Inderscience Publishers

Biosorption of Cu(II) and Zn(II) ions from aqueous solution by water hyacinth (Eichhornia crassipes)

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The biosorption of Cu(II) and Zn(II) ions from aqueous solution by raw water hyacinth (RWH) and acid treated water hyacinth (TWH) was studied as a function of time, biosorbent dosage and pH. The kinetic results obeyed well the pseudo second–order model. Maximum biosorption capacities for RWH and TWH were measured as 0.49, 6.56 mg/g for Cu(II) and 2.66, 10.71 mg/g for Zn(II), respectively. FT–IR analysis indicated that carboxyl groups in water hyacinth may be involved in the mechanism of Cu(II) and Zn(II) adsorption.

Keywords: biosorption, kinetics, water hyacinth, isotherm, heavy metal removal, heavy metals, copper, zinc, aqueous solutions, Eichhornia crassipes

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