Browsing by Author "Tijani, Jimoh O."

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    Optimization of nickel (ii) and chromium (iii) removal from contaminated water using sorghum bicolor
    (2017-06-30) Adewoye, Latifat T.; Mustapha, Sherif I.; Adeniyi, Adewale G.; Tijani, Jimoh O.; Amoloye, Mubarak A.; Ayinde, Lawal J
    A central composite design (CCD) under the response surface methodology (RSM) was used to study the effect of three adsorption variables (pH, initial concentration, and adsorbent dosage) in order to determine the optimum process conditions for the adsorptions of Ni (II) and Cr (III) onto sulphuric acid modified sorghum bicolor activated carbon (SBAC). This study yielded removal efficiency of 98.89% for Ni (II) and 94.27% for Cr (III) ion under optimal conditions of pH (8), initial metal ion concentration (25 mg/L), adsorbent dosage (10 mg) and pH (7), initial metal ion concentration (5 mg/L), dosage (15 mg); respectively. Statistical analysis of variance results showed a good correlation existed between the experimental and predicted data with R 2 values of 0.99 for Ni and 0.98 for Cr. The equilibrium data for Ni (II) adsorption was best described using Freundlich model while Langmuir model best fit Cr (III) adsorption. The mechanism of adsorption for both Ni and Cr adsorptions on SBAC followed Pseudo second order kinetic model.
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    Optimization of the adsorption of total organic carbon from produced water using functionalized multi-walled carbon nanotubes
    (Elsevier, 2021-01) Adewoye, Tunmise L.; Ogunleye, Oladipupo O.; Abdulkareem, Ambali S.; Salawudeen, Taofeeq O.; Tijani, Jimoh O.
    This study investigated the removal of Total Organic Carbon (TOC) from produced water by batch adsorption process using adsorbents developed from Multi-Walled Carbon Nanotubes (MWCNTs). The MWCNTs, synthesized by catalytic chemical vapour deposition method using kaolin-supported tri-metallic (iron-cobalt-nickel) catalyst were purified by H2SO4/HNO3 and then functionalized with 1-pyrenebutanoic acid N-hydroxyl succinimidyl ester (PSE). The raw, purified and functionalized MWCNTs were characterized by High Resolution Scanning Electron Microscopy (HRSEM), High Resolution Transmission Electron Microscopy (HRTEM), Brunauer–Emmett-Teller (BET) and Fourier Transform Infrared Spectroscopy (FTIR). In the results, HRSEM/HRTEM revealed the structure, purity and also confirmed the attachment of the PSE molecule onto the nano-adsorbent(s). The BET surface areas of MWCNTs, PMWCNTs and FMWCNTs were 970.17, 869.25 and 831.80 m2/g, respectively while the FTIR established the existence of surface functional groups. The functionalized MWCNTs (FMWCNTs) nano-adsorbent showed superior performance efficiency (93.6%) than the purified MWCNTs (PMWCNTs) (79.2%) as examined under the same batch adsorption condition: 0.02 g adsorbent dosage, 10–90 min contact time and 30 °C solution temperature probably, due the improved wettability resulted from incorporation of PSE. Subsequently, Central Composite Design (CCD) was applied to optimize the process parameters for the sorption of TOC onto FMWCNTs. The CCD in the response surface methodology predicted 260 mg/g adsorption capacity of FMWCNTs in the removal of TOC at the optimum condition of 49.70 min contact time, 34.81 °C solution temperature, and 0.02 g adsorbent dosage. The kinetics data were best described by pseudo-second-order model and thermodynamic parameters suggested that the process was feasible, spontaneous and exothermic. It can be inferred from the various analysis conducted that the developed FMWCNTs nano-adsorbent is effective for removal of TOC from oil-produced water and may be explored for removal of organic contaminants from other industrial wastewater.
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    Optimization of the Preparation Conditions for Activated Carbon from Locust Bean Pod (Parkia biglobosa) Using Factorial Design Approach
    (2018) Eletta, Omodele A. A.; Mustapha, Sherif I.; Tijani, Jimoh O.; Adewoye, Latifat T.; Mohammed, Ishaq A.
    This study focused on the optimization of the preparation parameters (impregnation concentration, activation temperature and activation time) on the yield and adsorption potential of activated carbon (AC) prepared from Locust bean pod (Parkia biglobosa) using the chemical activation method based on factorial design. The two linear regression models developed from the factorial experimental design using Design Expert Software – 6.0.8 was used to determine the optimum production conditions required to provide a compromise between the AC yield and methylene blue (MB) removal efficiency from aqueous solution. The results demonstrated maximum AC yield of 41.6% and MB removal efficiency of 95.4% under the following optimum preparation conditions; H3PO4 impregnation concentration (60 %), activation temperature (444.4 oC) and activation time (30 min). This study showed that the experimental values obtained were in good agreement with the values predicted from the models under the applied conditions.