James, O. O. and Ajanaku, K. O. and Ogunniran, K. O. and Ajani, Olayinka O. and John, M. O.
(2009)
Adsorption Behaviour of [(4-Hydroxy-6-methyl-2-oxo-2Hpyran-
3-yl)-(4-methoxy-phenyl)-1methyl]-urea on Stainless
Steel in Phosphoric Media.
Portugaliae Electrochimica Acta, 27 (5).
pp. 591-598.
ISSN 1647-1571
Abstract
The adsorption of [(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-(4-methoxy-phenyl)- methyl]-urea on iron in phosphoric media was studied by using electrochemical
technique. The adsorption mechanism was investigated using adsorption isotherms. The experimental data fit localized adsorption models. The values for free energy of
adsorption, o DGads , were also calculated at each surface coverage, �, of the studied compound by applying the mathematical model of Bockris – Swinkels adsorption
isotherm. The variation of free energy of adsorption o
ads DG with surface coverage, �, was interpreted in terms of deviation from ideal condition assumed in Langmuir model. A possible adsorption model of HPU2 molecules on to the metal surface was suggested.
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