Formation of iron(III) hydroxides from homogeneous solutions
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2020, Journal of Hazardous MaterialsCorrelation of surface concentration polarization with the surface electrochemistry of a permselective Membrane: An ex situ electrical impedance spectroscopy study
2018, Journal of the Taiwan Institute of Chemical EngineersFe hydroxyphosphate precipitation and Fe(II) oxidation kinetics upon aeration of Fe(II) and phosphate-containing synthetic and natural solutions
2016, Geochimica et Cosmochimica ActaCitation Excerpt :This suggests the formation of a single type of Fe hydroxyphosphate phase at initial aqueous P/Fe ((P/Fe)ini) ratios larger than ≈0.5. A limited number of studies indicate that P-rich precipitates with molar P/Fe ratio of 0.5–0.6 can form in the beginning of Fe(II) oxidation even when the (P/Fe)ini is less than 0.5 (Einsele, 1934; Tessenow, 1974; Deng, 1997; Gunnars et al., 2002; Voegelin et al., 2013). As a consequence, the P/Fe ratio in the solution progressively decreases when precipitates form which are relatively enriched in P. By using TEM and XAS, Voegelin et al. (2013) showed that, in solutions with (P/Fe)ini less than 0.5, early formation of amorphous Fe hydroxyphosphates is followed by the formation of short-range ordered ferrihydrite-type precipitates in silicate-containing solutions or poorly-crystalline lepidocrocite in silicate-free solutions when the solution becomes depleted in PO4.
Precipitation pathways for ferrihydrite formation in acidic solutions
2016, Geochimica et Cosmochimica ActaInsights into solar photo-Fenton reaction parameters in the oxidation of a sanitary landfill leachate at lab-scale
2015, Journal of Environmental ManagementComposition and structure of Fe(III)-precipitates formed by Fe(II) oxidation in water at near-neutral pH: Interdependent effects of phosphate, silicate and Ca
2015, Geochimica et Cosmochimica ActaCitation Excerpt :Amorphous (Ca-)Fe(III)-phosphates did not only form at (P/Fe)init > (P/Fe)crit but were also the first phase precipitating at lower (P/Fe)init ratios (except the phosphate-free treatment). In previous studies, the initial precipitation of (Ca-)Fe(III)-phosphate during Fe(II) oxidation was inferred from changes in dissolved Fe(II) and phosphate concentrations (Einsele, 1938; Tessenow, 1974; Deng, 1997; Gunnars et al., 2002; Voegelin et al., 2013; van Genuchten et al., 2014a). In this study, we did not monitor the changes in solution and precipitate composition or in precipitate structure over time, but the changes in suspension color (Fig. 1) confirmed the initial formation of (Ca-)Fe(III)-phosphate precipitates.
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