On the mechanistic modeling of As(III) adsorption on gibbsite |
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| Authors: | Weerasooriya R Tobschall H J Wijesekara H K D K Arachchige E K I A U K Pathirathne K A S |
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| Institution: | Institut für Geologie und Mineralogie, Lehrstuhl für Angewandte Geologie, Friedrich-Alexander Universit?t, Schlossgarten 5, Nürnberg Erlangen D-91054, Germany. rweerasooriya@hotmail.com |
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| Abstract: | Arsenite adsorption on gibbsite was examined as a function of pH, ionic strength (I) and contact time (t(C)). As(III) showed a weak affinity for gibbsite surface. The trends of pH=f(Gamma(ads)) curves have showed a marked deviation from a typical anion adsorption edge showing a maximum Gamma(ads) around pH approximately 8.2. The experimentally derived proton exchange ratio has always converged to zero when 0.26< summation operator As(III)]<7 microM and 6.2
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