Kinetics, Equilibrium, and Thermodynamics Studies of the Biosorption of Lead(II) and Chromium(III) by Basella alba L
نویسندگان
چکیده
The ability of a fast growing plant (Basella alba L.) to remove lead(II) and chromium(III) ions from aqueous solutions has been studied in a batch system. The effects of various parameters such as pH, biomass dosage, agitation time; and initial metal concentration were examined and have been found to have direct influence on the uptake of the metals by the biosorbent. Time-dependence experiments for the metal ions showed that optimum binding to the Basella alba L. occurred within 30 min. and 7 min. for Pb and Cr, respectively. Metal uptake decreased with increase in biosorbent dose for the two metals. The kinetic data fitted well to the pseudo-second-order model. The values of the rate constant, k2, for both metals were found to be 0.5644g mgmin and 22.303 gmgmin for Pb and Cr, respectively. Equilibrium data followed both Langmuir and Freundlich models. Using the thermodynamic equilibrium coefficients obtained at different temperatures, the thermodynamic parameters of each biosorption process were evaluated. The biosorption of Pb was found to be endothermic with ∆H of 18.96 kJmol while that of Cr was exothermic with ∆H of -4.137 kJmol. The changes in entropy (∆S) of biosorption values obtained were 0.079 and -0.013 kJKmol for Pb and Cr, respectively. The values of ∆G obtained for the two metals were -4.574 and 0.280 kJmol, respectively. The values indicate the feasibility and spontaneous nature of the biosorption process. (
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