Adsorption of Selected Amino Acids at the Mercury/Aqueous Solution Interface from the Chlorate (VII) and Its Dependence on the Supporting Electrolyte Concentration


NOSAL-WIERCINSKA A., GROCHOWSKI M., WISNIEWSKA M., TYSZCZUK-ROTKO K., YILMAZ S., YAĞMUR S., ...More

ADSORPTION SCIENCE & TECHNOLOGY, vol.33, pp.553-558, 2015 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 33
  • Publication Date: 2015
  • Doi Number: 10.1260/0263-6174.33.6-8.553
  • Journal Name: ADSORPTION SCIENCE & TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.553-558

Abstract

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.