Selenium Sorption by Kaolinite and Montmorillonite

Bar‐Yosef, B.; Meek, D. W.

doi:10.1097/00010694-198707000-00003

Cited by 145 publications

(97 citation statements)

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“…Thus, the dilution of amorphous Al phases by other constituents present in WTR likely influenced the Se(VI) adsorption signature. In contrast to our findings, Bar-Yosef and Meek [18] showed that at any given concentration Se(VI) adsorption onto kaolinite decreased with increasing pH. Goldberg and Glaubig [17] found that Se(VI) adsorption on a calcareous, montmorillonitic soil did not occur across a pH range of 2-11.…”

Section: Methodscontrasting

confidence: 99%

“…Both minerals showed maximum adsorption at pH 5, with adsorption decreasing with increasing pH. This confirmed similar results for kaolinite and montmorillonite found by Bar-Yosef and Meek [18]. Goldberg and Glaubig [17] also found that selenite adsorption on calcite increased from pH 6-8, was at a maximum between 8 and 9, and decreased at greater pH values.…”

Section: Introductionsupporting

confidence: 86%

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Selenium adsorption to aluminum-based water treatment residuals

Ippolito

Scheckel

Barbarick

2009

Journal of Colloid and Interface Science

105

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a b s t r a c tAluminum-based water treatment residuals (WTR) can adsorb water-and soil-borne P, As(V), As(III), and perchlorate, and may be able to adsorb excess environmental selenium. WTR, clay minerals, and amorphous aluminum hydroxide were shaken for 24 h in selenate or selenite solutions at pH values of 5-9, and then analyzed for selenium content. Selenate and selenite adsorption edges were unaffected across the pH range studied. Selenate adsorbed on to WTR, reference mineral phases, and amorphous aluminum hydroxide occurred as outer sphere complexes (relatively loosely bound), while selenite adsorption was identified as inner-sphere complexation (relatively tightly bound). Selenite sorption to WTR in an anoxic environment reduced Se(IV) to Se(0), and oxidation of Se (0) or Se(IV) appeared irreversible once sorbed to WTR. Al-based WTR could play a favorable role in sequestering excess Se in affected water sources.Published by Elsevier Inc.

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Section: Methodscontrasting

confidence: 99%

Section: Introductionsupporting

confidence: 86%

Selenium adsorption to aluminum-based water treatment residuals

Ippolito

Scheckel

Barbarick

2009

Journal of Colloid and Interface Science

105

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“…Sorption Data from the Literature-Because selenium occurs as anionic species in the surficial environment, its adsorption behavior is controlled primarily by surface-complexation reactions on oxide minerals including iron oxides and oxyhydroxides (Balistrieri and Chao 1987), manganese oxides and oxyhydroxides, clays (Bar-Yosef and Meek 1987), and other minerals with affinities for anionic species. These surface-complexation reactions are quite sensitive to pH.…”

Section: Seleniummentioning

confidence: 99%

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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“…Tetravalent and hexavalent Se are much more soluble and mobile aqueous oxyanions than zero or lower oxidation states Se species . Due to the limitations in physisorption of Se(IV) and Se(VI) on natural minerals (the sorption efficiency is relatively low and the sorption reaches saturation soon), in particular on granite and claystone minerals that are considered as host rock candidates for nuclear waste disposals (Baryosef and Meek, 1987;Guo et al, 2011), reductive precipitation is expected to be the most effective way to immobilize 79 Se.…”

Section: Introductionmentioning

confidence: 99%