Surface Complexation Modeling: GibbsiteThis book provides a description of the generalized two layer surface complexation model, data treatment procedures, and thermodynamic constants for sorption of metal cations and anions on gibbsite, the most common form of aluminum oxide found in nature and one of the most abundant minerals in soils, sediments, and natural waters. The book provides a synopsis of aluminum oxide forms and a clearly defined nomenclature. Compilations of available data for sorption of metal cations and anions on gibbsite are presented, and the results of surface complexation model fitting of these data are given. The consistency of the thermodynamic surface complexation constants extracted from the data is examined through development of linear free energy relationships which are also used to predict thermodynamic constants for ions for which insufficient data are available to extract constants. The book concludes with a comparison of constants extracted from data for sorption on gibbsite with those determined previously for hydrous ferric oxide (HFO), hydrous manganese oxide (HMO), and goethite. The overall objective of this book is the development and presentation of an internally consistent thermodynamic database for sorption of inorganic cations and anions on gibbsite, an abundant and reactive mineral in soils, sediments, and aquatic systems. Its surface has a high affinity for sorption of metal cations and anions, including radionuclides. The gibbsite database will enable simulation and prediction of the influence of sorption on the fate of these chemical species in natural systems and treatment processes in which aluminum oxides are abundant. It thus will help to advance the practical application of surface complexation modeling. |
Contents
Types of Available Data | |
Data Compilation and Treatment Methods | |
Surface Properties of Gibbsite | |
Cation Sorption on Gibbsite | |
Anion Sorption on Gibbsite | |
Coherence and Extrapolation of the Results | |
References | |
Summary of Experimental Details | |
Author Index | |
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Surface Complexation Modeling: Gibbsite Athanasios K. Karamalidis,David A. Dzombak Limited preview - 2010 |
Common terms and phrases
11.0 PH FIGURE 24 hours 25°C Reaction vessel acidity constant adsorbed adsorption Al(OH AlOH alumina aluminum hydroxide aluminum oxide anion sorption anions aqueous arsenate atoms bauxite bayerite best fit Best-estimate Best-estimate sorption constant boehmite cations Chem Colloid Colloid Interface Sci complexation constants concentration Cosmochim crystalline Dzombak and Morel electrolyte Equil equilibrated equilibrium EXAFS experimental fit Best-estimate sorption FITEQL formation Gibbsite Solid prep gibbsite suspension goethite Goldberg Hiemstra hours Measurement hydrolysis hydrous oxides hydroxyl Individual best fit ionic strength ions isotherms kaolinite layer Log Free Log Sortpion Density logK N2 atm NaCl NaNO NaNO3 NaOH nordstrandite phosphate polymorphs Polypropylene precipitation proton samples Soil Sci solution Sorbed sorption constant 0.0 sorption data sorption experiments Sorption on Gibbsite Source Data Set spectroscopic spectroscopic data structure supernatant surface complexation surface species surface-complexation constants surface-complexation modeling Table temperature TOTAL TOTCO two-layer model uranyl values Violante Weerasooriya