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Papers by Oyinlola R Obanla

Journal of Sustainable Materials Processing and Management, Nov 7, 2023

Large amounts of agricultural waste are left unutilized in Nigeria, resulting in detrimental envi... more Large amounts of agricultural waste are left unutilized in Nigeria, resulting in detrimental environmental consequences. particleboard made from such trash would help to reduce deforestation and have a good impact on the environment. The characteristics of particleboard made from corncob (CC) and sugarcane bagasse (SB) with cassava starch and urea formaldehyde as separate binders were compared in this study. CC and SB mix proportions of 90:10, 70:30, and 50:50 percent (by volume) were used to make three layers of medium density particleboard. Manual mixing and blending of 25% and 10% by volume of the different binders and water respectively was done. The mixtures were compressed for 1 hour at 100 °C and 342 kg/m 2. The ASTM D. 1037-12 (2020) and EN 312 (2010) standards were used to evaluate the particleboard. However, particleboard produced from 90 % CC and 10 % SB with cassava starch binder had the greatest modulus of elasticity (MOE) of 444.65 N/mm 2 and modulus of rapture (MOR) of 10.59 N/mm 2. The MOR and MOE data from this investigation allowed researchers to draw the conclusion that while the mechanical qualities of the panels improved as the fraction of CC particles increased, the panels' physical characteristics remained subpar.

Frontiers in Chemical Engineering

Pollution generated by solid waste has become a massive source of concern worldwide as the amount... more Pollution generated by solid waste has become a massive source of concern worldwide as the amount of waste being generated has become overwhelming. Waste paper contributes significantly to the overall solid municipal waste being generated daily and with control methods that are equally bad for the environment or just plain ineffective; better, effective, and environmentally friendly control solutions are required. This study reviews the use of various microorganisms as they aid in the control of waste papers in an environmentally conscious way. In addition to being an environmentally friendly solution to the issue of solid waste paper pollution, it is also a prominent source of renewable energy in the conversion of paper into fermentable sugars for the production of bio-ethanol. This review examines the vital revolution in the enzymatic hydrolysis of paper to sugar. Salient challenges that involve bioconversion were highlighted and a few solutions were suggested.

Beni-Suef University Journal of Basic and Applied Sciences, 2021

@@@In recent times, repellents and synthetic drugs have been identified as having negative toxici... more @@@In recent times, repellents and synthetic drugs have been identified as having negative toxicity effects on humans and the environment. Apart from the unfavourable effects on man and livestock caused by these chemicals-based (synthetic) repellents, they are also expensive, non-biodegradable, and no more effective because mosquitoes are getting adapted. With these drawbacks, an eco-friendly plant-based insecticide as a substitute is needed urgently. This paper reviews the extraction and use of essential oil from the leaves of Mentha spicata, Ocimum gratissimum, and Moringa oleifera as mosquito repellent. Carvone, Eugenol, and 9-Octadecenoic acid were discovered to be the most active components in the M. spicata, O. gratissimum, and M. oleifera extracts, respectively, using gas chromatography-mass spectrometry (GC-MS). Highlights: 1. In recent times, repellents and synthetic drugs have been identified as having negative toxicity effects on humans and the environment. Apart from the unfavorable effects on man and livestock caused by these chemical-based (synthetic) repellents, they are also expensive, non-biodegradable, and no more effective because mosquitoes are getting adapted. 2. An eco-friendly plant-based insecticide as a substitute is needed urgently. 3. Diseases transmitted by mosquitoes are still a significant reason for the global mortality rate, with over 700 million individuals experiencing such diseases every year. With the proper formulation of other repellent forms using their oils, they can replace non-degradable synthetic mosquito repellents since they are eco-friendly. In general, the mosquitocidal activity and percentage protection of plant extract increase with increasing concentration of the extracts in different formulations. This paper is our original work. We certify that this manuscript has not been published in part or whole elsewhere in any language, and it has not been submitted to any other journal for reviews.

ACS Omega, 2021

Rubber seed oil (RSO) (Hevea brasiliensis) was extracted from rubber seeds by chemical means. The... more Rubber seed oil (RSO) (Hevea brasiliensis) was extracted from rubber seeds by chemical means. The effect of temperature on the oil yield was investigated. The experiment suggested that the maximum yield of the oil occurs at 60°C. This is a result of the proximity to the boiling point of nhexane, which is about 68°C. Epoxidized and hydroxylated RSOs were further synthesized by performic acid generated in situ by the reaction of formic acid with 30% hydrogen peroxide. The physiochemical properties of the epoxidized rubber seed oil (ERSO) and hydroxylated rubber seed oil (HRSO) were determined. A separate study was also carried out on castor seed oil (CSO). The improved products were characterized with respect to their configuration and properties. Spectroscopic analysis was carried out on the oil base stocks (RSO, CSO, ERSO, and HRSO). All of the experimental findings were compared with one another. The lubricating properties of CSO and HRSO are further studied as a result of their common hydroxyl nature to ascertain their suitability as a lubricant base. Both oils can be categorized as a nondrying oil with saponification values of 179.52 and 255.25 mgKOH/g, respectively, and as such possess advantageous properties for industrial application. When compared to one another, HRSO appears to be a more effective choice as a lubricant base. This is because of its higher viscosity index of 380.65. The outcomes of this study indicate that hydroxylated and epoxidized RSO with high oxirane content can be synthesized concurrently by one-pot multistep reactions.

Ecotoxicology and Environmental Safety, 2020

The occurrence and distribution of microplastics (MPs) for two seasons (dry and raining) were inv... more The occurrence and distribution of microplastics (MPs) for two seasons (dry and raining) were investigated based on 10 sections of OX-Bow Lake Yenagoa, Nigeria for surface water and sediments. MPs were abundant in colour and dominated by fibrous items. For dry season, Polyethylene terephthalate (PET) and Plasticised polyvinyl chloride (Plasticised PVC) were the predominant MPs; they both account for 72.63% and 10.9% of surface water and sediment samples. The raining season accounted for Plasticised (PVC) 81.5% and low-density polyethylene 4.2% respectively. The raining and dry seasons MPs were characterise by μ-FTIR. Beads and pellets were most common MP shapes in both water and sediment samples for the two seasons. The results showed that there is high presence of MPs in OX-Bow Lake.

The International Journal of Advanced Manufacturing Technology, 2020

Increased rise of industries and car usage in Nigeria and urban development is exponentially on t... more 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.

International Journal of Recent Technology and Engineering (IJRTE)

Rubber seed though not common known is very rich in its oil yield and over time its importance is... more Rubber seed though not common known is very rich in its oil yield and over time its importance is becoming more prominent. Bleaching in the natural sense is relative to the removal of impurities from the oil or material. In this research work, Rubber seed oil was bleached using bentonite clay and Ibeshe clay at 0.5M, 1M and 2M concentrations of Hydrochloric acid. Physiochemical properties as well as spectroscopic analysis such as FT-IR and XRD analysis were carried out and aided in obtaining the bleaching efficiency of both clays. The FT-IR results displayed a visible change in the oil after it was bleached with Ibeshe clay but still retained most its functional group when bleached with bentonite clay. At 2M concentration of the acid, the oil bleached with bentonite showed 53% while with Ibeshe clay it remained at 16%. This summarizes that Ibeshe clay has little to no effect on bleaching performance.

The use of filler in polymer products is as old as the polymer industry itself. Fillers such as g... more The use of filler in polymer products is as old as the polymer industry itself. Fillers such as ground whiting, clay or barytes are added to cheapen the production cost and improve the properties of the final vulcanized products. In this work, the effect of Calcium Carbonate (CaCO3) (filler) in the production of middle layer of PVC carpet was considered and evaluated. The Calcium Carbonate (CaCO3) filler was characterized in terms of moisture content, size (mesh), density and pH value. Eight formulations were prepared: one formulation each for upper layer and back layer, and six formulations for middle layer. The six formulations consist five containing Calcium Carbonate (CaCO3, 700mesh) filler at loading ranging from 20part per hundred (pphr) to 60part per hundred (pphr), while the last formulation for the middle layer contained carbon black at 60pphr as a control. Compounding was carried out using banbury mixer, mixer rollers and calendaring machine. The product was subjected to v...

IOSR Journal of Environmental Science, Toxicology and Food Technology, 2014

The use of vegetable extracts as milk coagulants has evolved recently in soft cheese processing. ... more The use of vegetable extracts as milk coagulants has evolved recently in soft cheese processing. In this study, two types of cheeses were produced from locally sourced raw cow milk using two different coagulants, Calotropis procera leaf and CaCl 2. Protein, fat, Zn, Mg, and Fe were the nutrients and minerals that were assayed. The protein (18.4%), Fat (7.93%), Mg (4.13%), Zn (4.01%), Fe (2.59%) of Calotropis procera coagulated cheese was significantly higher than CaCl 2 coagulant produced cheese with protein content of (9.13%), Fat (5.53%), Mg (2.34%), Zn (2.59%), Fe (1.13%). The higher ash content in the cheese produced with CaCl 2 coagulant makes it susceptible to microbial growth, as a result, reducing its shelf-life. The study suggests that cow milk and Calotropis procera produced cheese appears promising in nutritional contents with further quality improvement.