Copper and arsenate co-sorption at the mineral–water interfaces of goethite and jarosite

Recent progress of arsenic adsorption on TiO 2 in the presence of coexisting ions: A review

“…3). Though extensive studies have been motivated to investigate the interaction of cationic metals and anionic ligands on metal oxide surfaces (Grafe et al, 2004(Grafe et al, , 2008Jiang et al, 2013;Ler and Stanforth, 2003), the molecular-level interactions between cationic Cd and neutrally charged As(III) on the TiO 2 surface are poorly understood.…”

“…The synergistic adsorption of As and Cd on TiO 2 via the formation of ternary surface complexes and surface precipitates further inhibited the metal release into the aqueous phase, contributing to its immobilization (Grafe et al, 2004(Grafe et al, , 2008Jiang et al, 2013). Though much effort was put into studying the synergetic uptake mechanism of As adsorption on metal oxide surfaces with the influence of coexisting heavy metals, the results may be a case-by-case study due to the complicated contamination species and various solid-water interfaces.…”

Molecular Insights into Ternary Surface Complexation of Arsenite and Cadmium on TiO2

“…11−14 However, no clear boundaries exist distinguishing ternary surface complexes and surface precipitation, and these two terms sometimes are even used interchangeably. 12 For example, surface precipitation was used to describe elevated As(V) removal in the presence of Zn 11 and Cu 15 on goethite. On the other hand, more recent reports use ternary surface complexation to describe the co-adsorption of cations and anions on a surface where the newly formed cation−anion solid phase does not grow beyond monolayer coverage.…”

“…17 In addition, SO 4 anions could form ternary surface complexes with Pb, Cu, and Zn on goethite, 9,14 ferrihydrite, and schwertmannite. 18 Although metal−As(V) ternary complexes on surfaces are wellknown, 11,15,19 limited reports are available on metal−As(III) mutual effects on surfaces. 19 The objective of this study was to explore the molecular-scale interactions of As(III) and Cd on TiO 2 surfaces.…”

Arsenate and cadmium co-adsorption and co-precipitation on goethite

“…Conversely, oxyanion adsorption amount may not be increased by metal cations [15,17,18]. A series of studies using EXAFS spectroscopy explored the coordination environment of Zn/Cu and As(V) co-adsorption and co-precipitation on goethite [4,19,20], suggested that metals with high propensity to precipitate with AsO 4 3− could be used to remove As(V) from contaminated waters. To date, understanding on co-sorption of metal-oxyanions and its potential applications is still limited.…”