TY - JOUR
T1 - Effect of competitive interference on the biosorption of lead(II) by Chlorella vulgaris
AU - El-Naas, M. H.
AU - Al-Rub, F. Abu
AU - Ashour, I.
AU - Al Marzouqi, M.
N1 - Funding Information:
The authors would like to acknowledge the financial support provided by the Research Affairs at the UAE University. They would also like to thank the following individuals for their help with the experimental work: Sami Abdulla, Ali Dwaidar, Hasan Kamal and Ibrahim Magrabi.
PY - 2007/12
Y1 - 2007/12
N2 - Batch experiments were carried out to asses the effect of Cu(II) and Zn(II) on the biosorption of lead(II) ions by non-living Chlorella vulgaris. The uptake of Pb(II) was examined for single, binary and ternary solutions at different initial concentrations and different pH values. The experimental results showed that the uptake increased with increasing pH from 3.0 to an optimum value of 5.0. The biosorption of Pb(II) was found to be adversely affected by the presence of Cu(II) ions, while Zn(II) ions seemed to have negligible effect on the process. The equilibrium data were fitted to four isotherm models: Langmuir, Freundlich, Sips and Dubinin-Radushkevich; the Sips isotherm gave the best fit for the data. Modeling of the controlling mechanisms indicated that both intrinsic kinetics and mass transfer played major roles in controlling the process. A new dimensionless parameter, Ψ, was defined to asses the relative contributions of the two mechanisms to the biosorption of lead(II). Mass transfer seemed to be the dominant mechanism at low initial lead(II) concentrations, while intrinsic kinetics dominates at high concentrations.
AB - Batch experiments were carried out to asses the effect of Cu(II) and Zn(II) on the biosorption of lead(II) ions by non-living Chlorella vulgaris. The uptake of Pb(II) was examined for single, binary and ternary solutions at different initial concentrations and different pH values. The experimental results showed that the uptake increased with increasing pH from 3.0 to an optimum value of 5.0. The biosorption of Pb(II) was found to be adversely affected by the presence of Cu(II) ions, while Zn(II) ions seemed to have negligible effect on the process. The equilibrium data were fitted to four isotherm models: Langmuir, Freundlich, Sips and Dubinin-Radushkevich; the Sips isotherm gave the best fit for the data. Modeling of the controlling mechanisms indicated that both intrinsic kinetics and mass transfer played major roles in controlling the process. A new dimensionless parameter, Ψ, was defined to asses the relative contributions of the two mechanisms to the biosorption of lead(II). Mass transfer seemed to be the dominant mechanism at low initial lead(II) concentrations, while intrinsic kinetics dominates at high concentrations.
KW - Biosorption
KW - Competitive adsorption
KW - Controlling mechanisms
KW - Lead(II)
KW - Modeling
KW - Preferential adsorption
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U2 - 10.1016/j.cep.2006.11.003
DO - 10.1016/j.cep.2006.11.003
M3 - Article
AN - SCOPUS:34948828628
SN - 0255-2701
VL - 46
SP - 1391
EP - 1399
JO - Chemical Engineering and Processing - Process Intensification
JF - Chemical Engineering and Processing - Process Intensification
IS - 12
ER -