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  • [ X ]
    Öğe
    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.
  • [ X ]
    Öğe
    Impact of water activity on double layer parameters at the mercury/chlorates(VII) interface in the presence of mixed adsorption layers of 6-mercaptopurine-Triton X-100
    (Springer, 2019) Nosal-Wiercinska, Agnieszka; Kaliszczak, Waldemar; Drapsa, Anna; Wisniewska, Malgorzata; Yilmaz, Selehattin; Yagmur, Sultan; Saglikoglu, Gulsen
    Adsorption mechanism of 6-mercaptopurine, 6-mercaptopurine-Triton X-100 on the mercury electrode surface from 2, 4 and to 6 mol dm(-3) chlorates(VII) was studied as the function of adsorbate bulk concentration. The experimental data obtained from the measurements of differential capacity of the double layer were used, namely the measurements of zero charge potential and surface tension at the zero charge potential. In the case of mixed adsorption layer of 6-mercaptopurine-Triton X-100 domination of 6MP in adsorption equilibria formation as well as competitive adsorption between the 6-mercaptopurine-Triton X-100 molecules were found. Significant contribution of water molecules in the adsorption-desorption processes was also observed.