Sorption of nickel ontogoethite (α-FeOOH) and desorption kinetics of aged synthetic Ni-goethite: Implication for Ni laterite ore

Irreversible Trace Metal Binding to Goethite Controlled by the Ion Size

“…X-ray Absorption Near Edge Structure (XANES) Spectroscopy. Since past studies have suggested that a large nonrecoverable fraction may be present for Ni after aging with goethite, 16,22 a sample was prepared to determine whether the possible residual Ni pool was trapped as an adsorbed phase, incorporated into the goethite structure, or present as a surface precipitate. A wet paste of goethite solids aged for 60 days with 200 μM Ni was collected via vacuum filtration and placed in 2% nitric acid for 24 h to remove the adsorbed pool.…”

“…X-ray Absorption Near Edge Structure (XANES) Spectroscopy. Since past studies have suggested that a large nonrecoverable fraction may be present for Ni after aging with goethite, 16,22 filtration and placed between 2 layers of Kapton tape. X-ray photoelectron spectroscopy (XPS) was used to confirm that the adsorbed pool had been removed (Figure S4).…”

“…Several studies have found that metal cations show adsorption–desorption hysteresis after aging with iron (oxhydr)­oxides. − For example, a study of Cd, Zn, and Ni adsorption at the goethite surface found that there was a strongly bound fraction (10.5, 29, and 39%, respectively) that could only be recovered by complete hydrofluoric acid dissolution of goethite . Similarly, after 4 months of aging with hydrous ferric oxide, about 50% of the Co, 20% of the Cd, and 0% of the Pb were unrecoverable via desorption .…”

“…Hydrated radii influence rates of mass transfer in diffusive domains while ionic radii influence chemical bonding processes. Goethite was selected as a mineral for this study as it is one of the most thermodynamically stable iron (oxyhydr)­oxides for which trace metal adsorption–desorption hysteresis has been well documented. − It is also a widely abundant and predominant reactive phase in soils and sediments . Goethite suspensions were aged with dissolved Ni, Zn, or Cd.…”

Nickel mass balance and isotopic records in a serpentinic weathering profile: Implications on the continental Ni budget

“…The genesis of laterite Ni-deposits in tropical conditions has been extensively investigated in Brazil (Colin et al, 1990;Silva and Oliveira, 1995;Ratié et al, 2018), Colombia (Gleeson, et al, 2004), Indonesia (Fu et al, 2014;Fan and Gerson, 2015), Cuba and the Dominican Republic (Gleeson et al, 2004;Aiglsperger et al, 2016;Domènech et al, 2022), New Caledonia (Dublet et al, 2012;Ulrich et al, 2019), Philippines (Tupaz et al, 2020;, and Myanmar (Sun et al, 2022). During weathering, Ni is relatively soluble and may be strongly adsorbed, incorporated, and coprecipitated into Mn and Fe oxyhydroxides in the upper layer, which are rich in goethite, hematite, and Mn oxides (Elias, 2002;Freyssinet et al, 2005;Golightly, 2010;Dublet et al, 2012;Butt and Cluzel, 2013;Ugwu et al, 2019). Part of the Ni is then leached from the overlying oxide zone and incorporated into the underlying hydrous silicate saprolite layer rich in garnet minerals (Nibearing serpentines, chlorites, and talc) (Elias, 2002;Gleeson et al, 2004;Villanova-de-Benavent et al, 2017).…”