High-Crystallinity Titanium Lithium Ion Sieve and Granulated Composite of High Stability and Porosity: Superb Adsorption and Recycling Performance

In this study, high-crystallinity and small-particle-size Li2TiO3 nanocrystals were prepared through the reaction between anatase TiO2 and Li2CO3 in a LiCl molten salt and ethanol medium. The Cl– ions reacted with TiO2 to increase the solubility of TiO2 and strengthen the dissolution–precipitation mechanism for Li2TiO3 preparation. The particle diffusion process was found to be the rate control process for the adsorption of Li+ ions. A porous spherical lithium ion adsorbent named HTO–PVC-PANn was prepared using a phase transformation approach. Polyvinyl chloride (PVC was modified with carboxyl groups as a binder, and poly(acrylonitrile) (PAN) was used as a pore former. The interaction between PVC and HTO and PAN was thus strengthened to improve the adsorbent stability. The developed HTO–PVC-PANn adsorbent shows excellent absorption capabilities, stability, and reduced dissolution loss.