Browsing by Author "Owolabi, Rasheed Uthman"

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    An Investigation of the Analytical Potentials of Flower Extracts as Bio-Indicators in Acid Base Titration
    (School of Science and Engineering, Southeast University, Dhaka, Bangladesh, 2018) Owolabi, Rasheed Uthman; Uthman, Mohammed Awwalu; Adejumo, Ayoade Lateef; Aderibigbe, Fatai Alade; Uba, Chinazom Mmasichukwu; Kehinde, Abiola John
    This study investigates the potentials of flower extracts namely, Hibiscus Rosa-sinensis (red hibiscus flower), Plumeria Alba (White Frangipani flower), Bombax Buonopozense (Red flower silk cotton flower) Tabebuia Rosea (Pink trumpet flower) and Tecoma Stans (Yellow bells flower) as bio-indicators and substitutes for commonly used synthetic indicators such as methyl orange and phenolphthalein. The bio-indicators were prepared through sun-drying, pulverisation and solubilisation of the flower petals in solvents (acetone, ethanol, water, acetone/ethanol mixture and ethanol/water mixture) of various solvatrochromic parameters followed by strong agitation at room temperature.Titration of strong acid against strong base was carried out using the prepared five different indicators and the synthetic indicators (methyl orange and phenolphthalein) to serve as control. Plumeria Alba (White Frangipani flower) petals dissolved in ethanol was found to be a highly promising bio- indicator with a competing average titre value of 29.50 cm3 against methyl orange with average titre value of 29.30 cm3.The Fourier transform infra red study shows that the presence of the C=C stretch and vibration band at 1605 cm-1 found in the synthetic indicators used was also present in PLA flower extract. A regression model in terms of solvent polarity, Hasen dispersion bond solubility parameter and and bio-indicator pH was developed for the prediction of average titre values.The model was found to give excellent prediction only for bio-indicators obtained from solvent of low (<25) polarity index.
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    BIODIESEL PRODUCTION FROM PALM KERNEL OIL USING BENTONITE CLAY-SUPPORTED FE-CO NANOCATALYST
    (LAUTECH Journal of Engineering and Technology, 2020) Aderibigbe, Fatai Alade; Adewoye, Tunmise Lateefat; Mustapha, Sherif Ishola; Muhammed, Alhassan Ishaq; Amosa, Mutiu Kolade; Saka, Harvis Bamidele; Mohammed-Nuhu R.A.; Adejumo, Ayoade Lateef; Owolabi, Rasheed Uthman
    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.