Choi, Jaeyoung 2024-01-21T03:03:26Z 2024-01-21T03:03:26Z 2021-09-01 2006-06 0045-6535 https://pubs.kist.re.kr/handle/201004/135478 Cadmium sorption experiments were conducted to infer Cd sorption mechanisms to a reference smectite and three fractions of a Vertisol soil. Untreated Vertisol has a higher adsorption capacity for Cd than that of reference smectite. Surface complex modeling was used to calculate the potential contributions of Cd complexation reactions with permanent charge sites and pH-dependent charge sites over ranges in pH, for soils with given surface areas, and sorption site densities. The Langmuir model produced relatively good predictions of Cd sorption on reference smectite and Vertisol. However, the results of the triple-layer model (TLM) were inadequate to describe Cd adsorption on fixed-charge sites because the model could not account for the ion-exchange reaction on the basal plane. Based upon the two geochemical models of Cd adsorption to the reference smectite and Vertisol, it appears that the basal plane siloxane cavities are the most important sites for Cd complexation at pH < 6.5. For the pH-dependent sites, the edge-site aluminol appears to be the dominant surface functional group responsible for Cd adsorption at pH > 6.5. (c) 2005 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD TRIPLE-LAYER MODEL COMPLEXATION REACTIONS PARAMETER-ESTIMATION MULOORINA ILLITE METAL ADSORPTION IONIC-STRENGTH SURFACE OXIDE KAOLINITE OXYHYDROXIDES Geochemical modeling of cadmium sorption to soil as a function of soil properties Article 10.1016/j.chemosphere.2005.10.035 1 CHEMOSPHERE, v.63, no.11, pp.1824 - 1834 CHEMOSPHERE 63 11 1824 1834 scie scopus 000238557000002 2-s2.0-33646498080 Environmental Sciences Environmental Sciences & Ecology Article TRIPLE-LAYER MODEL COMPLEXATION REACTIONS PARAMETER-ESTIMATION MULOORINA ILLITE METAL ADSORPTION IONIC-STRENGTH SURFACE OXIDE KAOLINITE OXYHYDROXIDES MINTEQA2 Langmuir model triple-layer model surface complexation model cadmium soil