A real time in situ ATR-FTIR spectroscopic study of linear phosphate adsorption on titania surfaces

Adsorption to goethite of extracellular polymeric substances from Bacillus subtilis

“…6b-e (absent in Fig. 6a), that are consistent with stretching vibrations of P-O-Fe bonds as indicated by both empirical and molecular modeling studies (Tejedor-Tejedor and Anderson, 1990;Barja et al, 1999;Gong, 2001;Sheals et al, 2002;. Emergence of these two new bands and the associated shifts in m as PO 2 À and m s PO 2 À are consistent with inner-sphere bonding of EPS phosphate groups (deriving principally from phosphodiesters of nucleic acids and proteins) at goethite surface hydroxyls.…”

Enhanced removal of triphosphate by MgCaFe-Cl-LDH: Synergism of precipitation with intercalation and surface uptake

“…It is our belief that Ca 2 FeCl-LDH is partially dissolved, releasing Ca 2+ in a certain concentration. The released Ca 2+ react with TPP to form amorphous Ca-TPP precipitate, as reported elsewhere [29]. However, TPP is mainly taken up by Mg 2 FeCl-LDH through exchanging the surface and near-edge Cl − .…”

Quantifying effects of pH and surface loading on arsenic adsorption on NanoActive alumina using a speciation-based model

“…With the similarities of phosphate and arsenate, the band assignment of adsorbed As(V) spectra was comparable to that of (MO) 2 PO 2 surface complexes having C 2v symmetry [37][38][39][40]. Because metal ions are not as strongly coordinated to oxygen ions as protons are [37][38][39]41], the As-OAl bond should be stronger than As-OH. Thus, the uncomplexed As-O bond in (AlO) 2 AsO 2 should be weaker than that in (HO) 2 AsO 2 − , and the uncomplexed As-O bond in (AlO)AsO 3 − should be weaker than that in (HO)AsO 3 2− .…”