Adsorption of cinnamaldehyde at the mercury-water interface |
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| Authors: | D Gonzalez-Arjona R Andreu M Rueda |
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| Institution: | Departamento de Fisicoquimíca Aplicada, Facultad de Farmacia, Universidad de Sevilla, Sevilla, Spain;Departamento de Química-Física, Facultad de Química, Universidad de Sevilla, Sevilla, Spain;Departamento de Fisicoquímica Aplicada, Facultad de Farmacia, Universidad de Sevilla, Sevilla, Spain |
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| Abstract: | The adsorption of cinnamaldehyde from aqueous 1 M KCl has been determined by means of differential capacity, zero charge potential and maximum surface tension measurements. A Frumkin isotherm is obeyed with α = 2.4, corresponding to repulsive interaction, and Γs= 3.5 × 10?10 mol cm?2, which is independent of potential in the range ?350/?750 mV. The standard free energy of adsorption is a quadratic function of potential with maximum adsorption occurring at the potential of zero charge. The interaction of the molecular dipole with the electric field and the partial charge transfer between the electrode and the adsorbate are considered. |
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| Keywords: | To whom correspondence should be addressed |
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