In this paper, 4′-aminobenzo-18-crown-6 ether was grafted onto the surface of carbon felt via a diazotization reaction, and a composite material (CE@CF) was obtained. Then, CE@CF was used as an electrode to extract Sr²⁺ from aqueous solutions and simulated seawater by an asymmetric pulsed current-assisted electrochemical (AP-CE) method. Due to the excellent conductivity of carbon felt and the selectivity of crown ether molecules, the CE@CF electrode exhibited excellent electrochemical extraction performance. Under the optimal alternating potential, the maximum removal efficiency and maximum adsorption capacity of Sr²⁺ reached 99.5% and 668.9 mg g⁻¹, respectively. The Sr²⁺ ions adsorbed on the surface of the CE@CF electrode could be desorbed by applying a positive voltage without an eluent, and the CE@CF electrode displayed good recyclability. This work provides an effective strategy for developing covalently-decorated crown ether carbon felt electrodes. The AP-CE method is of great significance for the selective electrosorption of metal ions.

本文通过重氮化反应将4'-氨基苯并-18-冠-6醚接枝到碳毡表面，得到复合材料（CE@CF）。然后，将CE@CF用作电极，通过不对称脉冲电流辅助电化学（AP-CE）方法从水溶液和模拟海水中提取Sr ²⁺。由于碳毡优异的导电性和冠醚分子的选择性，CE@CF电极表现出优异的电化学提取性能。在最佳交流电位下，Sr ²⁺的最大去除效率和最大吸附容量分别达到99.5%和668.9 mg g ^-1。Sr ²⁺吸附在CE@CF电极表面的离子可以通过施加正电压在没有洗脱液的情况下解吸，并且CE@CF电极显示出良好的可回收性。这项工作为开发共价修饰的冠醚碳毡电极提供了一种有效的策略。AP-CE方法对金属离子的选择性电吸附具有重要意义。