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Sorption Mechanism of Metal Ions Uptake from Aqueous Medium by Chemically Modified Red Onion (Allium Cepa) Skin Extract

Author Affiliations

  • 1Department of Pure and Industrial Chemistry, University of Port Harcourt, P.M.B. 5323, Choba, Port Harcourt, Nigeria
  • 2Department of Pure and Industrial Chemistry, University of Port Harcourt, P.M.B. 5323, Choba, Port Harcourt, Nigeria

Res.J.chem.sci., Volume 6, Issue (9), Pages 49-54, September,18 (2016)


The chemical modification of the polyhyd roxylic extract of red onion skin to yield carboxylated- epichlorohydrin red onion skin extract resin (CERR) and its sorption behavior in the uptake of Mn2+, Fe2+ and Pb2+ ions f rom aqueous medium was investigated. Metal ion uptake was evalua ted at different particle sizes ( 63 to 500 m), periods of agitation (2 to 60 mins) and temperatures (29 to 70C) with 50 mg /L metal ion solution. The optimal particle size was foun d to be 150 m, while the percentage exchange for the metal ions w as in sequence (Mn2+ > Fe2+ > Pb2+) which is consistent with their ionic radii. The percentage metal ion uptake increased with time, and reached equilibrium at 86.69 % (Mn2+) fro m 35mins; 77.01 % (Fe2+) and 66.34 % (Pb2+) from 40mins. The per centage metal ion exchange reduced with temperature i ncrease in the range of 29 to 70C, suggesting better performance w ith CERR at 29C. Examination of the mechanism of u ptake of metal ions using CERR was conducted with Dubinin-Radushkevich isotherm model. Computed values of mean free energy are 8.500, 8.181 and 8.248 kJ/mol for Mn2+, Fe2+ and Pb2+ ions respectively, which corresponds to ion exchange as the dominant mechanism.


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