Computer Science
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60..291a&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 60, Issue 2, p. 291-304.
Computer Science
6
Scientific paper
Effects of phthalic acid and chelidamic acid on sorption of Cu2+ and Ca2+ were examined in goethite (α-FeOOH)/water suspensions. Single-sorbate sorption of Cu2+ and Ca2+ on goethite over a wide range of conditions (pH, I, sorbate/sorbent ratio) was described reasonably well by the Generalized Two Layer Model (GTLM). In the presence of the organic acids, particularly chelidamic acid, sorption of Cu2+ was significantly enhanced at low pH values. Sorption of Cu2+ in Cu2+-phthalic acid and Cu2+-chelidamic acid binary systems was quantitatively reproduced over a wide range of conditions (pH, Cu/organic acid concentration ratio) with the GTLM by using a unique set of Cu2+ -organic acid ternary surface complexes for each binary system. Sorption of Ca2+ remained unaffected in the presence of phthalic acid, but decreased in the presence of chelidamic acid due to the formation of nonsorbing Ca2+-chelidamic acid solution complexes. These effects were predicted reasonably well by the GTLM. Although the exact sorption mechanisms are unconfirmed, available data suggest that enhanced sorption of Cu2+ resulted from sorption of Cu2+-organic acid complexes in a ligand-like manner, i.e., involving oxide surface sites and carboxyl groups of the organic acids not participating in Cu2+ complexation. Results from this work suggest that the reported mineral-humate-cation interactions are consistent with the formation of cation-humate ternary surface complexes.
Ali Muhammad A.
Dzombak David A.
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