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Adsorption of Selected Amino Acids at the Mercury/Aqueous Solution Interface from the Chlorate (VII) and Its Dependence on the Supporting Electrolyte Concentration
(Sage Publications Inc, 2015) Nosal-Wiercinska, Agnieszka; Grochowski, Mariusz; Wisniewska, Malgorzata; Tyszczuk-Rotko, Katarzyna; Yilmaz, Selehattin; Yagmur, Sultan; Saglikoglu, Gulsen
In this study, we compared the adsorption of methionine, cysteine and cystine at the mercury/chlorate (VII) interface. Changes in the surface tension with the potential of the zero charge gamma(z) and relative surface excess Gamma' of methionine, cysteine and cystine as a function of their concentration indicate that the adsorption of the studied amino acids increases in the order of methionine > cystine > cysteine. For all the systems examined, linear dependences ln[x(1-Theta)/Theta = f(Theta)] (Frumkin isotherm) and ln (Gamma'/c) = f (Gamma') (virial isotherm) were obtained. Changes in the adsorption parameters as a function of the supporting electrolyte concentration indicate the competitive adsorption of amino acids and ClO4- ions and electrostatic interactions between the water dipoles and adsorbates in the double layer.