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