Daniel T Oyekunle - Academia.edu (original) (raw)

Papers by Daniel T Oyekunle

Journal of Molecular Liquids, Jul 1, 2022

Journal of Physics: Conference Series, 2019

The need for a sustainable energy has given rise to the search for a renewable source of energy. ... more The need for a sustainable energy has given rise to the search for a renewable source of energy. This research study presents the production of soybean oil biodiesel using synthesized guinea fowl eggshell catalyst (renewable catalyst). The catalyst preparation involves calcination at 850 °C for 3 hours in a muffle furnace. It was characterized using X-Ray Flourescence (XRF) and Scanning Electron Microscopy (SEM). Biodiesel was produced using 3-8 wt % of calcined catalyst within a time range of 1-2 hour, methanol/oil ratio of 0.25-0.5 w/w%. The highest biodiesel yield was 87.6% at optimum conditions of 8 wt%, 1.5 hours and 0.25 w/w% for catalyst amount, reaction time and methanol/oil ratio respectively. The biodiesel produced validates the successful synthesis of the guinea fowl eggshell into CaO. Biodiesel was then characterized to determine the acid value, flash point, cetane number, specific gravity, density, iodine value and kinematic viscosity. The characterization result of the...

Process Safety and Environmental Protection

Social Science Research Network, 2022

Journal of Hazardous Materials

The Korean Journal of Food & Health Convergence, Sep 30, 2019

Extraction of oil from Moringa oleifera seed using Response Surface Methodology (RSM) was investi... more Extraction of oil from Moringa oleifera seed using Response Surface Methodology (RSM) was investigated. Effects of three factors namely: sample mass, particle size and extraction time on the response, Moringa oleifera a volume extracted, were determined. The Box-Behnken design of RSM was employed which resulted in 15 experimental runs. Extraction was carried out in a 250 ml Soxhlet extractor with Hexane and Ethanol as solvent. The Moringa oleifera seed powder was packed inside a muslin cloth placed in a thimble of the Soxhlet extractor. The extraction was carried out at 60ºC using thermostatic heating mantle. The solvent in the extracted oil was evaporated and the resulting oil further dried to constant weight in the oven. This study demonstrates that Moringa oleifera oil can be extracted from its seed using ethanol and acetone as extraction solvent. The optimum process variables for both solvent (ethanol and acetone) was determined at sample weight of 40 g, particle size of 325 µm and extraction time of 8 hours. It can be deduced that using acetone as solvent produces a higher yield of oil at the same optimum variable conditions compared to when ethanol was used.

Journal of Physics: Conference Series, 2019

The anaerobic digestion process for biogas production was investigated on food waste (FW) and cow... more The anaerobic digestion process for biogas production was investigated on food waste (FW) and cow dung (CD) using Pseudomonas aeruginosa as inoculum. The food waste and cow dung were co-digested as the substrate with bacteria (P. aeruginosa). Five digesters were prepared to observe the maximum gas production potential, methane production rate and duration for biogas production. Food waste (FW) was co-digested with bacteria in two proportions (1:5ml, 1:10ml) and co-digested with Cow dung (CD) in two proportions (1:1, 1:0.5). The digesters were all operated in batch process under mesophilic condition (35ºC). The daily weights of the tubes were measure and some physical characteristics of the substrate were determined before and after the process. Production of gas started 3-4 days after commencement for the digesters with cow dung, 4-5days for the digesters with bacteria and 3 days with only food waste. Food waste with 1kg, cow dung produced the most biogas with a cumulative volume of...

Journal of Environmental Chemical Engineering

AIMS Energy, 2020

The rise in global energy demand has encouraged exploring into other innovative methods of genera... more The rise in global energy demand has encouraged exploring into other innovative methods of generating renewable fuels from different forms of waste. Due to its accessibility, culinary used vegetable oil is regarded as a potential source for profitable production of biodiesel. In the present study, the viability of producing biodiesel from used vegetable oil (UVO) by utilizing CaO catalyst (derived from the calcination of chicken eggshell and impregnated with KNO3 and NaNO3) was studied. Higher yield of biodiesel was obtained at methanol/oil mole ratio of (9–10) and CaO catalyst concentration of (2.0–3.0) wt/wt% Oil, for the three forms of catalyst used. Also, higher yield of biodiesel was obtained when CaO with impregnated KNO3 was used, followed by the operation involving CaO with impregnated NaNO3. At optimum conditions of methanol/oil mole ratio of 9 and catalyst concentration of 2.4 wt/wt% Oil, the yields of biodiesel obtained were 90% (for unimpregnated catalyst), 92% (using CaO impregnated with NaNO3) and 95% (using CaO impregnated with KNO3). The higher biodiesel yield obtained for CaO impregnated with KNO3 (compared to the yield from CaO impregnated with NaNO3) could be traced to a more reactive nature of potassium and arrangement of electrons of both potassium and sodium. The results of the tests and analysis on biodiesel properties reveal that quality biodiesel were produced from the three forms of catalyst used. This is because, each of the values of the properties considered falls within the ASTM standard.

Environmental Science and Pollution Research

Recently, covalent organic frameworks (COFs) have gained significant attention as a promising mat... more Recently, covalent organic frameworks (COFs) have gained significant attention as a promising material for the elimination of various organic pollutants due to their distinctive characteristics such as high surface area, adjustable porosity, high removal efficiency, and recyclability. The efficiency and selectivity of COFs depend on the decorated functional group and the pore size of the chemical structure. Hence, this review highlights the adsorption removal mechanism of different organic contaminants such as (pharmaceutical and personal care products, pesticides, dyes, and industrial by-products) by COFs from an aqueous solution. Spectroscopic techniques and theoretical calculation methods are introduced to understand the mechanism of the adsorption process. Also, a comparison between the performance of COFs and other adsorbents was discussed. Furthermore, future research directions and challenges encountered in the removal of organic contaminants by COFs are discussed.

Models are sometimes employed to determine some parameters that can be used to distinguish betwee... more Models are sometimes employed to determine some parameters that can be used to distinguish between different types of food samples. Rheological models can be used to predict flow for severe conditions where it is difficult to determine the nature of the fluid flow, consequently it is essential to select the appropriate rheological models. This study aims to propose a rheological model that describes an ideal cassava starch rheological behavior and its influence on state variables such as concentration and temperature in order to validate the rheological models. In this study, five rheological models (namely; Power-law model, Robertson-stiff model, Herschel-Bulkey model, Prandtl-Eyring model and Bigham plastic model) were amended into various statistical model by adding the error variance (e). This study concludes that Herschel-Bulkley model and Robertson-stiff model closely explain the rheological patterns occurring during the production of cassava starch. The sensitivity evaluation...

Science of The Total Environment

Valorization of Biomass to Value-Added Commodities, 2020

Diverse kinds of fuels and chemicals can be obtained from lignocellulosic materials. Biomass, tre... more Diverse kinds of fuels and chemicals can be obtained from lignocellulosic materials. Biomass, trees and plants, including marine ones, are reservoirs for solar energy (conversion of sunlight to cellulosic materials via photosynthesis). Lignocelluloses are domestically available energy resources, and they are abundant and renewable. Renewable energy from lignocelluloses is inexpensive compared to the known conventional energy sources from fossil fuels. Biofuels is used to describe renewable sources of energy derived from wood cellulosic waste materials, marine plants, crops and some other related lignocellulosic materials. The biomass is made up of cellulose, hemicellulose, and lignin in appropriate abundance average of 50: 25: 25, respectively, and other extractable components. Most often, cellulose has the largest composition in the lignocellulosic complex make-up. Cellulose is made up of individual D-glucose units linked together by β-1,4 glucosidic bonds. A highly wellarranged form of crystal areas, which are not permissible to water, are made possible by the hydrogen bonding between the cellulosic molecules. The crystalline part of cellulose is estimated to be about 50-90% of the total biomass with the remaining

The corrosion inhibition performance of the natural honey in H2SO4 acidic medium containing mild ... more The corrosion inhibition performance of the natural honey in H2SO4 acidic medium containing mild steel and stainless steel, using weight loss and electrochemical techniques was investigated. The study involved the determination of the effects of the variation of the concentrations of natural honey inhibitor on the corrosion process. Potentiodynamic polarization for the electrochemical measurements was carried out by using Autolab PGSTAT 101 Metrohm potentiostat. Results obtained showed that increase in natural honey concentration (0–10 v/v%) retards the rate of metal dissolution and hence inhibits the corrosion of the metals. And the efficiency of the natural honey inhibitor increased with increased inhibitor concentration. The Tafel plots showed that the natural honey significantly decreased the corrosion potential (Ecorr) and current density (Jcorr); but increased the surface coverage (𝜃𝜃) and polarisation resistance. Adsorption and thermodynamics studies revealed that the Langmui...

Journal of Physics: Conference Series, 2019

An experimental study has been carried out on an alternative source of energy from citrus peel wa... more An experimental study has been carried out on an alternative source of energy from citrus peel waste. A widely used material, pectin, has been extracted from orange peel (OP) and subsequently converted into ethanol with the use of a bacteria and fungi. Dried peels were split into several particle sizes of 0.075, 0.5, 1.0 and 5 mm. It was noted that OP with 0.75 mm particle size produced pectin of low volume while larger 1.0 mm OP particle size produced a high pectin volume. OP of 802 g was used to produce 1, 770 ml of pectin, this illustrate that citrus fruit (specifically orange) contains pectin in a large quantity. A mixture of E.coli (bacteria) with yeast (fungus), and their individual components were used on pectin obtained. However, it was observed that a mixture of pectin, E.coli & S. cerevisiae, and a combination of sample pectin with E.coli produced an encouraging volume of ethanol as against no ethanol produced when a mixture of sample pectin, yeast and pectin sample only. ...

Chemical Engineering Journal, 2022

Environmental issues emerge as a result of the harmful effects of human activities from different... more Environmental issues emerge as a result of the harmful effects of human activities from different points of sources on biophysical environment. Lots of environmental damages can be rectified. The prevention of further damage can be achieved through the utilization of membrane separation processes. The utilization of membrane separation process to combat environmental pollution illustrates the application of membrane materials to effectively prevent environmental pollution in a sustainable manner. Nano-based membranes usually fabricated from organic polymer-based nanocomposites have proven to be promising membrane separation technology for environmental issues. In this report, we reviewed the role and characterizations of nano-based membranes for environmental applications. Thus, the major points are, firstly, factors influencing nano-based membranes performance and, secondly, important characterization techniques commonly used in characterizing the surface of membranes fabricated wi...

Journal of Molecular Liquids, Jul 1, 2022

Journal of Physics: Conference Series, 2019

The need for a sustainable energy has given rise to the search for a renewable source of energy. ... more The need for a sustainable energy has given rise to the search for a renewable source of energy. This research study presents the production of soybean oil biodiesel using synthesized guinea fowl eggshell catalyst (renewable catalyst). The catalyst preparation involves calcination at 850 °C for 3 hours in a muffle furnace. It was characterized using X-Ray Flourescence (XRF) and Scanning Electron Microscopy (SEM). Biodiesel was produced using 3-8 wt % of calcined catalyst within a time range of 1-2 hour, methanol/oil ratio of 0.25-0.5 w/w%. The highest biodiesel yield was 87.6% at optimum conditions of 8 wt%, 1.5 hours and 0.25 w/w% for catalyst amount, reaction time and methanol/oil ratio respectively. The biodiesel produced validates the successful synthesis of the guinea fowl eggshell into CaO. Biodiesel was then characterized to determine the acid value, flash point, cetane number, specific gravity, density, iodine value and kinematic viscosity. The characterization result of the...

Process Safety and Environmental Protection

Social Science Research Network, 2022

Journal of Hazardous Materials

The Korean Journal of Food & Health Convergence, Sep 30, 2019

Extraction of oil from Moringa oleifera seed using Response Surface Methodology (RSM) was investi... more Extraction of oil from Moringa oleifera seed using Response Surface Methodology (RSM) was investigated. Effects of three factors namely: sample mass, particle size and extraction time on the response, Moringa oleifera a volume extracted, were determined. The Box-Behnken design of RSM was employed which resulted in 15 experimental runs. Extraction was carried out in a 250 ml Soxhlet extractor with Hexane and Ethanol as solvent. The Moringa oleifera seed powder was packed inside a muslin cloth placed in a thimble of the Soxhlet extractor. The extraction was carried out at 60ºC using thermostatic heating mantle. The solvent in the extracted oil was evaporated and the resulting oil further dried to constant weight in the oven. This study demonstrates that Moringa oleifera oil can be extracted from its seed using ethanol and acetone as extraction solvent. The optimum process variables for both solvent (ethanol and acetone) was determined at sample weight of 40 g, particle size of 325 µm and extraction time of 8 hours. It can be deduced that using acetone as solvent produces a higher yield of oil at the same optimum variable conditions compared to when ethanol was used.

Journal of Physics: Conference Series, 2019

The anaerobic digestion process for biogas production was investigated on food waste (FW) and cow... more The anaerobic digestion process for biogas production was investigated on food waste (FW) and cow dung (CD) using Pseudomonas aeruginosa as inoculum. The food waste and cow dung were co-digested as the substrate with bacteria (P. aeruginosa). Five digesters were prepared to observe the maximum gas production potential, methane production rate and duration for biogas production. Food waste (FW) was co-digested with bacteria in two proportions (1:5ml, 1:10ml) and co-digested with Cow dung (CD) in two proportions (1:1, 1:0.5). The digesters were all operated in batch process under mesophilic condition (35ºC). The daily weights of the tubes were measure and some physical characteristics of the substrate were determined before and after the process. Production of gas started 3-4 days after commencement for the digesters with cow dung, 4-5days for the digesters with bacteria and 3 days with only food waste. Food waste with 1kg, cow dung produced the most biogas with a cumulative volume of...

Journal of Environmental Chemical Engineering

AIMS Energy, 2020

The rise in global energy demand has encouraged exploring into other innovative methods of genera... more The rise in global energy demand has encouraged exploring into other innovative methods of generating renewable fuels from different forms of waste. Due to its accessibility, culinary used vegetable oil is regarded as a potential source for profitable production of biodiesel. In the present study, the viability of producing biodiesel from used vegetable oil (UVO) by utilizing CaO catalyst (derived from the calcination of chicken eggshell and impregnated with KNO3 and NaNO3) was studied. Higher yield of biodiesel was obtained at methanol/oil mole ratio of (9–10) and CaO catalyst concentration of (2.0–3.0) wt/wt% Oil, for the three forms of catalyst used. Also, higher yield of biodiesel was obtained when CaO with impregnated KNO3 was used, followed by the operation involving CaO with impregnated NaNO3. At optimum conditions of methanol/oil mole ratio of 9 and catalyst concentration of 2.4 wt/wt% Oil, the yields of biodiesel obtained were 90% (for unimpregnated catalyst), 92% (using CaO impregnated with NaNO3) and 95% (using CaO impregnated with KNO3). The higher biodiesel yield obtained for CaO impregnated with KNO3 (compared to the yield from CaO impregnated with NaNO3) could be traced to a more reactive nature of potassium and arrangement of electrons of both potassium and sodium. The results of the tests and analysis on biodiesel properties reveal that quality biodiesel were produced from the three forms of catalyst used. This is because, each of the values of the properties considered falls within the ASTM standard.

Environmental Science and Pollution Research

Recently, covalent organic frameworks (COFs) have gained significant attention as a promising mat... more Recently, covalent organic frameworks (COFs) have gained significant attention as a promising material for the elimination of various organic pollutants due to their distinctive characteristics such as high surface area, adjustable porosity, high removal efficiency, and recyclability. The efficiency and selectivity of COFs depend on the decorated functional group and the pore size of the chemical structure. Hence, this review highlights the adsorption removal mechanism of different organic contaminants such as (pharmaceutical and personal care products, pesticides, dyes, and industrial by-products) by COFs from an aqueous solution. Spectroscopic techniques and theoretical calculation methods are introduced to understand the mechanism of the adsorption process. Also, a comparison between the performance of COFs and other adsorbents was discussed. Furthermore, future research directions and challenges encountered in the removal of organic contaminants by COFs are discussed.

Models are sometimes employed to determine some parameters that can be used to distinguish betwee... more Models are sometimes employed to determine some parameters that can be used to distinguish between different types of food samples. Rheological models can be used to predict flow for severe conditions where it is difficult to determine the nature of the fluid flow, consequently it is essential to select the appropriate rheological models. This study aims to propose a rheological model that describes an ideal cassava starch rheological behavior and its influence on state variables such as concentration and temperature in order to validate the rheological models. In this study, five rheological models (namely; Power-law model, Robertson-stiff model, Herschel-Bulkey model, Prandtl-Eyring model and Bigham plastic model) were amended into various statistical model by adding the error variance (e). This study concludes that Herschel-Bulkley model and Robertson-stiff model closely explain the rheological patterns occurring during the production of cassava starch. The sensitivity evaluation...

Science of The Total Environment

Valorization of Biomass to Value-Added Commodities, 2020

Diverse kinds of fuels and chemicals can be obtained from lignocellulosic materials. Biomass, tre... more Diverse kinds of fuels and chemicals can be obtained from lignocellulosic materials. Biomass, trees and plants, including marine ones, are reservoirs for solar energy (conversion of sunlight to cellulosic materials via photosynthesis). Lignocelluloses are domestically available energy resources, and they are abundant and renewable. Renewable energy from lignocelluloses is inexpensive compared to the known conventional energy sources from fossil fuels. Biofuels is used to describe renewable sources of energy derived from wood cellulosic waste materials, marine plants, crops and some other related lignocellulosic materials. The biomass is made up of cellulose, hemicellulose, and lignin in appropriate abundance average of 50: 25: 25, respectively, and other extractable components. Most often, cellulose has the largest composition in the lignocellulosic complex make-up. Cellulose is made up of individual D-glucose units linked together by β-1,4 glucosidic bonds. A highly wellarranged form of crystal areas, which are not permissible to water, are made possible by the hydrogen bonding between the cellulosic molecules. The crystalline part of cellulose is estimated to be about 50-90% of the total biomass with the remaining

The corrosion inhibition performance of the natural honey in H2SO4 acidic medium containing mild ... more The corrosion inhibition performance of the natural honey in H2SO4 acidic medium containing mild steel and stainless steel, using weight loss and electrochemical techniques was investigated. The study involved the determination of the effects of the variation of the concentrations of natural honey inhibitor on the corrosion process. Potentiodynamic polarization for the electrochemical measurements was carried out by using Autolab PGSTAT 101 Metrohm potentiostat. Results obtained showed that increase in natural honey concentration (0–10 v/v%) retards the rate of metal dissolution and hence inhibits the corrosion of the metals. And the efficiency of the natural honey inhibitor increased with increased inhibitor concentration. The Tafel plots showed that the natural honey significantly decreased the corrosion potential (Ecorr) and current density (Jcorr); but increased the surface coverage (𝜃𝜃) and polarisation resistance. Adsorption and thermodynamics studies revealed that the Langmui...

Journal of Physics: Conference Series, 2019

An experimental study has been carried out on an alternative source of energy from citrus peel wa... more An experimental study has been carried out on an alternative source of energy from citrus peel waste. A widely used material, pectin, has been extracted from orange peel (OP) and subsequently converted into ethanol with the use of a bacteria and fungi. Dried peels were split into several particle sizes of 0.075, 0.5, 1.0 and 5 mm. It was noted that OP with 0.75 mm particle size produced pectin of low volume while larger 1.0 mm OP particle size produced a high pectin volume. OP of 802 g was used to produce 1, 770 ml of pectin, this illustrate that citrus fruit (specifically orange) contains pectin in a large quantity. A mixture of E.coli (bacteria) with yeast (fungus), and their individual components were used on pectin obtained. However, it was observed that a mixture of pectin, E.coli & S. cerevisiae, and a combination of sample pectin with E.coli produced an encouraging volume of ethanol as against no ethanol produced when a mixture of sample pectin, yeast and pectin sample only. ...

Chemical Engineering Journal, 2022

Environmental issues emerge as a result of the harmful effects of human activities from different... more Environmental issues emerge as a result of the harmful effects of human activities from different points of sources on biophysical environment. Lots of environmental damages can be rectified. The prevention of further damage can be achieved through the utilization of membrane separation processes. The utilization of membrane separation process to combat environmental pollution illustrates the application of membrane materials to effectively prevent environmental pollution in a sustainable manner. Nano-based membranes usually fabricated from organic polymer-based nanocomposites have proven to be promising membrane separation technology for environmental issues. In this report, we reviewed the role and characterizations of nano-based membranes for environmental applications. Thus, the major points are, firstly, factors influencing nano-based membranes performance and, secondly, important characterization techniques commonly used in characterizing the surface of membranes fabricated wi...

CARD International Journal of Engineering and Emerging Scientific Discovery, 2017

This work considers the use ofa solid mineral (limestone) as heterogeneous catalyst for biodiesel... more This work considers the use ofa solid mineral (limestone) as heterogeneous catalyst for biodiesel production from yellow oleander seed oil (YOO). Limestone was crushed and reduced to less than 200 µm, the crushed limestone was separated into eight samples, all of which were prepared by calcinating at 700 o C, and four samples were pre-soaked in methanol while the other four were not. It was noted that pre-soaking pulverized limestone in methanol and calcinating for 5 hours gave the highest calcium content of 58.48% as determined by EDXRF Spectrophotometer (EDX3600B). This was used for biodiesel synthesis. The biodiesel production was performed at catalyst amount of 4 g, reaction time of 70 minutes and methanol/oil ratio of 0.1. The biodiesel yield under this condition was 86.00 % (v/v) this was validated by running three experimental explicate. The physical state of the biodiesel was found to be liquid/reddish-brown at room temperature, acid value of 0.508 (mgKOH/g oil), FFA value of 0.254, iodine value of 73.20 (g I2/100g oil), saponification value of 26.648 (mgKOH/g oil), cetane number of 234.580 among others. Qualities of the yellow oleander biodiesel (YOB) werecompared to standards set by ASTM D6751 and EN 14214.