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<p>A&#xa0;CuFeO<sub>2</sub>/NiCo-LDH heterojunction electrochemical sensor (LDH: layered double hydroxide) was developed for the sensitive detection of tetracycline (TC). The sensor was constructed by integrating ZIF-67-derived nanocage NiCo-LDH on nickel foam with CuFeO<sub>2</sub>, forming a p-n heterojunction that enhanced electron transfer and TC adsorption. The sensor exhibited bilinear detection ranges (0.00594 ~ 1 and 1 ~ 25&#xa0;μM) and a low detection limit of 1.98&#xa0;nM. Recoveries in real water samples ranged from 92.0 to 109.0%, with relative standard deviations not exceeding 4.5%. In situ Raman spectroscopy and density functional theory calculations confirmed the involvement of multiple redox pairs (Ni<sup>3+</sup>/Ni<sup>2+</sup>, Co<sup>3+</sup>/Co<sup>2+</sup>, Fe<sup>3+</sup>/Fe<sup>2+</sup> and Cu<sup>2+</sup>/Cu<sup>+</sup>) and strong interfacial adsorption energy. This sensor presents a practical and efficient approach for onsite TC monitoring.</p> Graphical Abstract <p></p>

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Highly sensitive detection and mechanism study of tetracycline in water by CuFeO2/NiCo-LDH heterojunction electrochemical sensor

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Aijin Xiao,
  • Meng Li,
  • Yiluo Hu,
  • Wei Zhang,
  • Huiping Bai,
  • Xuejun Pan,
  • Fengzhi Jiang

摘要

A CuFeO2/NiCo-LDH heterojunction electrochemical sensor (LDH: layered double hydroxide) was developed for the sensitive detection of tetracycline (TC). The sensor was constructed by integrating ZIF-67-derived nanocage NiCo-LDH on nickel foam with CuFeO2, forming a p-n heterojunction that enhanced electron transfer and TC adsorption. The sensor exhibited bilinear detection ranges (0.00594 ~ 1 and 1 ~ 25 μM) and a low detection limit of 1.98 nM. Recoveries in real water samples ranged from 92.0 to 109.0%, with relative standard deviations not exceeding 4.5%. In situ Raman spectroscopy and density functional theory calculations confirmed the involvement of multiple redox pairs (Ni3+/Ni2+, Co3+/Co2+, Fe3+/Fe2+ and Cu2+/Cu+) and strong interfacial adsorption energy. This sensor presents a practical and efficient approach for onsite TC monitoring.

Graphical Abstract