An efficient adsorption-strengthening regulation was developed for aluminum-based lithium adsorbents (Li/Al-LDHs) in carbonate-type salt lakes based on reasons for adsorption performance degradation. It was confirmed by adsorption–desorption experiments and density functional theory (DFT) that CO₃²⁻ in brines preferentially entered Li/Al-LDH interlayers with a tighter binding energy to the laminates, resulting in the decreasing sharply cyclic re-adsorption capacity. Intercalated CO₃²⁻ was effectively removed by high concentration of Cl⁻ to enhance Li⁺ re-adsorption, and X-ray absorption spectroscopy (XAS) demonstrated that this process had no impact on the host laminate integrity. On this basis, an innovative strategy of incorporating interlayer anion regulation into lithium extraction process was proposed and employed for the continuous extraction of Li⁺ from carbonate-type brines, bringing about a completely restored re-adsorption capacity with cyclic stability, and the lithium extraction capacity per unit time could be exceeded by about double compared with the conventional process, assuring the efficiency of lithium extraction from carbonate-type brines by Li/Al-LDHs.

中文翻译：

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铝基锂吸附剂在碳酸盐卤水中的吸附弱化机理及调控策略

基于吸附性能下降的原因，针对碳酸盐型盐湖中的铝基锂吸附剂（Li/Al-LDHs）开发了一种有效的吸附强化调节方法。通过吸附-解吸实验和密度泛函理论（DFT）证实，盐水中的CO ₃ ²⁻优先进入Li/Al-LDH夹层，与层合板的结合能更紧密，导致循环重吸附能力急剧下降。高浓度的 Cl ^-可以有效去除插层的 CO ₃ ²⁻以增强 Li ^{+ 的}再吸附，并且 X 射线吸收光谱 (XAS) 表明该过程对主体层压板的完整性没有影响。在此基础上，提出了将层间阴离子调控融入提锂过程的创新策略，并采用该策略从碳酸盐型卤水中连续萃取Li ⁺，实现了具有循环稳定性的完全恢复的再吸附能力，实现了提锂效果。与传统工艺相比，单位时间的产能可提高约一倍，保证了Li/Al-LDHs从碳酸盐型卤水中提取锂的效率。