Sorption of As(III) and As(V) to siderite, green rust (fougerite) and magnetite: Implications for arsenic release in anoxic groundwaters

Jönsson, Jan‐Ingvar; Sherman, David M.

doi:10.1016/j.chemgeo.2008.06.036

Cited by 216 publications

(208 citation statements)

References 35 publications

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“…However, the adsorption capacity is lower when compared to biomass modified with cationic polyelectrolyte (Loukidou et al, 2003). The mechanism of As (V) adsorption on the surface of amorphous Fe (III) oxyhidroxides involves both inner and outer sphere complexation (Goldberg and Johnston, 2001;Jonsson and Sherman, 2008). That implies heterogenous adsorption sites that have different energy and may explain the high correlation coefficient of Freundlich equilibrium model.…”

Section: Adsorption Isothermsmentioning

confidence: 96%

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Urík

Littera

Ševc

et al. 2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:Arsenic is a ubiquitous element in the environment and occurs naturally in both organic and inorganic forms. Under aerobic condition, the dominant form of arsenic in waters is arsenate, which is highly mobile and toxic. Arsenic poisoning from drinking water remains a serious world health issue. There are various standard methods for arsenic removal from drinking waters (coagulation, sorption, ion-exchange reactions or methods of reverse osmosis) and alternative methods, such as biosorption. Biosorption of arsenic from natural and model waters by native or chemically modified (with urea or ferric oxyhydroxides) plant biomass prepared from sawdust of Picea abies was studied. The kinetic of the adsorption process fitted well the pseudo second order adsorption model and equilibrium was achieved after 2 h. The results showed that biosorption was well described by both Langmuir and Freundlich isotherms. The maximum biosorption capacity of the sawdust modified with ferric oxyhydroxides, evaluated by Langmuir adsorption model, was 9.259 mg/g, while the biosorption capacity of unmodified biosorbent or biosorbent modified with urea was negligible. The adsorption capacity is comparable to results published by other authors, suggesting that the prepared chemically modified biosorbent has potential in remediation of contaminated waters.

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Section: Adsorption Isothermsmentioning

confidence: 96%

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Urík

Littera

Ševc

et al. 2009

Int. J. Environ. Sci. Technol.

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“…Furthermore, As(III)-mackinawite interactions led to the formation of an orpiment (As 2 S 3 )-like species during reduction of As(V)-co-precipitated schwertmannite (Burton et al 2013(Burton et al , 2014. The extent and strength of As sorption to Fe sulfides depend on aqueous As speciation (Bostick and Fendorf 2003;Jönsson and Sherman 2008;Couture et al 2013) and iron sulfide mineralogy (Gallegos et al 2007;Jönsson and Sherman 2008;Renock et al 2009;Couture et al 2013). Ultimately, the interactions of these redox transformations determine how sulfate reduction affects As mobility, considering the various sequestration and mobilization processes.…”

Section: Introductionmentioning

confidence: 99%

Arsenic bioavailability to rice plant in paddy soil: influence of microbial sulfate reduction

2015

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Purpose High arsenic (As) mobility in anaerobic paddy soil due to microbial Fe-and As-reducing processes results in As accumulation into rice plants. Sulfur (S) also undergoes microbial reducing processes in the anaerobic paddy soil, while this process interacts with the Fe-and As-reducing processes, forms secondary minerals, and thus influences As mobility in paddy soil. This work was carried out to investigate the role of sulfur and sulfate-reducing bacteria (SRB) in As redox transformation and bioavailability to rice plant in an anaerobic paddy soil. Materials and methods Anaerobic incubation experiments with or without sulfate (SO 4 2− ) and SRB were carried out to monitor S and iron (Fe) dynamics and their relations to As speciation and release to soil solution. Rice cultivation in pot experiment was then carried out to check the SO 4 2− amendment in bioavailability and uptake into rice plants.Results and discussion The inoculation of an enriched SRB community into the sterilized paddy soil increased reduction and release of As to the soil solution after flooding, showing its ability in arsenate (As(V)) as well as SO 4 2− reduction to arsenite (As(III)) and sulfide (S 2− ), respectively. Sulfate addition (2 and 100 mM) into the anaerobic paddy soil increased the reduction of SO 4 2− and ferric iron (Fe 3+ ) and resulted to lower dissolved As in the soil solution, which limited As mobility in the paddy soil. Application of SO 4 2− (100 mg kg −1 ) into paddy soil finally decreased the concentration of dissolved As in the soil solution by 23.5 % and also decreased As content in rice roots and iron plaque by 22.6 and 30.5 %, respectively. Conclusions The results revealed the important role of sulfur and the SRB activity in As speciation and mobility in anaerobic paddy soil, implying a lower As bioavailability to rice plants under sulfur-enriched anaerobic paddy soil, and an efficient way to reduce As accumulation in rice plants by sulfur fertilization in paddy soils.

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“…1) quickly in mid-and high-sulfate treatments (Fig. 5) as the result of the precipitation of the produced Fe 2+ with excess sulfide by the formation of Fe II sulfide minerals (Jonsson and Sherman 2008;Poulton 2003).…”

Section: Effect Of Sulfidogenesis On Iron Transformation and Redistrimentioning

confidence: 98%

The effect of microbial sulfidogenesis on the stability of As–Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions

Wang

Pan

et al. 2015

Environ Sci Pollut Res

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The effect of microbial sulfidogenesis on As transformation and mobilization in solid phase with low Fe/As ratio is still not well known. In this study, microbial transformation and mobilization of As in the As-Fe coprecipitate with different sulfate levels were investigated using chemical extraction and K-edge XANES of As and S. Results showed that approximately 2.7, 24.4, and 83.7 % of total As were released into the aqueous phase in the low-, mid-, and high-sulfate treatments, respectively, indicating that the presence of large amounts of sulfate could enhance microbial arsenic mobilization in the As-Fe coprecipitate. In the low-sulfate treatment, As mobilization was primarily attributed to the reductive dissolution of the Fe (oxy)hydroxides and the As reduction and desorption. In the mid- and high-sulfate treatments, the reduction of arsenate and ferric iron was significantly enhanced. Complete ferric iron reduction was observed in the solid phase, implying that Fe (oxy)hydroxide was transformed to secondary minerals and may be the one of the primary causes for the enhanced As mobilization. Thermodynamic calculations predicted the formation of thioarsenite species after 35 days of incubation based on the concentration of dissolved As(III) and S(-II). Since thioarsenic species is more mobile, its formation may be one of the most important factors enhancing the As release in the high-sulfate system. The result of this study is of significance to completely predict the environmental behavior of As associated with Fe (hydr)oxides in the presence of microbial sulfidogenesis under anoxic conditions.

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Sorption of As(III) and As(V) to siderite, green rust (fougerite) and magnetite: Implications for arsenic release in anoxic groundwaters

Cited by 216 publications

References 35 publications

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Removal of arsenic (V) from aqueous solutions using chemically modified sawdust of spruce (Picea abies): Kinetics and isotherm studies

Arsenic bioavailability to rice plant in paddy soil: influence of microbial sulfate reduction

The effect of microbial sulfidogenesis on the stability of As–Fe coprecipitate with low Fe/As molar ratio under anaerobic conditions

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