Modeling the Cd(II) adsorption onto goethite |
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| Authors: | R Weerasooriya H J Tobschall |
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| Institution: | 1. Lehrstuhl für Angewandte Geologie, Institut für Geologie und Mineralogie , Friedrich Alexander Universitat Erlangen‐Nürnberg , Erlangen, D‐91054, Germany;2. Institute of Fundamental Studies , Hantana Road, Kandy, Sri Lanka;3. Institute of Environmental Science and Research , Mt. Eden Science Center , 17 Kelly St, Auckland, New Zealand;4. Lehrstuhl für Angewandte Geologie, Institut für Geologie und Mineralogie , Friedrich Alexander Universitat Erlangen‐Nürnberg , Erlangen, D‐91054, Germany |
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| Abstract: | The surface complexation of Cd(II) to goethite (α‐FeOOH) at varying concentrations of solid, background electrolyte and Cd(II) has been investigated. The data was quantified according to the generalized version of triple layer (TLM) surface complexation model. In the presence of atmospheric CO2, it was found that the experimental data of Cd(I) α‐FeOOH system could be explained satisfactorily by incorporating both the > FeOHCd+ and > FeOCdHCO3 in the calculations. However, at excessive concentrations of Cd(II), typically over 13% surface coverages, the TLM predictions significantly underestimated the experimentally observed data obtained for Cd(II)/α‐FeOOH systems. |
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| Keywords: | Surface complexation model cadmium carbon dioxide |
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