Adsorption of As<sup>III</sup>, As<sup>V</sup>and dimethylarsinic acid onto synthesized lepidocrocite

Wan, Junfeng; Simon, Stéphane; Deluchat, Véronique; Dictor, Marie Christine; Dagot, Christophe

doi:10.1080/10934529.2013.776916

Cited by 14 publications

(9 citation statements)

References 38 publications

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“…Both As(V) and As(III) were efficiently removed from solutions, possibly either through adsorption onto and/or coprecipitation with biogenic Fe(III) minerals (Figure ). In the present study, the maximum molar ratios of As immobilized /Fe precipitated in biogenic lepidocrocite, calculated by differences in the concentrations of soluble As and Fe, before and after Fe(II) oxidation, achieved 0.063 ± 0.003 and 0.049 ± 0.003 for fixed Fe/As series with initial Fe/As(III) = 37.5 and initial Fe/As(V) = 37.5, respectively, which are higher than those in chemically synthesized lepidocrocite (0.061 and 0.022 for As(III) and As(V), respectively) . The higher As/Fe in solids would be associated with coprecipitation of As with biogenic Fe(III) minerals in this study.…”

Section: Resultscontrasting

confidence: 53%

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Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

Xiu

Guo

Shen

et al. 2016

Environ. Sci. Technol.

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An anaerobic nitrate-reducing Fe(II)-oxidizing bacterium, Pseudogulbenkiania sp. strain 2002, was used to investigate As immobilization by biogenic Fe oxyhydroxides under different initial molar ratios of Fe/As in solutions. Results showed that Fe(II) was effectively oxidized, mainly forming lepidocrocite, which immobilized more As(III) than As(V) without changing the redox state of As. When the initial Fe/As ratios were kept constant, higher initial Fe(II) concentrations immobilized more As with higher Asimmobilized/Feprecipitated in biogenic lepidocrocite. EXAFS analysis showed that variations of initial Fe(II) concentrations did not change the As-Fe complexes (bidentate binuclear complexes ((2)C)) with a fixed As(III) or As(V) initial concentration of 13.3 μM. On the other hand, variations in initial As concentrations but fixed Fe(II) initial concentration induced the co-occurrence of bidentate binuclear and bidentate mononuclear complexes ((2)E) and bidentate binuclear and monodentate mononuclear complexes ((1)V) for As(III) and As(V)-treated series, respectively. The coexistence of (2)C and (2)E complexes (or (2)C and (1)V complexes) could contribute to higher As removal in experimental series with higher initial Fe(II) concentrations at the same initial Fe/As ratio. Simultaneous removal of soluble As and nitrate by anaerobic nitrate-reducing Fe(II)-oxidizing bacteria provides a feasible approach for in situ remediation of As-nitrate cocontaminated groundwater.

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Section: Resultscontrasting

confidence: 53%

“…BoFeN1 similarly showed higher As(III) immobilization than As(V) in both high and low As series . Furthermore, chemically synthesized lepidocrocite also showed preferential incorporation of As(III) relative to As(V). , …”

Section: Resultsmentioning

confidence: 87%

Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

Xiu

Guo

Shen

et al. 2016

Environ. Sci. Technol.

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“…The different adsorption behaviour of P and As(III) with increasing pH may partially be explained by the change in surface charge of Fe(III)(oxyhydr)oxides with pH. The charge is positive at low pH, but reverses at pH 7 becoming progressively negative as pH increases [31] . Our experiments show a change from DIP to As(III)-favoured !…”

Section: Competitive Adsorption Onto Fe(iii)(oxyhydr)oxide and The Romentioning

confidence: 99%

Evaluation of phosphate-uptake mechanisms by Fe(III) (oxyhydr)oxides in Early Proterozoic oceanic conditions

2018

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Environmental contextReconstructing the Precambrian oceanic P cycle, in conjunction with the As cycle, is critical for understanding the rise of atmospheric O2 in Earth’s history. Bioavailable phosphorus (P) has been found to regulate photosynthetic activity, whereas dissolved arsenic (As) maxima correlate with photosynthetic minima. New data on empirical adsorption and coprecipitation models with Fe(III) (oxyhydr)oxides suggest coprecipitation is a more efficient method of P sorption than is adsorption in Precambrian surface ocean conditions. AbstractBanded iron formations (BIF) are proxies of global dissolved inorganic phosphate (DIP) content in Precambrian marine waters. Estimates of Precambrian DIP rely on constraining the mechanisms by which Fe(III) (oxyhydr)oxides scavenge DIP in NaCl solutions mimicking elevated Precambrian marine Si and Fe(II) concentrations. The two DIP binding modes suggested for Early Proterozoic marine waters are (1) surface attachment on pre-formed Fe(III) (oxyhydr)oxides (adsorption), and (2) incorporation of P into actively growing Fe(III) (oxyhydr)oxides (coprecipitation) during the oxidation of Fe(II) to Fe(III) (oxyhydr)oxides in the presence of DIP. It has been suggested that elevated Si concentrations, such as those suggested for Precambrian seawater, strongly inhibit adsorption of DIP in Fe(III) (oxyhydr)oxides; however, recent coprecipitation experiments show that DIP is scavenged by Fe(III) (oxyhydr)oxides in the presence of Si, seawater cations and hydrothermal As. In the present study, we show that the DIP uptake onto Fe(III) (oxyhydr)oxides by adsorption is less than 5 % of DIP uptake by coprecipitation. Differences in surface attachment and the possibility of structural capture within the Fe(III) (oxyhydr)oxides are inferred from the robust influence Si has on DIP binding during adsorption, meanwhile the influence of Si on DIP binding is inhibited during coprecipitation when As(III) and As(V) are present. In the Early Proterozoic open oceans, Fe(III) (oxyhydr)oxides precipitated when deep anoxic Fe(II)-rich waters rose and mixed with the first permanently oxygenated ocean surface waters. Our data imply that, DIP was removed from surface waters through coprecipitation with those Fe(III) (oxyhydr)oxides, rather than adsorption. Local variations in DIP and perhaps even stratification of DIP in the oceans were likely created from the continuous removal of DIP from surface waters by Fe(III) (oxyhydr)oxides, and by the partial release of DIP into the anoxic bottom waters and buried sediments. In addition to a DIP famine, the selectivity for DIP over As(V) may have led to As enrichment in surface waters, both of which would have most likely decreased the productivity of cyanobacteria and O2 production.

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“…Surface complexation modeling (SCM) techniques such as the charge distribution multi-site complexation (CD-MUSIC) [76,95,[98][99][100][101][102][103][104][105][106], the extended triple-layer model [107], isotherm modeling [108,109], and the ligand and charge distribution model (LCD) [110,111] have been used to model As species in solution and adsorbed to mineral surfaces. In general, SCM models use experimental data or quantum mechanics results such as equilibrium constants, bond lengths, and surface charges to calculate the adsorption isotherms of As on Fe mineral surfaces.…”

Section: Studying As Adsorption With Mathematical Modelsmentioning

confidence: 99%

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

2014

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A review of the literature about calculating the adsorption properties of arsenic onto mineral models using density functional theory (DFT) is presented. Furthermore, this work presents DFT results that show the effect of model charge, hydration, oxidation state, and DFT method on the structures and adsorption energies for As (oxyhydr)oxide cluster models were calculated using planewave and cluster-model DFT methods.

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Adsorption of As^III, As^Vand dimethylarsinic acid onto synthesized lepidocrocite

Cited by 14 publications

References 38 publications

Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

Evaluation of phosphate-uptake mechanisms by Fe(III) (oxyhydr)oxides in Early Proterozoic oceanic conditions

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

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Adsorption of AsIII, AsVand dimethylarsinic acid onto synthesized lepidocrocite

Cited by 14 publications

References 38 publications

Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

Stimulation of Fe(II) Oxidation, Biogenic Lepidocrocite Formation, and Arsenic Immobilization by Pseudogulbenkiania Sp. Strain 2002

Evaluation of phosphate-uptake mechanisms by Fe(III) (oxyhydr)oxides in Early Proterozoic oceanic conditions

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

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Adsorption of As^III, As^Vand dimethylarsinic acid onto synthesized lepidocrocite