A Quantitative Modeling of Co-precipitation Phenomena in Wastewater Containing Dilute Anions with Ferrihydrite using a Surface Complexation Model

Tokoro, Chiharu; Yatsugi, Yohei; Sasaki, Hiroshi; Owada, Shigeki

doi:10.4144/rpsj.55.3

Cited by 17 publications

(6 citation statements)

References 17 publications

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“…The DLM is one of the most general and simple surface complexation models and can be used to estimate surface complexation within a set of quasi thermodynamic constants (24). In addition, it is well-known that Dzombak and Morel's model can be used to describe the adsorption of As(V) to HFO (25). The solid lines in Figures 1 and 2 show the curves generated using the DLM with Dzombak and Morel's parameters.…”

Section: Resultsmentioning

confidence: 99%

Sorption Mechanisms of Arsenate during Coprecipitation with Ferrihydrite in Aqueous Solution

Tokoro

Yatsugi

Koga

et al. 2009

Environ. Sci. Technol.

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106

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Dilute arsenate (As(V)) coprecipitation by ferrihydrite was investigated to determine if treatment of acid mine drainage containing dilute As(V) using coprecipitation is feasible. The sorption density obtained at pH 5 and 7 was nearly identical when As(V) was coprecipitated with ferrihydrite, while it was higher at pH 5 when As(V) was adsorbed on the ferrihydrite. The high sorption density of As(V) to ferrihydrite in coprecipitation with 1-h reaction time suggested that coprecipitation occurs via both adsorption and precipitation. Furthermore, the relationship between residual As(V) and sorption density revealed a BET-type isotherm, with a transition point from a low residual As(V) concentration to a high residual As(V) concentration being observed for all initial As(V) concentrations between 0.15 and 0.44 mmol/dm(3) when the initial molar ratio was 0.56 at pH 5 and 7. X-ray diffraction and the zeta potential revealed that the transition point from surface complexation to precipitation was obtained when the initial As/Fe ratio was 0.4 or 0.5. When dilute As(V) was coprecipitated with ferrihydrite at pH 5 and 7, it was primarily adsorbed as a surface complex when the initial molar ratio was As/Fe < 0.4, while a ferric arsenate and surface complex was formed when this ratio was >or= 0.4.

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Section: Resultsmentioning

confidence: 99%

Sorption Mechanisms of Arsenate during Coprecipitation with Ferrihydrite in Aqueous Solution

Tokoro

Yatsugi

Koga

et al. 2009

Environ. Sci. Technol.

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106

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“…In up-scaling results from well-thought-through experiments for the design of reactive barriers (Noubactep and Caré, 2010b;Noubactep and Caré, 2010c), available models for co-precipitation phenomena will be very useful (e.g. Komnitsas et al, 2006;Tokoro et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Review: The fundamental mechanism of aqueous contaminant removal by metallic iron

Noubactep¹

2010

WSA

138

115

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Contaminant co-precipitation with continuously generated and transformed iron corrosion products has received relatively little attention in comparison to other possible removal mechanisms (adsorption, oxidation, precipitation) in Fe 0 /H 2 O systems at near neutral pH values. A primary reason for this is that the use of elemental iron (Fe 0 ) in environmental remediation is based on the thermodynamic-founded premise that reducible contaminants are potentially reduced while Fe 0 is oxidised. However, co-precipitation portends to be of fundamental importance for the process of contaminant removal in Fe 0 /H 2 O systems, as the successful removal of bacteria, viruses and non reducible organic (e.g. methylene blue, triazoles) and inorganic (e.g. Zn) compounds has been reported. This later consideration has led to a search for the reasons why the importance of co-precipitation has almost been overlooked for more than a decade. Three major reasons have been identified: the improper consideration of the huge literature of iron corrosion by pioneer works, yielding to propagation of misconceptions in the iron technology literature; the improper consideration of available results from other branches of environmental science (e.g. CO 2 corrosion, electrocoagulation using Fe 0 electrodes, Fe or Mn geochemistry); and the use of inappropriate experimental procedures (in particular, mixing operations). The present paper demonstrates that contaminant co-precipitation with iron corrosion products is the fundamental mechanism of contaminant removal in Fe 0 /H 2 O systems. Therefore, the 'iron technology' as a whole is to be revisited as the 'know-why' of contaminant removal is yet to be properly addressed.

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“…10 When Fe(III) ions are hydrolyzed, Cr(VI) and Fe(III) will form co-precipitates of ferrihydrite and Cr(VI) (Fh−Cr). 10,11 Furthermore, natural organic matter co-exists with ferrihydrite and affects the interaction between some pollutants and ferrihydrite. 12 Phytic acid (PA) is a natural organic matter and the most common organophosphorus species in the soil, which is mainly synthesized by plants.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

Sun

Chrysikopoulos

2022

ACS EST Water

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Understanding the influences of ferrihydrite conversion and co-existing substances on the migration of Cr(VI) in the co-precipitates of ferrihydrite and Cr(VI) (Fh–Cr) is helpful in predicting the migration path of Cr(VI). This work studied the influence of phytic acid on the immobilization of Cr(VI) in ferrihydrite and the migration of Cr(VI) in the presence of phytic acid and Mn(II). The results revealed that phytic acid hindered the retention of Cr(VI) in ferrihydrite and the conversion of ferrihydrite to goethite and hematite. Phytic acid inhibited the formation of hematite by inhibiting ferrihydrite particle aggregation, and the combination of phytic acid and iron ions prevented the formation of goethite. Although phytic acid significantly retarded the conversion of Fh–Cr, it did not hinder the migration of Cr(VI). Besides, the presence of Mn(II) eliminated the negative effect of phytic acid on the immobilization of Cr(VI) in ferrihydrite. The results of this study were helpful in understanding the interaction among ferrihydrite, phytic acid, Mn(II), and the migration path of Cr(VI) during the conversion.

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A Quantitative Modeling of Co-precipitation Phenomena in Wastewater Containing Dilute Anions with Ferrihydrite using a Surface Complexation Model

Cited by 17 publications

References 17 publications

Sorption Mechanisms of Arsenate during Coprecipitation with Ferrihydrite in Aqueous Solution

Sorption Mechanisms of Arsenate during Coprecipitation with Ferrihydrite in Aqueous Solution

Review: The fundamental mechanism of aqueous contaminant removal by metallic iron

Effect of Mn(II) and Phytic Acid on Cr(VI) in the Ferrihydrite-Cr(VI) Co-precipitates: Implication for the Migration Behavior of Cr(VI)

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