Browsing by Author "Baba, A. A."

Now showing 1 - 3 of 3
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    Enrichment of a Nigerian Calcite ore for Hydroxyapatite production
    (Australian Ceramic Society, 2016-10-20) Baba, A. A.; Womiloju, A. A.; Joda, A.; Lawal, A.; Babamale, H. F.; Alabi, A. G. F.; Adekola, F. A.
    In this study, Hydroxyapatite (HAp) powders have been prepared from Calcite ore of Nigerian origin using diammonium hydrogen phosphate as the Phosphorus source via hydrothermal method. The HAp powders formed is used to determine the chemical structure and nature of HAp crystals at different reaction temperature and time of operation were characterized by X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray (EDS) and Fourier Transform Infra-red (FT-IR) techniques. Using a set of experimental conditions, different morphology, crystallinity and stoichiometric ratios were obtained. At optimal conditions (1M (NH4)2HPO4, 850C, 6 hours reaction time), a rectangular, rod-like and layered HAp crystal formed yielded Ca/P molar ratio of 1.66 which is close to the stoichiometric HAp ratio of 1.67 required for biomedical applications.
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    Hydrometallurgical preparation of high-grade industrial manganese compound from a low-grade spessartine ore by Cyanex®272 extractant
    (Taylor and France, 2020-12-01) Abdulkareem, A. Y.; Baba, A. A.; Raji, M. A.; Ayinla, K. I.; Shuaib-Babaita, Y. L.; Salaudeen, O. A.
    This study highlights a hydrometallurgical method for the purification, extraction, and beneficiation of a multi-elemental leach liquor obtained via reductive leaching of spessartine ore, for the production of high-grade manganese compound. During these treatments, the effect of Cyanex®272 concentrations, pH, aqueous: organic (A/O) was quantified. At optimal conditions (Temperature = 27 ± 2°C, 0.2 mol/L Cyanex®272, pH = 4.5, A/O = 1:1), manganese extraction efficiency was >90%. The stripping of the loaded organic phase by 0.1 mol/L sulphuric acids yielded 95.7% in a single stripping stage. The resulting aqueous solution was appreciably beneficiated to produce manganese sulphate monohydrate (MnSO4.H2O: 49–315-9500, melting point = 702.8°C) via precipitation and crystallisation methods. Finally, a flow sheet summarising the analytical treatment steps was provided.
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    Synthesis, Characterization and Antimicrobial Activity of Metal (II) Complexes of Mixed Acetylsalicylic acid and 1, 10-phenanthroline
    (Faculty of Physical Sciences, University of Ilorin, Ilorin, Nigeria, 2017-11-20) Lawala., A.; Shodeinde, A. S.; Obaleye, J. A.; Baba, A. A.
    A series of Mn(II), Fe(II), Co(II), Cu(II) and Zn(II) mixed ligands-metal complexes derived from 1,10phenanthroline (PHEN) and acetylsalicylic acid (ASP) have been synthesized. The compounds were characterized using elemental analysis, infrared, ultraviolet/visible spectroscopies and X-ray powder diffraction .The coordination of the two ligands towards the central metal ion has been proposed in the light of elemental analysis, infrared, ultraviolet/ visible, and X-ray powder diffraction spectroscopic studies. The results of the physical and spectroscopic data confirmed that the ligands are bidentate chelating agents. In 1, 10phenanthroline, coordination occurred through the two pyridinic nitrogen groups. Acetylsalicylic acid complexes coordinate through the carbonyl oxygen of the carboxyl and the ester groups. The compounds form a six- coordinate geometry. Antimicrobial activity of the mixed ligand metal complexes and the free ligands were carried out against the bacteria: Escherichia coli, staphylococcus aureus, klebsiella pneumonia, pseudomonas aeruginosa and the fungi candida spp. The mixed ligands metal complexes showed higher activities when compared to the free ligands of acetylsalicylic acid but were less active than the free 1, 10-phenanthroline ligand. The complexes of Mn (II) showed significant antimicrobial activity while the Fe (II) complex exhibited the least activity against the bacteria and fungi organisms.