Pulicaria odora Ethanolic Extract as a Corrosion Inhibitor and Its Eco-friendly Synthesis of CuO Nanoparticles for Photocatalytic and Microbial Properties

K. Dob, D. Zouied, M. Khelfaoui, N. Bouzenad, A. Abdennouri and M. Rouainia

Abstract
This work examines the effect of Pulicaria odora leaf extract effect as a green inhibitor on SS308 steel corrosion in a 1 mol L–1 hydrochloric acid solution. The electrochemical results reveal that inhibitory efficiency increases with the concentration of Pulicaria odora leaf extract, reaching a maximum inhibition rate of 94.6 % at 500 ppm. Potentiodynamic polarization curves suggest that the plant extract acts as an anodic-type inhibitor. The polarization and electrochemical impedance findings are in good agreement. Adsorption of the inhibitor on the steel surface is spontaneous and follows the Langmuir isotherm. Furthermore, a copper-based catalyst synthesized using Pulicaria odora extract produced a good yield, and this catalyst showed effective photodegradation of methylene blue. The CuO nanoparticles (NPs) synthesized from Pulicaria odora extract showed significant antimicrobial activity against the tested bacterial strains.

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Keywords
carbon steel, corrosion, EIS, green inhibitor, green synthesis, Pulicaria odora