Abstract
In this study, kinetics of the uptake of Cu 2+ and Cd 2+ by Mg–Al layered double hydroxides (Mg–Al LDHs) intercalated with citrate 3− (C 6H 5O 7 3−), malate 2− (C 4H 4O 5 2−), and tartrate 2− (C 4H 4O 6 2−) in the interlayer were examined. When the Mg–Al LDHs were added to Cu 2+ and Cd 2+ solutions of a constant pH of 5.0, the concentrations of Cu 2+ and Cd 2+ decreased with increasing temperature. The uptake was shown to occur as chelation between the heavy metal ions and the organic acid anions. The uptake rate equation was found to be dependent on the type of chelate formed.
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