article · Chemical and Biochemical Engineering Quarterly
This research evaluates the use of Pulicaria odora leaf extract as an eco-friendly corrosion inhibitor and as a medium for green nanoparticle synthesis. When applied to SS308 steel in a 1 mol per litre hydrochloric acid solution, the ethanolic extract achieved a maximum corrosion inhibition efficiency of 94.6 percent at a concentration of 500 ppm. Electrochemical analyses show that the extract functions as an anodic inhibitor, with molecules adsorbing spontaneously onto the metal surface in accordance with the Langmuir isotherm. In addition, the extract was utilised to sustainably synthesise copper oxide nanoparticles in good yield. The resulting nanoparticles demonstrated notable photocatalytic activity in the degradation of methylene blue, alongside significant antimicrobial efficacy against tested bacterial strains.
Industrial steel infrastructure degrades quickly in acidic environments, requiring protective treatments that often rely on toxic chemicals. Using plant extracts provides a non-toxic, sustainable alternative for corrosion prevention. Furthermore, using the same plant extract to manufacture multifunctional copper oxide nanoparticles supports greener chemical processing for industrial wastewater treatment and antimicrobial applications.
This early-stage laboratory research could enable bio-based corrosion protection formulations for industries handling acid solutions, as well as green catalytic materials for wastewater management and microbial control. Potential users include industrial chemical suppliers and water treatment operators. Further development and testing under operational conditions would be required before these applications could approach commercial deployment.
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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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DOI: 10.15255/cabeq.2025.2429
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