Impregnation of .gamma.-Alumina with Ni(II) or Co(II) Ions at Neutral pH: Hydrotalcite-Type Coprecipitate Formation and Characterization

Caillerie, Jean-Baptiste d’Espinose de la; Kermarec, M.; Clause, O.

doi:10.1021/ja00151a010

Cited by 182 publications

(164 citation statements)

References 2 publications

Supporting

Mentioning

149

Contrasting

Order By: Relevance

“…For example, Trainor et al (2000) observed the formation of (Zn,Al)-hydrotalcite upon Zn sorption on alumina in conditions of undersaturation with respect to the homogeneous precipitation of Zn solids, and similar results were obtained with nickel and cobalt on the same or other Alcontaining substrates (Espinose De La Caillerie et al, 1995;Scheidegger et al, 1997;Scheckel et al, 2000;Elzinga and Sparks, 2001). This phenomenon can be rationalized by considering that the activity of Al is higher in the immediate vicinity of an aluminous solid and,…”

Section: Thermodynamic Stability Ofmentioning

confidence: 55%

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Panfili

Manceau

Sarret

et al. 2005

Geochimica et Cosmochimica Acta

122

129

View full text Add to dashboard Cite

Running Title: Effect of phytostabilzation on Zn speciation in dredged sediment 2 ABSTRACTThe maintenance of waterways generates large amounts of dredged sediments, which are deposited on adjacent land surfaces. These sediments are often rich in metal contaminants and present a risk to the local environment. Understanding how the metals are immobilized at the molecular level is critical for formulating effective metal containment strategies, such as phytoremediation. In the present work, the mineralogical transformations of Zn Seven Zn species were identified at the micrometer-scale : sphalerite, gahnite, franklinite, Zncontaining ferrihydrite and phosphate, (Zn-Al)-hydrotalcite, and Zn-substituted, kerolite-like, trioctahedral phyllosilicate. Bulk fractions of each species were quantified by LSF of the powder EXAFS spectra to linear combinations of the identified Zn species spectra.In the untreated and unvegetated sediment, Zn was distributed as ~50 % (mole ratio of total Zn) sphalerite, ~40 % Zn-ferrihydrite, and ~10-20 % (Zn-Al)-hydrotalcite plus Znphyllosilicate. In unvegetated but amended sediments (AP and TS), ZnS and Zn-ferrihydrite each decreased by 10 to 20 % and were replaced by Zn-phosphate (~30-40 %). In the presence of plants, ZnS was almost completely dissolved and the released Zn bound to phosphate (~40-60 %) and to Zn phyllosilicate plus (Zn,Al)-hydrotalcite (~20-40 %). Neither the plant species 3 nor the co-addition of mineral amendment affected the Zn speciation in the vegetated sediment.The sediment pore waters were supersaturated with respect to Zn-containing trioctahedral phyllosilicate, near-saturation with respect to Zn-phosphate, and strongly undersaturated with respect to (Zn,Al)-hydrotalcite. Therefore, the formation of (Zn,Al)-hydrotalcite in slightly alkaline conditions ought to result from heterogenous precipitation on mineral surface. 4

show abstract

Section: Thermodynamic Stability Ofmentioning

confidence: 55%

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Panfili

Manceau

Sarret

et al. 2005

Geochimica et Cosmochimica Acta

122

129

View full text Add to dashboard Cite

show abstract

“…Several laboratory studies of metal ion partitioning identify the precipitation of mixed metal hydroxides known as hydrotalcites as a significant uptake route for metal ions (d'Espinose de la Caillerie et al, 1995;Scheidegger et al, 1997;Towle et al, 1997;Thompson et al, 1999). Although precipitation was shown to (001) showing hydroxide layers (top, middle, and bottom) interlayered with O atoms from hydration water.…”

Section: Introductionmentioning

confidence: 99%

Ambient-Temperature Synthesis, Evolution, and Characterization of Cobalt-Aluminum Hydrotalcite-Like Solids

Thompson

1999

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--Double hydroxide solids precipitated homogeneously from three laboratory-synthesized aqueous solutions that simulated mildly contaminated surface or groundwater. Over a limited pH range, precipitates formed rapidly from dissolved ions, and more slowly by incorporating ions dissolving from other solids, including highly soluble aluminous solids. The precipitates were characterized by size and shape via transmission electron microscopy (TEM), by composition via inductively coupled plasma-mass spectrometry (ICP-MS) of mother solutions and analytical electron microscopy (AEM) of precipitates, and by structure via powder X-ray diffraction (XRD), TEM, and extended X-ray absorption fine structure (EXAFS) spectroscopy. They were identified as nanocrystalline cobalt hydrotalcite (CoHT) of the form [Co(II)1 xAl(III)x(OH)~]x+(A " ~/n).mH20, with x = 0.17-0.25, A = CO32 , NO3-, or H3SiO 4 , n = anion charge and m undetermined. Complete solid solution may exist at the macroscopic level for the range of stoichiometries reported, but clustering of Co atoms within hydroxide layers indicates a degree of immiscibility at the molecular scale. Composition evolved toward the Co-rich endmember with time for at least one precipitate. The small layer charge in the x = 0.17 precipitate caused anionic interlayers to be incomplete, producing interstratification of hydrotalcite and brucite-like layers. Solubility products estimated from solution measurements for the observed final CoHT stoichiometries suggest that CoHT is less soluble than the inactive forms of Co(OH)2 and COCO3 near neutral pH. Low solubility and rapid formation suggest that CoHT solids may be important sinks for Co in contact with near neutral pH waters. Because hydrotalcite can incorporate a range of transition metals, precipitation of hydrotalcite may be similarly effective for removing other trace metals from natural waters.

show abstract

“…Examples include weathering and soil formation, formation of clays and iron oxides, nutrient and trace metal fate and bioavailability, carbon sequestration, acid mine drainage, soil permeability, redox reactions and precipitation processes for environmental remediation [1][2][3][4][5][6][7][8] . A molecular-scale understanding of the kinetics and reactions of metal adsorption at the mineral surface is critical not only to geochemical processes but also to colloid chemistry, corrosion science, materials science and in the preparation/manufacture of heterogeneous catalysts [9][10][11][12] . Newly formed surface precipitates, such as hydrotalcite-type layered double-metal hydroxides (LDHs), which form at the mineral-water interface, have versatile roles in important environmental reactions.…”

mentioning

confidence: 99%

“…Anions and water molecules are located in between the layers 2,11,13,14 . They can immobilize trace metals in soils, decrease metal bioavailability, control the concentrations of metal contaminants in natural waters and improve design calculations for the geologic storage of contaminated waste; in addition, they are thermodynamically more stable than single-metal hydroxides 2,11,[15][16][17] . LDHs have a variety of applications including adsorbents, anion scavengers, anion exchangers, polymer stabilizers and nanoreactors 14 .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Real-time QEXAFS spectroscopy measures rapid precipitate formation at the mineral–water interface

Siebecker

Khalid

et al. 2014

Nat Commun

View full text Add to dashboard Cite

Reactions at the mineral-water interface are central to numerous geochemical processes and have consequences at local, regional and global scales. They are also important in materials science research. Kinetics greatly influences mineral-water interface reactions; however, there are few kinetic data in real-time and at the molecular scale. Here we report real-time data illustrating the rapid formation of nickel aluminium-layered double hydroxide precipitates at the mineral-water interface in a flow environment in as little as 31-40 min. Layered double hydroxides have a variety of applications in environmental remediation and materials science. The real-time data shown here enhance our fundamental understanding of the kinetics of mineral-water interface processes, such as adsorption, dissolution and precipitation, by illustrating their rapid and simultaneous occurrence in a dynamic environment. Both precipitation and adsorption can occur on the same rapid timescale.

show abstract

Impregnation of .gamma.-Alumina with Ni(II) or Co(II) Ions at Neutral pH: Hydrotalcite-Type Coprecipitate Formation and Characterization

Cited by 182 publications

References 2 publications

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

The effect of phytostabilization on Zn speciation in a dredged contaminated sediment using scanning electron microscopy, X-ray fluorescence, EXAFS spectroscopy, and principal components analysis

Ambient-Temperature Synthesis, Evolution, and Characterization of Cobalt-Aluminum Hydrotalcite-Like Solids

Real-time QEXAFS spectroscopy measures rapid precipitate formation at the mineral–water interface

Contact Info

Product

Resources

About