Browsing by Author "Adewoye, Tunmise L."
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Item BIODIESEL PRODUCTION FROM PALM KERNEL OIL USING BENTONITE CLAY-SUPPORTED FE-CO NANOCATALYST(2020-11-21) Aderibigbe, Fatai A.; Adewoye, Tunmise L.; Mustapha, Sherif I.; Mohammed, Ishaq A.; Amosa, Mutiu K.; Saka, Harvis B.; Muhammed-Nuhu, Rafiat A.; Adejumo, Ayoade L.; Owolabi, Rasheed U.This study is focused on the development of a heterogeneous Fe-Co bimetallic nanoparticle on Pindiga bentonite clay support to be used in the production of biodiesel. The local clay was beneficiated and used in the preparation of catalyst by wet impregnation method. The X-ray Fluorescence analysis (XRF) of the bentonite clay showed the presence of several metals and metallic oxides with good catalytic effect. Characterization of the prepared catalyst using Fourier Transform Infared Ray (FTIR), Energy Dispersive Spectrometer,(EDS) X-Ray Dispersion (XRD) and Scanning Electron Microscopy (SEM) confirmed the functional groups, elemental compositions, crystallinity, and morphology of the catalyst respectively. The catalyst was evaluated in biodiesel production using Box-Behnken optimization by varying the methanol: oil mole ratio, reaction temperature, reaction time, and catalyst concentration. An optimum yield of biodiesel (93.8%) was obtained at process condition of 15: 1 methanol: oil mole ratio, 55 C reaction temperature, 1 h, reaction time, and 15%(w/w) catalyst concentration. Physicochemical properties of the biodiesel produced using the developed Fe-Co/bentonite nanocatalyst showed that the biodiesel is of good quality. This was further confirmed by the FAMEs profile. Therefore, the Fe-Co/bentonite nanocatalyst showed potential application as heterogeneous nanocatalyst for the trans-esterification of vegetable oil to biodiesel, an alternative and sustainable replacement for conventional petroleum diesel.Item HETEROGENEOUS CATALYSIS USING BENTONITE SUPPORTED Fe-Co-Ni TRIMETALLIC NANOPARTICLES(2021) Aderibigbe, Fatai A.; Adewoye, Tunmise L.; Mustapha, Sherif I.; Mohammed, Ishaq A.; Saka, Harvis B.; Ajala, Elijah O.; Oluwaseyi, Soile SHerein, the synthesis and characterization of a bentonite-supported Fe-Co-Ni trimetallic nanocatalyst applied in transesterification reaction was reported. The synthesized heterogeneous catalyst was used to investigate the production of biodiesel by varying the reaction parameters using Box-Behnken design response surface methodology (RSM-BBD). An optimum biodiesel yield of 95.2% was obtained at methanol to oil ratio of 10: 1, reaction time of 2 hours, reaction temperature of 55 and catalyst concentration of 5%(w/w of the oil). The biodiesel produced was later analysed using GC-MS analysis and the results shows a fatty acid methyl esters (FAME) profile that confirms the presence of biodiesel.Item Kinetic Modelling of Oil Extraction from Neem Seed(2014) Ogunleye, Oladipupo O.; Adewoye, Tunmise L.; Salawudeen, Taofeeq O.The suitability of three different types of extraction kinetic models (one- step, two –step and three – step models) for neem oil was investigated in this study. Solvent extraction using n-hexane at temperatures range between 303K and 323 K ; 360minutes of extraction time were experimented and the oil yield calculated. The three models were fitted to the experimental data obtained. The oil yield increased from 31.80 % to 41% at 303K and 323 K, respectively and the equilibrium was reached at 300 minutes. The saturation extraction capacity (Cs) increased from 35.0631 gL-1to 42.9698 gL--1303K and 323 K, respectively for one step model and the R2 ranged between 0.9874 and 0.9998. The washing mass transfer coefficient (CeW) of oil yields at equilibrium accounts for about 60% of the extraction in the two-step model and the R2 ranged between 0.9840 and 0.9960. The first coefficient of diffusion (wed1) in the three-step model had is higher value than the second (wed2) and R2 ranged between 0.9920 and 0.9980. The three-step model best fitted the experimental data.Item Optimization of the adsorption of total organic carbon from produced water using functionalized multi-walled carbon nanotubes(Elsevier, 2021-01) Adewoye, Tunmise L.; Ogunleye, Oladipupo O.; Abdulkareem, Ambali S.; Salawudeen, Taofeeq O.; Tijani, Jimoh O.This study investigated the removal of Total Organic Carbon (TOC) from produced water by batch adsorption process using adsorbents developed from Multi-Walled Carbon Nanotubes (MWCNTs). The MWCNTs, synthesized by catalytic chemical vapour deposition method using kaolin-supported tri-metallic (iron-cobalt-nickel) catalyst were purified by H2SO4/HNO3 and then functionalized with 1-pyrenebutanoic acid N-hydroxyl succinimidyl ester (PSE). The raw, purified and functionalized MWCNTs were characterized by High Resolution Scanning Electron Microscopy (HRSEM), High Resolution Transmission Electron Microscopy (HRTEM), Brunauer–Emmett-Teller (BET) and Fourier Transform Infrared Spectroscopy (FTIR). In the results, HRSEM/HRTEM revealed the structure, purity and also confirmed the attachment of the PSE molecule onto the nano-adsorbent(s). The BET surface areas of MWCNTs, PMWCNTs and FMWCNTs were 970.17, 869.25 and 831.80 m2/g, respectively while the FTIR established the existence of surface functional groups. The functionalized MWCNTs (FMWCNTs) nano-adsorbent showed superior performance efficiency (93.6%) than the purified MWCNTs (PMWCNTs) (79.2%) as examined under the same batch adsorption condition: 0.02 g adsorbent dosage, 10–90 min contact time and 30 °C solution temperature probably, due the improved wettability resulted from incorporation of PSE. Subsequently, Central Composite Design (CCD) was applied to optimize the process parameters for the sorption of TOC onto FMWCNTs. The CCD in the response surface methodology predicted 260 mg/g adsorption capacity of FMWCNTs in the removal of TOC at the optimum condition of 49.70 min contact time, 34.81 °C solution temperature, and 0.02 g adsorbent dosage. The kinetics data were best described by pseudo-second-order model and thermodynamic parameters suggested that the process was feasible, spontaneous and exothermic. It can be inferred from the various analysis conducted that the developed FMWCNTs nano-adsorbent is effective for removal of TOC from oil-produced water and may be explored for removal of organic contaminants from other industrial wastewater.Item PHENOL removal in refinery wastewater using mixed oxides prepared by green synthesis(2021-01-17) Aderibigbe, Fatai A.; Adewoye, Tunmise L.; Mustapha, Sherif I.; Mohammed, Ishaq A.; Saka, Harvis B.; Amosa, Mutiu K.; Adejumo, Ayoade L.; Owolabi, Rasheed U.; James, Shalom B.Mixed solid oxides are known for their excellent catalytic property and applications in environmental remediation. This study presents a green-synthesis route for magnesium oxide–titanium oxide, a mixed oxide here demonstrated to possess high performance of phenol removal from hydrocarbon refinery process wastewater. Mixed oxide (MgO-TiO 2) was prepared by using the whole extract from leaves of Piliostigma Thonningii as reducing agent. Structural characterization of the mixed oxide was done using X-ray Diffractometer, High Resolution Scanning Electronic Microscopy and Energy Dispersive X-ray. Petroleum refinery raw wastewater having phenol concentration of 19.961 mg/L was treated using the green-synthesized mixed oxide. Adsorptive phenols removal up to 99.5% was achieved with a dosage of 0.04 g/100 mL at temperature of 35 C, and contact time of 1.167 h. By this, the treated water meets the standard acceptable phenol concentration (0.1 mg/L) in wastewater of hydrocarbon refinery.Item Qualitative role of heterogeneous catalysts in biodiesel production from Jatropha curcas oil(Alpha Creation Enterprise, 2020-06-01) Aderibigbe, Fatai A.; Mustapha, Sherif I.; Adewoye, Tunmise L.; Mohammed, Ishaq A.; Gbadegesin, Adebola B.; Niyi, Faith E.; Olowu, Opeyemi I.; Soretire, Akinpelumi G.; Saka, Harvis B.Biodiesel properties are in general attributed to the composition and properties of the oil feedstock used, overlooking the possible impacts of the catalyst preparation details. In light of that, the impacts of different catalyst preparation techniques alongside those of different support materials on the yield, composition, and fuel properties of biodiesels produced from the same oil feedstock were investigated. More specifically, tri-metallic (Fe-Co-Ni) catalyst was synthesized through two different techniques (green synthesis and wet impregnation) using MgO or ZnO as support material. The generated catalyst pairs, i.e., Fe-Co-Ni/MgO and Fe-Co-Ni/ZnO prepared by wet impregnation and Fe-Co-Ni-MgO and Fe-Co-Ni-ZnO prepared by green synthesis (using leaf extracts) were used in the transesterification process of Jatropha curcas oil. Detailed morphological properties, composition, thermal stability, crystalline nature, and functional groups characterization of the catalysts were also carried out. Using Box-Behnken Design response surface methodology, it was found that the green-synthesized Fe-Co-Ni-MgO catalyst resulted in the highest biodiesel yield of 97.9%. More importantly, the fatty acid methyl ester (FAME) profiles of the biodiesels produced using the four catalysts as well as their respective fuel properties were different in spite of using the same oil feedstock.Item Silver and titanium oxides for the removal of phenols from pharmaceutical wastewater(Elsevier, 2021-01-01) Mustapha, Sherif I.; Aderibigbe, Fatai A.; Adewoye, Tunmise L.; Mohammed, Ishaq A.; Odey, Theresa OThis study is focused on the removal of total phenols from pharmaceutical effluent using an adsorbent of silver and titanium oxides-doped activated carbon. The adsorbent was biosynthesized by reducing AgNO3 and Ti (NO3)4·4H2O into their oxides by whole extracts of Shea butter leaves and subsequently doped on activated carbon. The properties of the adsorbent were investigated for its morphology, elemental composition, crystallinity, and surface functional group modifications using HRSEM, EDS, XRD, and FTIR respectively. It was found to exhibit high crystallinity from rutile titania, with particle sizes in the sub – 200 nm range, and surface-modified with aromatics, nitrates, and nitramines that favor adsorption. Batch adsorption studies were performed at different contact time (20–230 min.), temperature (35–50 °C), and adsorbent dosage (0.1–0.5 g/50 mL). An optimum percent phenol removal of 99.86% (conc. 0.3299 mg/L) was obtained at 3 h. 42 min., temperature of 35 °C, and adsorbent dosage of 0.1 g/50 mL. Using the Ag/Ti co-doped activated carbon, removal of phenol from pharmaceutical effluent followed pseudo-second order model, and fitted the Langmuir isotherm.Item Valorization of Sugarcane Bagasse for Hydrogen Rich Gas Production using Thermodynamic Modeling Approach(2022-12) Mustapha, Sherif I.; Mohammed, Ishaq A.; Aderibigbe, Fatai A.; Adewoye, Tunmise L.; Omoarukhe, Frederick O.; Sowole, A. O.Hydrothermal gasification also known as supercritical water gasification (SWG) has been considered a promising approach for converting wet biomass such as sugarcane bagasse into high-quality syngas. This study presents the thermodynamic modeling of the hydrothermal gasification of sugarcane bagasse using Aspen Plus. The effects of process parameters on the composition and yield of product gases were also investigated. It was found that the effect of temperature and biomass concentration were significant in the production of hydrogen-rich gas, while less impact was observed with pressure. The hydrogen gas (H2) produced with the highest mole fraction (56.70 mol%) and yield (103.26 kmol/kg) was obtained at 750°C and low biomass concentration of 10 wt%, while the lowest yield (1.52 kmol/kg) and mole fraction (2.45 mol%) of H2 were obtained at 450°C and high biomass concentration of 50 wt%. Findings from this study also showed that the highest net calorific value (17.55MJ/kg) was reached at 450˚C and 50 wt% of biomass concentration. This study would help to consolidate research on hydrothermal gasification of sugarcane bagasse and optimization of experimental processes and also serve as an important benchmark in the utilization of biomass as a clean energy source for future projects.