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On the mechanistic modeling of As(III) adsorption on gibbsite.

作者信息

Weerasooriya R, Tobschall H J, Wijesekara H K D K, Arachchige E K I A U K, Pathirathne K A S

机构信息

Institut für Geologie und Mineralogie, Lehrstuhl für Angewandte Geologie, Friedrich-Alexander Universität, Schlossgarten 5, Nürnberg Erlangen D-91054, Germany.

出版信息

Chemosphere. 2003 Jun;51(9):1001-13. doi: 10.1016/S0045-6535(03)00157-7.

DOI:10.1016/S0045-6535(03)00157-7
PMID:12697191
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<pH<8.2. The isosteric heat of adsorption, DeltaH(r), exhibited invariant behavior with respect to Gamma(ads). The As(III) adsorption data was quantified by charge distribution multi-site complexation (CD MUSIC) model using the surface complex postulated below:

摘要

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