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IJSTR >> Volume 8 - Issue 8, August 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Comparison Of Various Adsorption Isotherm Models For Allium Cepa As Corrosion Inhibitor On Austenitic Stainless Steel In Sea Water.

[Full Text]



William-Ebi Duduna, Osaribie Nelson Akeme, Tombiri Mark Zinipere



Allium cepa, Adsorption isotherm, Austenitic Stainless Steel, Corrosion Inhibitor, physisorption, Langmuir, Freundlich, Temkin, El-Awady , weight loss.



The corrosion inhibition study was carried out using weight loss method at room temperature. The values of inhibition efficiency increased with increasing concentration of the allium cepa extract. The values of the Gibbs free energy of adsorption obtained were negative indicating a spontaneous adsorption process. The mechanism of adsorption for the study was physisorption. The El-Awady isotherm model showed that Allium cepa extract occupies more than one active site having 1/y value of 1.4051 greater than one. The adsorption process was an easy one obtained from the Freundlich isotherm parameter 1/n which equals 0.2866 satisfying the condition for easy adsorption. The sorption data of the extract obeyed Langmuir, Freundlich, Temkin, El-Awady and Adejo Ekwenchi isotherm of which Langmuir Isotherm gave the best model fit.



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