Oladayo Adeyi

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Verified

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• Doctor of Philosophy
• Lecturer at Michael Okpara University of Agriculture

Nigeria faces significant environmental and health risks due to rapid Waste Electrical and Electronics Equipment (WEEE) generation, estimated at 500,000 tons annually. This systematic review analyses the situation of WEEE in Nigeria, examining existing policies, regulations, and emerging technologies for sustainable recycling. The review analysis r...

The degradation of atrazine (ATZ) was studied in the presence of β-cyclodextrin (β-CD) under ultraviolet light irradiation. The β-CD was characterized by modern analytical techniques and the different operating parameters of photodegradation were investigated. Experimental results revealed irregular shapes in the structure of β-CD, and the function...

The rapid growth of the Electrical and Electronic Equipment (EEE) industry has led to an increase in Waste Electrical and Electronic Equipment (WEEE) generation in Nigeria. The informal sector plays a significant role in WEEE recycling, but unsustainable practices pose environmental and health risks. Unsustainable EEE recycling practices in Nigeria...

Response surface methodology (RSM) was employed in this study to optimize the epoxidation of Azadirachta indica seed oil (AISO) in the presence of sulfuric acid as a catalyst. The independent variables were (catalyst concentration, time, and temperature) while iodine and oxirane values were the dependent variables. The (analysis of variance) ANOVA...

Application and efficiency of bio-coagulants for petroleum wastewater biocoagulation, flocculation, and sedimentation (bioclarification) are still confined to laboratory proof-of-concept practice. The scale-up process design of bio-clarified water recovery from petroleum wastewater has been a major research lacuna. This paper presents ASPEN Base Ca...

Essential oils in their unadulterated form, can be primarily classified into two fundamental chemical constituents, namely: hydrocarbons, oxygenated and terpenoidal bioactive compounds. The biochemical characteristics of essential oils exhibit significant variations contingent upon the specific extraction methods employed. While traditional techniq...

This study explores the thermodynamic characteristics of convectively dried Cobra 26 F1 tomatoes at various temperatures and after different thermal pre-treatments. Employing Multi-gene Genetic Programming (MGGP), the refined model accurately predicts energy utilization (EU), energy utilization ratio (EUR), exergy loss (ExLoss), and exergy efficien...

The feasibility of recovering bioactive antioxidants from Phyllantus emblica leaves using ethanol -water mixture (0 – 100%) and heat-assisted extraction technology (HAE-T) was investigated in this present study. To this effect, the process parameter of operating temperature (OT: 30 -50 oC), solid -to-liquid ratio (S:L: 1:20 - 1:60 g/mL) and extract...

This present study investigates the heat-assisted extraction (HAE) of bioactive antioxidants from Enantia chlorantha stem bark (ECSB). The effects of process parameters of operating temperature (OT: 35–55 °C), extraction time (ET: 100–200 min) and solid: liquid ratio (S/L: 1:20–1:50 g/mL) are determined on the total polyphenol content (TPC), antiox...

The focus of this research is to identify the best set of factors that influence the heat-reflux recovery of total phenolic content and antioxidant activities under multiple quality characteristics. Parametric Taguchi L9 orthogonal design and grey relational analysis technique were used to investigate the effect of three variables—reflux duration,...

Previous investigations reported evaluation of biological, therapeutic and pharmacological activities of phenolic bioactive extract from Huntaria Umbellate Seed (HUS). However, process modelling and optimization, upscaling as well as techno-economic evaluation of Microwave-Assisted Extraction (MAE) of HUS are seldom documented in the literature. Th...

The requirement for reduction of post-harvest losses increased production, and cost-effectiveness of foods are driving continuous food process investigations. In this study, Response Surface Methodology (RSM) was utilized to understand, model, and optimize the effect of selected process factors on the moisture content (MC) of convectively dried unr...

The requirement for cleaner and healthy environment is a drive for waste recycling programs. In this study, suitable reinforcement for composite production was extracted from Nauclea latifolia herb root waste (NLHRW) through alkalization. Proximate composition and crystallinity of NLHRW and alkalized NLHRW (ANLHRW) were determined using gravimetric...

PurposeDespite a huge pharmacological and medicinal significance of Citrullus Colocynthis fruit (CCF) extract as claimed by previous researchers, the extract production is limited to laboratory endeavour. Therefore, this study is aimed at developing optimal process conditions, scale-up process design with its associated economics for CCF microwave-...

The requirement for easily adoptable technology for fruit preservation in developing countries is paramount. This study investigated the effect of pre-treatment (warm water blanching time—3, 5 and 10 min at 60 °C) and drying temperature (50, 60 and 70 °C) on drying mechanisms of convectively dried Synsepalum dulcificum (miracle berry fruit—MBF) fru...

Enzymes are valuable in many biofuels production processes, and their wide application has generated significant market demand in recent years. To develop lignocellulosic fuels in a biorefinery, high cost and low catalytic efficiency of cellulase are a major obstacle in the industrial use of this enzyme. A techno-economic assessment of cellulase pr...

This work reported the effects of heat-assisted extraction (HAE) temperature (35 – 55 °C), solid: liquid (1:20 - 1:50 g/mL) and time (100 - 200 min) on the total phenolic content (TPC, GAE/g), bioactive extracts yield (EYs, %) and antioxidant activity (AA, AAE/g) of Senna alata leaves (SALs) using the Box-Behnken experimental design. Multi-objectiv...

Context: Nonconventional extraction methods, such as microwave, supercritical fluid, and ultrasonic, are known to be veritable means of producing solvent-free high-quality essential oils. Nonetheless, technical requirements for the utilization of these extraction technologies are often exorbitantly expensive, thereby limiting their utilization. Evi...

In this study, the microwave-assisted processing of Sesamum indicum leaves was intensified to predict the total alkaloid content via Taguchi orthogonal design and neural network model. Under the optimum microwave condition, the maximized alkaloid content was estimated to be 15.40 (mg/g) % using irradiation time (A) of 60 sec, microwave power (B) of...

The diverse adverse effects of waste generated from numerous industrial and local sources have been one of the most significant impediments to environmental sustainability. One of the many waste management technologies explored is the use of biological treatment techniques through the use of bioreactors. Bioreactors with a broad range of applicatio...

This study presented ASPEN Base Case Simulation (BCS) using optimum laboratory experimental data, techno-economic predictive models, and multi-objective optimum profitability scenario of biodiesel production from palm kernel oil. The BCS was developed in ASPEN Batch Process Developer V10 environment. Predictive models for predicting and optimizing...

Colocynthis Vulgaris shrad peel is a lignocellulosic biomass that has been underexploited in recent years to produce value-added fuels and chemicals, however, the introduction of artificial intelligence techniques to model and predict the complex hydrolysis process parameters at a reduced time and cost is of paramount importance. This study compare...

This work investigated the influence of process variables of extraction temperature (35 - 55oC), solid to liquid ratio (1:20 - 1:50 g/mL) and time (100 - 200 min) on the total phenolic content (TPC) and yield (EY) of Carica papaya leaves (CPL) extracts using Box Benken experimental design available in Design Expert software. Bi-objective process op...

The drying characteristics of unblanched (UB), steam blanched (SB) and hot water blanched (WB) Cobra 26 F1 tomatoes were investigated at drying temperature of 40, 50, 60 and 70 °C and constant air velocity of 1.2 m/s in a convective oven. Gaussian process regression (GPR)-based models defined with squared-exponential kernel (GPR-SE), rational quadr...

In this work, we synthesized and economically analyzed a sustainable process of industrial production of microencapsulated anthocyanins powder (MAP) from Hibiscus sabdafiffa L. calyx (HSC) with the assistance of SuperPro Designer software. Open literature data were used in the synthesis of flowsheet and minimum selling price (MSP) of MAP was the on...

Allium sativum extract is one of the medicinal and aromatic products used in pharmaceutical and food industries. The scientific literature bibliography regarding process scale-up simulation and techno-economics of phenolic extract from Allium sativum microwave-assisted extraction is seldom reported. This study presented optimization and techno-econ...

The primary objective of this study is to determine the hot air drying characteristics and nutritional quality of orange‐fleshed sweet potato (OFSP) in a convective dryer. Three temperatures (323.15, 333.15, and 343.15 K) and fan speed levels (0.5, 0.9, and 1.3 m/s) were used. A rehydration study of dried OFSP was also carried out. Modeling and pre...

This aim of this study was to evaluate the effects of pretreatments and temperature on the hot air drying characteristics of hog plum fruits. Hog plum fruits were pretreated with olive oil/K2CO3 or sunflower oil/K2CO3 at 28 °C and olive oil/NaOH cum blanching at 96 °C for 15s, hot water at 96 °C for 15s, and dried in a hot air drier at 50, 60, and...

This work presents an integrated heat-assisted extraction process for the production of crude anthocyanins powder (CAnysP) from Hibiscus sabdariffa calyx using SuperPro Designer. The influence of process scale-up (0.04 -1000L) and variables (temperature, time and ethanol proportion in solvent) were investigated by adopting a circumscribed central c...

The wastewater from paint manufacturing industry contains high quantity of pollutants that are generated from washing equipment, as well as chemical additives. Hence, coagulation–flocculation was applied in the present study to evaluate the performance of some natural coagulant derived from Hibiscus esculentus L,(okra) Detarium microcarpum,(sweet d...

In this work, process simulation, techno-economic study and Neuro-Fuzzy (NF) production rate prediction of colourant extract production from Sorghum (Bicolor) Leaf Shealth (SBLS) were studied. The Base Case Simulation (BCS) material and energy balance, economic and sensitivity analyses were carried out in Aspen Batch Process Developer (ABPD) V10® s...

Convectional algorithms such as least-square and gradient descent for adaptive neuro-fuzzy inference system (ANFIS) prediction of engineering process system is deficient by local optimum trapping problem. Therefore, this study is aimed at developing novel hybrid genetic algorithm (GA)–ANFIS–Box–Behnken (BB) model for Heveabrasiliensis seed oil epox...

Sierrathrissaleonensis (SL) is a low valued fish in Nigeria because of its small size and availability of fleshy alternatives. Therefore, an alternative utilization ofSL is crucial. In this study, SL wasused to produce fish cracker (SLC).The SLC, being an intermediate product was dried to achieve moisture stability. During drying process, the influ...

The hot air drying characteristics of fermented-cooked (FC) cassava chips were investigated at a temperature of 50, 60, and 70�C and the fan speed of 0.5, 0.9, and 1.3 m/s. Proximate compositions, functional characteristics, and moisture diffusion parameters of the FC cassava chips were also studied. Furthermore, the applicability of mathematical (...

This study presents predictive modelling with uncertainty analysis, optimization and techno-economic feasibility of Bio-catalyzed Biodiesel Production from Azidirica Indica Oil (BCBPAIO). Central Composite Design (CCD) predictive model and optimum conditions for BCBPAIO were developed in Design Expert software. The model uncertainty analysis was pe...

Understanding the effect of reinforcement scales on the properties of fibre reinforced composite and establishment of suitable material property predictive model are important for successful composite development. This study investigated the effect of micro and nano scale Momordica augustisepala stem natural fibre (MASNF) on the mechanical properti...

The quality characteristics and stability of phenolic by-products from Cola nitida wastes are critical factors for drug formulation and food nutraceutical applications. In this study, the effect of electromagnetic-based microwave-reflux extraction on the total phenolic content, antioxidant capacity, morphological characteristics, physisorption and...

Nauclea latifolia root (NLR) extract is one of phytochemicals used to treat various ailments in most of developing countries. This investigation focuses on modelling, optimization and computer-aided simulation of phenolic solid-liquid extraction from NLR. The extraction experiments were conducted at extraction temperature (ET: 33.79–76.21 °C), proc...

This study designed, techno-economically analyzed and compared the heat-assisted extraction (HAE)- and ultrasound-assisted extraction (UAE)-technology-based processes (HAE-tBP and UAE-tBP) for the production of crude anthocyanins powder (CAnysP) from Hibiscus sabdariffa calyx (HSC) with the assistance of SuperPro Designer software. Both the base ca...

Studies on modeling and optimization of alkali treatment, investigation of experimental uncertainty and sensitivity analysis of alkali treatment factors of natural fibers are important to effective natural fiber reinforced polymer composite development. In this contribution, response surface methodology (RSM) was employed to investigate and optimiz...

The investigation of the potentials of the acid modified Africa elemi seed, mucuna shell, and oyster shell as an adsorbent for the removal of cadmium ions from aqueous solution using batch adsorption was carried out. The material characterization was carried out using Fourier transform infrared and scanning electron microscopy. The effects of opera...

This study is based on parametric selection and prediction of sweet potatoes starch drying using Regression Tree (RT), Support Vector Machine (SVM) and Neuro-Fuzzy (NF) soft-computing techniques. The drying experiments are conducted at Drying Temperature (DT): 40–60 °C, Drying Time (DTi): 0–780 min, Ambient Temperature (AT): 27.2–30 °C and Relative...

The increase in wastes generated from jackfruit seeds has been largely under-utilized in Malaysia. Due to the high nutritional and medicinal content embedded in the cellulosic structure of jackfruit wastes, a need then arises for their physicochemical elucidations. In this study, the extraction of Artocarpus heterophyllus seed was carefully investi...

The aim of this study was to model and optimize the adsorption of Pb(II) ions from an aqueous solution using Africa elemi seed, mucuna shell and oyster shell modified with orthophosphorous acid used as adsorbents. The influence of operational parameters such as adsorbent dosage, initial pH and contact time was evaluated by response surface methodol...

This study is aimed at modelling and optimization of phenolic compound extraction from Azadirica Indica Leaves (AIL) using Response Surface Methodology (RSM), Adaptive Neuro-Fuzzy Inference System (ANFIS) and Cuckoo Search algorithm (CSA). The extraction experiments were conducted at Extraction Temperature (ET): (33.79-76.21oC), Process Time (PT):...

This study applied Adaptive Neuro-Fuzzy Inference System (ANFIS) to predict the moisture ratio (MR) during the drying process of yam slices (Dioscorea rotundata) in a hot air convective dryer. Also the effective diffusivity, activation energy, and rehydration ratio were calculated. The experiments were carried out at three (3) drying air temperatur...

This work designed, modeled and performed economic analysis of the base case extraction and recovery of catechin mix (CM) from Camellia sinensis leaves (CSL) using deep eutectic solvent (DES) and microwave assisted extraction (MAE) with the assistance of SuperPro Designer software. Techno-economic analysis of three commercial scales of manufacture...

The influence of citric acid concentrations on the physical stability of sunflower oil-in-water emulsions (40 w/w% sunflower oil) stabilized by 7 w/w% bambara groundnut flour (BGNF) was investigated. Oil droplet sizes and emulsion microstructure were measured microscopically. Physical stability was studied using a vertical analyzer, Turbiscan MA 20...

The influence of sodium chloride salt (NaCl) concentrations on the physical stability of sunflower oil (SFO)-in-water emulsions (40 w/w% SFO) stabilized by 7 w/w% bambara groundnut flour (BGNF) was investigated. Oil droplet sizes and emulsion microstructure were measured microscopically. Physical stability was studied using an optical analyzer, Tur...

The influence of vinegar concentrations on the rheological properties of 40% (w/w) sunflower oil-in-water emulsions stabilized with 7% (w/w) gelatinized bambara groundnut flour (BGNF) was investigated. The rheological properties of interest were steady shear, time dependent and viscoelastic characteristics. Rheological characterizations of the emul...

In this paper, Adaptive Neuro-Fuzzy Inference System (ANFIS) was used to model and predict Grewia Polysaccharide Gum (GPG) extraction yield from Grewia mollis (GM) powder/water system. The data for modelling the process behaviour consisted of four inputs (process temperature, GM powder/water ratio, process time and pH) and GPG yield as the output....

The influence of vinegar concentrations on the physical stability of sunflower oil-in-water emulsions (40 w/w% sunflower oil) stabilized by 7 w/w% Bambara Groundnut Flour (BGNF) was investigated. Oil droplet sizes and emulsion microstructure were measured microscopically. Physical stability was studied using a vertical analyzer, Turbiscan MA 2000,...

Soluble dietary fibres (SDFs) [30% (w/w)] from four varieties of Bambara groundnut (BGN), viz. black-eye, brown-eye, brown and red were used to stabilize orange oil beverage emulsions at 6% (w/w) orange oil. Emulsion stability was studied using Turbiscan MA 2000 and in terms of oil-droplet size characterization. The volume-surface mean diameter (d3...

The influence of sodium chloride salt (NaCl) concentrations (0-300mM) on the rheological properties of sunflower oil-in-water emulsions (40 w/w%) stabilized by 7 w/w% gelatinized bambara groundnut flour (BGNF) was investigated. Rheological characterizations of the emulsions were carried out using a shear rate controlled rheometer. Emulsions with an...

The contribution of emulsion main components to the time-dependent rheological properties of oil in water emulsion stabilized by gelatinized bambara groundnut flour (BGNF) was studied. Sunflower oil-in-water emulsions were prepared and stabilized with gelatinized BGNF. Weltman time-dependent rheological model was used to assess the time-dependent p...

Effect of sunflower oil and bambara groundnut flour concentrations on the stability and steady shear flow behaviour of concentrated sunflower oil-in-water (o/w) emulsion stabilized by gelatinized bambara groundnut flour dispersions was studied. Emulsion stability was studied using Turbiscan MA 2000 by observing changes in the average D-backscatteri...

The adsorption kinetics and intraparticulate diffusivity of aniline blue dye onto activated plantain peel carbon has been studied. Two kinetic models, the pseudo first- and second-order equations were selected to follow the adsorption process. Kinetic parameters; rate constants, equilibrium adsorption capacities and correlation coefficients, for ea...

In this present study, the adsorption kinetics and intraparticulate diffusivities of congo red onto unmodified and modified kola nut pod carbons were studied. Two kinetic models, the pseudo first - and second - order equations were selected to follow the adsorption process. Kinetic parameters; rate constants, equilibrium adsorption capacities and c...

The proximate composition of five agricultural wastes were determined and latter subjected to low temperature conversion process in the presence of nitrogen atmosphere.These agricultural wastes are Cocos nucifera husk,Theobroma cacao pod, Kola nitida pods and Plantago major peels(ripe and unripe peels). All the samples investigated have different i...