School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, PR China.
School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, PR China; National Engineering Research Center for Colloidal Materials, Shandong University, Jinan, 250100, PR China.
Chemosphere. 2021 Sep;279:130487. doi: 10.1016/j.chemosphere.2021.130487. Epub 2021 Apr 5.
Recently, there has been an urgent need to develop new materials and technologies for extracting lithium ions. Herein, the membrane-type adsorbent of manganese dioxide (MnO) is prepared by a vacuum filtration method using graphene oxide (GO) as a binder and amino-β-cyclodextrin (amino-β-CD) as an adjuvant. The results of thermogravimetric analysis show that MnO is successfully immobilized on GO layers with a content of about 24 wt%, which enabled rapid adsorb lithium ions from the ionic solution. In addition, the permeation experiment shows the membrane has specific selectivity for lithium ion transport and adsorption, which is manifested in the selectivity ratios of K/Li, Na/Li and K/Na to 2.5, 3.2 and 0.8, respectively. Adsorption experiments show that GO-β-CD/MnO membrane has a high adsorption capacity for lithium ions (37.5 mg g). The adsorption kinetic curve indicates that the lithium adsorption process is controlled by the chemical adsorption mechanism. In the enrichment experiment, the concentration of lithium ions from seawater can be enriched to 1.2 mg L after 100 cycles. The results suggest that the developed GO-β-CD/MnO membrane could effectively extract lithium ions from seawater.
最近，人们迫切需要开发新的材料和技术来提取锂离子。在此，通过真空过滤法制备了以氧化石墨烯（GO）为粘结剂、氨基-β-环糊精（amino-β-CD）为助剂的二氧化锰（MnO）膜型吸附剂。热重分析结果表明，MnO 成功地固定在 GO 层上，含量约为 24wt%，这使得 MnO 能够从离子溶液中快速吸附锂离子。此外，渗透实验表明，该膜对锂离子的传输和吸附具有特定的选择性，表现在 K/Li、Na/Li 和 K/Na 的选择性比分别为 2.5、3.2 和 0.8。吸附实验表明，GO-β-CD/MnO 膜对锂离子具有较高的吸附容量（37.5mg g）。吸附动力学曲线表明，锂离子的吸附过程受化学吸附机制控制。在浓缩实验中，经过 100 次循环后，海水中锂离子的浓度可富集到 1.2mg L。结果表明，所开发的 GO-β-CD/MnO 膜可有效地从海水中提取锂离子。
