1. Sorption of arsenate and dichromate on polymerin, Fe(OH)x–polymerin complex and ferrihydrite
- Author
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F. Sannino, A. De Martino, Massimo Pigna, Antonio Violante, Renato Capasso, Ernesto Mesto, P. Di Leo, Sannino, Filomena, DE MARTINO, Antonio, Pigna, Massimo, Violante, Antonio, P., Di Leo, E., Mesto, and Capasso, Renato
- Subjects
Anions ,Environmental Engineering ,Sorbent ,Polymers ,Health, Toxicology and Mutagenesis ,Inorganic chemistry ,Industrial Waste ,chemistry.chemical_element ,Ferric Compounds ,Redox ,chemistry.chemical_compound ,Ferrihydrite ,Chromium ,Fe(OH)(x)-polymerin complex ,Chromates ,Environmental Chemistry ,Moiety ,Waste Management and Disposal ,Aqueous solution ,Chemistry ,Arsenate ,Polymerin ,Sorption ,Olive oil mill wastewater ,Dihydrogenarsenate ,Pollution ,Dichromate ,Arsenates ,Adsorption ,Oxidation-Reduction ,Water Pollutants, Chemical - Abstract
Dihydrogenarsenate [H(2)AsO(4)(-), As(V)] or dichromate [Cr(2)O(7)(2-), Cr(VI)] at pH=4.0 showed to be sorbed on a Fe(OH)(x)-polymerin complex and ferrihydrite to a greater extent than on polymerin, the organic polymeric fraction of olive oil mill wastewater (OMW). In particular, the maximum amount (x(m)) of arsenate sorbed on Fe(OH)(x)-polymerin complex was similar to that on ferrihydrite (880.26 and 743.02 mmol kg(-1), respectively), and was much greater than that sorbed on polymerin (384.25 mmol kg(-1)). The sorption of dichromate was to a comparable extent on Fe(OH)(x)-polymerin complex and ferrihydrite (205.90 and 254.88 mmol kg(-1), respectively). Cr(III), a less toxic chromium form, mainly, and Cr(V) were indeed the effective forms sorbed on polymerin (200 mmol kg(-1)), as a consequence of the redox reaction of the strongly toxic Cr(VI) with the CH(2)OH groups of the polysaccharide moiety of this bio-sorbent, according to the data deriving from XPS and DRIFT analyses. The potential exploitation of the selected sorbents for the removal of As(V) or Cr(VI) from aqueous effluents is briefly discussed.
- Published
- 2009
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