Abstract Salt lake brine with a high Mg/Li ratio remains one of major sources for lithium recovery. In this work, one kind of sensitive photochromic microspheres (SP-C/PVDF) with multimodal hierarchically porous structure was prepared via a facile phase inversion method. The SP-C in the microspheres was still stable and active resulting in stable reversible color switch of SP-C/PVDF. The SP-C/PVDF microspheres presented high selective adsorption for Li+ compared with that of Mg2+ under UV light irradiation. The pseudo-second-order model and chemical monolayer isotherm model can describe the adsorption kinetics and binding way with Li+, respectively. This work developed an available idea and method for selective extraction of trace Li+ from salt lake brine, which can provide references for the separation of other valuable ions from complex systems.

中文翻译：

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用于选择性提取锂离子的多峰分级多孔光致变色微球的简便制造

摘要 高镁锂比的盐湖卤水仍然是锂回收的主要来源之一。在这项工作中，通过简便的相转化方法制备了一种具有多模态分层多孔结构的敏感光致变色微球（SP-C/PVDF）。微球中的 SP-C 仍然稳定和活跃，导致 SP-C/PVDF 的稳定可逆颜色转换。在紫外光照射下，SP-C/PVDF 微球对 Li+ 的选择性吸附高于 Mg2+。拟二级模型和化学单层等温线模型可以分别描述与Li+的吸附动力学和结合方式。该工作提出了一种从盐湖卤水中选择性提取痕量Li+的可行思路和方法，可为复杂体系中其他有价值离子的分离提供参考。