Temperature effect on the zeta potential and fluoride adsorption at the α-Al2O3/aqueous solution interface

Valdivieso, A. López; Bahena, J. L. Reyes; Song, Si Young; Urbina, R. Herrera

doi:10.1016/j.jcis.2005.11.060

Cited by 164 publications

(90 citation statements)

References 15 publications

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“…The dynamic method, employing a shorter contact time, appeared to be more convenient for minimizing the effects of aggregation and of CO 2 dissolution. However, this conclusion cannot be generalized, since for other oxide particles studied by a static method, regular ζ vs pH curves were obtained (see for instance [32]). …”

Section: Measurement Of Zeta Potential-static Methodsmentioning

confidence: 98%

Comparison between batch and column experiments to determine the surface charge properties of rutile TiO2 powder

Švecová

Cremel

Sirguey

et al. 2008

Journal of Colloid and Interface Science

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Section: Measurement Of Zeta Potential-static Methodsmentioning

confidence: 98%

Comparison between batch and column experiments to determine the surface charge properties of rutile TiO2 powder

Švecová

Cremel

Sirguey

et al. 2008

Journal of Colloid and Interface Science

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“…Some studies reported the release of OH − during the adsorption of F − , which caused an increase in pH [29,34,36]. However, this did not occur in the present study with wheat straw, with a slight acidification of the environment and variable reduction of DOC levels taking place in the solution with increasing concentrations of added F. The absence of pH increases can be explained by F − sorption taking place by means of H bonds or van der Waals forces, without the release of OH − groups [35,37,38]. Another possibility is the formation of precipitates including F − and different elements present in wheat straw, resulting in complexes such as CaF 2 or TiF [39].…”

Section: Data Analysesmentioning

confidence: 51%

“…The same was observed by Fernández-Pazos et al [25] studying chromium sorption and by Seco-Reigosa et al [11] studying arsenic sorption. This behavior may occur when the samples adsorb Cr(VI) and As(V) predominantly by electrostatic attraction between the adsorbent surface and the anionic species of these elements, releasing OH − and causing an increase in pH [10,34,35]. In the present study, some pH increases took place even when 3 and 6 mmol L −1 As(V) were added (with no As(V) sorption taking place on straw for these added concentrations), suggesting that additional causes could contribute to raising pH.…”

Section: Data Analysesmentioning

confidence: 99%

“…The layouts of Ni, F, and Cr show a linear trend, without signs of stabilization. concentrations of added F. The absence of pH increases can be explained by F − sorption taking place by means of H bonds or van der Waals forces, without the release of OH − groups [35,37,38]. Another possibility is the formation of precipitates including F − and different elements present in wheat straw, resulting in complexes such as CaF2 or TiF [39].…”

Section: As(v) Cr(vi) F − and Ni 2+ Sorption Curvesmentioning

confidence: 99%

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Wheat Straw as a Bio-Sorbent for Arsenate, Chromate, Fluoride, and Nickel

Romar-Gasalla

Coelho

Nóvoa-Muñoz

et al. 2017

Water

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Abstract:Batch-type experiments were used to study As(V), Cr(VI), F − , and Ni 2+ sorption/desorption on wheat straw. For the lowest concentration added (0.5 mmol·L −1 ), the sorption sequence was F − > Ni 2+ > Cr(VI) >> As(V) (93%, 61%, 29%, 0.3%), but changed to Ni 2+ > F − > Cr(VI) >> As(V) when 3.0 and 6.0 mmol·L −1 were added (with 65%, 54%, 25%, 0%, and 68%, 52%, 27%, 0% sorption, respectively). Overall, As(V) showed the lowest sorption, whereas it was 25-37% for Cr(VI), 61-68% for Ni 2+ , and 52-93% for F − . For As(V), pH in the equilibrium solution was always above the pH of the point of zero charge (pH PZC ) for wheat straw, decreasing sorption efficiency. For Cr(VI), pH was below pH PZC , but not enough to reach high sorption. For F − , pH in the equilibrium was above pH PZC , which could reduce sorption. For Ni 2+ , pH in the equilibrium was always below pH PZC , which made sorption difficult. The satisfactory fitting of Cr(VI), F − , and Ni 2+ data to the Freundlich model suggests multilayer-type adsorption. Desorption was high for F − , whereas Ni 2+ showed the lowest desorption. This research could be especially relevant when focusing on the use of wheat straw as a bio-sorbent, and in cases where straw mulching is used.

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“…Adsorption on positively charged sites via electrostatic force, forming outer-sphere complexes, may also contribute partly to F and P retention (Valdivieso et al 2006). In F-P coexisting system, the increases in amounts of F and P sorption with decreasing solution pH could be attributed partly to an increase in positively charged sites due to protonation.…”

Section: Effects Of Initial Ph On Sorption Of Fluoride and Phosphatementioning

confidence: 99%

Investigation on Co-sorption and Desorption of Fluoride and Phosphate in a Red Soil of China

Zhu

Ding

Jiang

et al. 2007

Water Air Soil Pollut

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Agricultural soils high in both fluoride (F) and phosphate (P) are common due to long-term accumulation of F from multi-sources and extensive application of phosphate fertilizers. Iron (Fe) and aluminum (Al) (hydro)oxides in acidic soils serve as main geochemical sinks of both P and F, influencing their transport and bioavailability. Though sorption of P and F in their single-ion system has been extensively investigated, studies on co-sorption of F and P on soils are very limited. In this study, the batch technique was used to investigate mutual effects of F and P on their co-sorption/desorption in an acidic red soil with high contents of Fe and Al (hydro)oxides. Results indicate that, in F-P coexisting system, a decrease in pH enhances the sorption of both F and P. An increase in F concentration suppresses P sorption due to competitive effect. However, F sorption can be improved in the presence of P due to surface precipitation of (Al,Fe)-F-P. Sorption of F and P follows both the Langmuir and Freundlich isotherms. Different orders of F and P addition into the soil have no appreciable effect on P sorption, but exert significant impact on F sorption. The presence of F has no measurable effect on P desorption, while the stability of F in the presence of P can be significantly diminished in comparison with that in the absence of P, which would lead to an improvement of F mobility.

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Temperature effect on the zeta potential and fluoride adsorption at the α-Al2O3/aqueous solution interface

Cited by 164 publications

References 15 publications

Comparison between batch and column experiments to determine the surface charge properties of rutile TiO2 powder

Comparison between batch and column experiments to determine the surface charge properties of rutile TiO2 powder

Wheat Straw as a Bio-Sorbent for Arsenate, Chromate, Fluoride, and Nickel

Investigation on Co-sorption and Desorption of Fluoride and Phosphate in a Red Soil of China

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