Cation Exchange and Sorption Properties of Crystalline α-Titanium(IV) Phosphate

Sorption performances of TiO(OH)(H2PO4)·H2O in synthetic and mine waters

“…Practically, it has also shown to be a very efficient sorbent for alkali-earth ions (Ca 2+ , Mg 2+ and Sr 2+ ) where aTiP had a mild effect on water content (as seen in Table 4); (ii) it can act in a pH range of 4-7 where the aTiP activity at ca. pH 6 is already less than 50% of the expected exchange capacity of 0.5-0.7 mmol g À1 (as also seen in the titration curves in Sahu et al 21 ); (iii) it has a higher chemical stability, does not considerably change its structure at elevated temperatures and can be easily obtained in amorphous form.…”

“…, which is substantially higher than the areas reported for various titanium phosphate sorbents. 10,12,21,27,39 90% of this surface area is an external surface area which, combined with the mesoporous net of interconnected spaces, ensures the possibility of multiple ways of sorption. Thermodynamically, the H + /Na + exchange has been studied only on alpha-TiP.…”

“…on sorbents containing -HPO 4 functional units. 4,10,13,17,21,[23][24][25] Reports on sorption of transition metals ions on -H 2 PO 4 based TiP-IE have been scarce and mostly related to the Ti 2 O 3 (H 2 PO 4 )$ 2H 2 O sorbent. The Temkin approach has not been explored for modeling the sorption processes on Ti-IE.…”

Adsorption of Pb2+, Zn2+, and Cd2+ from waters by amorphous titanium phosphate

“…There are numerous reports on ion-exchange properties of different M(HPO 4 ) 2 with alkali or alkaline earth metal ions in aqueous solution [13,14]. However, little is known about their ion-exchange properties in the presence of aqueous heavy metal ions [15,16].…”

Long-term phosphorus effects on evolving physicochemical properties of iron and aluminum hydroxides

“…Phosphorus-treated Al and Fe hydroxides have attracted much attention as catalysts, or ion exchangers for heavy metals [2]. Aluminum phosphates have also been used to remove heavy metals (Co, Ni, and Cu) from aqueous solutions [3].…”