Journal ArticleDOI
Arsenic(III) and arsenic(V) reactions with zerovalent iron corrosion products.
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TLDR
The results of this study suggest that Fe0 can be used as a versatile and economical sorbent for in-situ treatment of groundwater containing As(III) and As(V).Abstract:
Zerovalent iron (Fe0) has tremendous potential as a remediation material for removal of arsenic from groundwater and drinking water. This study investigates the speciation of arsenate (As(V)) and arsenite (As(III)) after reaction with two Fe0 materials, their iron oxide corrosion products, and several model iron oxides. A variety of analytical techniques were used to study the reaction products including HPLC-hydride generation atomic absorption spectrometry, X-ray diffraction, scanning electron microscopy-energy-dispersive X-ray analysis, and X-ray absorption spectroscopy. The products of corrosion of Fe0 include lepidocrocite (γ-FeOOH), magnetite (Fe3O4), and/or maghemite (γ-Fe2O3), all of which indicate Fe(II) oxidation as an intermediate step in the Fe0 corrosion process. The in-situ Fe0 corrosion reaction caused a high As(III) and As(V) uptake with both Fe0 materials studied. Under aerobic conditions, the Fe0 corrosion reaction did not cause As(V) reduction to As(III) but did cause As(III) oxidation ...read more
Citations
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Journal ArticleDOI
Arsenic removal from water/wastewater using adsorbents—A critical review
Dinesh Mohan,Charles U. Pittman +1 more
TL;DR: Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates, and some commercial adsorbents which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior.
Journal ArticleDOI
Removal of Arsenic(III) from Groundwater by Nanoscale Zero-Valent Iron
TL;DR: Nanoscale zero-valent iron (NZVI) was synthesized and tested for the removal of As(III), which is a highly toxic, mobile, and predominant arsenic species in anoxic groundwater and suggests that NZVI is a suitable candidate for both in-situ and ex-Situ groundwater treatment due to its high reactivity.
Journal ArticleDOI
Arsenic contamination, consequences and remediation techniques: a review
TL;DR: An attempt has been made in this paper to review As contamination, its effect on human health and various conventional and advance technologies which are being used for the removal of As from soil and water.
Journal ArticleDOI
Remediation technologies for heavy metal contaminated groundwater.
TL;DR: Thirty five approaches for groundwater treatment have been reviewed and classified under three large categories viz chemical, biochemical/biological/biosorption and physico-chemical treatment processes for a better understanding of each category.
Journal ArticleDOI
The limitations of applying zero-valent iron technology in contaminants sequestration and the corresponding countermeasures: the development in zero-valent iron technology in the last two decades (1994-2014).
TL;DR: The key to improving the rate of contaminants removal by ZVI and broadening the applicable pH range is to enhance ZVI corrosion and to enhance the mass transfer of the reactants including oxygen and H(+) to the ZVI surface.
References
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Methods of soil analysis. Part 3 - chemical methods.
Donald L. Sparks,A. L. Page,P. A. Helmke,R. H. Loeppert,P. N. Soltanpour,M. A. Tabatabai,Cliff T. Johnston,M. E. Sumner +7 more
Journal ArticleDOI
Effect of redox potential and pH on arsenic speciation and solubility in a contaminated soil
TL;DR: In this article, the influence of redox potential and pH on arsenic speciation and solubility was studied in a contaminated soil, and the observed slow kinetics of the As(V)-As(III) transformation and the high concentrations of Mn present indicate that, under reduced soil conditions, arsenic solubability could be controlled by a Mn{sub 3}(AsO{sub 4}){sub 2} phase.
Journal ArticleDOI
Arsenate and Chromate Retention Mechanisms on Goethite. 1. Surface Structure
TL;DR: In this paper, the authors used Extended X-ray absorption fine structure (EXAFS) spectroscopy to deduce the local coordination environment of two environmental contaminants, arsenate and chromate, on the mineral goethite (α-FeOOH).
Journal ArticleDOI
Surface Structures and Stability of Arsenic(III) on Goethite: Spectroscopic Evidence for Inner-Sphere Complexes
TL;DR: In this paper, the adsorption and stability of arsenite on goethite (α-FeOOH) was investigated using a combination of standard batch techniques and X-ray absorption spectroscopy (XAS).
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