Lead removal from aqueous solution using Ficus Hispida leaves powder

摘要

The potential of using activated Ficus Hispida L. as a new biosorbent for the removal of lead from aqueous solution was investigated. The isotherms, kinetics of lead biosorption for F. Hispida L. were evaluated. The results indicate that equilibrium was established in about 30 min. The effect of the pH was examined in the range of 2-10. The maximum removal obtained is at pH value 6.1. The dosage and size parameters were also evaluated to get optimum biosorption of lead. The maximum biosorption capacity at 30℃ is 32.42 mg/g. The effect of temperature has been carried out at 30, 35, 40, and 45℃. The data obtained from biosorption isotherms of lead at different temperatures fit to linear form of langmuir biosorption equation followed by Temkin and Freundlich equations. Biosorption kinetics data were modeled using the pseudo-first- and pseudo-second order and Elvoich equation models. The results indicate that the pseudo-second-order model best describes biosorption kinetic data. The thermodynamic parameters such as enthalpy (ΔH), free energy (ΔG), and entropy (ΔS) were calculated. They show that biosorption of lead on F. Hispida L. is an endothermic process more effective at high temperatures. These results show that Ficus Hispida L. is a good biosorbent for heavy metals from aqueous solutions and could be used as a purifier for water and wastewater.