Removal of As(V) by Cu(II)-, Ni(II)-, or Co(II)-doped goethite samples

Mohapatra, Mamata; Sahoo, Saroj Kumar; Anand, S.; Das, R.P.

doi:10.1016/j.jcis.2005.11.052

Cited by 59 publications

(24 citation statements)

References 23 publications

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“…The T-PO precipitate contains larger amounts of Cu, Zn and Ni. The presence of trace metals in the crystalline structure may increase the adsorption of arsenate by 20 -30 %, as already observed for schwertmannite and goethite (Mohapatra et al, 2006;Antelo et al, 2013). The presence of co-precipitated ions and their incorporation in the crystalline structure may lead to changes in the surface properties of the oxides (specific surface area, surface charge and point of zero charge).…”

Section: Arsenate Removal By Amd Precipitatesmentioning

confidence: 70%

Surface Complexation Modelling of Arsenic and Copper Immobilization by Iron Oxide Precipitates Derived from Acid Mine Drainage

Otero-Fariña¹,

Gago²,

Antelo³

et al. 2015

BSGM

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Acid mine drainage (AMD) constitutes a serious environmental problem in mining areas due to the acidification of soils and aquatic systems, and the release of toxic metals. Many of the pollutants that occur in AMD display a high affinity for the surfaces of the aluminium and iron oxides that are typically present in systems affected by AMD. This binding affinity reduces the mobility of trace metals and metalloids, such as copper and arsenic, thus helping to mitigate contamination of aquatic systems. In the present study, water samples and iron-rich bed sediments were collected in areas affected by copper mining activities. A loose ochre-coloured precipitate occurring on the banks of a river close to an abandoned tungsten and tin mine was also sampled. The composition of the precipitate was established, and adsorption experiments were performed with copper and arsenate ions to determine the ability of natural iron precipitates to reduce the concentration of these ions in solution. Surface complexation models provided a good description of the behaviour of natural iron oxides in terms of copper and arsenate retention. Use of this type of model enables prediction of the distribution of pollutants between the solid and solution phases and analysis of their mobility in relation to environmental conditions (pH, ionic strength, presence of competing species, etc.).Keywords: Acid mine drainage, iron oxides, adsorption, trace elements, arsenic, surface complexation model. (pH, fuerza iónica, presencia de especies que compitan, etc.). Resumen El drenaje ácido de mina (AMD) constituye un importante problema ambiental debido a la acidificación y la liberación de metales tóxicos que produce en el suelo y en los sistemas acuáticos próximos a las zonas mineras. Existe una elevada afinidad de muchos de

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Section: Arsenate Removal By Amd Precipitatesmentioning

confidence: 70%

Surface Complexation Modelling of Arsenic and Copper Immobilization by Iron Oxide Precipitates Derived from Acid Mine Drainage

Otero-Fariña¹,

Gago²,

Antelo³

et al. 2015

BSGM

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“…Changing the compositional chemistry of goethite (α-FeOOH) may also affect arsenic sorption. Specifically, the sorption of As(V) may significantly improve if Cu(II), Ni(II), or Co(II) are doped into goethite through coprecipitation (Mohapatra et al, 2006). Besides sorption, As(V) may also be removed from acidic waters through the precipitation of iron arsenates on goethite surfaces (Matis et al, 1999, 301).…”

Section: Zerovalent (Elemental) Ironmentioning

confidence: 99%

Waste Treatment and Remediation Technologies for Arsenic

Henke

2009

Arsenic

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“…The changes in surface area and pore volume of Pb-doped goethite seem to be due to the larger ionic radius of Pb 2+ ion as compared to Fe 3+ ion. The difference in ionic radii of Pb 2+ [r(Pb 2+ ) = 1.19 Å ] and Fe 3+ [r(Fe 3+ ) = 0.645 Å ] is about 0.545 Å , which causes local contraction/expansion in the edges and corners of the crystal planes of goethite, hence affecting its surface area and pore volume [1,17].…”

Section: Characterizationmentioning

confidence: 99%

“…They suggested that the increase in adsorption ability of doped goethite sample was due to its relatively larger surface area. Similarly Mohapatra et al [17] investigated the adsorption of As(V) by Cu(II)-, Ni(II)-, or Co(II)-doped goethite and found that surface area and adsorption capacity of goethite increases with metal ions doping in it. They concluded that the increases in adsorption of As(V) is not solely related to the increase in surface area but the nature of the doped ion and structure also affects the adsorption behavior the adsorbent.…”

Section: Introductionmentioning

confidence: 99%