College of Engineering
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Item Impact assessment of particulate pollution on maternal mortality in Nigeria(Scientific Reports, 2022) Emetere, M. E.; Oladimeji, Temitayo EItem Investigation of Some Gaseous and Trace Metal Emissions With Their Emission Factors From Various Brands of Mosquito Coils Used in Nigeria(Environmental Health Insights Volume 16, 2022) Elehinafe, Francis B; Okedere, Oyetunji B; Oladimeji, Temitayo E; Anabui, Sarah O.Mosquito coils of various brands are frequently burnt in indoor environments to drive away mosquitoes—the vector for malaria parasite in regions where the disease is endemic. Emissions from the coils could be a source of indoor air pollution. In this study, various brands of mosquito coils obtained from retail shops in Lagos, Nigeria were burnt in an environmental test box with a view to characterizing carbon monoxide (CO), nitric oxide (NO), and nitrogen dioxide (NO2) in the gaseous emissions as well as elemental concentrations of the ash. Emission characterization achieved with the RAS1700 bio-gas analyzer while AAS was adopted for elemental analysis of the mosquito coil ashes. The emission factor of CO, NO and NO2 from the coil samples ranged between 0.00138 to 0.26277 μg/m3, 0.0002 to 0.00454 μg/m3, and 0.000074 to 0.00714 μg/m3, respectively. These values were found to be lower than permissible indoor levels recommended by NIOSH. The range of concen trations of Pb, Zn, Cd, Cr, Cu, As, Hg, Fe in the coil ashes from all the brands were 0.02 to 0.04 mg/g, 0.011 to 0.02 mg/g, 0.001 to 0.003 mg/g, 0.004 to 0.008 mg/g, 0.004 to 0.006 mg/g, 0.0001 to 0.0004 mg/g, 0.001 to 0.003 mg/g, and 0.124 to 0.14 mg/g, respectively. Although, the con centrations of the pollutants obtained in this study are within the recommended limits, prolong exposure could trigger chronic disease conditions. Adequate ventilation of indoor environments or utilization of mosquito nets in place of coils could be considered.Item A Review of Corrosion Threat in Marine Industry(Key Engineering Materials, 2025) Odunlami, Olayemi; Fajobi, Muyiwa; Nnaji, Uchenna; Uriah, Abigail; Gawati, Tomisin; Oladimeji, Temitayo E; Adisa, HassanCorrosion poses a significant challenge in the marine industry, leading to the deterioration of equipment and structures, and resulting in substantial costs for its management and control. This comprehensive review focuses on how metal structures in marine environments, such as ships, are affected by corrosion. It explores different forms of corrosion and strategies to prevent it, particularly in the context of marine vessels. The review includes real-world examples of ships, highlights the financial impact of corrosion in the marine sector, and examines the factors contributing to its occurrence. Corrosion prevents a significant issue for marine vessels and related equipment due to the potential damage to the metal they are constructed from. However, there are effective methods to mitigate this problem, such as employing corrosion-inhibiting substances and selecting appropriate materials. The susceptibility of materials to corrosion varies depending on their composition, resulting in either widespread deterioration or localized damages. By thoroughly examining the corrosion challenge within the maritime industry, this review provides insights into managing and mitigating its effects more efficiently.Item From origin to oversight: properties, impacts and management of heavy metals(Discover Applied Sciences, 2025) Oladimeji, Temitayo E; Oyedemi, Melody O; Odunfa, Moradeyo K; Agboola, Oluranti; Adeoye, John B; Oke, Michael A.; Akindele, Olubukola O.Heavy metals, derived from both natural processes (e.g., rock weathering) and anthropogenic activities (e.g., industrial emissions, agricultural runoff), pose significant environmental and health risks due to their persistence and bioaccumulation in ecosystems. This review emphasizes the need for an in-depth examination of heavy metals, their sources, properties, toxicity, and management. The document also evaluates regulatory frameworks aimed at managing heavy metal contamination and highlights the need for innovative detection and regulation. It underscores the importance of future research and policy advancements to strengthen remediation efforts, safeguard public health, and promote sustainable environmental practiceItem Production of activated carbon from sawdust and its efficiency in the treatment of sewage water(Materials Science Forum, 2025) Oladimeji, Temitayo E; Olaniyan, Ifeoluwa F.; Emetere, Moses E.; Adeoye, John B.; Odunlami, Olayemi, A.; Abatan, Olubunmi G.The use of activated carbon for wastewater treatment has been established based on sustainability and cost. This study delves into the intricate process of producing activated carbon from cow and goat bones and explores the efficiency of this material in removing contaminants from distillery wastewater. The samples were carbonized at 700°C in a muffle furnace, then crushed in a mortar after cooling. The crushed samples were activated using 0.4M phosphoric acid for 24 hours and washed with distilled water, and finally oven dried. The elemental and microstructural was carried on the prepared activated carbon (AC) samples using X-ray Fluorescence (XRF) and Scanning Electron Microscopy (SEM). The heavy metals in the treated water were tested using Atomic Absorption Spectroscopy (AAS). The AC was used to treat waste water and factors on which adsorption depend, such as contact time (35 minutes and 60 minutes), adsorbent dosage (2.5g and 5g), and initial contaminant concentration (100% and 50%) were varied for each activated carbon sample (cow bone AC, goat bone AC, and a mixture of equal ratios of both). It was reported that activated carbon prepared from animal bones is rich in calcium. Also, chemical activation with phosphoric acid led to an increase in the external surface area of the particles with irregular cavities and pores. AC prepared from the mixture of cow and goat bones was most effective for distillery wastewater purification.