Immobilization of Ni by Al-modified montmorillonite: A novel uptake mechanism

RETRACTED: Competitive sorption and selective sequence of Cu(II) and Ni(II) on montmorillonite: Batch, modeling, EPR and XAS studies

“…Therefore, a series of studies have been performed to investigate the sorption behaviors of Cu (II) and Ni(II) on montmorillonite. In addition, some spectral analysis techniques such as the electron paramagnetic resonance (EPR) and X-ray Absorption Spectroscopy (XAS) have also been applied to deduce the underlying sorption mechanisms (Hyun et al, 2000;Morton et al, 2001;Dähn et al, 2002Dähn et al, , 2003Undabeytia et al, 2002;Strawn et al, 2004;Nachtegaal et al, 2005;Tan et al, 2011;Schlegel and Manceau, 2013). Generally, Cu(II) and Ni(II) tend to be adsorbed via ion exchange reaction over the acidic pH range and surface complexation over the near-neutral pH range.…”

Changes in Zn speciation during soil formation from Zn-rich limestones

“…These phases were previously identified in a series of soils contaminated by different forms of Zn, including smelter and foundry emissions or dredged sediments (Juillot et al, 2003;Manceau et al, 2000a;Nachtegaal et al, 2005;Panfili et al, 2005;Voegelin et al, 2005b;Kirpichtchikova et al, 2006). Factors favoring the formation of these phases were higher soil pH and higher Zn concentrations (Jacquat et al, , 2009b).…”

“…Studies on the sorption and speciation of Zn in metal oxide and clay mineral suspensions demonstrated its versatile reactivity and suggested that the formation of layered precipitates such as hydroxides, layered double hydroxides (LDH) or phyllosilicates may be an important sequestration mechanism in contaminated soils at near-neutral to alkaline pH (Ford and Sparks, 2000;Schlegel et al, 2001;Roberts et al, 2003). Spectroscopic studies on the speciation of Zn in soils contaminated over years to decades confirmed the formation and relevance of Zn-phyllosilicate-and Zn-LDH-type precipitates under field conditions (Manceau et al, 2000a;Juillot et al, 2003;Nachtegaal et al, 2005;Panfili et al, 2005;Voegelin et al, 2005b;Kirpichtchikova et al, 2006). In calcareous soils, both Zn-LDH and Zn-phyllosilicate were identified, 0016-7037/$ -see front matter Ó 2009 Elsevier Ltd. All rights reserved.…”

Minerals as Molecules—Use of Aqueous Oxide and Hydroxide Clusters to Understand Geochemical Reactions

“…The aluminum hydroxide clusters, in constrast, are found in nature and used to mitigate pollution. [27,[116][117][118][119][120] Ferric hydroxide structures: More is known about reactions on aluminum clusters than transition-metal clusters because 27 Al NMR spectroscopy can be used to ascertain the mono- Figure 9. Several aluminum hydroxide cations have been isolated and used in kinetic studies, [3,4] including [AlO 4 Al 12 (OH) 24 …”