Arsenic(III) Oxidation and Arsenic(V) Adsorption Reactions on Synthetic Birnessite

Manning, Bruce A.; Fendorf, Scott; Bostick, Benjamín C.; Suarez, Donald L.

doi:10.1021/es0110170

Cited by 579 publications

(488 citation statements)

References 36 publications

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“…Rapid conversion from As III to As V during soil, sediment and fly ash extraction has been observed in other studies (Ellwood and Maher, 2003;Wang et al, 1995). This transformation could be facilitated in the presence of some microorganisms (Ahmann et al, 1997;Cummings et al, 1999;Turpeinen et al, 1999;Wilkie and Hering, 1998) and in the presence of hydroxides of Fe, Al, and Mn (Driehaus et al, 1995;Manning et al, 2002;Matera et al, 2003;Mucci et al, 2000;Raven et al, 1998;Scott and Morgan, 1995;Takamatsu et al, 1985;Tournassat et al, 2002). PACS-2 contains fairly high concentrations of Fe (4.09 ± 0.06%), Al (6.62 ± 0.32%), and Mn (440 ± 19 μg/g).…”

Section: Soil Extraction With Phosphate Alonementioning

confidence: 53%

Extraction of arsenate and arsenite species from soils and sediments

Georgiadis

Cai

Solo‐Gabriele

2006

Environmental Pollution

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The primary objective of this study was to develop a simple method that can be used to extract the more readily mobilizable and bioavailable arsenic species from soil and sediment while at the same time minimizing the transformation between (As III ) and (As V ), the two most commonly found arsenic species in the environment. Several extraction strategies were evaluated using phosphate as extractant in combination with either ethylenediaminetetraacetic acid (EDTA), hydroxylamine hydrochloride (NH 2 OH·HCl), or sodium diethyldithiocarbamate trihydrate (NaDDC).The addition of EDTA in the phosphate solution did not prevent As III from oxidation. While promising results were shown when 1% NH 2 OH·HCl was added, conversion of As III began to occur with extended extraction time (>12 h). Good results were achieved using 10 mM phosphate and 0.5% NaDDC where As III oxidation was clearly minimized. The combined phosphate and NaDDC solution was applied to several soil and sediment samples. As III spiked was quantitatively recovered in all soil types tested.

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Section: Soil Extraction With Phosphate Alonementioning

confidence: 53%

Extraction of arsenate and arsenite species from soils and sediments

Georgiadis

Cai

Solo‐Gabriele

2006

Environmental Pollution

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“…23 samples, the As−Mn distance is observed to be 3.22 Å (Table 1), which is completely consistent with the previously proposed As−Mn distance for As(V)-and As(III)-treated birnessite samples. 22 These results suggest that a bidentate binuclear corner-sharing complex might form between H 2 AsO 4 − and MnO x . Figure 6A shows the Fourier-transformed k 3 -weighted EXAFS oscillations into R space of Mn K edge in Mncontaining samples, and Figure 6B shows the corresponding k 3 ·χ(k) in the k range of 2.5−11.0 Å −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 83%

Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation

Zhang

Liu

et al. 2014

Environ. Sci. Technol.

206

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ABSTRACT:In our previous studies, a synthesized Fe−Mn binary oxide was found to be very effective for both As(V) and As(III) removal in aqueous phase, because As(III) could be easily oxidized to As(V). As(III) oxidation and As(V) sorption by the Fe−Mn binary oxide may also play an important role in the natural cycling of As, because of its common occurrence in the environment. In the present study, the respective role of Fe and Mn contents present in the Fe−Mn binary oxide on As(III) removal was investigated via a direct in situ determination of arsenic speciation using X-ray absorption spectroscopy. X-ray absorption near edge structure results indicate that Mn atoms exist in a mixed valence state of +3 and +4 and further confirm that MnO x (1.5 < x < 2) content is mainly responsible for oxidizing As(III) to As(V) through a two-step pathway [reduction of Mn(IV) to Mn(III) and subsequent Mn(III) to Mn(II)] and FeOOH content is dominant for adsorbing the formed As(V). No significant As(III) oxidation by pure FeOOH had been observed during its sorption, when the system was exposed to air. The extended X-ray absorption fine structure results reveal that the As surface complex on both the As(V)-and As(III)-treated sample surfaces is an inner-sphere bidentate binuclear corner-sharing complex with an As−M (M = Fe or Mn) interatomic distance of 3.22−3.24 Å. In addition, the MnO x and FeOOH contents exist only as a mixture, and no solid solution is formed. Because of its high effectiveness, low cost, and environmental friendliness, the Fe−Mn binary oxide would play a beneficial role as both an efficient oxidant of As(III) and a sorbent for As(V) in drinking water treatment and environmental remediation. ■ INTRODUCTIONArsenic, a ubiquitous trace element in the aquatic environment, is introduced from both natural processes and anthropogenic sources. 1 In natural water, arsenic is mostly found in two inorganic forms, namely, arsenate and arsenite. In welloxygenated water, As(V) is the major arsenic species, while As(III) is dominant in reduced groundwater. As(III) is more toxic, soluble, and mobile than As(V). 2,3 A high level of arsenic in groundwater and surface waters is a major concern worldwide, because of its high toxicity and carcinogenicity. To minimize the possible health risks, the World Health Organization (WHO) has set a stringent limit of 10 μg L −1 As for drinking water. 4 The adsorption reactions between arsenic and minerals (particularly metal oxides) play a very important role in its mobility and potential bioavailability because arsenic can be strongly adsorbed onto the surface of metal oxides, such as iron (hydr)oxides, alumina, and manganese oxides, which commonly occur in the aquatic environment. 5,6 Adsorption is also regarded as a promising method for the removal of arsenic from water, owing to its simple operation, high efficiency, and cost effectiveness. Numerous investigations have focused on arsenic immobilization by natural and synthetic Fe (hydr)oxides and Fe-containing materials. 7−10 Recently,...

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“…As(V) was adsorbed onto manganese oxides through complexation between As(V) and surface Mn-OH [1]. However, As(III) adsorption involved additional oxidation of As(III) to As(V) [1].…”

Section: Effect Of Ca 2+ On Arsenic Adsorption Onto δMnomentioning

confidence: 99%

“…The adsorption of different pollutants (e.g., natural organic matter, phosphate, arsenic, and hydroquinone) onto natural or synthetic manganese oxides has been investigated so far with interfacial reaction mechanisms, including adsorption, surface complex formation, heterogeneous oxidation, and reductive dissolution [1][2][3]. However, previous studies mainly focused on prepared adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Effects of calcium ions on surface characteristics and adsorptive properties of hydrous manganese dioxide

Liu

Qiang

et al. 2009

Journal of Colloid and Interface Science

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The effects of calcium ions (Ca 2+ ) on the surface characteristics and adsorptive properties of hydrous manganese dioxide (δMnO 2 ), taking arsenic and humic acid as model pollutants, were systematically investigated. The FTIR spectra and SEM/EDX analyses indicate coordination between Ca 2+ and the surface hydroxyls (≡Mn-OH) of δMnO 2 , which leads to an increase of the surface ζ potential. Ca 2+ can facilitate δMnO 2 aggregation, as indicated by the particle size distribution (PSD) and on-line flocculating index (FI). The variation of δMnO 2 surface characteristics that is induced by Ca 2+ enhances the adsorption of humic acid (HA) and arsenic onto δMnO 2 . The adsorption of HA is enhanced more significantly by Ca 2+ than that of arsenic, which is positively related to the coordination strength between Ca 2+ and individual pollutants. The SEM/EDX analysis shows the formation of Ca-HA complexes, which have a higher affinity for δMnO 2 than HA. The bridging effect of Ca 2+ plays a major role in enhancing HA adsorption onto δMnO 2 . Due to different interactions between Ca 2+ and pollutants, the adsorption mechanism is pollutant-dependent in the presence of Ca 2+ .

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Arsenic(III) Oxidation and Arsenic(V) Adsorption Reactions on Synthetic Birnessite

Cited by 579 publications

References 36 publications

Extraction of arsenate and arsenite species from soils and sediments

Extraction of arsenate and arsenite species from soils and sediments

Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation

Effects of calcium ions on surface characteristics and adsorptive properties of hydrous manganese dioxide

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