Kinetics and Thermodynamics of Heavy Metal Ions Sequestration onto Novel Nauclea diderrichii Seed Biomass
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Date
2012-08-01
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Elsevier
Abstract
This study reports the sequestration of Cd(II) and Hg(II) using a new biosorbent, Nauclea
diderrichii seed biomass. Experimental data obtained were fitted into kinetic and thermodynamic
models. Experimental data fitted best into pseudo-second order kinetic model among others.
Results obtained kinetically revealed that the biosorption of Cd(II) and Hg(II) using N.diderrichii
seed biosorbent increased with increase in temperature. At the highest temperature, which was
333 K, the highest amount of metal biosorbed, qe, for Cd(II) and Hg(II) obtained were 6.30 and
6.15 mg/g respectively. The biosorption of Cd(II) was kinetically faster than that of Hg(II), the
highest initial biosorption rates for Cd(II) and Hg(II) were 56.19 and 4.39 mg/g min respectively.
Thermodynamic parameters obtained by Erying equation from this study revealed that the
biosorption process was spontaneous, feasible, endothermic with a decrease in the degree of
chaos in the biosorption system.
Description
The authors acknowledge the support of the Academy of
Sciences for the Developing World and the Chinese Academy of
Sciences (TWAS-CAS) for providing fellowship to Martins O.
Omorogie at the National Center for Nanoscience and Technology,
Beijing, China where this research was carried out. This work was
also supported in part by the National Basic Research Program of
China (973 Program No. 2011CB933401) and the National Natural
Science Foundation of China (21005023). Prof. Jian R. Gong
gratefully acknowledges the support of the K.C. Wong Education
Foundation, Hong Kong.
Keywords
Nauclea diderrichii seed biosorbent, Biosorption, Kinetics, Thermodynamics, Film diffusion
Citation
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