A comparative study of As(III) and As(V) in aqueous solutions and adsorbed on iron oxy-hydroxides by Raman spectroscopy

Müller, K.; Ciminelli, Virgínia S. T.; Dantas, M. S. S.; Willscher, Sabine

doi:10.1016/j.watres.2010.05.053

Cited by 154 publications

(71 citation statements)

References 31 publications

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“…FTIR and Raman studies are useful for determining the bonding configurations between As species and mineral surfaces. When As adsorbs as an inner-sphere complex, characteristic vibrational frequency shifts are observable [74][75][76][77][78][79]. XANES spectroscopy can provide information about the oxidation state of As that is adsorbed to mineral surfaces [80][81][82][83][84], and can determine if the oxidation state of As or the surface changes during the adsorption process [78,85].…”

Section: Studying As Adsorption With Experimentsmentioning

confidence: 99%

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

2014

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A review of the literature about calculating the adsorption properties of arsenic onto mineral models using density functional theory (DFT) is presented. Furthermore, this work presents DFT results that show the effect of model charge, hydration, oxidation state, and DFT method on the structures and adsorption energies for As (oxyhydr)oxide cluster models were calculated using planewave and cluster-model DFT methods.

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Section: Studying As Adsorption With Experimentsmentioning

confidence: 99%

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

2014

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“…Arsenic contamination can come from geological, industrial and agricultural sources [1,2]. Cadmium exerts pressure on the environment mainly through anthropogenic discharge [3].…”

Section: Introductionmentioning

confidence: 99%

Arsenate and cadmium co-adsorption and co-precipitation on goethite

Jiang

Luo

et al. 2013

Journal of Hazardous Materials

136

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“…Recent X-ray absorption spectroscopy (XAS) and Fourier transform infrared spectroscopy (FT-IR) studies have reported that arsenic sequestration in an iron oxide is due (but not limited) to the following mechanisms: coprecipitation, adsorption by the formation of surface precipitates, and/or formation of inner-and outer-sphere complexes (Wang et al 2008;Morin et al 2009;Müller et al 2010;Wang et al 2011). The mode of arsenic sequestration/incorporation is different for different minerals.…”

Section: Resultsmentioning

confidence: 99%

Understanding abiotic ferrihydrite re-mineralization by ferrous ions

Raghav

Sáez

Ela

2014

Int. J. Environ. Sci. Technol.

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In this work, we study the abiotic re-mineralization of ferrihydrite under reducing conditions, obtained by adding zero-valent iron (ZVI) to a suspension of ferrihydrite particles. Under similar conditions, the system (ferrihydrite and ZVI) proceeded along two different transformation pathways differentiated by whether a magnetic stirrer or an overhead stirrer was used for mixing. X-ray diffraction characterization of the solid products showed that magnetite was the sole product of ferrihydrite transformation when a magnetic stirrer was used, whereas both goethite and magnetite were formed when an overhead stirrer was used. The system also behaved differently in terms of transformation kinetics and amount of magnetite formed. The quantification of magnetite generated was performed using a procedure developed in this study. The role of four mechanisms was investigated to explain these observed differences, namely-(1) presence/absence of high local Fe 2? concentrations, (2) mechanical abrasion, (3) presence/absence of a magnetic field, and (4) presence/ absence of a crystalline ZVI surface. Ferrous ions are expected to be concentrated near the magnetic bead on the magnetic stirrer as opposed to a more dispersed distribution with the overhead stirrer. This mechanistic study concluded that the presence of high local Fe 2? concentrations in the system leads to magnetite formation and the absence of the same leads to mixed goethite/magnetite or magnetite-free systems. These findings have significant implications for the mobilization of arsenic from iron (III) hydroxides as the conditions move from oxidizing to reducing, such as often occurs in engineered landfills and natural carbon-rich sediments.

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A comparative study of As(III) and As(V) in aqueous solutions and adsorbed on iron oxy-hydroxides by Raman spectroscopy

Cited by 154 publications

References 31 publications

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

Arsenate and cadmium co-adsorption and co-precipitation on goethite

Understanding abiotic ferrihydrite re-mineralization by ferrous ions

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