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Sorption of cadmium and lead ions on modified groundnut ( Arachis hypogea ) husks
Author(s) -
Okieimen Felix E.,
Okundia Esther U.,
Ogbeifun David E.
Publication year - 1991
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280510110
Subject(s) - sorption , husk , chemistry , diffusion , aqueous solution , ion , cadmium , inorganic chemistry , metal ions in aqueous solution , nuclear chemistry , adsorption , organic chemistry , botany , physics , biology , thermodynamics
The removal of cadmium and lead ions from aqueous solutions by groundnut husks modified by reaction with EDTA (% N = 12.05) was examined by equilibrium sorption studies at 29°C. The maximum metal ion binding capacity of the EDTA‐modified husk determined from the sorption isotherm from solutions of pH 6.8 was found to be 0.36 mmol g −1 and 0.19 mmol g −1 for Cd(II) and Pb(II) ions, respectively. It was found that the rate of sorption was particle‐diffusion controlled, and the particle‐diffusion control rate coefficient was determined to be of the order of 10 −2 min −1 .