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|Title:||Influence of Ficus religiosa leaf powder on bisorption of cobalt|
|Abstract:||The batch-wise biosorption of cobalt by Ficus religiosa (peepul) leaf powder has been carried out. The optimum biosorbent dosage is 60 g/L for an equilibrium agitation time of 90 min. Percentage removal of cobalt is increased from 70.9 to 97.2 (0.96 to 1.45 mg/g) with decrease in acidity in the pH range from 2 to 7. The experimental data are well represented by Freundlich (n=0.42, Kf=0.83 L/g, R2=0.948), Langmuir (RL=0.566, qm= 3.60 mg/g, R2=0.991), Redlich-Peterson(R2=0.98) and Temkin (R2=0.98, bT =784.52) isotherms, indicating favourable biosorption. The biosorption of Co(II) is described by the pseudo-second order rate equation (K=0.418 g/mg-min, R2=0.99) preferably than first order rate equation (R2=0.89). The biosorption is exothermic, irreversible and spontaneous.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.18(5) [September 2011]|
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