Department of Chemical Engineering.

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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, Hassan
Corrosion 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.
A review on the sustainable energy generation from the pyrolysis of coconut biomass
(Scientific African (Elsevier), 2021) Azeta Osarhiemhen; Ayeni A. O.; Agboola O.; Elehinafe Francis B.
he negative impacts of the extraction and exploration of fossil fuel on the environment and its depletion that has led to environmental degradation have encouraged researchers, stakeholders, and the government to explore alternative and renewable energy sources such as lignocellulosic biomass. Biomass pyrolysis has proven to be a viable energy conversion process over the last decade due to its low carbon footprint on the environment. Pyrolytic products that are bio-char, bio-oil, and bio-gas have several applications and contribute to our society’s industrial, commercial, and economic growth. This paper reviews the different types of pyrolytic processes using coconut biomass as a feedstock while focusing on the biomass properties that make it useful for pyrolysis and the factors affecting the process.
A Simplified Design for Biodiesel Production
(International Conference on Engineering for Sustainable World (IOP Publishing), 2021) Ayoola A. A.; Alagbe E. E.; Agboola O.; Ayeni O. A.; Adeyemi G. A.; Nnabuko D.; Makinwa
Advanced techniques for the capturing and separation of CO2 – A review
(Results in Engineering, 2022) Odunlami, O. A.; Vershima, D. A.; Oladimeji, T. E.; Nkongho, S.; Ogunlade, S. K.; Fakinle, B. S.
The review was carried out to compare the efficiencies of the advanced and modern techniques for the capturing of CO2 and those (technologies) which are already in place. The ever-growing concern for the need to reduce and eliminate the effects of CO2 in the atmosphere has led to major areas of CO2 capture, over the years, to be explored and applied. Several techniques such as adsorption, absorption, cryogenic separation technique, membrane and a combination of two or more of these techniques were explored to determine which was most effective in the carbon capture process. A combination of the principles of these techniques were explored to determine how they can be applied in the advanced techniques of the CO2 capturing and storage processes, within this new age. Absorption stands out as the most commonly used technique for carbon capture. However, it is energy intensive and depending on the solvent used (i.e., ethanol), can be corrosive to the vessel it is utilized in. The review explored advanced methods for carbon dioxide capture such as the use of ionic liquids, zeolites, molten carbonate fuel cell and integration with several other components that enhance, not only their efficiencies, but also other physio-chemical properties that encourage its advancement. These were explored in the course of writing this review paper. From the review, it was discovered that Ionic liquids, integrated with membranes, enhance selectivity towards efficient CO2 capture. Zeolites occur naturally or are produced synthetically. They comprise of metal ions, are porous and made of certain ligands. They apply the principle of adsorption to remove CO2 and store. Molten carbonate fuel cells operate at high temperatures (usually at 600 ◦C) and have CO2 removal efficiencies of up to 60%. The review paper was, successfully, able to identify some of the major advanced technologies in the process of Carbon capture and the principles, efficiencies and costeffectiveness were described, appropriately. From the literature, molten carbonate fuel cells were the best of the three advanced methods, with high efficiency and operations at high (and varying) ranges of temperature
Air quality investigation over Moundou Chad
(International Conference on Energy and Sustainable Environment, 2019) Emetere, M. E.; Oladimeji, Temitayo E
The air quality over Moundou-Chad was examined using satellite dataset. Fifteen years aerosol optical depth (AOD) was obtained from the Multi-angle Imaging Spectro Radiometer (MISR). The AOD dataset is statisticaly stable for further prediction. The highest AOD mean was observed in 2008. The standard deviation, average deviation and coefficient of variation all agrees that the AOD dataset is reliable. It is shown that the aerosol loading over Moundou is high and the size of the aerosol is very tiny to deposit in the human lungs.
Application of mass transfer in the pulp and paper Industry􀀀 overview, processing, challenges, and prospects
(Results in Engineering (Elsevier), 2023) Odunlami Olayemi A.; Amoo Temiloluwa E.; Adisa Hassan A.; Elehinafe Francis B.; Oladimeji Temitayo E.
This study reviews the mass transfer with a focus on the challenges, benefits, processing and prospects in the pulp and paper industry with a scope limited to Kraft pulping which is the dominant pulping process worldwide. The mass transfer usually occurs in various processes that deal with reactions, separation, and heat transfer. All these aforementioned processes occur in the production of pulp and paper from their raw materials. The application of mass transfer to these processes is of great importance in setting target yields, and specifications and improving efficiency. The major processes where mass transfer principles are applied are drying, chemical washing, pulp digestion and pulp bleaching respectively. Understanding the requirements and targets of each of these processes in combination with the mass transfer principles helps in the development of models and design of equipment that operate based on the developed models in meeting the required targets. Studies have indicated that mass and energy balances cannot be done independently in meeting the required targets and equipment design. The drying and stripping of lignocellulosic components of the feed-in paper manufacture constitute a large part of the challenges faced by the industry. Drying techniques have been considered to be inefficient, and lignocellulosic by-products are known to contain toxic components. Green chemistry production processes and newer drying techniques were indicated as possible solutions. It is expected that researchers and investors would find this article useful.
CONTROL OF FOSSIL FUEL GAS OPERATING CONDITIONS ON THE PERFORMANCE OF CARBON DIOXIDE CAPTURE PROCESS
(2021) Letsholo I.; Moropeng M. L.; Mavhungu A.; Agboola O.; Fayomi O. S. I.; Moropeng R. C.
CORROSION INHIBITION BEHAVIOUR OF CALF THYMUS GLAND DNA ON MILD STEEL IN SULPHAMIC ACID
(Covenant University Ota, 2025-04) Ekere Isaac E.; Covenant University Thesis
Inorganic acid cleaners based on sulphamic acid are frequently employed in industrial equipment cleaning, descaling and acidizing. This application of sulphamic acid in industrial cleaning is not entirely without its drawback as the cleaning action usually leads to dissolution and loss of base metals. The addition of corrosion inhibitors is one of the industrial practices employed to minimize equipment corrosion damage. The purpose of this work was to assess the viability of deoxyribonucleic acid (DNA), extracted from calf thymus gland, as an inhibitor for mild steel corrosion in sulphamic acid medium, and in comparison, with salmon Fish DNA and INDION 5489, a commercial inhibitor. The inhibition process was investigated using weight loss, potentiodynamic polarisation, SEM/EDX and FTIR measurements. Response surface method (RSM) and artificial neural network (ANN) were employed to determine the optimum corrosion inhibition conditions. The weight loss measurements obtained the highest inhibition efficiency of 82.71% at 303 K and immersion time of 6 h by addition of 2.5 mg/L of calf thymus DNA, CTGDNA. The corrosion rate was also observed to decrease with an increase in inhibitor concentration. Potentiodynamic polarisation curves showed a shift in Ecorr < 85 mV an indication that CTGDNA is a mixed inhibitor, suppressing both cathodic and anodic reactions. An RSM generated polynomial model obtained an optimum efficiency of 72% at 303 K, 5.5 mg/L after 2.12 h immersion. Estimation by ANN, with minimal errors, and a higher R2 of 0.983 in comparison to 0.925 for RSM were close to the experimental inhibition efficiency. CTGDNA adsorption on mild steel modelled the Langmuir isotherm with a linear regression coefficient of 0.99. The increase in the activation energy from 37.54 kJ/mol to 52.5 kJ/mol after 2 h immersion; with a similar trend for 4 and 6 h demonstrated that addition of CTGDNA favoured physioisorption. The small and negative value of entropy was an indication that the adsorption of CTGDNA was spontaneous. FTIR confirmed the presence of protective film formed by CTGDNA inhibitor on the mild steel surface at various concentration. SEM images showed reduction in the degradation of mild steel surface in the uninhibited solution after addition of CTGDNA. The comparative studies obtained a weight loss of 0.0036, 0.0047, 0.0072 and 0.0086 mg in 10% sulphamic acid in the presence of CTGDNA inhibitor, salmon fish DNA, conventional cleaning solution and blank solution of 10% sulphamic acid without an inhibitor, respectively. This confirmed that the CTGDNA inhibitor enhanced the 10% sulphamic acid cleaning solution as a suitable and viable cleaning agent for mild steel in comparison with INDION 5489.
Corrosion mitigating techniques and the mechanisms: Comment
(International Conference on Engineering for Sustainable World (IOP Publishing), 2021) Ayodeji A. I.; Fayomi O.S.I.; Babaremu K. O.; Abioye P. O.; Agboola O.; Daniyan A. A.
A lasting solution is required to curb the corrosion attack because of the very destructive effect it has on engineering materials. Corrosion is a material degrading phenomenon that reduces the significant properties of metallic materials, making them less useful. This paper has been able to highlight the very suitable methods or techniques that help to mitigate the effect of corrosion on metals and other helpful engineering materials. Some of these methods are electrodeposition and protective coatings like organic coatings, inorganic coatings, and metallic coatings.
Data on the corrosion Inhibition Property of Rosemary on High Carbon Steel in dilute sulphuric acid, citric acid and sodium chloride solution
(Chemical Data Collections (Chemical Data Collections ), 2021) Odunlami, Olayemi; Loto, R. T.; Fajobi, Michael Ayobami; Olomukoro, O. T.; Akande, I. G.; Oke, M. A.; Oladimeji, Temitayo E
The data of electrochemical analysis of Rosmarinus officinalis (RO) essential oil effect on high carbon steel (HCS) in three different corrosive environment of sodium chloride, sul- phuric acid and citric acid solution was achieved via weight loss method. Results revealed that Rosmarinus officinalis (RO) organic compound performed excellent well on high carbon steel samples with the optimum inhibition value occurring in NaCl solution with 97.87% after 504 h. The corrosion rate values were significantly high at 0 ml RO organic com- pound for all the three (3) corrosive environments as the time of immersion moves down to 504 h. It was clearly observed that time of immersion and concentrations of RO are the main determinant factor for the excellent adsorption performance of RO organic compound within the range of 504 h. Also, Rosmarinus officinalis (RO) organic compound retarded the severe corrosion rate of high carbon steel samples in other corrosive solutions with aver- age range inhibition values between 40 and 78% after 504 h.
Data on the effect of Ibruprofen drug derivative on 430T1 stainless steel in acid solutions
(International Conference on Engineering for Sustainable World (IOP Publishing), 2021) Sanni O.; Fayomi O. S. I.; Popoola A. P. I.; Agboola O.
Demulsification of a Nigerian crude emulsion using ethoxylated-resoles and their xylene modified blends
(International Conference on Recent Trends in Applied Research, 2021) Efeovbokhan, Vincent E.; Chibuzor, Chukwuebuka C.; Babalola, Rasheed; Abatan, Olubunmi G; Oladimeji, Temitayo E
Demulsification is a method used to reduce or disrupt the water - crude oil emulsion system without uttering the initial composition of the crude oil. This process is done by the introduction of chemicals called demulsifiers, which break the emulsion into aqueous and organic phases. In this study, the demulsifier formulated was the base-catalyzed phenol formaldehyde resin known as the resoles, with the ratios of phenol to formaldehyde, varied between 1.0:1.2 and 1.0:2.0. The different samples of resoles where then ethoxylated to make them more hydrophilic using different weights (10, 15 & 20 g) of polyethylene glycol (PEG). Screening of the ethoxylated demulsifiers was done using the established bottle test procedure, at 70 °C, the concentration of 50 ppm, and 20 minutes of residence or separation time, in order to select the most effective demulsifier, based on the amount of water removed from the emulsion. The best chemical-demulsifier produced was the ethoxylated resole, which was then blended with xylene at varying percentages (0, 20, 40, 50, and 80 % weight/weight) and was further screened, using the bottle test method. From the analysis, it was obtained that the most effective ethoxylate-xylene demulsifier blend was sample DR3, and made of formaldehyde to phenol ratio of 1.8:1, 20 g of PEG 400 blended with 20 % xylene. The demulsifier gave a water separation efficiency of 85.7 %, compared with the commercial demulsifier, which yielded 72.7 %. The result indicates the practical significance of solvent modified demulsifiers for separating crude oil emulsions in the petroleum industries.
Emissions of CO and SO2 from solvent extraction treatment of used lubricant
(4th International Conference on Science and Sustainable Development, 2021) Oladimeji, Temitayo E.; Sonibare, Jacob A.; Omoleye, James A.; Emetere, Moses, E.; Odunlami, Olayemi, A.
Emissions fromused lubricant could have adverse effect on man and its environment due to the presence of degraded additives and contaminants. Different treatment methodshas been developed with few check on its pollution aspect. This study investigated the emissions of two major criteria pollutants - carbon monoxide (CO) and sulphur dioxide (SO2) from the solvent extraction treatment of used lubricant. CO was found to be the highest emitting pollutant with mean emission concentration of 85.85 mg/m3 which has exceeded the set NAQS standard while SO2 falls within the standard limit. Therefore,there is a great need to give attention to the control of CO emissions around the treatment plant. However, CO emission can be controlled by employing a CO converter to convert the poisonous gas to a less poisonous gas or substituting the existing process in solvent extraction with a more environmentally friendly one.
Empirical assessment of ammonia and urea concentrations in wastewater from a pharmaceutical plant: A case study
(International Conference on Energy and Sustainable Environment (IOP Conf. Series), 2021) Sanni S E.; Odigure J. O.; Agboola O.; Emetere M. E.; Okoro E. E.; Audu C.
In several ways, urea is one of the most prominent sources of fixed nitrogen due to its relative abundance in waste water treatment plants. In this study, the wastewater effluent from X-Chemical Industries was considered for hazard analysis in order to ascertain the water quality and impact at the outfall effluent of company X relative to environmental standards. The study period is for December, 2013 – February 2014. Based on the results, it was observed that at the company’s sluice gate, the desorber (primary treatment unit) did not perform optimally. Also, the variation of the parameters measured i.e. urea concentration, pH and ammonia concentrations exceeded the standards established by the World Bank, International Finance Corporation (IFC) and the National Environmental Standards and Regulations Enforcement Agency (NESREA), i.e. against the specified standard of 100 ppm, higher concentrations include December 3, 9, 11, 12, 19, 20, 21, 24, 25, 27, 28 and 29 with corresponding urea concentrations of 1457, 1970.4, 122.7, 163.2, 150.3, 171.4, 148.76, 270.78, 178, 123, 101.33 and 250.43 ppm respectively, whereas that of ammonia is higher than 5 ppm on December 3, 21, 24, 25, 26, 27, 28 and 29 with corresponding concentrations of 8.4, 9.69, 8.13, 9.45, 12.5, 6.98, 22.95 and 9.95 respectively, whereas, it was lowest on other days. It was also observed that the treated waste water advancing the creek (jetty) close to the plant, will have environmental consequences on marine lives such as marine micro-flora as well as fishes.
ENHANCEMENT OF FINGERPRINT TEMPLATE PROTECTION AND PRIVACY PRESERVATION USING FULLY HOMOMORPHIC ENCRYPTION
(Covenant University Ota, 2025-03) ITUH NICOL IGNATIUS; Covenant University Dissertation
The transition from conventional or token-based passwords to biometric technologies because of the advantageous characteristics of biometrics traits is increasing daily. Nowadays, biometric technologies are utilised in applications such as border control, e-banking, e-health, etc. Biometric traits comprise biological traits (iris, face, fingerprint, etc) and behavioural traits (keystroke, signature, voice, etc). In contrast to other biometric traits, the fingerprint is the most utilised in most applications. Despite the advantages, biometric technologies have their drawbacks. The biometric data of an individual is unique since no two people have the same biometrics, and compromising this biometric data could have devastating results. This issue was addressed using the implementation of the Paillier cryptosystem, a partial homomorphic encryption scheme which only involves addition operations. This implementation suffers drawbacks when faced with complex computations such as the multiplication of two ciphertexts and faces ciphertext noise growth due to these complex computations. Thus, a need for fully homomorphic encryption which handles complex computation and manages noise growth through several techniques. This research work is aimed at enhancing fingerprint template protection and privacy preservation using fully homomorphic encryption. The proposed system was developed utilising the Brakerski/Fan-Vercauteren fully homomorphic encryption scheme implemented using the OpenFHE-Python library. The system was evaluated using the Neurotechnology CrossMatch dataset according to performance metrics including Accuracy, Genuine Acceptance Rate (GAR) and Equal Error Rate (EER). Results indicated that the Neurotechnology CrossMatch dataset achieved an accuracy of 84%, GAR of 84%, and EER of 16%. Therefore, the implementation of fully homomorphic encryption in biometrics achieves adequate accuracy despite both the encryption and decryption processes, thereby safeguarding the template, and preserving the user’s privacy.
Fabrication and Potential Applications of Nanoporous Membranes for Separation Processes
(Environmental Nanotechnology Volume 5 (Springer, Cham), 2021-07-05) Agboola Oluranti; Popoola Patricia; Sadiku Rotimi; Sanni Samuel Eshorame; Babatunde Damilola Elizabeth; Ayoola Ayodeji; Abatan Olubunmi Grace
Innovative membrane processes are considered a very important segment of controllable separation processes, such as water treatment, gas separation and organic purification. One of the challenges in membrane technology is the challenge of selecting and fabricating membrane material for excellent selectivity and good permeability for selected particle sizes. The utmost operational challenge perturbing the performance of membrane technology is membrane fouling which occur as a result of insoluble materials covering the membrane surface, leading to a reduction in water quality. Other factors perturbing the performance of membrane technology are energy usage and greenhouse emission. Furthermore, the necessity to react to climate change is another major challenge for membrane technology. An excellent membrane should have high stiffness in order to withstand high pressures applied, large surface area and micro- or nanopore structures for excellent selectivity and good permeability for selected particle sizes. The transport of ions and fluid at molecular level, controlled at the nanometer-scale using membranes provide substantial capacity for high selectivity and high fluxes. The potential applications of nanoporous membranes are strongly subjected to the chemical and physical properties of a membrane material. The effective pores size, porosity, uniformity, thickness, surface chemistry and morphology also have influence on membrane separation performance. We reviewed the fabrication and potential applications of nanoporous membranes for separation processes, operational challenge, energy usage, greenhouse emission and effect of climate change. Thus, the major points, include: (1) fabrication methods of nanoporous membranes for excellent selectivity and good permeability for selected particle sizes, (2) Theoretical modeling and simulations of nanoporous membranes, (3) potential applications of nanoporous membranes, (4) the recent discovery of novel nanoporous membrane structures aimed at overcoming the challenge of fouling, (5) the challenge of energy usage, (6) addressing climate change as a contributing factor to the challenges of water treatment industry and membrane technology.
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 practice
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 practices
Gasific: A Python Tool for Biomass Gasification Process
(Advanced Manufacturing in Biological, Petroleum, and Nanotechnology Processing, 2022-04-04) Oladokun O.; Nyakuma B.; Luing W. S.; Oladimeji E.; Abatan O.; Ayeni A. O.; Agboola O.; Ayoola A. A.; Ojewunmi M. O.; Efeovbokhan V. E.
Biomass gasification and the production of syngas are important in the production of biohydrogen, a green fuel and an energy carrier for the fuel cell. The tool for the prediction of biohydrogen production from any biomass should be readily available to determine the viability of such biomass for gasification. The software implementing a robust gasification model is complex, proprietary, and expensive. In order to solve this problem, we developed Gasific, a software module for simple, free, and accurate biomass gasification product gas prediction. Gasific, implemented biomass gasification, stoichiometric equilibrium models, in Python and runs on a variety of platforms. We discussed the application of Gasific on biomass wastes, namely, Imperata cylindrica; the simulation shows good performance in predicting the gas composition product of gasification. The developed software and the code can be modified and applied to other scientific models and transform the models into software applications.
Industrial- and automotive-used lubricating oils recycling cum acidic sludge treatment
(Springer, 2019) Oladimeji, Temitayo E; Oguntuashe, Kehinde M.; Emetere, Moses E.; Efeovbokhan, Vincent E.; Odunlami, Olayemi A.; Obanla, Oyinlola R.
Increased rise of industries and car usage in Nigeria and urban development is exponentially on the increase giving rise to multiple waste generation. Evaluation of the different recycling processes showed that acid-clay process has the highest environmental risk as well as the lowest cost; hence, this work added a treatment method for the slurry produced after treatment with acid-clay method, thereby reducing the environmental concern caused by acid and acid sludge formed in the process. The acid ratio was varied between 0 and 20% and adsorbent ratio between 15 and 25%. Automotive-used lubricating oil and industrial-used lubricating oil were treated using two different samples, acid and adsorbent. An increase in acid concentration showed a significant difference over the properties of oil such as density, viscosity, flash point, and other physiochemical properties nevertheless increasing the amount of acid over the optimum point made on significant change. Varying of adsorbent ratio showed little significant effect to density and flash point, while yield and viscosity were unaffected. Optimum point being at 10% acid and 25% adsorbent gave optimal result. All metal contaminants are substantially removed; total base number was improved, while increase in flash point suggested the method effectiveness. Treatment of used industrial oil was found to be easier to re-refine due to less contamination.