Biomass sorbents for metalloid removal
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- Ansone, L., Klavins, M., Jankevica, M. et al. Adsorption (2014) 20: 275. doi:10.1007/s10450-013-9594-4
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The present work investigates the sorption of metalloids—As(V), Sb(V), and Te(VI)—on Fe-modified biomaterials (Fe-modified peat, shingles, moss, straw, canes, and sand) using batch tests. The said sorption was studied as a function of initial metalloid concentration, pH, and temperature. The highest sorption capacity was observed for Fe-modified peat. Fe-modified moss and Fe-modified shingles can also be used in severely polluted waters. The best sorption conditions are in the pH interval 3–6.5 for As(V) and Sb(V), while pH 3–9 is the most appropriate interval for Te(VI) removal. The impact of temperature on the metalloid sorption capacity of Fe-modified peat was tested at four temperatures: 275, 283, 298, and 313 K, and the sorption capacity increased with increase in temperature for all of the studied metalloids. The calculated thermodynamic parameters suggest that the sorption process is of a spontaneous nature and endothermic.