The efficient recovery of lithium from the alkaline mother liquor with high Na/Li ratios after Li2CO3 precipitation by adsorption has received extensive attention. However, synthesizing composite adsorbents with excellent adsorption capacity and rate still faces huge challenges. In this work, we synthesized a novel Co-doped Li2TiO3 lithium ion sieve (LTO-1/32Co) using the calcination method. After converting to Co-doped H2TiO3 (HTO-1/32Co) by pickling, the adsorption capacity of the material was 1.4 times higher than that of conventional H2TiO3. To realize the industrial application of the powdered HTO-1/32Co, it was coated with polysulfone (PSF) by the wet spinning method. The saturated adsorption capacity of the material could reach 60.79 mg·g−1, which was at the forefront of reported composite adsorbents. When the adsorbent was applied for lithium recovery from lithium precipitation mother liquor, the adsorption capacity could reach 40.12 mg·g−1, and the equilibrium time was only 50 min. The elution rate of Li+ could be maintained at 90.56 % with the dissolution loss of Ti no more than 0.43 % after six cycles. The developed fibrous composite adsorbent exhibits excellent adsorption/desorption performance and cyclic stability, making it a competitive candidate for efficient lithium recovery from lithium precipitation mother liquor and other lithium-rich alkaline brine resources.

中文翻译：

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一种新型钴掺杂 H2TiO3 纺丝复合材料，用于从碱性锂沉淀母液中高效回收锂


通过吸附沉淀Li2CO3后从高Na/Li比碱性母液中高效回收锂受到了广泛关注。然而，合成具有优异吸附容量和速率的复合吸附剂仍面临巨大挑战。在这项工作中，我们采用煅烧方法合成了一种新型Co掺杂Li2TiO3锂离子筛（LTO-1/32Co）。通过酸洗转化为Co掺杂H2TiO3（HTO-1/32Co）后，该材料的吸附容量比传统H2TiO3提高了1.4倍。为了实现粉末状HTO-1/32Co的工业化应用，采用湿法纺丝方法对其进行聚砜（PSF）包覆。该材料的饱和吸附容量可达60.79 mg·g−1，处于已报道的复合吸附剂的前列。将吸附剂应用于沉锂母液中回收锂时，吸附容量可达40.12 mg·g−1，平衡时间仅需50 min。 6次循环后Li+的洗脱率可保持在90.56%，Ti的溶解损失不超过0.43%。所开发的纤维复合吸附剂表现出优异的吸附/解吸性能和循环稳定性，使其成为从锂沉淀母液和其他富锂碱性卤水资源中高效回收锂的竞争者。