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Heavy metals speciation of soils around automobile mechanic workshops in Oshogbo metropolis were carried out in order to access the effects of indiscriminate disposal of used oil and scraps on the soil environment. Soil samples were... more
Heavy metals speciation of soils around automobile mechanic workshops in Oshogbo metropolis were carried out in order to access the effects of indiscriminate disposal of used oil and scraps on the soil environment. Soil samples were collected at two different depths of 0–15 cm and 15–30 cm from four different automobile workshops. The air–dried samples were pulverized and subjected to four–stage sequential extraction procedure for the determination of six heavy metals in the sample. The speciation results at 0–15 cm soil depth indicated significant amount of Cd and Zn were associated with the exchangeable and bound to carbonate fraction. Cu and Pb were prevalently held in the Fe–Mn oxide fraction. At 15–30 cm soil depth, predominate form of Cu, Pb and Zn existed in the Fe–Mn oxide fraction, and significant amount of Cd was associated with organic matter fraction. Cr and Ni were prevalently held in the residual fraction at both depths. The study concluded that the soils at the four a...
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The study focused on Nigeria's polyurethane (PU) production process as a test case. Though it is currently insignificant when viewed from a global perspective, PU production in Nigeria is not eco‐friendly. Traditionally, PU is... more
The study focused on Nigeria's polyurethane (PU) production process as a test case. Though it is currently insignificant when viewed from a global perspective, PU production in Nigeria is not eco‐friendly. Traditionally, PU is produced by reacting petro‐based polyol with a poly‐isocyanate, which is made from amines and phosgene and are currently imported into the country. These two materials are detrimental to the human health and environment, indicating that Nigeria's PU industries need to re‐examine their production inputs for environmental compliance. The objective of this study is to review the PU industry for nontoxic reagents that could be sourced locally vis‐à‐vis overcoming sustainable development (greening the economy) challenges in Nigeria. Non‐isocyanate polyurethane (NIPU) is preferred to petro‐polyurethane because, in comparison, NIPU has improved thermal and chemical resistance, porosity and water absorption, and is less toxic. Engaging local resources to produ...
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Hospital wastewaters are one of the most contaminating wastewaters and need to be paid more attention due to containing infectious agents. In this study, which had been conducted in a period of one year, 7 public hospitals were selected... more
Hospital wastewaters are one of the most contaminating wastewaters and need to be paid more attention due to containing infectious agents. In this study, which had been conducted in a period of one year, 7 public hospitals were selected out of 12 public hospitals in Hormozgan Province of Iran. For studying quality of wastewater in hospitals, both influent and effluent wastewaters of treatment plant, if any, were sampled once in each season and totally 30 mixed samples were obtained. In order to determine the quality of hospital wastewaters in all samples, parameters such as pH, BOD5, COD, TSS and temperature were measured. Results of investigation on annual water consumption indicated that average water consumption in hospitals of the province was 194m3/d., considering water-to-wastewater conversion ratio of 0.8 and green yard ratio of 0.3. Wastewater production rate had been estimated to be 47m3/d and 0.362 m3/d.bed. Results indicated that in 7 hospitals of Hormozgan province, mean...
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We report the synthesis of various shaped silver nanoparticles mediated by ZnCl2 salt. It has been demonstrated that the salt, PVP/AgNO3 mole ratio, and the type of polyol (EG, DEG,and GL) significantly determined twinning probability,... more
We report the synthesis of various shaped silver nanoparticles mediated by ZnCl2 salt. It has been demonstrated that the salt, PVP/AgNO3 mole ratio, and the type of polyol (EG, DEG,and GL) significantly determined twinning probability, which is an index of silver seed growth origin. High twining probability arising from low PVP/Ag+ ratio and 50 mole% salt favours 1D grown nanowires and nanorods, whereas low twining amidst high mole% salt (150) in DEG offered 2D grown nanoflakes and nanosheets. Other shaped silver nanoparticles have been found. Accidentally, we arrived at a core-shell heterostructure of Ag-ZnO nanocomposite with Ag core enrichment when mole% of the salt was made up to 300. Growth kinetic of nanosphere obtained was monitored, and effect of salt mediation was found crucial. Structural evolution of shaped Ag nanoparticles and nanocomposites have been monitored using XRD, SEM, EDX, TEM, and UV/vis.