TITLE:
Bioadsorption of Pb(II) onto Anethum graveolens from Contaminated Wastewater: Equilibrium and Kinetic Studies
AUTHORS:
Ali Hashem, Khalid El-Khiraigy
KEYWORDS:
Anethum Graveolens Biomass; Bioadsorption; Pb(II) Removal; Adsorption Kinetic
JOURNAL NAME:
Journal of Environmental Protection,
Vol.4 No.1,
January
29,
2013
ABSTRACT:
In the
present study we reported the feasibility of the Anethum graveolens as biosorbent to remove Pb(II) from aqueous
solutions. Anethum graveolens was
characterized by scanning electron microscopy and elemental analysis. The
ability of Anethum graveolens to
adsorb Pb(II) was investigated by using batch adsorption procedure. The effects
such as pH, contact time, adsorbate concentration and biosorbent dosage on the
adsorption capacity were studied. The experimental data were analysed using
various adsorption kinetic models viz., the pseudo-first and second-order
equations, Bangham’s equation, intraparticle diffusion and Elovich models.
Results show that the pseudo-second-order equation provides the best correlation for the
biosorption process. The equilibrium nature of Pb(II) adsorption at 30℃ has been described by the Langmuir, Freundlich,
Temkin and Redlich-Peterson isotherm models. The equilibrium data fit well on
Langmuir isotherm. The monolayer adsorption capacity of Pb(II) onto Anethum graveolens as obtained from
Langmuir isotherm at 30℃ was found to be 303 mg/g. This high adsorption
capacity of Anethum graveolens places
this biosorbent as one of the best adsorbents for removal of Pb(II) from
aqueous effluents.