Modeling Cd(II) adsorption to heterogeneous subsurface soils in the presence of citric acid using a semi-empirical surface complexation approach


Kantar C. , Ikizoglu G., Koleli N., Kaya O.

JOURNAL OF CONTAMINANT HYDROLOGY, vol.110, pp.100-109, 2009 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 110
  • Publication Date: 2009
  • Doi Number: 10.1016/j.jconhyd.2009.09.003
  • Title of Journal : JOURNAL OF CONTAMINANT HYDROLOGY
  • Page Numbers: pp.100-109
  • Keywords: Surface complexation model, Sorption, Ligand, Transport, Complexation, DISSOLVED ORGANIC-CARBON, URANIUM(VI) ADSORPTION, SORPTION BEHAVIOR, MULOORINA ILLITE, CADMIUM SORPTION, IRON-OXIDE, HUMIC-ACID, METAL-IONS, TRANSPORT, MINERALS

Abstract

Laboratory batch sorption experiments were conducted to understand the effect of citrate on cadmium sorption to heterogeneous subsurface soils. Our results indicate that citrate may have a pronounced effect on Cd(II) sorption depending on system conditions (e.g. pH, ligand concentration). While the presence of citrate had no effect on Cd(II) sorption at pH <4. it led to a decrease in Cd sorption under slightly acidic to alkaline pH range depending on the concentration of citrate used. Maximum effect of citrate on Cd(II) sorption was observed at pHs between 5 and 7. This coincides with the observed range of maximum citrate adsorption and the formation of Cd-citrate complexes.