Browsing by Author "Yemane, Gebremedihn"

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    Synthesis and characterization of Iron nano particle using Eucalyptus (Eucalyptus globulus) for the removal of lead from aqueous solution
    (AAU, 2018-12) Yemane, Gebremedihn; Anuradha, Jabasingh (PhD)
    The application of greenly synthesized ironl nano particle for the removal of lead from aqueous solution is what was studied in this thesis research. The FT-IR and X-RD results reveal that a greenly synthesized iron-polyphenol nano particle complex (GInP) with 80nm size was synthesized using eucalyptus leaf extract the specific surface area was found to be 59m By: Yemane G. Page vi 2 /g. The deployment of GInP in the removal of lead was studied after this diminutive GInP had been procreated by reduction of ferric iron in presence of Eucalyptus globulus leaf extract. The lead removal capability of GInP was investigated for lead concentration ranging from 50ppm250ppm. Batch experiments were performed to investigate the influence of lead concentration, contact time, dosage of GInP and pH on the removal process. A maximum lead removal percentage of 96.75 was observed at pH 4 for 100 ppm lead concentration in 45min using 0.8g dosage. Minitab response optimize technic was used to optimize the amount of lead concentration which has shown there was around 86% removal probability at 150 ppm lead concentration. The adsorption kinetics data were well fitted by the pseudo-first-order rate model with high regression coefficient (0.975). The intra particle diffusion of pb (II) on GInP represents the rate-limiting step. The lead removal process was found to be well fitted into the Langimure isotherm model with determination coefficient of 0.965. Desorption was observed to increase with time. The adsorption capacity was decreased with the increase of temperature, and thermodynamic calculations suggested that the adsorption of lead (II) ions onto GInP is an endothermic process. It has been found that GInPs show high selectivity’s and adsorption capacities to removal of Pb 2+ from aqueous solution