|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Lithium adsorption mechanism for H2TiO3
||Raja Shekhar Marthi, York Reed Smith
|On-Site Speaker (Planned)
||Raja Shekhar Marthi
Layered H2TiO3 has shown promising selective lithium adsorption properties in lithium enriched brine solutions. However, the lithium adsorption mechanism of layered H2TiO3 is still not properly understood. It is currently accepted that lithium adsorption takes place via Li+-H+ ion exchange reaction without involving any breakage of chemical bonds. However, in this study we show that Li+- H+ ion exchange involves breaking of surface O-H bonds present in the HTi2 layers along with the formation of O-Li bonds. Using FTIR and Raman spectroscopy, we also show that the isolated surface hydroxyls are actively involved in lithium ion-exchange compared to hydrogen bonded surface hydroxyl groups, which are present in the interlayer spacings. This new proposed mechanism also explains the lower observed adsorption capacity from theoretical values.