Browsing by Author "Adegoke, H.I."
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Item ADSORPTION OF PB(II) BY MODIFIED AND ACTIVATED CARBON PREPARED FROM Deniella oliveri STEM BARK(2016) Adebayo, G.B.; Adegoke, H.I.; Sidiq, F.Deniella oliveri stem bark was modified using citric acid and activated chemically in the Laboratory. The samples were characterized by physico-chemical and spectroscopic methods. The physico-chemical methods used include ash content, point of zero charge, pH, moisture content, bulk density, volatile component and iodine value while the spectroscopic methods used are X-ray fluorescence (XRF) and Scanning Electron microscopy. The prepared adsorbents were employed in adsorption of Pb(II) ion from aqueous solution and influence of some physicochemical parameters on the adsorption process were also investigated. The adsorption data fitted the Langmuir adsorption data better than the Freundlich isotherm with correlation coefficients of 0.988 and the result of kinetics studies revealed that the data followed the pseudo-second order best which implies that the adsorption process is a chemical process. The result of this study revealed that citric acid modified bark stem has a higher adsorption capacity when compared with the activated one.Item Characterization and Thermodynamics of a Natural Mineral Dye-Based Chromium Complex Dye on Cotton Fabric(2019) Adebayo, G.B.; Orimolade, B.O.; Adegoke, H.I.; Saliu, O.D.; Ajetomobi, O.O.Transition metal complex of a bisazo dye derived from p-phenylenediamine extracted from a natural mineral dye and p-nitroaniline was synthesized with the azo dye acting as ligand for the metal complex dye. The ligand, azo dye and the metal complex were characterized using UV-visible spectroscopy, IR spectroscopy and GC-MS. The IR spectroscopy of both the ligand and the complex reveal the presence of azo group (N=N) at 1597 cm-1, N-O at 1384 cm-1 and other Metal-Ligand (M-L) bonds at 418 cm-1. The results were used to establish the type of metal complex formed to be 1:1 (metal: ligand) and possible structure of the complex was proposed. The metal complex dye was applied on cotton fabric and the thermodynamics parameters of the dyeing process were determined. These parameters included the enthalpy change which was -58.94 KJmol-1 and the entropy which was 0.159 KJmol-1. The thermodynamics studies of the dye showed that the dye has high substantivity and fastness that can be useful in dyeing fabric.