Browsing by Author "Nwosu, F.O."

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    Adsorption of Chlorotriazine herbicide onto unmodified and modified Kaolinite- Equilibrium, Kinetic and thermodynamic studies
    (ELSEVIER, 2019) Nwosu, F.O.; Ajala, O.J.; Okeola, F.O.; Adebayo, S.A; Olanlokun, O.K.; Eletta, A.O.
    In the recent time, adsorption is a commonly economical way for removal of pollutants from wastewater. Chlorotriazine has been a serious threat to life of both human and animal. Modified kaolinite clays were separately prepared by chemical impregnation method with 2 H2SO4 and 2M NaOH respectively in w/v of 1:2 for a period of 24h to give unmodified kaolinite (UKC), 2 M H2SO4 modified kaolinite (2-AKC) and 2 Mm3 NaOH modified kaolinite clays (2-BKC) respectively. The UKC with maximum intake value (125.3 mg/g) was derived at equilibrium of 1100 mg/L while 96.65 mg g 1 of 2-AKC was obtained at equilibrium of 500 mg L-1 and that of 2-BKC was found at equilibrium of 700 mg/L. the Langmuir isotherm best explained the removal of Chlorotriazine onto various kaolinite clays while pseudo 2nd order kinetics fitted best. Thus, kaolinite clays have been proved as a potential adsorbent for the removal of chlorotriazine molecules.
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    Cooling potential of formulated bio-quenchant oils on cast Aluminium alloy material.
    (University of Chemical Technology and Metallurgy (UCTM), Sofia, Bulgaria, 2020) Adekunle, A.S.; Adeleke, A.A.; Gbadamosi, T.A.; Nwosu, F.O.; Odusote, J.K.; Omoniyi, P.O.; Popoola, O.T.; Adebiyi, K.A.
    The biodegradable vegetable oil based quenchants can serve as cooling media alternative to that of the toxic non-biodegradable petroleum based mineral oil in a heat treatment of aluminium and its alloy. 70 vol. % of edible vegetable oil are blended with 30 vol. % of Jatropha oil to form bio-quenchant oils for Aluminium (Al)-alloy probe treated at 500oC and soaked for 15 min in a muffle furnace. The cooling potential properties such as the cooling rate, the heat transfer coefficient, the Grossman quench severity and the biot number are investigated. The results obtained show that the blended bleached (BB) melon oil provides the highest cooling rate of 49.30oC s-1, while the blended raw (BR) palm oil ensures the lowest cooling rate of 18.45oCs-1. Heat transfer coefficients of 704.6 Wm-2K-1, 432.3 Wm-2K-1, and 394.4 Wm-2K-1 are exhibited by the blended bleached melon oil, the blended raw melon oil and the blended bleached groundnut oil, respectively. They are found higher than that of a petroleum based mineral oil, which amounts to 68.7 Wm-2K-1. The lowest heat transfer coefficient of 272.11 Wm-2K-1 is obtained in case of using a blended raw palm oil. The quench severity of the blended bleached melon oil, the blended raw melon oil and the blended raw groundnut oil refers to a Grossman H-factor of 1.01 m-1, 0.78 m-1, and 0.67 m-1, respectively. The latter values are higher than that obtained in case of a blended raw palm oil, which is equal to 0.37 m-1. However, the heat flow parameters obtained reveal that the blended bleached and the blended raw melon and groundnut oil can be characterized as fast quenching oils, while the blended bleached and the blended raw palm oil can be characterized as medium quenching oils of results comparable to and even better than those of the industrial petroleum based mineral oil
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    Seasonal Variation Rates of Dust Fall at Motor Parks of University of Ilorin, Nigeria
    (Faculty of Engineering University of Maiduguri, Nigeria, 2019-03-18) Nwosu, F.O.; Olayinka, O.D.; Adebayo, S.A.; Akoshile, C.O.
    The enormous vehicular activities on the commercial motor park of University of Ilorin, Nigeria called for concern especially as there have been continuous increase of students and other users of the parks. This study was carried out to indicate the seasonal variation in the rate of dust fall at three motor parks in the permanent site of the University campus by using the single bucket sampling method. The study was carried out for five months each of wet and dry season periods. The sampling sites were PK1, PK2 and Cl. Gravimetric method was used to quantify the soluble, insoluble, volatile matter and ash. Volatile matter and ash were the component of insoluble dust and the highest rate of insoluble dust deposition was observed in January (2043.12 ± 41.4 and 284.1 ± 35.5 mg/m2/day) for PK2 and Cl and in November (1282.7 ± 64.9 mg/m2/day) for PK1 when their respective traffic density (1509.5 ± 72.1, 29.8 ± 1.2 and 1000.8 ± 48.3 vehicles per hours) was highest. The highest (32713.0 ± 1290.1 mg/m2/day) and lowest (70.6 ± 6.9 mg/m2/day) rate of soluble dust deposition in the study were observed at PK1 for September and February respectively which was suspected to be due to increase and decrease in the amount of rain fall. The Pearson Correlation showed that increases in traffic density were correlated with increases in the rate of insoluble dust fall at various sites and the relationship was in the stronger order of PK2 > PK1 > Cl. The motor parks ambient air was highly contaminate with soluble dust in the wet season and insoluble dust in the dry season their being values are more than the recommended 133 mg/m2/day.