Prediction of iodate adsorption and surface speciation on oxides by surface complexation modeling |
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| Authors: | Takahiro Nagata |
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| Institution: | a Division of Earth and Environmental Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
b Institute of Nature and Environmental Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan |
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| Abstract: | Aqueous iodine species occur mainly as iodide (I−) and iodate (IO3−), depending on redox conditions. The adsorption of IO3− on naturally occurring oxides under oxic conditions is of environmental concern. The adsorption behaviors of IO3− by hydrous ferric oxide (HFO), α-FeOOH, and γ-Al2O3 were examined in this study as functions of pH, ionic strength, and solid concentration. Adsorption data were analyzed using an extended triple-layer model (ETLM) for surface complexation modeling to infer IO3− adsorption reactions and equilibrium constants. Results of ETLM analysis suggest that adsorption of IO3− is both an outer-sphere and an inner-sphere process, as expressed by the following complexation reactions, which are consistent with the independent pressure jump kinetic results and adsorption enthalpy measurements |
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