Browsing by Author "Orimolade, B.O."
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Item Adsorption of Cd(II) And Fe(II) from Aqueous Solution Using Adsorbents Prepared from Waste Polythene Sachets(2016) Adebayo, G.B.; Orimolade, B.O.; Saliu, O.D.; Abu, T.O.; Abdulsalam, K.The adsorption of Fe(II) and Cd(II) ions from aqueous solution was studied using adsorbents prepared from waste polythene sachets. The effect of initial ion concentration, contact time, pH, adsorbent dose and temperature on the removal of Fe(II) and Cd(II) ions wasexamined. The optimum concentration was found to be 40 ppm for Fe(II) and 50 ppm for Cd(II) ions. The equilibrium data fit the Langmuir isotherm better than the Freundlich and Temkinisotherms. The negative values of the Gibbs free energy (ΔG) revealed that the adsorption process is feasible and spontaneous. The adsorption of Cd(II) ion was found to be spontaneous at 323 K on sulfuric acid activated samples but not spontaneous at all on carbonized samples. The adsorption data fit well into the pseudo-second-order kinetic model and the experimental quantities of Cd(II) and Fe(II) adsorbed are relatively close to the calculated quantities adsorbed. The prepared adsorbents therefore offer an alternative for the removal of the metal ions from contaminated water.Item An Assessment of Heavy Metals Contents in the Soil around a Cement Factory in Ewekoro, Nigeria Using Pollution Indices(2017) Okoro, H.K.; Orimolade, B.O.; Adebayo, G.B.; Akande, B.A.; Ximba, B.J; Ngila, J.NThis study investigated the concentrations of heavy metals in soils around the WAPCO cement factory in Ewekoro in southwestern Nigeria. A total of 27 soil samples were collected from three locations (Ewekoro, Papalanto, and Itori) around the cement factory. Atomic absorption spectroscopy was used to determine the concentrations of metals. The results revealed that the mean values of the metals content in the three soil samples were in the order: Fe > Zn >Mn> Cr > Cu >Pb. The concentrations of Pb present in Ewekoro and Papalanto samples were 0.391 and 0.243 mg/kg, respectively while Pb was not found in the control area(Itori). The concentrations of the heavy metals in the soil samples were found to decrease as the distances of the communities from the cement factory increased. Our study revealed that study area soils were affected by dust emissions from the cement factory as shown in the very low concentrations of heavy metal contents of the control study area, Itori.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.Item ECOTOXICOLOGICAL AND RISK ASSESSMENT OF GLYPHOSATE ON THE ACTIVITY OF DUCKWEED(2016-04-08) Adebayo, G.B.; Orimolade, B.O.; Okoro, H.K.; Orija, D.Ecotoxicological effect and risk assessment of a pesticide residue (glyphosate) was studied. The effect of different concentrations (0.2-0.8ppm) of glyphosate on the plant (Duckweed) was used for the study by collecting and culturing duckweed for a period of one week and thereafter exposing the duckweed to different concentrations of glyphosate for 8 days. The pigment content and biomass were monitored to assess the effects of the glyphosate on the plant. The results revealed that all the concentrations show adverse effect on the plant pigment content as well as on the biomass productivity as the days progressed and the concentration increases. This study has shown that the residue of glyphosate could be dangerous to the ecosystem at concentration as low as 0.2ppm which is actually the allowable level of glyphosate in plant leaf.Item Ecotoxicological and Risk Assessment of Hydroquinone Cream Residue on Duckweed Plants(2019-01) Adebayo, G.B.; Orimolade, B.O.; Okoro, H.K.; Banwo, M.A.Residues from personal care products have been reportedly found in soils and are harmful to plants and animals. This research studied the ecotoxicology effects and risk assessment of hydroquinone cream residue on duckweed plant. The effects of different concentrations (50, 100, 150 and 250 ppm) on the duckweed (Lemna minor) were used for the study. The duckweed was collected from the Dam area of University of Ilorin, Ilorin, Nigeria and cultured for a period of one week before using it for the study. The plants were exposed to the different concentrations of hydroquinone cream for a period of 8 days. The results revealed that all the concentration shows adverse effect on the plant pigment content as well as biomass with the effect increasing as the concentration increases. The study has shown that the residue of hydroquinone cream could be dangerous to the ecosystem at concentration as low as 50 ppm which is well below the amount of the residue expected in the environment.Item Removal of p-Nitrophenol from Aqueous Solution Using Synthesized Silica-Magnetite Composite(2017) Adekola, F.A.; Orimolade, B.O.; Adebayo, G.B.Silica-magnetite composite was synthesized as model adsorbent for the removal of p-nitrophenol (p-NP), a problematic toxicant present in effluents from pharmaceutical and allied industries. The adsorption behavior was studied by batch method. Prepared adsorbent was fully characterized using Fourier Transform Infra-red spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and X-Ray Fluorescence. The optimum conditions of adsorption were determined by investigating the effect of initial p-NP concentration, contact time, adsorbent dose, pH value of aqueous solution and temperature. Adsorption equilibrium time was found to be 60 min. The optimum initial concentration of p-NP was 70 mg/L while the optimum temperature and pH were 30 0C and 2 respectively. The equilibrium adsorption experimental data were fitted best the Langmuir isotherm. The pseudo-second order kinetic model described the adsorption kinetics more effectively. The thermodynamic studies revealed that the adsorption process is spontaneous and feasible. The experimental results have revealed the potential of synthesized material for the removal of p-nitrophenol from aqueous solution.