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<p>Titanium lithium ion sieve (Ti-LIS) has attracted much attention due to their excellent adsorption properties and easy preparation process. In this study, the Li<sub>2</sub>TiO<sub>3</sub> with different doping amounts of W (LTWO) was synthesized by the hydrothermal method. Then, the LTWO was washed with HCl to obtain the adsorbent of W-doped H<sub>2</sub>TiO<sub>3</sub> (HTWO). The structure and adsorption properties of HTWO-4 were tested and the results showed that the introduction of W into HTWO leads to lattice defects, which increase oxygen vacancies and promote Li<sup>+</sup> diffusion in the adsorbent. The effects of adsorption time, initial Li⁺ concentration, and pH on the adsorption properties of Li⁺ were systematically evaluated. The adsorption process of HTWO was confirmed as chemisorption and monolayer adsorption by simulating the pseudo-second-order kinetic model and Langmuir model. Among them, HTWO-4 exhibits a higher adsorption capacity than others, with a value of 34.68&#xa0;mg/g in a LiCl solution (Li<sup>+</sup>  = 210 mg/L). Additionally, the HTWO-4 exhibits superior adsorption selectivity of Li<sup>+</sup> over Mg<sup>2+</sup>, Ca<sup>2+</sup>, K<sup>+</sup>, and Na<sup>+</sup>, maintaining a high Li<sup>+</sup> adsorption capacity after five regeneration cycles. This work provides an ideal candidate adsorbent in the field of lithium resource utilization.</p>

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Preparation of W-doped titanium lithium ion sieve by hydrothermal method and enhanced adsorption performance for Li+

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Mingdong Wu,
  • Shengyu Wang,
  • Minghong Jiang,
  • Zhaoxing Lei,
  • Shanxin Xiong,
  • Jia Chu

摘要

Titanium lithium ion sieve (Ti-LIS) has attracted much attention due to their excellent adsorption properties and easy preparation process. In this study, the Li2TiO3 with different doping amounts of W (LTWO) was synthesized by the hydrothermal method. Then, the LTWO was washed with HCl to obtain the adsorbent of W-doped H2TiO3 (HTWO). The structure and adsorption properties of HTWO-4 were tested and the results showed that the introduction of W into HTWO leads to lattice defects, which increase oxygen vacancies and promote Li+ diffusion in the adsorbent. The effects of adsorption time, initial Li⁺ concentration, and pH on the adsorption properties of Li⁺ were systematically evaluated. The adsorption process of HTWO was confirmed as chemisorption and monolayer adsorption by simulating the pseudo-second-order kinetic model and Langmuir model. Among them, HTWO-4 exhibits a higher adsorption capacity than others, with a value of 34.68 mg/g in a LiCl solution (Li+  = 210 mg/L). Additionally, the HTWO-4 exhibits superior adsorption selectivity of Li+ over Mg2+, Ca2+, K+, and Na+, maintaining a high Li+ adsorption capacity after five regeneration cycles. This work provides an ideal candidate adsorbent in the field of lithium resource utilization.