Abstract This study proposes lithium ion sieves (LIS) embedded in a cross-linked hydroxyethyl cellulose (HEC) cryogel for the effective adsorption recovery Li+ from brine and seawater resources. The Li+ adsorption process conformed well with the Langmuir isotherm model, and the maximum Li+ adsorption capacities are calculated to be 42.57–54.23 mg/(g of LIS). In addition, the Li+ adsorption capacities of the LIS-HEC cryogels from artificial brine and seawater are 10.64 and 2.46 mg/(g of LIS), respectively. In addition, the Li+ selectivity of the LIS-HEC cryogels against other cations is consistent that of LIS powder. Moreover, monolithic columns of LIS-HEC cryogels exhibit good mechanical stability, small back pressure, and the periods required to complete the acid treatment, adsorption, and desorption processes during continuous operation are greatly decreased in comparison with the performances of other composite absorbents. These results demonstrate the potential of the proposed LIS-HEC cryogels for recovering Li+ from liquid lithium resources.

中文翻译：

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用于从盐水和海水中连续回收锂的羟乙基纤维素冷冻凝胶中锂离子筛的制备和表征

摘要 本研究提出了嵌入交联羟乙基纤维素 (HEC) 冷冻凝胶中的锂离子筛 (LIS)，用于从盐水和海水资源中有效吸附回收 Li+。Li+吸附过程符合Langmuir等温线模型，计算出最大Li+吸附容量为42.57-54.23 mg/(g of LIS)。此外，来自人造盐水和海水的 LIS-HEC 冷冻凝胶对 Li+ 的吸附容量分别为 10.64 和 2.46 mg/（g LIS）。此外，LIS-HEC 冷冻凝胶对其他阳离子的 Li+ 选择性与 LIS 粉末一致。此外，LIS-HEC 冷冻凝胶的整体柱具有良好的机械稳定性、较小的背压以及完成酸处理、吸附、与其他复合吸收剂的性能相比，连续操作过程中的解吸过程大大减少。这些结果证明了所提出的 LIS-HEC 冷冻凝胶从液态锂资源中回收 Li+ 的潜力。