Structural study of selenium(IV) substitutions in calcite

Aurelio, G.; Fernández-Martı́nez, Alejandro; Cuello, G.J.; Román-Ross, Gabriela; Alliot, I.; Charlet, Laurent

doi:10.1016/j.chemgeo.2009.12.004

Cited by 51 publications

(42 citation statements)

References 34 publications

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“…They suggest that in the presence of the Ca 2+ , the oxidation of As(III) to As(V) and the stabilization of As(V) occurs due to the formation of calcium arsenate complexes in the aqueous phase. A similar case has been reported by Aurelio et al (2010) ) was found by Renard et al (2013) to have insignificant physicochemical affinity during calcite formation. Since both selenium oxyanions have the same electronic charge (-2), this behaviour was attributed to the different geometry and bond valence of selenate, which when substituting for the carbonate anion distorts to a greater extent the calcite crystal structure compared to selenite.…”

Section: Leaching Mechanismssupporting

confidence: 85%

Comparative study of ageing, heat treatment and accelerated carbonation for stabilization of municipal solid waste incineration bottom ash in view of reducing regulated heavy metal/metalloid leaching

Santos

Mertens

Salman

et al. 2013

Journal of Environmental Management

115

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This study compared the performance of four different approaches for stabilization of regulated heavy metal and metalloid leaching from municipal solid waste incineration bottom ash (MSWI-BA): (i) short term (three months) heap ageing, (ii) heat treatment, (iii) accelerated moist carbonation, and (iv) accelerated pressurized slurry carbonation. Two distinct types of MSWI-BA were tested in this study: one originating from a moving-grate furnace incineration operation treating exclusively household refuse (sample B), and another originating from a fluid-bed furnace incineration operation that treats a mixture of household and light industrial wastes (sample F). The most abundant elements in the ashes were Si (20-27 wt.%) and Ca (16-19 wt.%), followed by significant quantities of Fe, Al, Na, S, K, Mg, Ti, and Cl. The main crystalline substances present in the fresh ashes were Quartz, Calcite, Apatite, Anhydrite and Gehlenite, while the amorphous fraction ranged from 56 to 73 wt.%. The leaching values of all samples were compared to the Flemish (NEN 7343) and the Walloon (DIN 38414) regulations from Belgium. Batch leaching of the fresh ashes at natural pH showed that seven elements exceeded at least one regulatory limit (Ba, Cr, Cu, Mo, Pb, Se and Zn), and that both ashes had excess basicity (pH > 12). Accelerated carbonation achieved significant reduction in ash basicity (9.3-9.9); lower than ageing (10.5-12.2) and heat treatment (11.1-12.1). For sample B, there was little distinction between the leaching results of ageing and accelerated carbonation with respect to regulatory limits; however carbonation achieved comparatively lower leaching levels. Heat treatment was especially detrimental to the leaching of Cr. For sample F, ageing was ineffective and heat treatment had marginally better results, while accelerated carbonation delivered the most effective performance, with slurry carbonation meeting all DIN limits. Slurry carbonation was deemed the most effective treatment process, achieving consistently significant leaching stabilization, while also effectively washing out Cl ions, a requirement for the utilization of the ashes in construction applications. The benefits of carbonation were linked to the formation of significant quantities of Ca-carbonates, including appreciable quantities of the Aragonite polymorph formed in the slurry carbonated samples.

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Section: Leaching Mechanismssupporting

confidence: 85%

Comparative study of ageing, heat treatment and accelerated carbonation for stabilization of municipal solid waste incineration bottom ash in view of reducing regulated heavy metal/metalloid leaching

Santos

Mertens

Salman

et al. 2013

Journal of Environmental Management

115

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“…It is adjusted to make the coordination number of the O--SeO 3 shell, 727 N iso (O--SeO 3 )= 3.0. The bond distances obtained from modeling the isotropic data are in excellent 728 agreement with those reported by Aurelio et al (Aurelio et al, 2010). They concluded from their 729 structural study of selenium(IV) substitution in calcite, that selenite is structurally incorporated into 730 calcite, where it substitutes for a carbonate ion in the crystal structure.…”

Section: Structure Of the Selenite Incorporation Species 704supporting

confidence: 78%

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Heberling

Vinograd

Polly

et al. 2014

Geochimica et Cosmochimica Acta

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“…Therefore a substitution with the carbonate group is more likely than a substitution of the carbonate group by SeO 4 2− with a different geometry and valence, which would distort to a greater extent the calcite structure. This process has already been discussed Alexandratos et al, 2007;Tang et al, 2007;Aurelio et al, 2010) and increasingly more reliable measurements using, for example synchrotron X-ray adsorption spectroscopy, have demonstrated that selenite is incorporated into the calcite structure, substituting the carbonate on a single site (Montes-Hernandez et al, 2011). The possibility of adsorption of selenite on other surface sites has not been ruled out, particularly at high selenium concentrations.…”

Section: Incorporation Of Selenium and Effect On Calcite Growthmentioning

confidence: 94%

Selenium incorporation into calcite and its effect on crystal growth: An atomic force microscopy study

et al. 2013

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Structural study of selenium(IV) substitutions in calcite

Cited by 51 publications

References 34 publications

Comparative study of ageing, heat treatment and accelerated carbonation for stabilization of municipal solid waste incineration bottom ash in view of reducing regulated heavy metal/metalloid leaching

Comparative study of ageing, heat treatment and accelerated carbonation for stabilization of municipal solid waste incineration bottom ash in view of reducing regulated heavy metal/metalloid leaching

A thermodynamic adsorption/entrapment model for selenium(IV) coprecipitation with calcite

Selenium incorporation into calcite and its effect on crystal growth: An atomic force microscopy study

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