Surface Complexation Modeling and FTIR Study of Carbonate Adsorption to Goethite

Villalobos, Mario; Leckie, James O.

doi:10.1006/jcis.2000.7341

Cited by 176 publications

(181 citation statements)

References 53 publications

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“…Two methods were used to bring particulate matter into contact with the crystal: (1) spreading a concentrated suspension [4,25,31] or a paste [27,29,33,34,36] on the crystal or (2) coating by colloidal particles to form a film stable toward stirring or flowing of the solution in direct contact. [11,12,16,[23][24][25][26]28,32].…”

Section: Cells and Methods Of Solid Depositionmentioning

confidence: 99%

“…This water content is required to explain the possibility of using ATR spectroscopy on layers of solids whose refractive indexes (RI) are greater than those of ZnSe (2.4), as hematite (RI ~ [4,11,12,[23][24][25][26][27][28][29][30][31][32], ZnSe was used, the other materials were AMTIR (Amorphous Material which Transmits Infrared Radiation) [33,34],Ge [12,27] and diamond [35]. A summary of the properties of these materials can be seen in Table 2.…”

Section: Attenuated Total Reflection Spectroscopy Principlesmentioning

confidence: 99%

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

Lefèvre

2004

Advances in Colloid and Interface Science

278

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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Section: Cells and Methods Of Solid Depositionmentioning

confidence: 99%

Section: Attenuated Total Reflection Spectroscopy Principlesmentioning

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

278

182

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“…Following the procedures developed to evaluate the influence of carbonate co-adsorption in the adsorption of various chemical species in the presence of goethite nano-particles, CO 2 exclusion adsorption experiments were conducted based on various solution pH conditions (Villalobos and Leckie, 2001;Kanematsu et al, 2011). The adsorption under both closed (fixed total CO 2 ) and open (fixed PCO 2 ) conditions was conducted to assess the potential influence of dissolved bicarbonate and carbonate on phosphate adsorption onto HFO.…”

Section: Hfo Surface Area and X-ray Diffraction (Xrd) Measurementmentioning

confidence: 99%

Surface-complexation modelling for describing adsorption of phosphate on hydrous ferric oxide surface

Mengistu

Tessema

Demlie

et al. 2015

WSA

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Adsorption of dissolved phosphate onto synthetic hydrous ferric oxide (HFO) was measured in the laboratory as a function of pH, ionic strength, and phosphate relative concentration. Experimental data were used to constrain optimal values of surface complexation reactions using a geochemical modeling code JCHESS according to the diffuse layer model. The results provide a consistent set of model equilibrium constant (log K) values at 25° C and 100 KPa for the following reactions: These results differ significantly from previously-published estimates of log K 2 int and log K 3 int [1][2][3], and provide a more accurate fit to experimental measurements over a broad range of pH (3-12), ionic strength (0.001-0.1 mol/ℓ) and total relative phosphate concentration (12-500 µmol phosphate/g HFO). The results provide a close fit to the experimental data within a wide range of conditions, and should be adopted in modelling the chemical speciation of phosphate in natural systems containing HFO as a predominant adsorbing material.

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“…It is predominant in younger sedimentary deposits, giving the rocks a yellow color (Prasad et al, 2006). Goethite particles show high specific surface areas and strong affinities for surface binding of oxyanions and heavy metals (Fendorf et al, 1997;Villalobos and Leckie, 2001;Antelo et al, 2005;Granados-Correa et al, 2011;Perelomov et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Laboratory synthesis of goethite and ferrihydrite of controlled particle sizes

Villacís-García¹,

Ugalde-Arzate²,

Vaca-Escobar³

et al. 2015

BSGM

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Iron oxyhydroxides, such as goethite and ferrihydrite, are highly abundant and ubiquitous minerals in geochemical environments. Because of their small particle sizes, their surface reactivity is high towards adsorption of anions and cations of environmental relevance. For this reason these minerals are extensively studied in environmental geochemistry, and also are very important for environmental and industrial applications. In the present work, we report the synthesis and characterization of goethite and ferrihydrite of controlled particle sizes. It has been shown that surface reactivity of these minerals is highly dependent on crystal sizes, even after normalizing by specific surface area. In order to investigate the reasons for this changing reactivity it is necessary to work with reproducible particle sizes of these minerals. We investigated here the experimental conditions to synthesize goethite samples of four different specific surface areas: ca. 40, 60, 80 and 100 m 2 g -1 , through the controlled speed of hydroxide addition during hydrolysis of acid Fe(III) solutions. In the case of 2-line ferrihydrite, samples with two different particle sizes were prepared by changing the aging time under the pH conditions of synthesis (pH = 7.5). The synthesized minerals were identified and characterized by: X-ray diffraction, N 2 adsorption BET specific surface area, transmission electron microscopy, attenuated total reflectance Fourier transform infrared spectroscopy, and maximum Cr(VI) adsorption.Keywords: synthesis, iron oxides, specific surface area, goethite, ferrihydrite, particle size. Resumen

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Surface Complexation Modeling and FTIR Study of Carbonate Adsorption to Goethite

Cited by 176 publications

References 53 publications

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

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

Surface-complexation modelling for describing adsorption of phosphate on hydrous ferric oxide surface

Laboratory synthesis of goethite and ferrihydrite of controlled particle sizes

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