Electrolyte Anion Affinity and Its Effect on Oxyanion Adsorption on Goethite

Rietra, R.P.J.J.; Hiemstra, Tjisse; Riemsdijk, W.H. van

doi:10.1006/jcis.2000.6982

Cited by 82 publications

(80 citation statements)

References 40 publications

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“…The basic charging behavior of both components is determined in separate experiments. The charging behavior of goethite is very similar to the reported charging behavior of goethite by Venema et al (1996) and Rietra et al (2000). Table 3 gives the parameters used to describe this charging behavior with the CD-MUSIC model.…”

Section: Basic Charging Behavior and Fa Adsorptionsupporting

confidence: 64%

Modeling the binding of fulvic acid by goethite: the speciation of adsorbed FA molecules

Filius

Meeussen²,

Lumsdon³

et al. 2003

Geochimica et Cosmochimica Acta

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Section: Basic Charging Behavior and Fa Adsorptionsupporting

confidence: 64%

Modeling the binding of fulvic acid by goethite: the speciation of adsorbed FA molecules

Filius

Meeussen²,

Lumsdon³

et al. 2003

Geochimica et Cosmochimica Acta

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“…However, the inert electrolyte must be carefully chosen in function of the solid since specific adsorption of Cl -was mentioned on γ-alumina [41] and Cu 2 O [42]. The iep (isoelectric point determined by eletrophoretic measurements) and pzse (point of zero salt effect: common intersection point of the acid-base titrations curves at different ionic strengths) of goethite [43], haematite [44] or anatase [45] did not vary systematically as a function of the chloride concentration what is an element in favor of a non-specific adsorption, although Rietra et al [43] have shown that chloride was more able to screen the positive charge of goethite than nitrate or perchlorate, leading to a higher amount of sorbed protons and decreasing the sulfate uptake. A stronger effect of chloride on proton adsorption has been found for RuO 2 [46].…”

Section: Solutionmentioning

confidence: 99%

In situ Fourier-transform infrared spectroscopy studies of inorganic ions adsorption on metal oxides and hydroxides

Lefèvre

2004

Advances in Colloid and Interface Science

276

182

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In this work, the studies describing the use of attenuated total reflection -infrared spectroscopy to obtain information on the sorption mechanism of inorganic ions on metal oxy-hydroxides are reviewed. ATR-IR is amongst the rare techniques which allow to analyze the sorption phenomena in situ and led to several results about the speciation of sorbed anions (sulfate, carbonate, phosphate, perchlorate, ...) or ternary inorganic complexes since it is able to distinguish outer-sphere and inner-sphere complexes. The principles of this method are summarized, and the experimental protocols, the results and the limitations are detailed. The sample deposition method, initially based a paste or a concentrated suspension, have evolved towards the coating of the ATR crystal by a colloid layer, increasing the sensibility and the reproducibility of the measurements. Observed absorption frequencies of ions sorbed on metal oxy-hydroxides (goethite, hematite, alumina, silica, TiO 2 , ...) are reported to help the identification of peaks in new experimental works. This method, characterized by an in situ analysis performed with a special cell used in a widespread instrumentation (IR spectrometer), is very recent but its advantages suitable for the current problems in the sorption field should help its rapid development for the next years.

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“…In the CD-MUSIC model the structure of adsorbed ions is related to the spatial distribution of charge in the electrostatic interface of variable charge mineral and interpreted with the Pauling bond valence principle. In the interface, the allocation of charge from outersphere complexes is often assumed to be located at the outermost part of the Stern layer, as in complexes of electrolyte ions (15)(16)(17)(18). As suggested earlier (7,19) a charge attribution of approximately 0.1 or 0.2 v.u.…”

Section: Introductionmentioning

confidence: 98%