The mitigation of phosphate in water is a pivotal concern for the prevention of eutrophication and enhancement of water quality. Capacitance deionization (CDI) technique possesses the merits of high removal efficacy, facile operation, and environmental friendliness, rendering it a promising strategy for phosphate elimination. Herein, the nitrogen-rich laminar porous carbon composites (NTPCs) prepared by direct pyrolysis of supermolecular precursor were utilized as phosphate capture electrodes. The resulting NTPC800 features a high nitrogen content turbostratically amorphous carbon framework, which facilitates efficient ion diffusion pathways and electron transfer. The abundant presence of edge nitrogen (pyridine and pyrrole nitrogen) optimizes the electronic structure of the carbon system and provides more active sites, thus leading to the boosted electrochemical activity and dephosphorization efficiency. Consequently, NTPC800 demonstrates a rapid phosphate removal capacity, achieving 73.51 mg g within a mere 10 min at 1.2 V condition, which is nearly 6 times more efficient than that of the commercial activated carbon electrode. Moreover, it exhibited consistent phosphate removal efficiency across various pH ranges, coexisting ion interferences, and cyclic stability assessments. This study provides theoretical support for the utilization of edge nitrogen decorated carbonaceous electrodes to enhance charge transfer and provide additional active sites for efficient capacitive dephosphorization.

中文翻译：

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赋予乱层多孔碳丰富的边缘氮活性位点，以有效电容去除磷酸盐

减少水中的磷酸盐是防止富营养化和提高水质的关键问题。电容去离子（CDI）技术具有去除效率高、操作简便、环境友好等优点，是一种很有前景的除磷策略。在此，利用超分子前体直接热解制备的富氮层状多孔碳复合材料（NTPC）作为磷酸盐捕获电极。由此产生的 NTPC800 具有高氮含量的乱层无定形碳框架，有利于有效的离子扩散路径和电子转移。边缘氮（吡啶和吡咯氮）的丰富存在优化了碳体系的电子结构并提供了更多的活性位点，从而提高了电化学活性和脱磷效率。因此，NTPC800 表现出快速的磷酸盐去除能力，在 1.2 V 条件下仅 10 分钟即可达到 73.51 mg g-1 的磷酸盐去除能力，比商用活性炭电极的效率提高了近 6 倍。此外，它在不同 pH 范围、共存离子干扰和循环稳定性评估中表现出一致的磷酸盐去除效率。该研究为利用边缘氮装饰碳质电极增强电荷转移并为高效电容脱磷提供额外的活性位点提供了理论支持。