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Issue No:5 Vol.4 |
May -2011 |
ISSN: 0974-5645 |
| RESEARCH ARTICLES |
Viewers & PDF |
| 4. Bioremediation of Ni(II) and Cd(II) from aqueous solution. Muhammad B. Ibrahim and Wahab L. O. Jimoh. Indian J.Sci.Technol. Vol.4, Issue 5, pp: 487-491. |
 
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- Abstract
Different kinds of low cost agro based fibres can be used to remove both trace and heavy metals from aqueous
solutions. The removal efficiency of maize (Zea mays) cob, sawdust and coal was investigated in this study for the
bioremediation of nickel and cadmium. Sorption experiments were carried out using batch process and changes in
concentration of the adsorbates were monitored by the use of Shimadzu AA650 double beam atomic absorption/flame
spectrophotometer. Effects of varying adsorbent dose, adsorbate loading concentration, pH and adsorbent surface
area on the percentage removal of the adsorbates were studied. Results revealed that maize cob have higher affinity
for Cd than Ni, while the reverse was the case with sawdust and coal, where Ni was found to have higher percentage
removal than Cd. Thermodynamic parameters such as ΔH and ΔS were calculated from Van’t Hoff plots which
subsequently lead to the computation of ΔG. At 60 mg/L adsorbate concentrations, the adsorption process was found
to be endothermic, spontaneous and feasible. The enthalpy, entropy and Gibbs energy changes for the removal of Ni
onto maize cob were higher than those of Cd and the opposite scenario was observed for sawdust and coal.
- Keywords: Adsorbent, Adsorbate, Percentage removal, maize cob, sawdust, coal
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