Browsing by Author "Adeniyi, Adewale George"

Now showing 1 - 3 of 3
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    Ecotoxicology of glyphosate and recent advances in its mitigation by adsorption
    (Springer Berlin Heidelberg, 2021-01-01) Ighalo, Joshua O.; Ajala, Oluwaseun Jacob; Adeniyi, Adewale George; Babatunde, Esther O.; Ajala, Mary A.
    Glyphosate (N-[phosphonomethyl]glycine) is one of the most popular herbicides now used in agricultural practice. The aim of this paper was to discuss the research progress and innovations in recent years on the mitigation of glyphosate (GLY) from aqueous media by adsorption. The ecotoxicology of GLY was discussed in the domain of its chronic and sub-chronic toxicity, genotoxicity, reproductive toxicity, and carcinogenicity, and potential risks of food contamination were discussed. It was observed that polymers and resins are the best class of adsorbents for GLY adsorption from aqueous media. GLY adsorption was best fit to either Freundlich or Langmuir isotherm depending on the nature of the adsorbent. The pseudo-second-order kinetics was also the best fit for modelling the kinetics of GLY adsorption. A review of the thermodynamics revealed that GLY adsorption was usually spontaneous and exothermic. Research trends and knowledge gaps are in the area of chemical mobility in environmental systems (especially in the presence of other chemical species), the use of heavy metal-laden adsorbent and molecular modelling. Furthermore, it was observed that the ecotoxicology of GLY still has some contentious areas where there is no conclusive stance.
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    Kinetic Study of the Transesterification of Waste Cooking Oil
    (Department of Mechanical Engineering, Gen. Abdusalami Abubakar College of Engineering, Igbinedion University, Okada, Edo State, Nigeria, 2022) Aderibigbe, Fatai Alade; Saka, Harvis Bamidele; Mustapha, Ishola Sherif; Mohammed, Alhassan Ishaq; Amosa, Mutiu Kolade; Adeniyi, Adewale George; Ajala, Elijah Olawale; Babatunde, Esther Olubunmi; Solomon, Bamidele Ogbe
    The rate and cost of biodiesel production has been hampered by the nature of the catalysts and feedstocks used. The bifunctional catalyst prepared from the mixture of 40 wt% sulphonated corncob (acid source) and 60 wt. % calcined cowbone (base source) was employed in the kinetic studies of the waste cooking oil transesterification for biodiesel production. The kinetic reaction tends towards fitting into a pseudo-first order reaction with activation energy (Ea) and collision factor of 21.4833 kJ/mol and 0.4909𝑠−1 , respectively. The effects of each parameter on the production of biodiesel were highlighted. The physicochemical properties such as the flashpoint (403 K), pour point (281.2 K) and cloud point (283.11 K) of the synthesized biodiesel were also obtained. Furthermore, a test on reusability was performed for the bifunctional catalyst and it was found to retain its catalytic potential until the fifth cycle with a percentage catalyst loss of 7 %. This result indicates that the bifunctional catalyst was effective in the kinetic study of the transesterification of waste cooking oil.
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    Modelling of integrated processes for the pyrolysis and steam reforming of rice husk (Oryza sativa)
    (Springer Nature Switzerland, 2019) Adeniyi, Adewale George; Ighalo, Joshua O.; Aderibigbe, Fatai Aderibigbe
    Thermochemical processes can be used to harness the energetic content of agricultural residues. This study utilises ASPEN Plus v8.8 to develop thermodynamic models for pyrolysis and in-line steam reforming of rice husk (Oryza sativa). The pyrolysis simulation at 500 °C and 1 atm gave a product yield of 36.3% oil, 49.6% char and 14.1% gas. Whilst the gas was composed of lighter hydrocarbons, the char was primarily elemental carbon and SiO2. The pyrolysis oil was composed of higher hydrocarbons, an assortment aromatic compounds and pyrolytic water. Optimum parameters for the steam reforming process were 700 °C, 1 atm and a steam-to-gas molar ratio of 7. The product composition at optimal conditions was 67% hydrogen gas, 19% carbon dioxide, 12% carbon monoxide and 2% methane. For a theoretical biomass feed of 200 kg/h and steam feed of 1400 kg/h, the synthesis gas flowrate obtained from the process was 204 kg/h and the rest were char and condensate water. This has gone a long way to reinforce our idea that the energy content of locally sourced rice (O. sativa) husk can be harnessed via different thermochemical techniques to give good yields of very useful products.