1 Department of Chemical Sciences, Federal University of Wukari, Taraba State Nigeria.
2 School of the Environment, Florida Agriculture and Mechanical University, USA.
3 Department of Mechanical Engineering, University of Benin, Nigeria.
4 Department of Biomedical Technology, Federal University of Technology, Akure, Ondo State Nigeria.
5 Department of Environmental Science, Florida Agricultural and Mechanical university, USA.
6 Department of Biochemistry, Federal University Oye-Ekiti, Ekiti State.
Research Article
World Journal of Advanced Research and Reviews, 2024, 23(01), 3051-3082
Article DOI: 10.30574/wjarr.2024.23.1.2305
Received on 20 June 2024; revised on 28 July 2024; accepted on 31 July 2024
Copper corrosion inhibition by Luffa cylinderica leaf extract has been studied in 0.01M Sodium hydroxide solution (NaOH) using electrochemical measurement. Inhibition efficiency increase as the inhibitor concentration increases and decrease with temperature while corrosion rate decreases with concentration and increase with rise in temperature. At the optimum concentration (1000mg/L), the highest inhibition efficiency of plant extract was found to be 72.1846% at 303K and 68.1242% at 313K , and the corrosion rate (10-5) was 1.2679 at 303K and 1.4059 at 313K. However, increase in temperature decreased the inhibition efficiency at the temperature range studied. The phenomenon of physical adsorption has been proposed from the activation energy values (3.8933 to 7.9793 kJ mol-1) with Luffa cylinderica leave extract and the heat of adsorption, Qads ranges from (-26.4619 to - 15.3085 kJmol-1) for concentration of inhibitor studied. These values are negative and suggestive of adsorption on metal surface. The surface morphology and the composition of copper metal were also examined using SEM and XRD analysis respectively. The data obtained from this study fits well into the Langmuir adsorption isotherm.
Adsorption; Luffa cylinderica; Corrosion inhibition; Efficiency; Corrosion rate; Isotherm.
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Olasunkanmi John Afolabi, Alfred Ikpi Onen, Rabi Elabor, Odion Beston Akhabue, Adefemi Oluwasegun T, Ogechi Judith Madukwe and Olayinka Olakunle Oyebanji. Adsorption characteristics of Luffa Cylindrica leaf extract as a corrosion inhibitor of copper in alkaline environment. World Journal of Advanced Research and Reviews, 2024, 23(1), 3051-3082. Article DOI: https://doi.org/10.30574/wjarr.2024.23.1.2305