Kinetics and thermodynamics of heavy metal ions sequestration onto novel Nauclea diderrichii seed biomass

► Nauclea diderrichii seed biomass as a new biosorbent. ► Biosorption of Cadmium and Mercury ions. ► Kinetics and thermodynamics of biosorption. ► Biosorption feasible, spontaneous and endothermic. This study reports the sequestration of Cd(II) and Hg(II) using a new biosorbent, Nauclea diderrichii...

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Bibliographic Details
Published in:Bioresource technology 2012-08, Vol.118, p.576-579
Main Authors: Omorogie, Martins O., Babalola, Jonathan O., Unuabonah, Emmanuel I., Gong, Jian Ru
Format: Article
Language:English
Subjects:
Adsorption
Biomass
Biosorption
Chemical Phenomena
Differential Thermal Analysis
Endothermic reactions
Film diffusion
Heavy metals
Hydrogen-Ion Concentration
Ions
Kinetics
Mathematical analysis
Mathematical models
Metals, Heavy - isolation & purification
Microscopy, Electron, Scanning
Models, Biological
Nauclea diderrichii seed biosorbent
Rubiaceae - metabolism
Seeds
Seeds - metabolism
Solutions
Thermodynamic models
Thermodynamics
Thermogravimetry
Time Factors
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Summary:► Nauclea diderrichii seed biomass as a new biosorbent. ► Biosorption of Cadmium and Mercury ions. ► Kinetics and thermodynamics of biosorption. ► Biosorption feasible, spontaneous and endothermic. 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 333K, the highest amount of metal biosorbed, qe, for Cd(II) and Hg(II) obtained were 6.30 and 6.15mg/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 4.39mg/gmin 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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2012.04.053