Arsenite and arsenate binding to ferrihydrite organo-mineral coprecipitate: Implications for arsenic mobility and fate in natural environments

Xue, Qin; Ran, Ying; Tan, Yunzhi; Peacock, Caroline L.; Du, Huihui

doi:10.1016/j.chemosphere.2019.02.118

Cited by 136 publications

(52 citation statements)

References 42 publications

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“…As reported, Fe-modified biochar had lower negative charges, thus resulting in the higher electrostatic sorption of anion contaminants such as arsenate (As(V)) [24]. The formation of Fe-O-As(V) complexes were also responsible for the sorption of As(V) onto the Fe-modified biochar [46]. In comparison with the other two biochar, FRB loaded a lowest amount of Fe.…”

Section: Characterization Of Biocharmentioning

confidence: 84%

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Wang

Zhang

et al. 2020

IJERPH

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Remediation of soil heavy metal by biochar has been extensively studied. However, few studies focused on the role of biochar on the co-immobilization of cadmium (Cd(II)) and arsenate (As(V)) and related soil nutrient availability. Remediation tests were conducted with three types of pristine and ferric trichloride (FeCl3) modified biochar (rice, wheat, and corn straw biochar) in Cd-As co-contaminated soil, with application rates of 1, 5, and 10% (w/w) and the incubation of 1, 7, 10, and 15 days. Using TCLP (Toxicity Characteristic Leaching Procedure) method, 10% of FeCl3 modified corn-straw derived biochar (FCB) had the highest immobilization efficiency of Cd(II) (63.21%) and As(V) (95.10%) after 10 days of the incubation. Iron-modified biochar immobilized higher fractions of water-soluble (F1) and surface-absorbed (F2) metal fractions than pristine biochar. For FCB amendment, Cd was mostly presented in the organic matter (OM) and sulfides associated (F4) and residual (F5) fractions (88.52%), as was found in the Fe-Al (oxides and hydroxides) (F3), F4, and F5 fractions (75.87%). FCB amendment increased soil pH values and available iron contents (p < 0.05), while no changes in soil available phosphorus content (p > 0.05). This study showed that FCB application reduces the environmental mobility of metals in Cd-As contaminated soil, while it also increases soil pH and available nutrient mobility, improving soil environmental quality and reducing remediation costs.

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Section: Characterization Of Biocharmentioning

confidence: 84%

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Wang

Zhang

et al. 2020

IJERPH

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“…Results show that humic acid inhibits the adsorption of W(VI) to Fh, and the inhibitory effect of HA increases with increasing HA concentration. This phenomenon is reported for the adsorption of metal cations onto iron (hydr)oxide organominerals (Moon and Peacock, 2012;Du et al, 2016;2018a;2018b;Otero-Fariña et al, 2017;Woodward et al, 2018), but is less commonly investigated for oxyanions (Xue et al, 2019).…”

Section: Macroscopic Adsorption Phenomenamentioning

confidence: 90%

“…During data collection, the step size was 0.05 eV, and 10 scans for each sample were averaged. For XPS analyses, the C 1s peak at ~284.8 eV was used to calibrate the binding energy, and the curve-fitting program XPSPEAK41 was used to fit the spectra (Xue et al, 2019).…”

Section: Xps Experimentsmentioning

confidence: 99%

“…This is known to bind strongly with iron (hydr)oxides via surface adsorption and/or (Sposito, 1984;Chen et al, 2014;Kleber, 2015). These processes result in the formation of an organo-mineral composite (Kleber et al, 2015), in which surface properties are quite different from those of pure iron (hydr)oxide, thereby potentially affecting the transport and eventual fate of trace elements (Moon and Peacock, 2012;Liang et al, 2013;Seda et al, 2016;Du et al, 2016;Wang et al, 2016;Flynn and Catalano, 2017;Otero-Fariña et al, 2017;Du et al, 2018a;2018b;Fariña et al, 2018;Woodward et al, 2018;Xue et al, 2019). However, whether and to what extent NOM affects the binding of soluble tungstate oxyanions to mineral surfaces is still unknown.…”

Section: Introductionmentioning

confidence: 99%

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Natural organic matter decreases uptake of W(VI), and reduces W(VI) to W(V), during adsorption to ferrihydrite

et al. 2020

Chemical Geology

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Tungsten is both naturally occurring and an anthropogenically released contaminant metal in soils, sediments and water systems that typically exits as the soluble tungstate oxyanions, W(VI)O4 2− . Tungsten mobility and fate are strongly dependent on the adsorption of tungstate to mineral surfaces. However, environmental mineral surfaces are commonly coated with natural organic matter (NOM), and the role of this coating in the tungsten adsorption process, and thus in controlling tungsten reactivity and transport, is unclear. This study investigates W(VI) adsorption to ferrihydrite (Fh), a ubiquitous iron (hydr)oxide in soils and sediments, both in the absence and presence of humic acid (HA), a widely occurring type of NOM, using batch experiments coupled with spectroscopic and thermodynamic techniques. Kinetic results indicate that access to the adsorption sites for W(VI) on the organomineral surfaces is limited when Fh is coprecipitated with HA. Commensurate with this observation, batch experiments show that HA decreases W(VI) adsorption to Fh over a wide pH range (4-11), and this inhibitory effect is more pronounced at higher HA concentration. X-ray photoelectron spectroscopy (XPS) measurements demonstrate the formation of inner-sphere type W complexes on both the Fh and HA fraction of the Fh-HA binary composite. In particular, ~40% of the adsorbed W(VI) species is reduced to W(V) in the presence of HA. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) results show the presence of poly tungstate species on Fh, particularly at lower pH and in the presence of HA. Isothermal titration calorimetry shows that W(VI) adsorption to Fh is an exothermic process both in the presence and absence of HA, and that process is accompanied by a positive entropy. The findings of this work suggest that NOM not only mobilizes tungstate but also reduces tungstate from W(VI) to W(V) at environmental iron (hydr)oxide-water interfaces, which is of significance for evaluating the migration and bioavailability of tungsten in both natural and contaminated environments.

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“…High correlation coefficients indicate that As(V) and As(III) sorption can be well described by the Langmuir and the Freundlich isotherms. A number of previous studies using iron oxides as an adsorbent have accordingly reported that arsenic adsorption fits both Langmuir and Freundlich models, in particular magnetite [31,32] and amorphous iron oxide [33,34]. The Langmuir model was used to determine the adsorption maxima q max (mmol g Fe −1 ).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

As(V) and As(III) sequestration by starch functionalized magnetite nanoparticles: influence of the synthesis route onto the trapping efficiency

Robinson

Coustel

Abdelmoula

et al. 2020

Science and Technology of Advanced Materials

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We report the effect of the synthesis route of starch-functionalized magnetite nanoparticles (NPs) on their adsorption properties of As(V) and As(III) from aqueous solutions. NP synthesis was achieved by two different routes implying the alkaline precipitation of either a mixed Fe 2 + /Fe 3+ salt solution (MC samples) or a Fe 2+ salt solution in oxidative conditions (MOP samples). Syntheses were carried out with starch to Fe mass ratio (R) ranging from 0 to 10. The crystallites of starch-free MC NPs (14 nm) are smaller than the corresponding MOP (67 nm), which leads to higher As(V) sorption capacity of 0.3 mmol g Fe −1 to compare with respect to 0.1 mmol g Fe −1 for MOP at pH = 6. MC and MOP starch-functionalized NPs exhibit higher sorption capacities than a pristine one and the difference in sorption capacities between MOP and MC samples decreases with increasing R values. Functionalization tends to reduce the size of the magnetite crystallites and to prevent their agglomeration. Size reduction is more pronounced for MOP samples (67 nm (R0) to 12 nm (R10)) than for MC samples (14 nm (R0) to 9 nm (R10)). Therefore, due to close crystallite size, both MC and MOP samples, when prepared at R = 10, display similar As(V) (respectively, As(III)) sorption capacities close to 1.3 mmol g Fe −1 (respectively, 1.0 mmol g Fe −1). Additionally, according to the effect of pH on arsenic trapping, the electrostatic interactions appear as a major factor controlling As(V) adsorption while surface complexation may control As(III) adsorption.

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Arsenite and arsenate binding to ferrihydrite organo-mineral coprecipitate: Implications for arsenic mobility and fate in natural environments

Cited by 136 publications

References 42 publications

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Natural organic matter decreases uptake of W(VI), and reduces W(VI) to W(V), during adsorption to ferrihydrite

As(V) and As(III) sequestration by starch functionalized magnetite nanoparticles: influence of the synthesis route onto the trapping efficiency

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