Conference Papers & Presentations (Chemical Engineering)

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    Insight into the anti-corrosion performance of Spinacia oleracea extracts as a sustainable corrosion inhibitor for copper in 1M solution of nitric acid
    Sanni, Omotayo; Iwarere, Samuel Ayodele; Daramola, Michael Olawale (EDP Sciences, 2026-01-07)
    Green corrosion inhibitors play a significant role in lowering the rate at which metal corrodes as well as the environmental effect of hazardous substances. Using electrochemical and gravimetric methods, Spinacia Oleracea extract was employed in this work as an environmentally friendly green inhibitor to minimize Cu dissolution in 1 M HNO3. Activated parameters were identified and addressed, with varying inhibitor doses. The extract exhibits a corrosion inhibition efficacy of 98.9% at 500 ppm. Furthermore, its corrosion inhibition performance continuously stays above 90% even at higher temperatures. According to the Langmuir adsorption isotherms, the experimental results show that the adsorption process protects Cu from corrosion. Scanning electron microscopy was used to analyze the surface and show that a protective extract coating had precipitated on the Cu surface. Fourier transform infrared spectroscopy was used to examine the extract's interaction with copper. The application not only broadens the resource utilization of plant extracts but also brings an effective and innovative corrosion inhibitor to the field of environmentally friendly chemistry.
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    A green approach to the corrosion inhibition effect of waste extract on copper in an alkaline environment
    Sanni, O.; Iwarere, S.A.; Daramola, M.O. (EDP Sciences, 2026-01-07)
    Waste extract was examined to inhibit copper corrosion in 0.5 M KOH (alkaline) solutions. The inhibitory action of the waste extract was investigated using potentiodynamic polarization and gravimetric methods. The result indicated that the extract prevented the copper corrosion in the tested environment, achieving 90.68% effectiveness. The polarization test indicates that the extract is a mixed-type corrosion inhibitor, capable of inhibiting both cathodic and anodic processes in the Cu/KOH system. The inhibitory effect was due to the waste extract sticking to the copper surface, which formed a barrier that prevented harmful ions from reaching the metal. The molecules extracted adsorb on the surface of the metal following Langmuir adsorption model, denoting the extract forms a monolayer protective film on the copper surface. Consequently, the waste extract can effectively prevent copper from corroding in an alkaline environment.
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    A synopsis on designing for multi-lifecycle in chemical engineering and the potential impacts on the attainment of circular economy in Africa
    Dunmade, I.S.; Daramola, Michael Olawale (American Institute of Physics, 2022-08-17)
    Please read abstract in article.
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    Social-economic assessment of valorization of faecal sludge into value-added products : case study of selected products in Johannesburg metropolis
    Coleman, A.; Sadare, Olawumi Oluwafolakemi; Aklin, M.; Daramola, Michael Olawale (American Institute of Physics, 2022-08-17)
    Please read abstract in article.
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    Mathematical modelling and kinetics of thermal decomposition of corn stover using thermogravimetry (TGA-DTG) technique
    Mafamadi, M.; Sadare, Olawumi Oluwafolakemi; Bada, S.; Ayeni, A.O.; Daramola, Michael Olawale (American Institute of Physics, 2022-08-17)
    Please read abstract in article.
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    Water defluoridation, water denitrification and water desalination in rural areas in South Africa
    (2010)
    Many borehole waters in rural areas in South Africa are unfit for human consumption because the fluoride (>1,5 mg/ℓ), nitrate-nitrogen (>6 mg/ℓ) and salinity (>1 500 mg/ℓ) concentrations are too high. Ion exchange (IX) and reverse osmosis (RO) technology are available that can be used for defluoridation, denitrification and desalination of water. However, methodology, guidelines and the economics for the use of these technologies in rural areas are not readily available. Therefore, the objectives of this investigation were to develop methodology, guidelines and the economics for the defluoridation, denitrification and desalination of water in rural areas. The capital costs of ion-exchange household defluoridation and denitrification units are estimated at R5 000 each. Operational costs vary from R0,43 to R3,99/kℓ depending on the feed water concentration. The capital cost of a small RO unit to produce approximately 50 ℓ/d defluoridated water is estimated at approximately R3 000. (Operational cost R3,00/kℓ). The capital cost of an RO unit to produce approximately 5 kℓ/d desalinated water is estimated at approximately R20 000. (Operational cost R1,69/kℓ). The capital cost of an RO unit to produce approximately 50 kℓ/d denitrified water is estimated at approximately R150 000. (Operational cost R2,17/kℓ).