Oxyanion behavior in alkaline environments: Sorption and desorption of arsenate in ettringite

Satish Chandra Babu Myneni; Samuel J. Traina; Terry J. Logan; Glenn A. Waychunas

doi:10.1021/es9607594

Oxyanion behavior in alkaline environments: Sorption and desorption of arsenate in ettringite

Satish Chandra Babu Myneni, Samuel J. Traina, Terry J. Logan, Glenn A. Waychunas

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130 Scopus citations

Abstract

Arsenate sorption by ettringite [Ca₆,Al₂(SO₄)₃(OH)₁₂·26H₂O] is examined as adsorption and coprecipitation systems st alkaline pH (10.0- 12.5) and for a wide range of As(V) concentration (<1 μM-15 mM). The mode of sorption and sorbate and sorbent concentrations controlled the nature of solid-phase As(V) speciation. Although high pH increased ettringite stability in concentrated As(V) solutions, it did not influence total As(V) sorption. During adsorption, ettringite exposure to concentrated As(V) solutions (>2.0 mM) precipitated new unidentified microcrystalline minerals at the expense of ettringite. Concentrated As(V) solution exposure to coprecipitating ettringite poisoned ettringite crystal growth, with precipitation of some microcrystalline minerals. Sorbed As(V) was also not desorbable in the presence of concentrated sulfate and high ionic strength solutions. Details of As(V) adsorption and coprecipitation systems and inferences on As(V) molecular interactions are proposed.

Original language	English (US)
Pages (from-to)	1761-1768
Number of pages	8
Journal	Environmental Science and Technology
Volume	31
Issue number	6
DOIs	https://doi.org/10.1021/es9607594
State	Published - Jun 1997

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General Chemistry
Environmental Chemistry

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title = "Oxyanion behavior in alkaline environments: Sorption and desorption of arsenate in ettringite",

abstract = "Arsenate sorption by ettringite [Ca6,Al2(SO4)3(OH)12·26H2O] is examined as adsorption and coprecipitation systems st alkaline pH (10.0- 12.5) and for a wide range of As(V) concentration (<1 μM-15 mM). The mode of sorption and sorbate and sorbent concentrations controlled the nature of solid-phase As(V) speciation. Although high pH increased ettringite stability in concentrated As(V) solutions, it did not influence total As(V) sorption. During adsorption, ettringite exposure to concentrated As(V) solutions (>2.0 mM) precipitated new unidentified microcrystalline minerals at the expense of ettringite. Concentrated As(V) solution exposure to coprecipitating ettringite poisoned ettringite crystal growth, with precipitation of some microcrystalline minerals. Sorbed As(V) was also not desorbable in the presence of concentrated sulfate and high ionic strength solutions. Details of As(V) adsorption and coprecipitation systems and inferences on As(V) molecular interactions are proposed.",

author = "Myneni, {Satish Chandra Babu} and Traina, {Samuel J.} and Logan, {Terry J.} and Waychunas, {Glenn A.}",

year = "1997",

month = jun,

doi = "10.1021/es9607594",

language = "English (US)",

volume = "31",

pages = "1761--1768",

journal = "Environmental Science and Technology",

issn = "0013-936X",

publisher = "American Chemical Society",

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AU - Myneni, Satish Chandra Babu

AU - Traina, Samuel J.

AU - Logan, Terry J.

AU - Waychunas, Glenn A.

PY - 1997/6

Y1 - 1997/6

N2 - Arsenate sorption by ettringite [Ca6,Al2(SO4)3(OH)12·26H2O] is examined as adsorption and coprecipitation systems st alkaline pH (10.0- 12.5) and for a wide range of As(V) concentration (<1 μM-15 mM). The mode of sorption and sorbate and sorbent concentrations controlled the nature of solid-phase As(V) speciation. Although high pH increased ettringite stability in concentrated As(V) solutions, it did not influence total As(V) sorption. During adsorption, ettringite exposure to concentrated As(V) solutions (>2.0 mM) precipitated new unidentified microcrystalline minerals at the expense of ettringite. Concentrated As(V) solution exposure to coprecipitating ettringite poisoned ettringite crystal growth, with precipitation of some microcrystalline minerals. Sorbed As(V) was also not desorbable in the presence of concentrated sulfate and high ionic strength solutions. Details of As(V) adsorption and coprecipitation systems and inferences on As(V) molecular interactions are proposed.

AB - Arsenate sorption by ettringite [Ca6,Al2(SO4)3(OH)12·26H2O] is examined as adsorption and coprecipitation systems st alkaline pH (10.0- 12.5) and for a wide range of As(V) concentration (<1 μM-15 mM). The mode of sorption and sorbate and sorbent concentrations controlled the nature of solid-phase As(V) speciation. Although high pH increased ettringite stability in concentrated As(V) solutions, it did not influence total As(V) sorption. During adsorption, ettringite exposure to concentrated As(V) solutions (>2.0 mM) precipitated new unidentified microcrystalline minerals at the expense of ettringite. Concentrated As(V) solution exposure to coprecipitating ettringite poisoned ettringite crystal growth, with precipitation of some microcrystalline minerals. Sorbed As(V) was also not desorbable in the presence of concentrated sulfate and high ionic strength solutions. Details of As(V) adsorption and coprecipitation systems and inferences on As(V) molecular interactions are proposed.

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JO - Environmental Science and Technology

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Oxyanion behavior in alkaline environments: Sorption and desorption of arsenate in ettringite

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