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In situ incorporation of arsenic, molybdenum, and selenium during precipitation of hydrotalcite-like layered double hydroxides
Abstract Magnesium (Mg2+) and iron (Fe3+) are common cations and their precipitation as MgFeCO3-type hydrotalcite-like layered double hydroxide (HTlc) may influence contaminant mobilization in, for example, mine drainage sites. The extent of As(V), Mo(VI), and Se(VI) incorporation during HTlc precipitation in alkaline media under normal atmospheric conditions was evaluated and its effect on physico-chemical properties was examined. Even after solute entrapment, the HTlcs were characterized by strong agglomeration. The affinity for solute inclusion in the HTlcs varied in the order As(V)>Mo(VI)>Se(VI). The incorporation of solutes resulted in slight decreases in interlayer thickness, degree of crystallinity, and crystallite size compared to the solute-free MgFeCO3-type HTlc. Open air conditions allowed a substantial mass of CO3 2− to occupy the HTlc interlayer together with the metal(loid)ic oxyanions. The incorporation of As(V), Mo(VI), and Se(VI) into the HTlcs resulted in the addition of Raman spectral vibrations at ~810, ~898, and ~835cm−1, respectively. With solute incorporation, additional mass loss occurred in multiple stages upon heating; however, the thermal stability of the solute-incorporated HTlcs was unchanged compared to solute-free counterpart. Additional surface absorption of H2O and structural incorporation of CO3 2− were evident in the solute-incorporated HTlcs.
Highlights Strong agglomerated cohesive morphology even after solute entrapment Solute entrapment trend varied as As(V)>Mo(VI)>Se(VI). Partial interlayer occupancy of solutes together with CO3 2− from atmospheric CO2 Excess mass loss upon solute entrapment without affecting thermal stability Lowering of degree of crystallinity and interlayer thickness upon solute entrapment
In situ incorporation of arsenic, molybdenum, and selenium during precipitation of hydrotalcite-like layered double hydroxides
Abstract Magnesium (Mg2+) and iron (Fe3+) are common cations and their precipitation as MgFeCO3-type hydrotalcite-like layered double hydroxide (HTlc) may influence contaminant mobilization in, for example, mine drainage sites. The extent of As(V), Mo(VI), and Se(VI) incorporation during HTlc precipitation in alkaline media under normal atmospheric conditions was evaluated and its effect on physico-chemical properties was examined. Even after solute entrapment, the HTlcs were characterized by strong agglomeration. The affinity for solute inclusion in the HTlcs varied in the order As(V)>Mo(VI)>Se(VI). The incorporation of solutes resulted in slight decreases in interlayer thickness, degree of crystallinity, and crystallite size compared to the solute-free MgFeCO3-type HTlc. Open air conditions allowed a substantial mass of CO3 2− to occupy the HTlc interlayer together with the metal(loid)ic oxyanions. The incorporation of As(V), Mo(VI), and Se(VI) into the HTlcs resulted in the addition of Raman spectral vibrations at ~810, ~898, and ~835cm−1, respectively. With solute incorporation, additional mass loss occurred in multiple stages upon heating; however, the thermal stability of the solute-incorporated HTlcs was unchanged compared to solute-free counterpart. Additional surface absorption of H2O and structural incorporation of CO3 2− were evident in the solute-incorporated HTlcs.
Highlights Strong agglomerated cohesive morphology even after solute entrapment Solute entrapment trend varied as As(V)>Mo(VI)>Se(VI). Partial interlayer occupancy of solutes together with CO3 2− from atmospheric CO2 Excess mass loss upon solute entrapment without affecting thermal stability Lowering of degree of crystallinity and interlayer thickness upon solute entrapment
In situ incorporation of arsenic, molybdenum, and selenium during precipitation of hydrotalcite-like layered double hydroxides
Paikaray, Susanta (author) / Hendry, M. Jim (author)
Applied Clay Science ; 77-78 ; 33-39
2013-03-18
7 pages
Article (Journal)
Electronic Resource
English
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