Mechanistic modeling of chromate adsorption onto goethite

We have investigated the adsorption of CrO 4 2− onto goethite as a function of pH, background electrolyte and adsorbate loading. Experimental data were interpreted with a three-plane model (TPM) that accounts for spatial charge distribution of inner-sphere surface complexes. In accordance with EXAF...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2000-03, Vol.162 (1), p.167-175
Main Authors: Weerasooriya, R, Tobschall, H.J
Format: Article
Language:English
Subjects:
Chromate
Goethite
Inner-sphere complex
Outer-sphere complex
Three-plane model
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Summary:We have investigated the adsorption of CrO 4 2− onto goethite as a function of pH, background electrolyte and adsorbate loading. Experimental data were interpreted with a three-plane model (TPM) that accounts for spatial charge distribution of inner-sphere surface complexes. In accordance with EXAF spectroscopic data [S. Fendorf, M.J. Eick, P. Grossl, D.L. Sparks, Environ. Sci. Technol. 31 (1997) 315] >FeO 0.2CrO 3 −1.3 and (>FeO) 0.4 2CrO 2 −0.6 surface species were selected for TPM calculations. TPM simulations replicate CrO 4 2− adsorption data well when CrO 4 2− coverage was
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(99)00229-0