Photodissolution of iron oxides: I. Maghemite in EDTA solutions
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Catalytic effects of photogenerated Fe(II) on the ligand-controlled dissolution of Iron(hydr)oxides by EDTA and DFOB
2021, ChemosphereCitation Excerpt :In previous studies, dissolved Fe(II) and total dissolved Fe were quantified while mineral suspensions were continuously exposed to solar or UV illumination (Borer et al., 2005, 2007, Borer et al., 2009a; Borer and Hug, 2014). Rates of photoreductive dissolution in the presence of ligands during illumination were reported to be higher than ligand-controlled dissolution rates in the dark, and explained by faster detachment of Fe(II) by ligands than of Fe(III) (Litter and Blesa, 1988; Goldberg et al., 1993; Karametaxas et al., 1995; Sulzberger and Laubscher, 1995a). However, the possibility that photogenerated Fe(II) also accelerates the detachment of Fe(III) by ligands and that this effect could persist even after illumination ceased was not investigated.
Photodegradation of bisphenol AF in montmorillonite dispersions: Kinetics and mechanism study
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2009, Journal of Cultural HeritagePhotocatalytic degradation of organics in water in the presence of iron oxides: Influence of carboxylic acids
2009, Applied Catalysis B: EnvironmentalCitation Excerpt :They found that dissolution rate order was magnetite > maghemite ≫ hematite demonstrating the low dissolution ability of the corundum-structure oxides (hematite) compared to that of the spinel-structured oxides and attributing this to higher electron mobility in the spinel structure. Light-induced dissolution of iron oxides has been subject of many studies [26–35]. This process can be interpreted as a reductive dissolution one and generally involves these steps: (1) Photoexcitation followed by charge transfer resulting in the reduction of surface Fe(III) to Fe(II). (
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