非对称电化学去离子体系中层状双金属氢氧化物电极的磷酸盐吸附性能优化

doi:10.1016/j.actphy.2026.100330

摘要/Abstract

摘要：

含磷废水的大量排放会导致严重的水体富营养化，威胁全球水环境安全。电化学去离子(EDI)是一类极具应用潜力的废水除磷技术，但电极容量偏低、不对称体系容量失配的问题，严重限制了其工程实际应用。本研究采用一步水热法，在导电碳布(CC)表面原位生长具有立方体形貌的CoFe层状双金属氢氧化物(LDH)和具有纳米针状同轴结构的CoAl LDH，作为不对称EDI系统的自支撑阳极。得益于独特的多级结构与晶体特性，该材料具备更优异的离子传输动力学性能及丰富的活性位点。对比测试表明，CoAl LDH电极的电化学性能与磷酸盐吸附容量显著优于CoFe LDH电极。通过将阴、阳极质量比优化至2 : 1，有效改善了不对称体系的容量失配缺陷。优化后的CoAl LDH/CC阳极EDI系统在1.2 V工作电压下，磷酸盐吸附容量可达41.9 mg P g⁻¹ (毫克磷元素每克电极)，且长效稳定性优异，连续运行120 h后容量保有率仍维持在87%。该研究为高性能除磷EDI水处理系统的研发与应用提供了重要参考依据。

关键词: 磷酸盐去除, 电化学去离子, 层状双金属氢氧化物, 自支撑电极

Abstract:

Uncontrolled discharge of phosphate-containing wastewater causes severe aquatic eutrophication, posing a critical challenge to global water security. Electrochemical deionization (EDI) is a promising approach for phosphate removal, but its practical application is hindered by limited electrode capacity and capacity mismatch in asymmetric systems. Herein, cubic CoFe-layered double hydroxide (LDH) and nanospike coaxial CoAl LDH were in-situ grown on conductive carbon cloth (CC) via a one-step hydrothermal method as freestanding anodes for asymmetric EDI systems. The CoAl LDH electrode exhibits superior electrochemical performance and phosphate adsorption capacity compared to CoFe LDH, owing to its unique hierarchical structure and crystal structure that enables faster ion transport kinetics and richer active sites. By optimizing the cathode/anode mass ratio to 2 : 1, the capacity mismatch issue of the asymmetric system is effectively mitigated, and the optimized EDI system with CoAl LDH/CC anode delivers a high phosphate adsorption capacity of 41.9 mg P g⁻¹ at 1.2 V, along with excellent long-term stability (87% capacity retention after 120 h continuous operation). This work provides valuable insights for the development of high-performance EDI systems for phosphate removal.

Key words: Phosphate removal, Electrochemical deionization, Layered double hydroxide, Freestanding electrode

王梓全, 梁注杰, 刘醒, 林祎凰, 刘江罗, 陈增烨, 邓立波. 非对称电化学去离子体系中层状双金属氢氧化物电极的磷酸盐吸附性能优化[J]. 物理化学学报, 2026, 42(10), 100330. doi: 10.1016/j.actphy.2026.100330

Ziquan Wang, Zhujie Liang, Xing Liu, Yihuang Lin, Jiangluo Liu, Zengye Chen, Libo Deng. Maximizing the phosphate adsorption capacity of layered double hydroxides in asymmetric electrochemical deionization systems[J]. Acta Phys. -Chim. Sin. 2026, 42(10), 100330. doi: 10.1016/j.actphy.2026.100330

链接本文: https://www.whxb.pku.edu.cn/CN/10.1016/j.actphy.2026.100330

https://www.whxb.pku.edu.cn/CN/Y2026/V42/I10/100330

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非对称电化学去离子体系中层状双金属氢氧化物电极的磷酸盐吸附性能优化

Maximizing the phosphate adsorption capacity of layered double hydroxides in asymmetric electrochemical deionization systems

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