Experimental and DFT evaluation of adsorption and inhibitive properties of Moringa oliefera extract on mild steel corrosion in acidic media
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Date
2020-11
Journal Title
Journal ISSN
Volume Title
Publisher
Arabian Journal of Chemistry
Abstract
he corrosion response of mild steel in 0.5 M H2SO4 acid solution in the presence of
Moringer oliefera (MO) leaf extract was investigated using gravimetric, electrochemical, and
DFT techniques. Gravimetric results indicate that MO exhibits a high inhibition value up to
93.0% when the concentration was 1.5 g/L. Inhibition value in general increased with an increase
in concentration of the extracts but decreased with prolonged exposure time and temperature. Anal ysis of polarization curves indicated that MO extract acted as mixed-type inhibitors. The adsorption
process of MO on a mild steel surface in the acid solution fitted the Langmuir isotherm. GC/MS
analysis of MO extract revealed the presence of more than 29 active constituents including 9,12-
Octadecadienoic acid (Z, Z) methyl ester (28.55%); n-Hexadecanoic acid (11.24%); 9,12,15-
Octadecatrienoic acid methyl ester (9.31%), Benzeneacetonitrile, 4-hydroxy-(6.32%), 2-Furancar
boxaldehyde,5-(hydroxymethyl)-(5.6%), Heptadecane (4.85%). Quantum chemical calculations
were applied on some of the identified constituents to assess their adsorbability on the mild steel
surface and the result revealed remarkable high interaction energies
Description
Keywords
Moringa oliefera, Plant extract;, Inhibitor, Experimental technique, DFT technique, Renewable energy, Nigeria, Federal University of Technology Owerri (FUTO), ACE: Future Energies and Electrochemical Systems