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Bio-inspired fabrication of Ester-functionalized imprinted composite membrane for rapid and high-efficient recovery of lithium ion from seawater.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.jcis.2020.03.091 Chao Yu 1 , Jian Lu 2 , Jingwen Dai 3 , Zeqing Dong 2 , Xinyu Lin 2 , Wendong Xing 2 , Yilin Wu 2 , Zhongfei Ma 4
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.jcis.2020.03.091 Chao Yu 1 , Jian Lu 2 , Jingwen Dai 3 , Zeqing Dong 2 , Xinyu Lin 2 , Wendong Xing 2 , Yilin Wu 2 , Zhongfei Ma 4
Affiliation
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Lithium ion (Li+) is one of the important sustainable resource and it's urgently demanded to develop high-selectivity and high-efficient method to extract of Li+ from seawater. Hence, we propose the ester-functionalized ion-imprinted membrane (IIMs) with high selectivity and stability for the rebinding and separation of Li+ in aqueous medium via ion imprinted technology and membrane separation technology. In this work, the hydrophilic polydimethylsiloxane membranes (PDMS) are synthesized by self-polymerization of dopamine (DA) in aqueous solution, resulting in the fabrication of dense poly-dopamine (PDA) layer on the surface of PDMS (PDMS-PDA). In view of weak bonding forces (such as hydrogen bond, ionic bond and Van der Waals' force) between traditional imprinted polymer and ligand, the ester groups are formed between modified PDMS-PDA and ligand by surface grafting. The obtained Li+ imprinted membranes (Li-IIMs) have a suitable cavity and high adsorption capacity toward Li+ which reveal a high rebinding capacity (50.872 mg g-1) toward Li+ based on ample rebinding sites and strong affinity force. The superior relative selectivity coefficients (αNa/Li, αK/Li and αRb/Li are 1.71, 4.56 and 3.80, respectively) can be also achieved. The selectivity factors of Li-IIMs for Na+, K+ and Rb+ are estimated to be 2.52, 2.8 and 3.03 times larger than Li+ non-imprinted membranes (Li-NIMs), which imply the superior selectivity of Li-IIMs toward Li+. The regeneration ability of Li-IIMs is observed by systematic batch experiments. In summary, it can be concluded that the rebinding capacities of Li-IIMs is slightly decrease after eluting process, owing to the Li-IIMs with outstanding stability performance. Presentation of the method pave a fine prospect for coming true the long-term use of imprinted membrane.
中文翻译：
生物启发的酯基功能化印迹复合膜的制备，可快速高效地从海水中回收锂离子。
锂离子（Li +）是重要的可持续资源之一，迫切需要开发一种高选择性，高效的方法从海水中提取Li +。因此，我们提出了一种具有高选择性和稳定性的酯官能化离子印迹膜（IIMs），用于通过离子印迹技术和膜分离技术对水介质中的Li +进行重新结合和分离。在这项工作中，通过水溶液中多巴胺（DA）的自聚合合成亲水性聚二甲基硅氧烷膜（PDMS），从而在PDMS（PDMS-PDA）表面上形成致密的聚多巴胺（PDA）层。鉴于传统印迹聚合物与配体之间的键合力弱（例如氢键，离子键和范德华力），酯基通过表面接枝在改性PDMS-PDA和配体之间形成。所获得的Li +印迹膜（Li-IIMs）具有合适的空腔和对Li +的高吸附能力，基于充足的结合位点和强大的亲和力，它显示出对Li +的高结合能力（50.872 mg g-1）。还可以获得较高的相对选择性系数（αNa/ Li，αK/ Li和αRb/ Li分别为1.71、4.56和3.80）。Li-IIM对Na +，K +和Rb +的选择性因子估计是Li +非印迹膜（Li-NIMs）的2.52、2.8和3.03倍，这表明Li-IIM对Li +的选择性更高。通过系统的分批实验观察了Li-IIMs的再生能力。综上所述，可以得出结论，由于Li-IIM具有出色的稳定性能，洗脱后Li-IIM的重结合能力会略有下降。该方法的提出为长期使用印迹膜提供了良好的前景。
更新日期：2020-03-31
中文翻译：
生物启发的酯基功能化印迹复合膜的制备，可快速高效地从海水中回收锂离子。
锂离子（Li +）是重要的可持续资源之一，迫切需要开发一种高选择性，高效的方法从海水中提取Li +。因此，我们提出了一种具有高选择性和稳定性的酯官能化离子印迹膜（IIMs），用于通过离子印迹技术和膜分离技术对水介质中的Li +进行重新结合和分离。在这项工作中，通过水溶液中多巴胺（DA）的自聚合合成亲水性聚二甲基硅氧烷膜（PDMS），从而在PDMS（PDMS-PDA）表面上形成致密的聚多巴胺（PDA）层。鉴于传统印迹聚合物与配体之间的键合力弱（例如氢键，离子键和范德华力），酯基通过表面接枝在改性PDMS-PDA和配体之间形成。所获得的Li +印迹膜（Li-IIMs）具有合适的空腔和对Li +的高吸附能力，基于充足的结合位点和强大的亲和力，它显示出对Li +的高结合能力（50.872 mg g-1）。还可以获得较高的相对选择性系数（αNa/ Li，αK/ Li和αRb/ Li分别为1.71、4.56和3.80）。Li-IIM对Na +，K +和Rb +的选择性因子估计是Li +非印迹膜（Li-NIMs）的2.52、2.8和3.03倍，这表明Li-IIM对Li +的选择性更高。通过系统的分批实验观察了Li-IIMs的再生能力。综上所述，可以得出结论，由于Li-IIM具有出色的稳定性能，洗脱后Li-IIM的重结合能力会略有下降。该方法的提出为长期使用印迹膜提供了良好的前景。
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