Reduction of Se(VI) to Se(-II) by zerovalent iron nanoparticle suspensions

Olegario, Jovilynn T.; Yee, Nay; Miller, Marissa A.; Sczepaniak, John P.; Manning, Bruce A.

doi:10.1007/s11051-009-9764-1

Cited by 126 publications

(79 citation statements)

References 40 publications

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“…via monitoring wells extents the applicability of Fe 0 technology to depths for which engineered Fe 0 walls may be prohibitively expensive [15]. Currently nano-Fe 0 is mostly synthesized via the borohydride-catalyzed reduction of dissolved Fe II or Fe III [16][17][18]. The reactivity of nano-Fe 0 is sometimes further enhanced by plating Fe 0 by more electropositive metals (e.g.…”

Section: Nanoscale Iron For Groundwater Remediationmentioning

confidence: 99%

On nanoscale metallic iron for groundwater remediation

Noubactep¹,

Caré

2010

Journal of Hazardous Materials

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This communication challenges the concept that nanoscale metallic iron (nano-Fe(0)) is a strong reducing agents for contaminant reductive transformation. It is shown that the inherent relationship between contaminant removal and Fe(0) oxidative dissolution which is conventionally attributed to contaminant reduction by nano-Fe(0) (direct reduction) could equally be attributed to contaminant removal by adsorption and co-precipitation. For reducible contaminants, indirect reduction by adsorbed Fe(II) or adsorbed H produced by corroding iron (indirect reduction) is even a more probable reaction path. As a result, the contaminant removal efficiency is strongly dependent on the extent of iron corrosion which is larger for nano-Fe(0) than for micro-Fe(0) in the short term. However, because of the increased reactivity, nano-Fe(0) will deplete in the short term. No more source of reducing agents (Fe(II), H and H(2)) will be available in the system. Therefore, the efficiency of nano-Fe(0) as a reducing agent for environmental remediation is yet to be demonstrated.

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Section: Nanoscale Iron For Groundwater Remediationmentioning

confidence: 99%

On nanoscale metallic iron for groundwater remediation

Noubactep¹,

Caré

2010

Journal of Hazardous Materials

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show abstract

“…Indeed Fe(II) adsorbed by clay minerals such as montmorillonite or calcite or present in a number of solids like siderite, mackinawite, magnetite, pyrite, triolite, green rust was found to be able to reduce selenite (Refait et al, 2000;Charlet et al, 2007;Scheinost et al, 2008;Hayashi et al, 2009;Chakraborty et al, 2010). Possible reductants for Se(IV) also include zerovalent iron (Olegario et al, 2010), sodium dithionite (Geoffroy and Demopoulos, 2009), ascorbic acid (Shaker, 1996) and iodide (Ericzon et al, 1990). Many technological applications involving some of the above reductants have been proposed for the removal of selenium from process and mine wastewater and agricultural drainage water (Murphy, 1988;Zingaro et al, 1997;Zhang et al, 2008;Gonzalez et al, 2010) as well as for bioremediation of polluted sites (Hunter and Kuykendall, 2005;Antonioli et al, 2007;Ikram and Faisal, 2010).…”

Section: Introductionmentioning

confidence: 99%

The reduction of selenium(IV) by hydrogen sulfide in aqueous solutions

Pettine¹,

Gennari²,

Campanella³

et al. 2012

Geochimica et Cosmochimica Acta

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“…Other than these direct interactions between selenate and solid material, reduction processes could transform selenate into lower oxidation state Se which generates stabilisation in soil. Some authors have observed that reduction could be biotic (Siddique et al, 2006) or abiotic (Johnson and Bullen, 2003;Olegario et al, 2010).…”

Section: Introductionmentioning

confidence: 99%