @default.
• W2327662221 created "2016-06-24" @default.
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• W2327662221 date "2013-03-01" @default.
• W2327662221 modified "2023-10-16" @default.
• W2327662221 title "Spectroscopic studies of vanadium biosorption on different types of carbohydrate biomass" @default.
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• W2327662221 doi "https://doi.org/10.1139/cjc-2012-0208" @default.
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