Catalytic effects of photogenerated Fe(II) on the ligand-controlled dissolution of Iron(hydr)oxides by EDTA and DFOB

Biswakarma, Jagannath; Kang, Kyounglim; Schenkeveld, Walter D. C.; Kraemer, Stephan M.; Hering, Janet G.; Hug, Stephan J.

doi:10.1016/j.chemosphere.2020.128188

Cited by 4 publications

(3 citation statements)

References 53 publications

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“…The maximum wavelength of excitation light for various iron (hydr)oxides follows the order: ferrihydrite > hematite > lepidocrocite > goethite (Figure ). Besides, the photoreduction of Fe(III) has positive correlation with the intensity of incident light, one example is the photoreductive dissolution rate of lepidocrocite increases with light intensity. ,, …”

Section: The Factors Affecting Photoreductive Dissolution Of Iron (Hy...mentioning

confidence: 99%

“…At pH < 5 and in the presence of desferrioxamine B, the proton- and ligand-promoted dissolution are both accelerated; while the presence of aerobactin only accelerates the ligand-promoted dissolution because of its high adsorption capacity. , Borowski et al showed that oxalate can accelerate the photoreductive dissolution of lepidocrocite and the formation of bidentate mononuclear structure complexes is the main structure for electron transfer (as mentioned in section ). Other studied NOM, such as ethylene diamine tetraacetic acid and fulvic acid, can also accelerate the reductive dissolution of lepidocrocite by LMCT and photogenerated O 2 •− . , …”

Section: Photoreductive Dissolution Of Various Iron (Hydr)oxidesmentioning

confidence: 99%

“…Besides, the photoreduction of Fe(III) has positive correlation with the intensity of incident light, one example is the photoreductive dissolution rate of lepidocrocite increases with light intensity. 78,120,149 Solution pH alters proton-promoted dissolution and electron transfer process in photoreduction of iron (hydr)oxides, making it a key factor in determining their photoreductive dissolution. First, pH controls the proton-promoted dissolution.…”

Section: Mechanisms Of Photoreductivementioning

confidence: 99%

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Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

Liu

Zhu

et al. 2022

ACS Earth Space Chem.

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Iron (hydr)oxides are the most abundant metal oxides, which are widespread on Earth’s surface in the major form of micro/nanoparticles. Dissolution of iron (hydr)oxides significantly controls their compositions on Earth’s surface and is a critical step for the global Fe cycling. Photoreductive dissolution of iron (hydr)oxides is recognized as one of the most important process for generating Fe2+ in surface water and is also a common pathway for transforming solar energy into chemical energy. This review article dissects the main characteristics of photoreductive dissolution of iron (hydr)oxides and discusses its geochemical and environmental significance. We categorize the mechanisms for photoreduction of iron (hydr)oxides into three types: reduction by intrinsic photogenerated electrons, reduction by ligand to metal electron transfer (LMCT), and reduction by direct injection of exogenous photoelectrons. The efficiency of photoreductive dissolution is constrained by both the structure of iron (hydr)oxides (e.g., crystal structure and particle size) and environmental conditions (e.g., light, pH, and concurrent chemicals). Therefore, different iron (hydr)oxides may exhibit quite distinctive photoreductive dissolution characteristics because of their unique crystal structures and physicochemical properties. Iron (hydr)oxides with low crystallinity (e.g., ferrihydrite, lepidocrocite) are subject to direct photoreductive dissolution, while those with high crystallinity (e.g., goethite, hematite) generally need ligands to proceed with photoreductive dissolution. The photoreductive dissolution of iron (hydr)oxides is involved in many important geochemical and environmental processes, such as the Fe availability to primary producers, the generation of reactive oxygen species, the transportation and fate of contaminants, and the phase transformation of iron (hydr)oxides. Given the ubiquitous occurrence of photoreductive dissolution of iron (hydr)oxides, this review will advance our understanding of the role of this process in Earth’s surface environments.

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Section: The Factors Affecting Photoreductive Dissolution Of Iron (Hy...mentioning

confidence: 99%

Section: Photoreductive Dissolution Of Various Iron (Hydr)oxidesmentioning

confidence: 99%

Section: Mechanisms Of Photoreductivementioning

confidence: 99%

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Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

Liu

Zhu

et al. 2022

ACS Earth Space Chem.

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The impact of alternate wetting and drying and continuous flooding on antimony speciation and uptake in a soil-rice system

Cui

Ata-Ul-Karim

et al. 2022

Chemosphere

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Redox Dynamic Interactions of Arsenic(III) with Green Rust Sulfate in the Presence of Citrate

Biswakarma,

Matthews,

Byrne

2024

Environ. Sci. Technol. Lett.

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Arsenic is a global pollutant. Recent studies found that Fe(II) can oxidize As(III), but the extent of oxidation with mixed-valent iron minerals and the mechanisms involved are unknown. In this study, we investigated whether As(III) can be oxidized under reducing conditions using green rust sulfate (GR-SO 4 ), an Fe mineral containing both Fe(II) and Fe(III). Batch sorption experiments showed that GR-SO 4 (1 g L −1 ) effectively sorbs environmentally relevant concentrations of As(III) (50−500 μg L −1 ) under anoxic, neutral pH conditions with and without citrate (50 μM). X-ray absorption near-edge structure spectroscopy analysis at the As K-edge demonstrated that approximately 76% of As(III) was oxidized to As(V) by GR-SO 4 . Complete oxidation of As(III) was observed in the presence of citrate. As(III) oxidation can be linked to the phase transformation of GR-SO 4 to goethite, resulting in new reactive Fe(III) species that plausibly drive oxidation. Citrate enhanced this process by stabilizing Fe on the mixed GR-SO 4 /goethite surface, preventing its reduction back to Fe(II) and facilitating further As(III) oxidation without significant Fe loss to the solution. This study highlights the cryptic As(III) oxidation that occurs under reducing conditions, providing new insights into the cycling of arsenic in mixed phases of iron-rich, anoxic environments.

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Catalytic effects of photogenerated Fe(II) on the ligand-controlled dissolution of Iron(hydr)oxides by EDTA and DFOB

Cited by 4 publications

References 53 publications

Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

Photoreductive Dissolution of Iron (Hydr)oxides and Its Geochemical Significance

The impact of alternate wetting and drying and continuous flooding on antimony speciation and uptake in a soil-rice system

Redox Dynamic Interactions of Arsenic(III) with Green Rust Sulfate in the Presence of Citrate

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