Interaction of silicic acid with goethite

Hiemstra, Tjisse; Barnett, Mark O.; Riemsdijk, W.H. van

doi:10.1016/j.jcis.2007.01.065

Cited by 180 publications

(187 citation statements)

References 60 publications

Supporting

Mentioning

167

Contrasting

Unclassified

Order By: Relevance

“…Therefore, at high pH and low surface concentration, the SiO(OH) − 3 species in solution should be sorbed onto magnetite although the magnetite surface at this pH is negatively charged resulting in a bi-dentate complexe, (≡FeO) 2 -Si(OH)OX, whilst at lower pH oligomeric surface species should be formed. The latter species corresponds to the increase in intensity of the infrared band observed at ∼1020 cm −1 , an assignment that is supported by thermodynamic modelling [21]. is the most intense band in the pH range studied.…”

Section: Surface Complexation Of Silicate On Magnetitesupporting

confidence: 69%

“…A considerable increase in the adsorption of silicate occurred from pH 11 to 9, whereas a decrease in pH from 9 to 7 only contributed a minor change in spectral intensity. It is well known that silicate sorption onto iron oxyhydroxides has a maximum at a pH value around 9 [8,10,21,22], but this is not reflected in our spectra. The observed sorption should already have passed its maximum when reaching pH 7.…”

Section: The Effect Of Ph On Sorption and Desorption Of The Silicatesmentioning

confidence: 65%

“…Other authors [10,19,20] have used but also developed this ligand-exchange model. Very recently, Hiemstra et al modelled silicate sorption onto goethite from 1.0 × 10 −4 to 1.0 × 10 −3 mol L −1 solutions using a modified surface complex model (CD-MUSIC distribution model) [21]. They concluded that a bidentate surface complex (≡Fe 2 O 2 Si(OH) 2 ) is favoured at low surface loading while at high surface loading polymerized species are more likely.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

167

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: Surface Complexation Of Silicate On Magnetitesupporting

confidence: 69%

Section: The Effect Of Ph On Sorption and Desorption Of The Silicatesmentioning

confidence: 65%

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

167

105

View full text Add to dashboard Cite

show abstract

“…During the past decades, the study of interaction between silicate and iron oxides as well as other minerals was mainly carried out by batch adsorption experiments, modeling methods, and ex situ spectroscopy techniques [1,3,7,[10][11][12]. However, there are very few if any in situ studies on the sorption of silicate species onto magnetite showing the formation of surface complexes with time.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of silicate sorption on magnetite and maghemite: An in situ ATR-FTIR study

Yang

Roonasi

Jolsterå

et al. 2009

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

a b s t r a c tAttenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy was used to monitor the in situ sorption of sodium metasilicate from aqueous solution onto synthesized magnetite and maghemite particles in the pH range of 10.8-7.0 using silicate concentrations between 0.1 mM and 5 mM. The spectral data showed that both pH and silicate concentration had great influence on the interfacial reaction between soluble silicate and the iron oxide surfaces, regarding the amount adsorbed per unit mass of iron oxide and the surface species formed. A pH dependent sorption of silicate on iron oxides was observed, implying that a maximum sorption took place in the pH range of 9.5-7.0. All experiments showed a fast initial increase in the absorption intensity followed by a slower sorption stage which was strongly dependent on the concentration of silicate in solution and the pH value. The amount of sorption onto magnetite was 3-5 times larger than onto maghemite, but there was no significant difference in the line shape of corresponding absorption bands. At pH 8.5 and low concentration (≤0.1 mM), the silicate monomers dominate in solution and on the iron oxide surface also monomeric species were dominating as evident from the infrared band at 950 cm −1 . However, at higher concentration (0.4-5.0 mM), the dominating absorption band at about 1000 cm −1 shifted to higher frequency during the sorption indicating that oligomeric surface silicate species were formed on the iron oxide surface. Desorption of silicate from the surface of the iron oxides was easier to accomplish at low silicate concentration, whilst the highest concentration showed a comparatively low relative amount of desorbed silicate, suggesting that polymerized species had a stronger affinity for the iron oxide surface as compared to monomeric species.

show abstract

“…It is possible, for example, to precipitate silica in the presence of metal ions such as Fe(III) and Al(III) [9], but the resulting precipitate is gel-like and difficult to dewater [10]. It is also possible to adsorb the silica onto metal oxides such as alumina, goethite and hematite [11,12,13]. If these are colloidal, however, this too can lead to sludge management problems.…”

Section: Introductionmentioning

confidence: 99%

Silica scale mitigation for high recovery reverse osmosis of groundwater for a mining process

Sartipy

Milne

Taylor³

et al. 2014

Desalination

View full text Add to dashboard Cite

Abstract:The feasibility of silica removal in RO treatment of groundwater from a Western Australian mining and processing operation to prevent scaling and enhance water recovery was investigated. This study has shown that it is possible to decrease the silica concentration in RO concentrate to levels that would allow an overall water recovery of 90% to 95% using 10 g/L of regenerable activated alumina adsorbent. Regeneration of the adsorbent using 2% NaOH was found to be effective for at least three regeneration cycles. A preliminary costing of the high water recovery RO process using silica removal by adsorption indicated product water (permeate) costs of $5.6/kL and savings due to a reduction in brine volume from the current 40% of feed volume to 5-10% of feed volume. It also allows better utilization of a scarce groundwater resource, allowing the production of up to 1.6 times more low salt water from a given volume of groundwater. These results warrant larger scale investigation of silica removal and adsorbent regeneration for high recovery RO processing for mining operations, and application of silica removal to RO treatment of other silica laden waters such as coal seam gas produced water.

show abstract

Interaction of silicic acid with goethite

Cited by 180 publications

References 60 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

Kinetics of silicate sorption on magnetite and maghemite: An in situ ATR-FTIR study

Silica scale mitigation for high recovery reverse osmosis of groundwater for a mining process

Contact Info

Product

Resources

About