Bioadsorption of Pb(II) onto Anethum graveolens from Contaminated Wastewater: Equilibrium and Kinetic Studies


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.

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A. Hashem and K. El-Khiraigy, "Bioadsorption of Pb(II) onto Anethum graveolens from Contaminated Wastewater: Equilibrium and Kinetic Studies," Journal of Environmental Protection, Vol. 4 No. 1, 2013, pp. 108-119. doi: 10.4236/jep.2013.41012.

Conflicts of Interest

The authors declare no conflicts of interest.


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