High performance Hetero-Shelled hollow structure Metal-Organic framework hybrid material for the efficient electrochemical determination of lead ions

• Published in: Microchemical journal 2023-10, Vol.193, p.109147, Article 109147
• Main Authors: Tan, Boyu, Yuan, Ruoyu, Xie, Xiaopei, Qi, Youxiao, Qi, Zihan, Wang, Xinxing
• Format: Article
• Language: English
• Subjects: Electrochemical sensing; Hetero-shelled hollow structure; Hybrid material; Lead ion; Metal-organic framework
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2023.109147

[Display omitted] •A MOF hybrid material, HCZ@UN, with unique hetero-shelled hollow structure was prepared.•HCZ shows hollow porous carbon dodecahedron structure and good conductivity.•UN is nanometer size with large specific surface area and rich accessible active sites.•HCZ@UN exhibits excellent electrochemical property and sensitive response to Pb2+.•The synthesis strategy can be extended to build other MOF materials with extensive application value. Electrochemical sensing has unique advantages in developing on-site and online detection technologies for heavy metal ions (HMIs) due to its fast response, simple operation, high sensitivity, and portable instruments. The vigorous development of modern micro/nanomaterial preparation technology has provided greater space for improving the performance of electrochemical sensing platforms. In this work, a novel hetero-shelled hollow structure metal–organic framework (MOF) hybrid material (denoted as HCZ@UN) was prepared by adopting the hollow carbonized ZIF-8 (HCZ) as the substrate for growing UiO-66(Zr)–NH2 (UN), and subsequently used for efficient electrochemical detection of lead ions (Pb2+). The grown UN crystal particles were anchored on the HCZ hollow cages and showed nanometer size. The unique shell structure and nanometer size of UN created large specific surface area and rich accessible adsorption sites, which promoted the preconcentration of Pb2+. While the hollow carbon polyhedron structure of HCZ improved the dispersibility of UN and electron transfer ability of the material. These factors synergistically improved the detection sensitivity and sensing performance for Pb2+ determination with a wide linear range of 0.100–500 nM, a low detection limit of 0.0492 ± 0.00523 nM as well as good selectivity, repeatability and long-term stability. This paper provides a simple and effective method for the preparation of electroactive MOF functional materials, which is expected to inspire more interest in building other MOF-based materials with unique structure, high-performance and extensive application value.