收稿日期: 2025-03-13
网络出版日期: 2025-10-27
Study on interface-engineered CoP/phosphorus-nitrogen porous carbon for simultaneous and highly sensitive detection of Cd2+ and Pb2+
Received date: 2025-03-13
Online published: 2025-10-27
为满足水体重金属离子快速检测需求，采用水热-碳化-磷化多步耦合策略构筑了磷化钴修饰磷氮共掺杂多孔炭管（CoP@P-N-C-550），并开发出新型电化学传感平台用于Cd2+和Pb2+高灵敏度检测。通过杂原子掺杂与金属磷化协同调控材料电子结构，结合炭管多孔形貌的传质优势，显著提升电极界面电子转移效率。实验表明：单离子检测时，Cd2+为0.05~6.00 μmol/L时，灵敏度达15.226 4 μA/（μmol/L）、检测限（LOD）为5.36 nmol/L，Pb2+为0.50~6.00 μmol/L时，灵敏度达26.773 6 μA/（μmol/L）、LOD为3.13 nmol/L；双离子同步检测时，Pb2+灵敏度提升至37.008 8 μA/（μmol/L），LOD降至2.20 nmol/L，有效规避离子间干扰。该传感器重复性优异（10次制备对Cd2+和Pb2+检测的RSD<2.4%），在实际水样（矿泉水、自来水）中对Cd2+（91.00%~104.00%）与Pb2+（87.00%~104.33%）实现了高精度回收，突破传统电极抗基质干扰瓶颈。此研究为多金属离子同步检测提供了界面工程优化新策略，在环境监测领域具有重要应用价值。
李慧宇 , 杨超 , 朱保顺 , 张晋 , 程志晗 , 欧阳全胜 . 界面工程构建CoP/磷氮多孔炭实现镉铅同步高灵敏检测研究[J]. 无机盐工业, 2025 , 57(10) : 119 -128 . DOI: 10.19964/j.issn.1006-4990.2025-0118
To meet the demand for rapid detection of heavy metal ions in water，a novel electrochemical sensing platform based on phosphorus-doped cobalt phosphide modified phosphorus and nitrogen co-doped porous carbon tubes（CoP@P-N-C-550） was developed through a hydrothermal-carbonization-phosphidation coupled strategy.The electronic structure of the material was innovatively regulated by heteroatom doping and metal phosphide synergistic effect，and combined with the mass transfer advantage of the porous carbon tube morphology，the electron transfer efficiency at the electrode interface was significantly improved.The experimental results showed that in single-ion detection，the sensitivity for Cd2+ was 15.226 4 μA/（μmol/L） in the range of 0.05~6.00 μmol/L（LOD=5.36 nmol/L），and for Pb2+，it was 26.773 6 μA/（μmol/L） in the range of 0.50~6.00 μmol/L（LOD=3.13 nmol/L）.In simultaneous detection of two ions，the sensitivity for Pb2+ was increased to 37.008 8 μA/（μmol/L） and LOD was decreased to 2.20 nmol/L，effectively avoiding ion interference.The sensor exhibited excellent repeatability（RSD<2.4% for 10 preparations in detecting Cd2+ and Pb2+），and achieved high-precision recovery of Cd2+（91.00%~104.00%） and Pb2+（87.00%~104.33%） in real water samples（mineral and tap water），overcoming the traditional electrode's matrix interference bottleneck.This work provided a new strategy of interface engineering optimization for simultaneous detection of multiple metal ions and holds important application value in environmental monitoring.
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