Browsing by Author "Azeez, Samsudeen Olanrewaju"

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    Assessment of Cr, Cd and Pb Levels in Tobacco Leaves and Selected Cigarette Samples from Ilorin Metropolis Kwara State, Nigeria
    (2018) Azeez, Samsudeen Olanrewaju; Saheed, Ismaila Olalekan; Ashiyanbola, I O
    The levels of Cr, Cd and Pb in tobacco leaves and some cigarette samples from Ilorin metropolis, Kwara State, Nigeria were collected and analyzed after wet digestion with a freshly prepared 65% HNO3 and35% HCl using atomic absorption spectrophotometry Model No PM 8251 single pen recorder. The results obtained reveal the presence of Cr and Cd in all samples including tobacco leaves. However, Pb was not found in all the samples within the limit of determination. The concentration ranges of Cr and Cd in the samples are 60-100 μg/g and 4-20 μg/g respectively, which was found to be lower than the WHO standard.
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    Assessment of Physicochemical Characteristics of Selected Borehole Waters in Oke-Oyi Community, Ilorin East Local Government Area, Kwara State
    (2017) Saheed, Ismaila Olalekan; Azeez, Samsudeen Olanrewaju; Ayipo, Yusuf Oloruntoyin; Gunu, Usaka C.
    The physicochemical parameters of seven different borehole waters in Oke-Oyi, Ilorin East Local Government Area, Kwara State, Nigeria were assessed to determine it suitability for human consumption. The parameters examined include temperature (28 - 29⁰C), conductivity (414 - 1603 μs/cm), pH (5.71 - 6.57), total hardness (20.2 - 67.3 mg/L). The concentrations of heavy metals determined are Zn (0.010 – 0.022 mg/L), Fe (0.002 - 0.120 mg/L), Cr (0.075 - 0.12 mg/L), Cu (3x10-4 – 2x10-3 mg/L), Co (0.01 - 0.26 mg/L) and Mn (0.082 - 0.94 mg/L). There was no lead detected in two of the borehole water samples while those detected have low concentration range 1 x 10-5 – 6 x 10-5. The results of physicochemical parameters obtained are within World Health Organisation (WHO) limits except for the pH that is slightly lower and the conductivity of OKY 1 that is slightly higher.
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    Assessment of Some Heavy Metals Concentrations in Soil and Groundwater Around Refuse Dumpsite in Ibadan Metropolis, Nigeria
    (2020) Saheed, Ismaila Olalekan; Azeez, Samsudeen Olanrewaju; JImoh, Akeem Adebayo; Obaro, V A; Adepoju, Suraju Adesina
    This study reports the determination of some heavy metals’ concentration in soil and groundwater around refuse dumpsites in five locations in Ibadan Metropolis, Nigeria. Five samples were collected from each soil and ground water locations and analysed for heavy metals(Cd, Co, Pb, Cr, Zn, Mn and Ni)using Atomic Absorption Spectrophotometry. The soil samples were obtained in triplicates at 25cm depth intervals whereas the water samples were obtained from hand dug wells less than 10 m deep. The range of the values of heavy metal concentrations obtained in water is Co (0.01-0.04), Pb (0.01-0.02), Cr (0.02-0.05), Zn (0.40-0.70), Mn (0.02-0.05) and Ni (0.02-0.05), but Cadmium was not detected. The concentrations of Pb and Ni in ground water obtained from Arapaja, Aleshinloye and Alafara were higher than the World Health Organization (WHO) and Standard Organisation of Nigeria (SON) limits. The results obtained showed that the concentrations of Cd, Co, Pb, Ni and Cr in soil exceeded the WHO and SON permissible limits. However, Zn and Mn were below the limit.
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    Box Behnken Design in the Optimization of Rhodamine B Adsorption onto Activated Carbon Prepared from Delonix regia Seeds and Pods
    (2022) Azeez, Samsudeen Olanrewaju; Saheed, Ismaila Olalekan; Adekola, Folahan Adekola; Jimoh, Akeem Adebayo; Aransiola, David Morakinyo; Abdulsalam, Zuliah A
    The uptake of Rhodamine B (RhB) dye onto chemically prepared activated carbon from Delonix regia pods (DPAC) and seeds (DSAC) by response surface methodology was investigated. The activated carbons were prepared with 1 M nitric acid and characterized by BET FTIR, SEM and EDX. The results obtained revealed that the prepared activated carbons DPAC and DSAC with pore diameter 4.04 nm and 3.48 nm respectively possess mesoporous structures. Optimization of the four operating variables viz; concentration, adsorbent dosage, contact time, and pH on RhB adsorption were examined using Box Behnken design (BBD). The maximum removal efficiency of RhB from aqueous solution was achieved at 99.16% and 98.36% for DSAC and DPAC respectively with an initial RhB concentration of 55 mg/L, 0.1 g dosage, pH 12, and 725 min for both adsorbents. The actual values of 99.16% (DSAC) and 98.36% (DPAC) compared with predicted values 101.7% (DSAC) and 99.40% (DPAC) have a good agreement and this confirms the suitability of the proposed model. The adsorption process fitted best into the Freundlich isotherm model. The adsorption process was adequately described by the pseudo second-order kinetics model. Intra-particle diffusion appears to control the adsorption process but is not the only rate-limiting step.
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    Optimization by Box Behnken Design for Eosin Yellow Dye Removal from Aqueous Medium using Date Palm Seeds-Porous Carbon@TiO2 Blend
    (2022) Azeez, Samsudeen Olanrewaju; Jimoh, Akeem Adebayo; Saheed, Ismaila Olalekan; Otun, Kabir Opeyemi; Mustapha, Aliru Olajide; Adekola, Folahan Amoo
    Biological stains are potentially harmful compounds present in the environment, in which Eosin yellow dye (EYD) is one of the most commonly applied stains. In this research, date palm seeds-porous carbon (DPSC) and its TiO2 blend (TiO2-DPSC) were prepared and their e ciency on the removal of EYD from an aqueous medium was investigated. Characterization by SEM, EDX, FTIR and BET surface area was performed on the materials. The BET surface area (542.63 m2/g) and pore diameter (2.02 nm) of TiO2-DPSC were found to be higher than that of DPSC (332.74 m2/g and 1.85 nm) indicating that TiO2-DPSC is mesoporous while DPSC is microporous. The major and interactive impacts of the adsorption parameters: initial EYD concentration, pH, adsorbent dose, and time of contact were examined by Box Behnken design in response surface methodology. The high R2 values 0.9658 and 0.9597 for DPSC and TiO2-DPSC agreed with the adjusted R2 values suggesting the quadratic model su ciently interprets the adsorption data. The optimum removal e ciency of EYD onto DPSC and TiO2-DPSC was 34.63 mg/g and 55.34 mg/g which are in agreement with the predicted removal of 34.75 mg/g and 50.11 mg/g respectively at the center point values of Co=300 mg/L, pH 2, 362.5 min and 0.1 g adsorbent dose. The results also showed the acceptability of the Box Behnken design in response surface methodology for the optimization of EYD removal from aqueous media using DPSC and TiO2-DPSC blends. Hence, better EYD removal reported in TiO2-DPSC compared to DPSC was due to its improved adsorptive features.
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    Optimization of p-Nitroaniline Adsorption from Aqueous Medium by TiO2-Flamboyant Seeds Activated Carbon Composite
    (2022) Azeez, Samsudeen Olanrewaju; Jimoh, Akeem Adebayo; Saheed, Ismaila Olalekan; Ogundele, Damilola Tope; Adekola, Folahan Amoo; Abdulsalam, Zuliah Abiola; Ayinla, Kuranga Ibrahim
    Titanium (IV) oxide-flamboyant seeds activated carbon (TiO2-FSAC) composite was studied as a promising adsorbent for p-nitroaniline (p-NA) removal from aqueous media using batch technique. The surface characteristics of the composite were determined by Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Energy Dispersed X-ray Spectroscopy and Brunauer–Emmett–Teller surface area analysis. The results showed that TiO2-FSAC is highly porous with a surface area of 601.77 m2/g and pore diameter in the mesoporous region. Box-Behnken design (BBD) under Response Surface Methodology (RSM) was employed for the optimization of four operating parameters: initial p-NA concentration, pH, adsorbent dosage and time. The results revealed that the amount of p-NA adsorbed increased with an increase in initial p-NA concentration, low pH, and low adsorbent dosage and was not affected by time in the investigated range. The correlation between p-NA adsorption by TiO2-FSAC and the process variables was sufficiently established by the quadratic model with a high R2 value (0.973), which is in agreement with adjusted R2 (0.945). The optimum amount of p-NA adsorbed was 45.0 mg/g accomplished at Co = 300 mg/L, pH 2, 0.1 g adsorbent dosage and 362.5 min time.
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    Preparation of TiO2-activated kaolinite composite for photocatalytic degradation of rhodamine B dye
    (2022) Azeez, Samsudeen Olanrewaju; Saheed, Ismaila Olalekan; Adekola, Folahan Amoo; Salau, Shina S.
    Rhodamine B (RhB) is one of the prominent dyes discovered to be carcinogenic and mutagenic substance present in the ecosystem. Alteration of the characteristics of TiO2 through modification with clay influences the behavior of some organic molecules at its surface, and thus its photocatalytic properties. This study investigates the photocatalytic degradation of RhB using TiO2-activated kaolinite composite (TiO2-AKC). TiO2-AKC was prepared in absolute ethanol and characterized using SEM, EDX, TEM, BET and FTIR. The photodegradation of RhB using TiO2-AKC at room temperature under visible-light was studied at various time intervals and the concentration of RhB was monitored using Ultraviolet-Visible spectrophotometer. Characterisation of TiO2-AKC revealed an adequate distribution of TiO2 over the AKC surface, with an enhanced surface area (TiO2-AKC 808 m2g-1, TiO2 50.0 m2g-1, AKC 20.6 m2g-1) necessary for effective degradation. The degradation was efficient in TiO2-AKC than in sole TiO2 resulting in 99.51% and 88.35%, respectively. The experimental data was analysed using zeroth and first order kinetics, parabolic diffusion, and modified Freundlich model. The degradation kinetics conforms to first order kinetics in TiO2-AKC and sole TiO2. The mechanism of the degradation using TiO2-AKC fit into modified Freundlich model and parabolic diffusion model while sole TiO2 was best described by parabolic diffusion model.