In situ Fourier Transform Infrared Spectroscopic Evidence for the Formation of Several Different Surface Complexes of Oxalate on TiO2 in the Aqueous Phase

Hug, Stephan J.; Sulzberger, Barbara

doi:10.1021/la00022a036

Cited by 299 publications

(338 citation statements)

References 0 publications

Supporting

Mentioning

300

Contrasting

Unclassified

Order By: Relevance

“…In situ ATR infrared measurements were performed using the flow cell technique described elsewhere [23,24,26]. The pH of the reaction solutions were monitored by a combined pH electrode and adjusted when needed.…”

Section: Spectra Of Sodium Silicate In Solution and On Magnetitementioning

confidence: 99%

“…Their results indicated the formation of two types of monodentate surface complexes, ≡FeH 3 SiO 4 and ≡FeH 2 SiO − 4 . Attenuated total reflection Fourier transformed infrared (ATR-FTIR) spectroscopy has been proven to be a powerful in situ technique to study solid-liquid interface reactions, where various inorganic anions (such as arsenate, sulfate, phosphate) and organic compounds interacts with metal oxides and minerals [23][24][25][26]. Although there are some IR, XPS and EXAFS studies on the interaction of silicate with iron oxides or polymers [27,28], no in situ spectroscopy study monitoring the sorption of silicate from dilute solutions, viz.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

166

105

View full text Add to dashboard Cite

The sorption of sodium silicate by synthetic magnetite (Fe 3 O 4 ) at different pH conditions (pH 7-11) and initial silicate concentrations (1 × 10 −3 and 10 × 10 −3 mol L −1 ) was studied using in situ attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy. The analysis of infrared spectra of sodium silicate in solution as well as adsorbed on magnetite nano-particles clearly showed the evolution of different silicate species depending on pH and silica concentration. The silicate concentration studied (10 × 10 −3 mol L −1 ) contained polymeric or condensed silicate species at lower pH as well as monomers at high pH, as evident from infrared spectra. Condensation of monomers resulted in an increased intensity of absorptions in the high frequency part (>1050 cm −1 ) of the spectral region, which contains information about both silicate in solution and sorbed silicate viz. 1300 cm −1 -850 cm −1 . In the pH range studied, infrared spectra of sorbed silicate and sorbed silicate during desorption both indicated the presence of different types of surface complexes at the magnetite surface. The sorption mechanism proposed is in accordance with a ligand exchange reaction where both monodentate and bidentate complexes could exist at low surface loading level, the relative proportion of the complexes being due to both pH and concentration in solution. Oligomerization occurred on the magnetite surface at higher surface loading.

show abstract

Section: Spectra Of Sodium Silicate In Solution and On Magnetitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

Yang

Roonasi

Holmgren

2008

Journal of Colloid and Interface Science

166

105

View full text Add to dashboard Cite

show abstract

“…For example, to develop a reasonable model for the equilibria essential to the development of a charged mineral surface, an experimental method for characterizing the essential surface chemical entities and their relative abundances would be desired. Both direct and indirect approaches have provided a large volume of experimental data on the chemical and structural aspects of mineral-water interfaces (e.g., Hug and Sulzberger, 1994;Knipe et al, 1995;Ainsworth et al, 1998;Brown et al, 1999;Fenter et al, 2000;Pokrovsky and Schott, 2002). These approaches, involving spectroscopic and analytical chemical tools, are generally applicable to any mineral class although specimen requirements in some techniques may preclude the study of many natural materials.…”

Section: Introductionmentioning

confidence: 99%

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

Joshi

Mukhopadhyay

et al. 2006

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Cleaved surfaces of dolomite were studied using ex-situ X-ray photoelectron spectroscopy (XPS) following exposure of the surfaces to various experimental conditions. Dolomite samples exposed to air, to a highly undersaturated solution (0.1 M NaCl, pH = 9), and to solution with a supersaturation (ÀDl/kT) of 5.5 (pH = 9) were investigated with semiquantitative methods of analysis to ascertain the degree of non-stoichiometry resulting at the dolomite surface from reactive conditions. It was found that the dolomite cleavage surface in undersaturated solution was not altered significantly from the stoichiometric surface termination. The composition of the cleaved surface after exposure to supersaturated solution, a surface known to have self-limiting growth characteristics under similar conditions, was found to be Ca 2+ rich (Ca x Mg 2 À x (CO 3 ) 2 , 1.7 > x > 1.3). The observations, while underscoring differences in hydration/dehydration kinetics of the two alkaline earth cations, suggest that achievement of equilibrium at dolomite-water interfaces may be subject to significant barriers from both undersaturated and supersaturated solutions.

show abstract

“…A thin anatase layer was deposited on the ZnSe ATR crystal (2.3 g m -2 and 1-3 µm thick) [7]. Prior to starting the irradiation experiments, spectra of adsorption of H2O and D2O on the TiO2 material were monitored in the dark.…”

Section: Atr-ftir Measurementmentioning

confidence: 99%

In Situ ATR-FTIR Investigation of the Effects of H₂O and D₂O Adsorption on the TiO₂Surface

et al. 2017

View full text Add to dashboard Cite

We have investigated the behavior of H2O and D2O adsorption on TiO2 surfaces in the dark and under UV irradiation using insitu ATR-FTIR spectroscopy. The influence of an electron scavenger (oxygen) and a hole scavenger (ethanol) on the hydroxyl group and/or hydration water behavior on the TiO2 surface were also investigated. Adsorption of H2O-D2O mixtures revealed an isotopic exchange reaction occurring in the dark onto the surface of the TiO2 material. Under UV(A) irradiation, the quanitity of both OH and OD groups was found to be increased by the presence of molecular oxygen. On the other hand, the ATR-FTIR study of the ethanol adsorption in H2O and D2O revealed a stronger adsorption capacity for ethanol compared to both H2O and D2O resulting in molecular and dissociative adsorption of ethanol on the TiO2 surface. When the system was subsequently illuminated with UV(A) light, the surface becomes enriched with adsorbed water. Different possible mechanisms and hypotheses are discussed in terms of the effect of UV irradiation on the TiO2 particle network for the photocatalytic reaction and photoinduced hydrophilicity.

show abstract

In situ Fourier Transform Infrared Spectroscopic Evidence for the Formation of Several Different Surface Complexes of Oxalate on TiO2 in the Aqueous Phase

Cited by 299 publications

References 0 publications

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

In Situ ATR-FTIR Investigation of the Effects of H₂O and D₂O Adsorption on the TiO₂Surface

Contact Info

Product

Resources

About

In situ Fourier Transform Infrared Spectroscopic Evidence for the Formation of Several Different Surface Complexes of Oxalate on TiO2 in the Aqueous Phase

Cited by 299 publications

References 0 publications

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

A study of sodium silicate in aqueous solution and sorbed by synthetic magnetite using in situ ATR-FTIR spectroscopy

X-ray photoelectron spectroscopic studies of dolomite surfaces exposed to undersaturated and supersaturated aqueous solutions

In Situ ATR-FTIR Investigation of the Effects of H2O and D2O Adsorption on the TiO2Surface

Contact Info

Product

Resources

About

In Situ ATR-FTIR Investigation of the Effects of H₂O and D₂O Adsorption on the TiO₂Surface