Fe(II)-induced transformation of iron minerals in soil ferromanganese nodules

Liu, Chengshuai; Massey, Michael S.; Latta, Drew E.; Xia, Yafei; Li, Fangbai; Gao, Ting; Hua, Jian

doi:10.1016/j.chemgeo.2020.119901

Cited by 15 publications

(6 citation statements)

References 71 publications

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“…During the photoreduction of iron (hydr)oxides, photoelectrons derived from minerals or external sources can reduce Fe(III), changing the charge distribution and decreasing the stability of the crystal, which may accelerate the transformation of iron (hydr)oxides (e.g., ferrihydrite). , In addition, dissolution is an essential step in some phase transformations among iron (hydr)oxides, such as the transformation of ferrihydrite to goethite by dissolution and recrystallization. , As the Fe(II)–O bond is more labile than the Fe(III)–O bond, the dissolution of iron (hydr)oxides can be accelerated by reduction processes and hence benefit the formation of goethite . Previous studies also suggested that aqueous Fe(II) can be the catalyst for the recrystallization of iron (hydr)oxides, such as goethite. ,,, Under UV irradiation, Schwertmannite was rapidly transformed to goethite in the presence of oxalate (2 mM) (Figure ). , When the concentration of oxalate is higher (5 or 10 mM), the product of the photoinduced phase transformation turns out to be humboldtine (Figure ).…”

Section: Geochemical Significance Of Photoreductive Dissolution Of Ir...mentioning

confidence: 99%

“…226 Previous studies also suggested that aqueous Fe(II) can be the catalyst for the recrystallization of iron (hydr)oxides, such as goethite. 222,223,227,228 Under UV irradiation, Schwertmannite was rapidly transformed to goethite in the presence of oxalate (2 mM) (Figure 8). 45,47 When the concentration of oxalate is higher (5 or 10 mM), the product of the photoinduced phase transformation turns out to be humboldtine (Figure 8).…”

Section: Ros In the Following Stepsmentioning

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: Geochemical Significance Of Photoreductive Dissolution Of Ir...mentioning

confidence: 99%

Section: Ros In the Following Stepsmentioning

confidence: 99%

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

Liu

Zhu

et al. 2022

ACS Earth Space Chem.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

“…To mimic environmentally relevant Fe(II) concentrations, the ratios of Fe(II) spike to native soil Fe were 0.072 and 0.238 mol/mol for LCZO and CCZO soils, respectively. Because the Fe(II) spike consisted primarily of 57 Fe, the f 57 Fe values of Fe(II) aq were used to calculate the relative amount of Fe atoms in native soil Fe minerals that exchanged with the Fe(II) aq by using a mass balance approach: ,, Fe atom exchange (%) = N normala normalq [ f a q i − f F e false( normalI normalI false) t ] N normals normalo normali normall normalt normalo normalt [ f F e false( normalI normalI false) t − f s o i l i ] × 100 where N aq is the total number of moles of Fe(II) aq in the solution, N soil tot is the total number of moles of native soil Fe(III), f aq i is the initial isotopic fraction of Fe(II) aq , f soil i is the initial isotopic fraction of native soil Fe, and f Fe(II) t is the isotopic fraction of Fe(II) aq at reaction time t .…”

Section: Materials and Methodsmentioning

confidence: 99%

Electron Transfer, Atom Exchange, and Transformation of Iron Minerals in Soils: The Influence of Soil Organic Matter

Chen

Dong

Thompson

2023

Environ. Sci. Technol.

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Despite substantial experimental evidence of electron transfer, atom exchange, and mineralogical transformation during the reaction of Fe(II) aq with synthetic Fe(III) minerals, these processes are rarely investigated in natural soils. Here, we used an enriched Fe isotope approach and Mossbauer spectroscopy to evaluate how soil organic matter (OM) influences Fe(II)/Fe(III) electron transfer and atom exchange in surface soils collected from Luquillo and Calhoun Experimental Forests and how this reaction might affect Fe mineral composition. Following the reaction of 57 Fe-enriched Fe(II) aq with soils for 33 days, Mossbauer spectra demonstrated marked electron transfer between sorbed Fe(II) and the underlying Fe(III) oxides in soils.Comparing the untreated and OM-removed soils indicates that soil OM largely attenuated Fe(II)/Fe(III) electron transfer in goethite, whereas electron transfer to ferrihydrite was unaffected. Soil OM also reduced the extent of Fe atom exchange. Following reaction with Fe(II) aq for 33 days, no measurable mineralogical changes were found for the Calhoun soils enriched with high-crystallinity goethite, while Fe(II) did drive an increase in Fe oxide crystallinity in OM-removed LCZO soils having low-crystallinity ferrihydrite and goethite. However, the presence of soil OM largely inhibited Fe(II)-catalyzed increases in Fe mineral crystallinity in the LCZO soil. Fe atom exchange appears to be commonplace in soils exposed to anoxic conditions, but its resulting Fe(II)-induced recrystallization and mineral transformation depend strongly on soil OM content and the existing soil Fe phases.

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“…Подводная фауна районов железомарганцевых конкреций. ЖМК представляют собой новый вид минерального сырья, который содержит стратегически значимые металлы для черной (Mn) и цветной (Ni, Cu, Co) металлургии, по содержанию и ресурсному потенциалу не уступающие эксплуатируемым наземным рудным объектам, выгодно отличающиеся от них комплексным составом и сорбционными свойствами [8].…”

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On the possibility of reducing man-made burden on benthic biotic communities when mining solid minerals using technical means of various designs

Sudarikov

Yungmeyster

Korolev

et al. 2022

PMI

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The paper analyses features of the species composition and diversity of biotic communities living within the ferromanganese nodule fields (the Clarion-Clipperton field), cobalt-manganese crusts (the Magellan Seamounts) and deep-sea polymetallic sulphides (the Ashadze-1, Ashadze-2, Logatchev and Krasnov fields) in the Russian exploration areas of the Pacific and Atlantic Oceans. Prospects of mining solid minerals of the world’s oceans with the least possible damage to the marine ecosystems are considered that cover formation of the sediment plumes and roiling of significant volumes of water as a result of collecting the minerals as well as conservation of the hydrothermal fauna and microbiota, including in the impact zone of high temperature hydrothermal vents. Different concepts and layout options for deep-water mining complexes (the Indian and Japanese concepts as well as those of the Nautilus Minerals and Saint Petersburg Mining University) are examined with respect to their operational efficiency. The main types of mechanisms that are part of the complexes are identified and assessed based on the defined priorities that include the ecological aspect, i.e. the impact on the seabed environment; manufacturing and operating costs; and specific energy consumption, i.e. the technical and economic indicators. The presented morphological analysis gave grounds to justify the layout of a deep-sea minerals collecting unit, i.e. a device with suction chambers and a grip arm walking gear, selected based on the environmental key priority. Pilot experimental studies of physical and mechanical properties of cobalt-manganese crust samples were performed through application of bilateral axial force using spherical balls (indenters) and producing a rock strength passport to assess further results of the experimental studies. Experimental destructive tests of the cobalt-manganese crust by impact and cutting were carried out to determine the impact load and axial cutting force required for implementation of the collecting system that uses a clamshell-type effector with a built-in impactor.

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Fe(II)-induced transformation of iron minerals in soil ferromanganese nodules

Cited by 15 publications

References 71 publications

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

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

Electron Transfer, Atom Exchange, and Transformation of Iron Minerals in Soils: The Influence of Soil Organic Matter

On the possibility of reducing man-made burden on benthic biotic communities when mining solid minerals using technical means of various designs

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