Ferrihydrite transformation under the impact of humic acid and Pb: kinetics, nanoscale mechanisms, and implications for C and Pb dynamics

Lu, Yang; Hu, Shiwen; Wang, Zimeng; Ding, Yang; Lü, Guang-Hong; Lin, Zhang; Dang, Zhi; Shi, Zhenqing

doi:10.1039/c8en01327f

Cited by 63 publications

(51 citation statements)

References 93 publications

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“…These elements could be incorporated in mineral structures or adsorbed on specific sites. The adsorption of heavy metals onto clay and oxides surface might cause a pHpzc shift towards higher values, thus rendering surfaces more positive at higher pH and promoting adsorption of oxyanions [8,[56][57][58]. Fe (hydr-)oxides structure may incorporate metals cations and adsorb As-ions more effectively, due to a better matching of ion size and orientation, also by shortening the atom-to-atom distances between adsorbent and adsorbate [59].…”

Section: Discussionmentioning

confidence: 99%

Mining Rock Wastes for Water Treatment: Potential Reuse of Fe- and Mn-Rich Materials for Arsenic Removal

Casentini

Lazzazzara

Amalfitano

et al. 2019

Water

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The worldwide mining industry produces millions of tons of rock wastes, raising a considerable burden for managing both economic and environmental issues. The possible reuse of Fe/Mn-rich materials for arsenic removal in water filtration units, along with rock properties, was evaluated. By characterizing and testing 47 samples collected from the Joda West Iron and Manganese Mine in India, we found As removal up to 50.1% at 1 mg/L initial As concentration, with a corresponding adsorption capacity of 0.01–0.46 mgAs/g mining waste. The As removal potential was strictly related to spectral, mineralogical, and elemental composition of rock wastes. Unlike rock crystallinity due to quartz and muscovite, the presence of hematite, goethite, and kaolinite, in association with the amorphous fractions of Fe and Al, enhanced the As adsorption. The natural content of arsenic indicated itself the presence of active sorptive sites. The co-occurrence of site-specific competitors (i.e., phosphate) represented a consequent limitation, whereas the content of Ce, Cu, La, and Pb contributed positively to the As adsorption. Finally, we proposed a simplified multiple linear model as predictive tool to select promising rock wastes suitable for As removal by water filtration in similar mining environments: As predicted = 0.241 + 0.00929[As] + 0.000424[La] + 0.000139[Pb] − 0.00022[P].

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Section: Discussionmentioning

confidence: 99%

Mining Rock Wastes for Water Treatment: Potential Reuse of Fe- and Mn-Rich Materials for Arsenic Removal

Casentini

Lazzazzara

Amalfitano

et al. 2019

Water

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“…(iv) Often, a portion of the ferrihydrite rapidly grows large enough to enter the particulate phase and precipitate out of solution, along with the associated TE (Stanton et al 2007;Baken et al 2015). (v) Ferrihydrites are thermodynamically unstable and may eventually rearrange to form more structured oxyhydroxides such as goethite, hematite, lepidocrocite, magnetite, or schwertmannite, during which some of the occluded TE and DOM may be released (Vu et al 2013;Lu et al 2019); however, the kinetics of rearrangement and reprecipitation processes are slow and limited in moving waters (Brookins 1988;Cornell et al 1989;Das et al 2011). Hence, these more stable forms may not be the dominant colloidal form of Fe in lotic areas, despite favourable Eh conditions.…”

Section: Redox Potentialmentioning

confidence: 99%

Geochemical and biological controls on the ecological relevance of total, dissolved, and colloidal forms of trace elements in large boreal rivers: review and case studies

et al. 2020

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The concentrations of trace elements (TEs) in large boreal rivers can fluctuate markedly due to changing water levels and flow rates associated with spring melt and variable contributions from tributaries and groundwaters, themselves having different compositions. These fluctuating and frequently high concentrations create regulatory challenges for protecting aquatic life. For example, water quality criteria do not account for changes in flow regimes that can result in TE levels that may exceed regulatory limits, and neither do they account for the markedly different lability and bioaccessibility of suspended solids. This review addresses the geochemical and biological processes that govern the lability and bioaccessibility of TEs in boreal rivers, with an emphasis on the challenges posed by the colloidal behaviour of many TEs, and their relationship to the dissolved fraction (i.e., <0.45 μm in size). After reviewing the processes and dynamics that give rise to the forms and behaviour of TEs in large boreal rivers, their relevance for aquatic organisms and the associated relationships between size and lability and bioaccessibility are discussed. The importance of biological variables and different forms of TEs for limiting lability and bioaccessibility are also addressed. Two case studies emphasize seasonal fluctuations and accompanying changes in the distribution of TE amongst different size fractions and associated colloidal species in large boreal rivers: the Northern Dvina and one of its tributaries, the Pinega River, both in Russia, and the Athabasca River in Alberta, Canada. Water quality in the Athabasca River is briefly discussed with respect to Canadian guidelines.

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“…Dissolved organic matter (DOM) is a ubiquitous component in the natural ecosystem and plays a crucial role in the bioavailability of nutrient elements, the speciation and transport of metals, and the transformation of minerals. − The adsorptive fractionation of DOM at the mineral–water interfaces is a significant geochemical process controlling the molecular compositions and properties of DOM, − which may further affect the metal-binding properties of DOM. Ferrihydrite, an amorphous and widely distributed iron oxyhydroxide, has strong DOM adsorption ability due to its high specific surface areas and abundance of surface hydroxyl groups .…”

Section: Introductionmentioning

confidence: 99%

Binding Properties of Fulvic Acid Before and After Fractionation on Ferrihydrite: Effects of Phosphate

Ding

Shi

2021

ACS Earth Space Chem.

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Adsorptive fractionation of dissolved organic matter (DOM) on minerals is an important geochemical process that affects the chemical compositions and properties of DOM. Phosphate, a widely occurring oxyanion in the natural environment, can compete with DOM for adsorption to iron (oxy)hydroxide surfaces, and thus, may change the compositions and reactivity of DOM during the adsorptive fractionation process. In this study, we investigated the effect of the adsorptive fractionation of fulvic acid (FA) at the ferrihydrite− water interfaces with or without phosphate on the optical compositions and the binding properties of FA by employing spectroscopic methods combined with two-dimensional correlation spectroscopy (2DCOS) analysis and potentiometric titration coupled with WHAM 7 model calculation. Our results showed that the presence of phosphate increased the concentrations of total organic carbon, aromatic components, chromophores, acidic groups, and fluorescent fractions in FA samples after adsorptive fractionation, indicating that phosphate would compete with these organic components for the binding sites of ferrihydrite and thus affect the partition of FA components at the ferrihydrite−water surfaces. The 2DCOS analysis revealed that phosphate competed with FA components in the order as follows: fulvic-like fractions (350 nm) > humic-like fractions (460 nm) or fulvic-like fractions (305 nm). Furthermore, the presence of phosphate during the adsorptive fractionation of FA enhanced the Cu binding ability of FA but did not change the binding sequence of Cu to FA components. Our results contribute to understanding the metal-binding characteristics of DOM under the influence of complex interactions among DOM, minerals, and inorganic constituents.

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Ferrihydrite transformation under the impact of humic acid and Pb: kinetics, nanoscale mechanisms, and implications for C and Pb dynamics

Abstract: We, at nanoscale, demonstrated a visualized description of ferrihydrite transformation to crystalline Fe oxides under the impact of Pb and HA.

Cited by 63 publications

References 93 publications

Mining Rock Wastes for Water Treatment: Potential Reuse of Fe- and Mn-Rich Materials for Arsenic Removal

Mining Rock Wastes for Water Treatment: Potential Reuse of Fe- and Mn-Rich Materials for Arsenic Removal

Geochemical and biological controls on the ecological relevance of total, dissolved, and colloidal forms of trace elements in large boreal rivers: review and case studies

Binding Properties of Fulvic Acid Before and After Fractionation on Ferrihydrite: Effects of Phosphate

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