Excessive phosphate in water bodies has become a major concern because it causes eutrophication and even disrupts the aquatic ecological balance. Electro-assisted adsorption exhibited great potential for wastewater treatment due to its efficient and rapid removal capacity, facile operation, and low cost. The key to electrosorption technology lies in the development of electrode materials. In this work, the bimetallic Ti–La active centers were created on novel hierarchically porous carbon electrode materials (TLPCs) via in situ growth of LaMOF on hierarchical TiO₂ followed by co-pyrolysis treatment. The TLPC2 electrode exhibited an exceptional phosphate removal capacity of 231.56 mg g⁻¹ with a rapid rate at 1.2 V, which is superb in comparison with that of other electrode materials from the literature. Higher correlation coefficients of the pseudo-second-order model demonstrate that the phosphate removal process involves both reaction on the electrode surface and chemisorption. The synergistic contribution of Ti and La not only delivers multiple active centers and plentiful oxygen vacancies but also boosts electrochemical activities. The superior phosphate removal capability can be ascribed to the coupling of electric field, ligand exchange, oxygen vacancy sites consumption, and electrostatic attraction. Moreover, the selectivity, stability, and actual water treatment for phosphate removal were maintained well even under comprehensive conditions. This study illustrates an insight into phosphate electrosorption and promotes the expectation for highly efficient electrode materials.

中文翻译：

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用于高效磷酸盐电吸附的分级多孔碳电极上的工程双金属捕获位点：多个活性中心和优异的电化学性能

水体中过量的磷酸盐已成为一个主要问题，因为它会导致富营养化，甚至破坏水生生态平衡。电辅助吸附由于其高效快速的去除能力、简便的操作和低成本，在废水处理方面显示出巨大的潜力。电吸附技术的关键在于电极材料的开发。在这项工作中，通过在分级 TiO ₂上原位生长 LaMOF，然后进行共热解处理，在新型分级多孔碳电极材料 (TLPC) 上创建了双金属 Ti-La 活性中心。TLPC2 电极表现出 231.56 mg g ^{-1的卓越磷酸盐去除能力}以 1.2 V 的快速速率，与文献中的其他电极材料相比，这是极好的。伪二级模型的较高相关系数表明磷酸盐去除过程涉及电极表面反应和化学吸附。Ti 和 La 的协同贡献不仅提供了多个活性中心和丰富的氧空位，而且还提高了电化学活性。优异的磷酸盐去除能力可归因于电场、配体交换、氧空位消耗和静电吸引的耦合。此外，即使在综合条件下，磷酸盐去除的选择性、稳定性和实际水处理也保持良好。