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Experimental and DFT evaluation of adsorption and inhibitive properties of Moringa oliefera extract on mild steel corrosion in acidic media
- Source :
- Arabian Journal of Chemistry, Vol 13, Iss 12, Pp 9270-9282 (2020)
- Publication Year :
- 2020
- Publisher :
- Elsevier, 2020.
-
Abstract
- The 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. Analysis 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-Furancarboxaldehyde,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.
- Subjects :
- Heptadecane
Inhibitor
General Chemical Engineering
Moringa oliefera
02 engineering and technology
010402 general chemistry
Electrochemistry
01 natural sciences
Corrosion
Moringa
lcsh:Chemistry
symbols.namesake
chemistry.chemical_compound
Adsorption
Hydroxymethyl
Experimental technique
Langmuir adsorption model
DFT technique
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Plant extract
chemistry
lcsh:QD1-999
symbols
Gravimetric analysis
0210 nano-technology
Nuclear chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 18785352
- Volume :
- 13
- Issue :
- 12
- Database :
- OpenAIRE
- Journal :
- Arabian Journal of Chemistry
- Accession number :
- edsair.doi.dedup.....6da0f7ba903ed48037b83e4110fe0790