Browsing by Author "Aderibigbe, F. A."

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    Hydrothermic Reduction of Rutile-Ilmenite Mineral Producing an Oxyhydride η-Ti2FeO0.2H2.8: Towards In-Situ Hydrogen Production and Storage
    (NIGERIAN JOURNAL OF TECHNOLOGICAL DEVELOPMENT, 2024-03) Mohammed, I. A.; Mustapha, S. I.; Aderibigbe, F. A.; Hambali, H. U.; Afolabi, A. M.; Muritala, K. B.; Aliyu U. M.
    ABSTRACT: As an alternative to the physical storage of hydrogen as compressed gas or liquid hydrogen requiring high-pressure tanks and cryogenic temperatures, the material-based storage of hydrogen in solids involves hydrogen uptake and release from the surface of adsorbents or within interstitials of hydrides. We report a hydrothermic reduction of rutile-ilmenite mineral into hydrogen-rich fibrous products, η-Ti2FeO0.2H2.8, in an ethanol-water system at 120°C for 4 hrs. As part of a project to generate hydrogen from water-ethanol system using advanced catalysts containing graphene oxide (GO) as carbon source, a system of 62.5 μg graphene oxide per g of rutile-ilmenite mineral was employed in a concentration of 50 mg/mL of ethanol-water solution. As well as in the original mineral, XRD of thermal annealed mineral between 500 and 800°C showed no hydride or phase change in rutile-ilmenite. With hydrothermal treatment of GO/rutile-ilmenite (50 mg/mL) in ethanol-water (1:1 v/v) at 120°C, a hydrogen-rich ferrotitanium hydride phase was formed, and there was a change in morphology from plate-like and granular particles into fibrous structures. Like the release of hydrogen by its ‘carriers’ (e.g., CaH2, NH4BH4, NaBH4, NH3, formic acid), it is anticipated that hydrogen was generated from the ethanol-water system in-situ, which reduced the rutile-ilmenite mineral into a hydride. EDX results showed that the reduction affected specifically the oxides of Fe and aluminosilicates in the mineral. The study demonstrated a possibility of in-situ hydrogen generation and storage via low-temperature graphene oxide hydrothermic reduction of rutile-ilmenite mineral in an ethanol-water system. KEYWORDS: Hydrogen, hydrothermic, ethanol-water, rutile-ilmenite, graphene oxide
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    SELECTIVE ADSORPTION OF Fe (II) OVER Zn (II) FROM PHARMACEUTICAL WASTEWATER
    (COAST JOURNAL OF THE SCHOOL OF SCIENCE, 2021-11) Aderibigbe, F. A.; Saka, H. B.; Amosa, M. K.; Idris, M. O; Bello, T. B; Olufowora, F. O; Adebayo,R. O.; Suleiman, S.
    Abstract This work focused on the utilization of termite mound clay and activated carbon prepared from groundnuts pod for the selective removal of Fe (II) over Zn (II) from Pharmaceutical Wastewater. The initial concentration of Fe (II) [0.46 mg/l] and Zn (II) [0.10mg/l] in the pharmaceutical wastewater were determined using Atomic Absorption Spectrophotometer (AAS). Scanning Electron Microscopy (SEM) technique, Fourier transforms infrared (FT-IR) spectroscopy, X-Ray uorescence (XRF) and X-ray diffraction (XRD) were conducted to investigate the adsorbent features. A preliminary experiment was carried out to determine the suitable adsorbent for optimization studies. Optimization study using Box Behnken experimental design in Response Surface Methodology were employed. The coded levels o selected includes adsorbent loading between 0.05- 0.15 g, temperatures 25 - 45 C and time 30 - 90 mins. o At Optimal condition, 6.6 pH value, the temperature of 25 C, contact time of 90 mins and adsorbent dosage of 0.1 g, the Fe (II) in the Pharmaceutical Wastewater was removed by 95.72 %. The Langmuir 2 adsorption isotherm model was found to have R of 0.9997. The adsorption capacity of the adsorbent was found to be 0.44 mg/g. Adsorption of Fe (II) onto groundnut pod activated carbon and termite mound clay 2 was best described by the pseudo rst order kinetic model (R = 1.000). The termite mound clay and the activated carbonized groundnuts pod shows an effective adsorption towards the removal of the targeted pollutant from the pharmaceutical wastewater. Keywords: adsorption, Box Behnken design, groundnuts pod, pharmaceutical wastewater, termite mound.