Uptake of Cu2+, Cd2+ and Pb2+ on Zn-Al layered double hydroxide intercalated with edta
Hydrotalcite-like compound [Zn2Al(OH)6]2edta·nH2 O(ZnAl-edta) was obtained from the precursor [Zn2Al(OH)6]NO3·nH2O (ZnAl-NO3), by the anion exchange method, with the aim of uptake Cu2+, Cd2+ and Pb2+ from the aqueous solutions by chelating process between edta and metal cations. The amount of Cu2+, Cd2+ and Pb2+ adsorbed was monitorized by atomic absorption technique at different contact time, pH and metal concentrations. The results indicate the very fast adsorption of the metal cations by ZnAl-edta reaching the equilibrium of the uptake reaction in two hours for Cu and Pb and 24 h for Cd. The shape of the adsorption isotherms suggests specific interaction and high host-guest affinity. At pH 5.5 and initial concentration Ci = 10 mM, the amount adsorbed was Cs = 1117, 375 and 871 μmol/g for Cu2+, Cd2+ and Pb2+, respectively.
| Main Authors: | , , , , |
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| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
2006
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| Online Access: | http://hdl.handle.net/10261/61462 |
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