Excessive Fe3+ ion concentrations in wastewater pose a long-standing threat to human health. Achieving low-cost, high-efficiency quantification of Fe3+ ion concentration in unknown solutions can guide environmental management decisions and optimize water treatment processes. In this study, by leveraging the rapid, real-time detection capabilities of nanopores and the specific chemical binding affinity of tannic acid to Fe3+, a linear relationship between the ion current and Fe3+ ion concentration was established. Utilizing this linear relationship, quantification of Fe3+ ion concentration in unknown solutions was achieved. Furthermore, ethylenediaminetetraacetic acid disodium salt was employed to displace Fe3+ from the nanopores, allowing them to be restored to their initial conditions and reused for Fe3+ ion quantification. The reusable bioinspired nanopores remain functional over 330 days of storage. This recycling capability and the long-term stability of the nanopores contribute to a significant reduction in costs. This study provides a strategy for the quantification of unknown Fe3+ concentration using nanopores, with potential applications in environmental assessment, health monitoring, and so forth.

中文翻译：

---

使用可重复使用的仿生纳米孔进行 Fe3+ 离子定量


废水中过高的 Fe3+ 离子浓度对人类健康构成长期威胁。对未知溶液中的 Fe3+ 离子浓度进行低成本、高效的定量分析，可以指导环境管理决策并优化水处理工艺。本研究利用纳米孔的快速、实时检测能力和单宁酸与 Fe3+ 的特异性化学结合亲和力，建立了离子电流与 Fe3+ 离子浓度之间的线性关系。利用这种线性关系，实现了未知溶液中 Fe3+ 离子浓度的定量。此外，采用乙二胺四乙酸二钠盐从纳米孔中取代 Fe3+，使其恢复到初始状态并重新用于 Fe3+ 离子定量。可重复使用的仿生纳米孔可在 330 天的储存中保持功能。纳米孔的这种回收能力和长期稳定性有助于显著降低成本。本研究提供了一种使用纳米孔量化未知 Fe3+ 浓度的策略，在环境评估、健康监测等方面具有潜在应用。