Department of Chemical Sciences

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    Heat irreversibiility analysis for a couple stress fluid flow in an inclined channel with isothermal boundaries
    (2019) Olalere G. Adeyemi
    Entropy generation in a fully developed couple stress fluid flow through an inclined channel is the focus of the present article. The steady flow of the non-Newtonian fluid via the inclined channel is assumed to be heated isothermally at the boundaries. The formulation of both the fluid flow and heat are based on hydrodynamics and thermodynamics laws. Exact solutions are constructed the dimensionless govern- ing equations. The accuracy of the two solutions are established by direct comparison with the limiting case previously obtained in the current literature. Solution profiles are also presented to demonstrate the effect of variations in the parameter values followed closely by extensive discussions.
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    Preparation and application of nickel copper ferrate and its metal–organic framework composite in the decontamination of chemical indicator contaminated synthetic and raw laboratory wastewater
    (Elsevier Results in Chemistry, 2023-09-23) Olamide A. Olalekan
    Inefficient decontamination of laboratory wastewater polluted by chemical indicators such as methyl orange (MO) and phenolphthalein (PH) is a challenge that requires attention in most developing countries. In response to this, nickel-copper ferrate (NiCuFeO4) and nickel-copper ferrate-terephthalic acid-zinc metal–organic framework composite (NiCuFeO4@MOF-5) were synthesised via simple chemical process and their activities compared for the removal of MO and PH from synthetic and raw laboratory wastewater colleccted from a science laboratory at Federal Polytechnic, Ede, Nigeria. The scanning electron micrograph (SEM) images, revealed the surfaces of NiCuFeO4 and NiCuFeO4@MOF-5 to be rough and homogeneous with tightly arranged particles that are agglomerated. The adsorption capacity of NiCuFeO4@MOF-5 expressed for the removal of MO (30.97 mg g􀀀 1) and PH (41.22 mg g􀀀 1) from aqueous solution is higher than that of NiCuFeO4 for MO (25.82 mg g􀀀 1) and PH (23.00 mg g􀀀 1). NiCuFeO4 and NiCuFeO4@MOF-5 exhibited a promising stability even at the 7th regeneration cycle for the removal of MO and PH from solution. Results obtained for the removal of MO and PH from aqueous solution by NiCuFeO4 and NiCuFeO4@MOF-5 compared favorably with reported adsorbents in literature. Conclusively, NiCuFeO4@MOF-5 is a potential and better adsorbent than NiCuFeO4 for decontaminating laboratory wastewater contaminated with MO and PH.
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    Biochemical Evaluation of potential antibacterial activities of (2,6-Diethylphenyl)-5-Oxopyrolidine Derivatives via in-silico study
    (Journal of Hunan University(Natural Sciences), 2024-07-31) Olamide A. Olalekan
    The focus of several researchers has been drawn to the surge in bacterial activity among humans and the resistance to antibacterial agents. the increasing interest in developing long-lasting antibacterial agents has been observed. therefore, the purpose of this study was to use an in- silico approach to examine the specific inhibitory activities of the of pyrrolidine derivatives against the investigated receptor. therefore, the inhibitory activities of the (2,6-diethylphenyl)-5-oxopyrrolidine derivatives were investigated using an in silico approach. In this study, various software programs were employed, including Spartan 14, AutoDock Tools, AutoDock Vina, and Discovery Studio. Compound 9 exhibits the greatest propensity to yield electrons, as indicated by the calculated HOMO, and according to LUMO and bandgap, compound 5 demonstrates the highest potential to accept electrons and exhibit superior reactivity among the other compounds studied. compounds 8 to 12 displayed the most potent ability to inhibit the bacillus cereus spor-lytic enzyme(PDB ID:4PHQ) and cytolysin A(ClyA) CC6/ 264 ox (6-303) SleL ()PDB ID: 4S3J) compared tp other studied ligands. our findings may open the door for th design of collection of proficient pyrolidine-based drug- like molecules as potential antibacterial agents.
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    Synthesis and application of SeFe2O4@cell for the removal of polyethylene glycol from aqueous solution
    (Environmental Nanotechnology, Monitoring & Management, 2023-12-01) Olamide A. Olalekan
    Water pollution by water-soluble polymers is a severe emerging water challenge that needs urgent attention. Therefore, selenium ferrite immobilized on functionalized cellulose (SeFe2O4@Cell) was prepared for the purification of polyethylene glycol (PEG) polluted water. Characterization of SeFe2O4@Cell revealed the BET (Brunauer-Emmett-Teller) surface area to be 13.50 m2 g−1 and a total pore volume of 0.076 cm3 g−1. The crystallite size using X-ray diffraction (XRD) was 17.32 nm while the scanning electron micrograph (SEM) revealed a heterogeneous surface with irregular shaped particles. The adsorption capacity of SeFe2O4@Cell towards PEG is 39.20 mg g−1 with a percentage removal of 98%, which obeys the Freundlich isotherms. The adsorption mechanism was found to be via electrostatic interaction. The process is pseudo-second-order compliant, spontaneous, and endothermic with (1.0055 kJ mol−1) and (0.0042 kJ mol-1K−1) values within range that describes the process. Conclusively, the study presents SeFe2O4@Cell as a promising material that can be potentially used to purify water contaminated with PEG.
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    Preparation of MOF-5 imprinted chromium ferrite and its application in decontaminating metronidazole and penicillin G contaminated water system
    (Nature, 2025-05) Olamide A. Olalekan
    Metronidazole (MZ) and penicillin G (PG) are antibiotics frequently detected in aqueous systems as pollutants. Their presence in water systems is a global challenge requiring the development of sustainable solutions for water purification. Therefore, this study synthesized and improved the adsorption performance of chromium ferrite (CrFe2O4) via incorporation of metal-organic framework (MOF-5) to produce CrFe2O4@MOF-5 composite. CrFe2O4@MOF-5 and CrFe2O4 were characterized using a series of analytical instrument. Both adsorbents exhibited a four-phase mass loss from the thermogravimetric analysis, while the Brunauer-Emmett-Teller (BET) results gave a surface area of 40.94 m² g− 1 for CrFe2O4 and 59.76 m² g− 1 for CrFe2O4@MOF-5. Interestingly, microscopical images unfolded the surfaces of CrFe2O4@MOF-5 and CrFe2O4 to be heterogeneous, while elemental surface mapping confirmed the constituent elements of CrFe2O4@MOF-5 and CrFe2O4 to be Cr, Fe, O, C and Zn. CrFe2O4@MOF-5 exhibited a higher affinity (91.67 mg g− 1) for PG than CrFe2O4 (53.82 mg g− 1). Similarly, the performance of CrFe2O4@MOF-5 was better (90.24 mg g− 1) compared to CrFe2O4 (50.41 mg g− 1) towards MZ. Both Freundlich and Langmuir isotherm may describe the removal process of MZ and PG by CrFe2O4@MOF-5 while sorption of MZ and PG by CrFe2O4 fitted best for Langmuir isotherm in a sorption mechanism involving electrostatic interaction and pore diffusion. The adsorption performance of CrFe2O4@MOF-5 and its regeneration capacity compared agreeably with most published adsorbents in literature. This current study showed CrFe2O4@MOF-5 as a potential adsorbent for decontaminating MZ and PG-polluted water systems.