Browsing by Author "Adekola, Folahan Amoo"

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    Adsorption of p-Phenylenediamine onto Activated Carbon Prepared from Jatropha curcas and Terminalia catappa Seed Coats
    (2016) Saheed, Ismaila Olalekan; Adekola, Folahan Amoo; Olatunji, Gabriel Ademola
    This research work is concerned with the applicability of sodium hydroxide-activated carbon prepared from Jatropha curcas seed coats and Terminalia catappa seed coats in the removal of p-phenylenediamine (PPD), a component of hair dye industrial effluent. The surface characteristics of the prepared activated carbons were examined using Scanning Electron Microscopy (SEM), Brunauer- Emmett-Teller (BET) surface area analysis and Fourier Transform Infrared Spectroscopy (FTIR). The influence of various factors such as initial concentration, pH, contact time, adsorbent dose and temperature were studied and the p-phenylenediamine adsorption capacity was found to be 32.4 mg/g and 45.5 mg/g for Jatropha activated carbon (JAC) and Terminalia activated carbon (TAC), respectively. The experimental data were analysed using Langmuir, Freundlich and Dubinin-Radushkevich isotherms. The data could be fitted successfully for both systems by the Langmuir and Freundlich isotherms. The data show also that the sorption process is exothermic and that it follows pseudo second order kinetics.
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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.
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    Sorption Study of Methylene Blue on Activated Carbon Prepared from Jatropha curcas and Terminalia catappa Seed Coats
    (2017) Saheed, Ismaila Olalekan; Adekola, Folahan Amoo; Olatunji, Gabriel Ademola
    This research work targets the effectiveness of the prepared activated carbon from Jatropha curcas and Terminalia catappa seed coats for adsorption of methylene blue (MB) from aqueous solution. The prepared Jatropha activated carbon (JAC) and Terminalia activated carbon (TAC) were characterised using Fourier Transform Infrared Spectroscopy (FTIR), Scanning electron microscopy (SEM), and Brunauer- Emmett-Teller (BET) surface area analysis. Effects of initial concentration, pH, contact time, adsorbent dose and temperature on the adsorption experiments were studied and the concentration of methylene blue was monitored using spectrophotometry. The adsorption capacities of these adsorbents were found to be 37.84 mg/g and 17.44 mg/g for methylene blue uptake by JAC and TAC, respectively. The experimental data were analysed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherms. The data fitted best into Langmuir isotherm for Methylene blue-JAC and Methylene blue-TAC systems. The kinetic studies fitted into pseudo second order kinetics model. The process chemistry was exothermic.