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Phytoremediation of synthetic wastewater by adsorption of lead and zinc onto Alpinia galanga Willd

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Author(s): Vanida Chairgulprasert | Aumikansung Japakeya | Haseenah Samaae

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 35;
Issue: 2;
Start page: 227;
Date: 2013;
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Keywords: galangal | heavy metal | adsorption isotherm | adsorption kinetics | phytosorbent

ABSTRACT
Adsorption of Pb(II) and Zn(II) from aqueous solution onto a phytosorbent mixture of galangal (Alpinia galangaWilld) leaves and pseudostem has been investigated in a batch system. Removal efficiency was optimized with respect topH, contact time, initial Pb(II) and Zn(II) concentration and phytosorbent dosage. Galangal exhibited a higher adsorptionefficiency for lead (95.2%) than for zinc (66.9%). Both lead and zinc equilibrium sorption data were better represented by theFreundlich isotherm than the Langmuir isotherm and in each case followed second order kinetics.
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