Abstract
The polysaccharidic moieties of three biosorbents (Douglas fir and argan tree barks and argan endocarp) were selectively oxidized, and the subsequent modified materials were tested for their ability to bind Pb(II) or Cd(II) from aqueous solutions. Chemical modifications consisted in two selective oxidations, alone or in combination, of the following groups: primary alcohols with NaOBr catalyzed by (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl, and vicinal diols with periodate/chlorite. The sodium chlorite oxidation step induced biosorbent degradation that led to a significant decrease of mass yield. Modified materials, characterized by FT-IR spectroscopy and measurement of surface acidity, were investigated for their adsorption capabilities of Cd(II) and Pb(II). Results were compared to the capabilities of crude materials using the Langmuir adsorption model in terms of affinity (b) and maximum binding capacity (q max). Ion exchange properties were found better for lead than for cadmium before and after chemical modifications. Compared to crude barks, the best results were obtained for Douglas fir barks whose oxidation resulted in significant enhancements of q max up to × 10 in the case of lead.
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The authors gratefully acknowledge Dr. M. Guilloton for his help in the manuscript editing.
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Hachem, K., Astier, C., Chaleix, V. et al. Optimization of Lead and Cadmium Binding by Oxidation of Biosorbent Polysaccharidic Moieties. Water Air Soil Pollut 223, 3877–3885 (2012). https://doi.org/10.1007/s11270-012-1156-y
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DOI: https://doi.org/10.1007/s11270-012-1156-y