Biosorption of chromium(VI) and arsenic(V) onto methylated yeast biomass

概要

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Yeast biomass was methylated in a 0.1 M HCl methyl alcohol solution at room temperature and the methylated yeast (MeYE) was applied to the adsorptive separation of Cr(VI) and As(V) anions from aqueous solutions. At near neutral pH, while Cr(VI) and As(V) anions were scarcely adsorbed onto unmethylated yeast biomass, their adsorbed amounts increased with increasing methylation degree. The amount of Cr(VI) adsorbed onto MeYE was almost constant at pH4 - 6 and decreased with increasing pH above pH 6. The adsorbed amount of As(V) onto MeYE was rather lower than that of Cr(VI) and it had a peak at about pH 7. A metal-binding model was used to describe the adsorption characteristics of Cr(VI) and As(V) onto MeYE. The results showed that MeYE has two different types of adsorption sites. The saturated adsorbed amount of Cr(VI) and As(V) onto MeYE having methylation degree 0.94 was 0.55 mmol g-1.
Elsevierの論文
2005-01-15