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- ItemCarbonated Sandcrete-Nanographene Oxide Mortar: Investigating Morphology, Phase Formation, and CO2 Sequestration for Enhance Durability(Faculty of Engineering, University of Benin, Benin City, Edo State, Nigeria, 2024-12-30) 1) Abdullahi, M., Odigure, J.O., Yabagi, I.A., Azeez, S.O.The escalating trend in carbon dioxide emissions is unequivocally linked to global warming and climate change phenomena. This study investigated the morphological development and phase formation of carbonated sandcrete nanographene oxide (S-nGO) composite mortar for CO2 sequestration and durability under ambient conditions (30±2 °C; 50% RH) after 28 days. A comprehensive characterization methodology incorporating X-ray Diffractometer (XRD), X-ray Fluorescence (XRF), Thermogravimetry Analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR), EnergyDispersed Spectroscopy (EDS), and Scanning Electron Microscopy (SEM) was used to establish correlations between microstructural changes, degree of porosity, CO2 sequestration, and carbonate concentration. Incorporating nGO during the carbonation transformation in cement-based composites substantially alters the sandcrete matrix's hydration kinetics and associated hydrates, exerting a profound influence on the hydration mechanism. Unlike the control without nanographene oxide, the SEM of S-nGO matrix composites showed a dense microstructure characterized by a foil-like morphology of calcium silicate hydrate (C-S-H) phase containing more carbon, calcium, oxygen, and silicon. The 0.05% S-nGO composite mixture resulted in the highest carbon dioxide sequestration potential, with a carbonate concentration of 0.0406 kg/m3, whereas that of the 0% nanographene oxide control sample was approximately 0.0128 kg/m3 at 30 °C. The findings demonstrated that early-age carbonation (1–28 days) could enhance the durability of the sandcrete–nanographene oxide composite by refining the microstructure and reducing the porosity, thereby improving the material’s overall properties and carbon sequestration potential.
- ItemSynthesis, FT-IR Spectroscopic Studies and in vitro FRAP Assay of some Chalcone Derivatives and their Metal Complexes(ACADEMIC STAFF UNION OF UNIVERSITIES, 2022) Bale, Adebayo Tajudeen; Daramola, Kehinde Dele; Osunniran, Wahab AdesinaA variety of substituted chalcones, namely, 3”-aminochalcone, 2”,4”-dichlorochalcone, 2”-methoxychalcone, 4”-methoxychalcone and 2”-hydroxychalcone have been synthesized by Claisen-Schmidt condensation and characterised by melting point and FT-IR spectroscopic technique. The tin(II), cadmium(II) and copper(II)) complexes of the 2”-hydroxychalcone (4E2HC) with the formula [M(L)2] were subsequently prepared. The 2”-hydroxychalcone and its metal complexes were evaluated for in vitro radical scavenging activity by carrying out ferric reducing antioxidant power (FRAP) assay. In almost all cases, the metal complexes exhibited higher activities than the ligand (chalcone). Notable activity (11.63 µM) was observed for the cadmium complex of the 4-ethoxy-2”-hydroxychalcone at 10 µg/mL. Limited structure–activity relationship (SAR) was established by considering the effect of different groups attached to the aryl rings and the metal centers on varying antioxidant activity. The enhanced activity may be due to the presence of electron-rich metals and electron-releasing ethoxy (-OC2H5) and hydroxy (–OH) groups. The confirmed bioactive compounds from this study can be used as effective template in medicinal chemistry for drug discovery.
- ItemSynthesis and Biological Study of Substituted 2”-Hydoxy, 2”,4”- dichloro Chalcones and Their Co(II), Cu(II) and Ni(II) Complexes for Their Antioxidant and Antimicrobial Potentials(Sami Publishing Company, 2022-02-26) Bale, Adebayo Tajudeen; Fasina, Tolulope Mojisola; Shaibu, Rafiu Olarewaju2-methoxy-2”-hydroxychalcone (2M2HC) and 4-methoxy-2”,4”-dichlorochalcone (4M24DC) and their metal complexes were synthesized, characterized, and confirmed by melting point, FT-IR, UV-Visible, 1H-NMR, EIMS, and AAS spectroscopic techniques. The elemental analysis was done and found following the calculated values. Metal(II) complexes, [M(L1-2)2], [where M = Ni(II), Cu(II), Co(II); L=2-methoxy-2”-hydroxychalcone (2M2HC) and 4-methoxy-2”,4”-dichlorochalcone (4M24DC)] were subsequently prepared. The biological evaluation of the synthesized chalcone derivatives and their metal complexes was done. They were screened for antioxidant and antimicrobial activities. Overall, the ligands (chalcones) and metal complexes demonstrated good to moderate antioxidant and antimicrobial activities.
- ItemNuclear Magnetic Resonance and Infra Red Spectroscopic Studies of some Metal Complexes of Maleoyl-p-Aminobenzoic acid(Faculties of Life and Physical Sciences, University of Ilorin, Nigeria, 2010) Bale, Adebayo Tajudeen; Eke, Uche BasilMetal complexes of p-Aminobenzoic acid derivative of maleic anhydride were investigated. Thus, N-(4-carboxy-phenyl) maleimide and its sodium salt (sodium N-maleoylbenzoate) were prepared. The sodium salt was complexed with some transition metals (Co2+, Ni2+, Zn2+ and Cu2+). Complexes separated as precipitates from the reaction mixtures and were characterized by spectroscopic studies.
- ItemSynthesis, Characterization and α-Amylase Inhibition Study of Substituted Schiff Base and Its Metal Complexes(2023-12-31) Bale, Adebayo Tajudeen; Osunniran, Wahab Adesina; Ajiboye, Abdulfatai TemitopeMechanochemical synthesis is considered as a green and sustainable approach to chemical reactions since it requires little or no solvent, making the process more environmentally friendly by reducing waste and minimizing solvent related hazards. In this study, substituted Schiff base was synthesized from 2-aminophenol and 2- hydroxy-1-naphthaldeyde via mechanochemical synthesis method. The metal complexes were synthesized by reacting the ligand with metal(II) chlorides in ratio 2:1. The synthesized compounds were characterized by colour, melting point, molar conductivity, FT-IR, and UV-Vis spectroscopy. The ligand and its metal complexes were screened for α-amylase inhibitory activity. FT-IR results showed absorption bands in between the ranges 1628-1632 cm-1 and 1585-1597 cm-1 indicating the formation of azomethine C=N and aromatic C=C respectively. The metal complexes showed M-O absorption bands in between the range 519-579 cm-1 and M-N band in between the range 461-484 cm-1. The synthesized compounds displayed significant inhibitory activities (IC50: 2.00-8.43 mg/mL) against α-amylase comparable to the reference compound, acarbose (IC50: 9.12 mg/mL). These compounds can serve as viable templates in the formulation of new active antidiabetic drugs.