Abstract：
The special properties of rare earth elements (REE) have effectively broadened their application fields. How to accurately recognize and efficiently separate target rare earth ions with similar radii and chemical properties remains a formidable challenge. Here, precise two-dimensional (2D) heterogeneous channels are constructed using engineered E. coli membranes between graphene oxide (GO) layers. The difference in binding ability and corresponding conformational change between Lanmodulin (LanM) and rare earth ions in the heterogeneous channel allows for precisely recognizing and sieving of scandium ions (Sc3+). The engineered E. coli membranes not only can protect the integrity of structure and functionality of LanM, the rich lipids and sugars, but also help the Escherichia coli (E. coli) membranes closely tile on the GO nanosheets through interaction, preventing swelling and controlling interlayer spacing accurately down to the sub-nanometer. Apparently, the 2D heterogeneous channels showcase excellent selectivity for trivalent ions (SFFe /Sc≈3), especially for Sc3+ ions in REE with high selectivity (SFCe/Sc≈167, SFLa/Sc≈103). The long-term stability and tensile strain tests verify the membrane\'s outstanding stability. Thus, this simple, efficient, and cost-effective work provides a suggestion for constructing 2D interlayer heterogeneous channels for precise sieving, and this valuable strategy is proposed for the efficient extraction of Sc.
摘要：
稀土元素的特殊性质有效地拓宽了其应用领域。如何准确识别和有效分离具有相似半径和化学性质的目标稀土离子仍然是一个巨大的挑战。这里,我们使用石墨烯氧化（GO）层之间的工程大肠杆菌膜构建了精确的二维（2D）异质通道。异质通道中Lanmodulin（LanM）与稀土离子之间的结合能力和相应构象变化的差异允许精确识别和筛分scan离子（Sc3）。工程大肠杆菌膜不仅可以保护LanM的结构和功能的完整性,丰富的脂质和糖，还通过相互作用帮助大肠杆菌膜紧密贴在GO纳米片上，防止膨胀和控制层间间距精确到亚纳米。显然,2D异质通道对三价离子表现出优异的选择性(SFFe3+/Sc3+≈3)，特别是对于稀土元素中的Sc3离子具有高选择性（SFCe/Sc≈167，SFLa/Sc≈103）。长期稳定性和拉伸应变测试验证了膜的出色稳定性。因此，这个简单的,高效,和具有成本效益的工作提供了一个建议，为构建二维夹层异质通道进行精确筛分，并为Sc的高效提取提出了有价值的策略。本文受版权保护。保留所有权利。
