Browsing by Author "Uzoije, Atulegwu Patrick"

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    Analysis of thermodynamics, kinetics and equilibrium Isotherm on Fe3+/Fe2+ adsorption onto palm kernel shell activated carbon (PKSAC): A low-cost adsorbent
    (SCIENCEDOMAIN international, 2014-01-15) Uzoije, Atulegwu Patrick; Uche, Cosmas Chinedu; Ashiegbu, Darlington
    Adsorption of Fe3+/Fe2+ from a polluted shallow well water onto a palm kernel shell activated carbon (PKSAC) has been studied. Batch experiment was adopted to study the Removal efficiency of Fe3+/Fe2+ on varying contact time, temperature, adsorbent loading and concentrations. Equilibrium isotherm and kinetic were also studied. Removal efficiency progressed with contact time till the peak adsorption time of 100 minutes when the efficiency remained at equilibrium. Also, removal efficiency got to equilibrium at the peak values of 80ºC, 4.8g and 12.5mg/l for temperature, adsorbent loading and concentration variations respectively. The adsorption isotherm models fitted the isotherm data got at 25ºC, 40ºC and 80ºC in this order; Langmuir > Temkin>Freunlich. The dimensionless separation factor of 0.012, 0.017 and 0.015 for 25ºC, 40ºC and 80ºC respectively confirmed favorable adsorption of Fe3+/Fe2+ on the PKSAC adsorbent. Langmuir adsorption capacity increased from 203.9mg Fe3+/Fe2+/g to 389.3 mg Fe3+/Fe2+/g when the temperature increased from 25ºC to 40ºC but decreased to 308.1 mg Fe3+/Fe2+/g at temperature of 80ºC. The kinetic models described the kinetic study data got at 25ºC, 40ºC and 80ºC as follows; power-function>second-order>Elovick>intra-diffusion>first-order kinetics. Mass transfer through liquid film diffusion controlled the adsorption of Fe3+/Fe2+ onto PKSAC. Negative values of the Thermodynamic parameters (Δ􀀂􀀃 , Δ􀀅􀀃 and Δ􀀆􀀃) got at various temperature values showed favorability of adsorption of Fe3+/Fe2+ onto PKSAC.nIt is therefore concluded that PKSAC removed Fe3+/Fe2+ from aqueous solution.
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    Oil and grease removal from vegetable oil polluted wastewater; advanced oxidation process approach (Fenton Process )
    (Elixir International Journal, 2015) Uzoije, Atulegwu Patrick; Kamalu, Clifford. I. O.; Uzoigwe, Luke
    Oil and grease removal process, through the use of fenton oxidation reaction on an oil polluted wastewater from a vegetable oil plant has been studied. The study was designed to assess the effectiveness of fenton oxidation reaction process in eliminating oil and grease contaminant in the wastewater. The raw wastewater was subjected to analysis through standard methods to determine BOD, Oil and grease, phenol, salinity and sodium batch oxidation process was adopted to remove the oil and grease in which four input parameters ; ph, Fe2+, temperature and hydrogen peroxide(H2O2) were considered. Four runs of experiment were performed where each parameter was varied while the other three remained constant. In each run, oil and grease removal was determined at ten minutes interval for 60 minutes through analysis. The results showed that the highest oil and grease removal efficiencies of 96.28% 98.74%, 99.02 and 93.03%were achieved at the optimum conditions of ph=3, fe2+=3.2 g/l, temp=450C and H2O2=4.5moles respectively and the oil and grease removal was progressive with time until at the point of inflection at 50 minutes where the removal appeared steady. Oil and grease removal efficiency was highly sensitive to the operating conditions. At excess values of the operating conditions, that is, at values beyond the optimum values, the rate of formation of the hydroxyl radical (OH•) became sluggish, impairing removal process. This also explained why the removal efficiency progressed to the plateau at the optimum condition values, and then declined as the values of the operating conditions increased.