Synthesis of H2TiO3-PVC lithium-ion sieves via an antisolvent method and its adsorption performance
H 2 TiO 3 is the most promising and highly selective lithium-ion sieve. In this study, HTO-PVC- x ( x = 10, 15, 20, 25, and 30) lithium-ion sieves were prepared via an antisolvent method using PVC as the matrix. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that Li 2 TiO 3 was preferentially indexed to a C 2/ c monoclinic structure. LTO-PVC- x had a spherical size of 300 μm and an enormous specific surface area. The morphology and size of HTO-PVC- x obtained by HCl elution were consistent with those of LTO-PVC- x , indicating good separation and recycling properties. HTO-PVC-15 had a higher adsorption performance and adsorption capacity at a lower initial Li + concentration. The adsorption behaviour of HTO-PVC-15 is in accordance with the Langmuir isothermal model and pseudo-second-order model, which belongs to the chemical adsorption process . It reached 96% of its equilibrium adsorption capacity within 2 h. Simultaneously, it maintained high adsorption selectivity and cycling performance and a low Ti 4+ dissolution rate. Thus, HTO-PVC-15 has immense potential to be used for salt lake brine adsorption applications.
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