Core–shell architectured NH2-UiO-66@ZIF-8/multi-walled carbon nanotubes nanocomposite-based sensitive electrochemical sensor towards simultaneous determination of Pb2+ and Cu2

• Published in: Mikrochimica acta (1966) Vol. 190; no. 1
• Main Authors: Tan, Runan, Jiang, Panpan, Pan, Chuchu, Pan, Junzi, Gao, Nan, Cai, Zhiwei, Wu, Fan, Chang, Gang, Xie, Aming, He, Yunbin
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.01.2023; Springer Nature B.V
• Subjects: Analytical Chemistry; Carbon; Characterization and Evaluation of Materials; Chemical sensors; Chemistry; Chemistry and Materials Science; Copper; Core-shell structure; Electrochemical analysis; Glassy carbon; Heavy metals; Metal-organic frameworks; Microengineering; Multi wall carbon nanotubes; Nanochemistry; Nanocomposites; Nanotechnology; Original Paper; Selectivity; Sensors; X ray photoelectron spectroscopy; Zeolites; Zirconium; Heavy metal ions detection; Electrochemical sensing; Core–shell MOF@MOF; Differential pulse anodic stripping voltammetry; Multi-walled carbon nanotubes; Metal–organic frameworks
• ISSN: 0026-3672; 1436-5073
• DOI: 10.1007/s00604-022-05599-6

Amino functionalized zirconium-based metal–organic framework (NH 2 -UiO-66) and zinc-based zeolitic imidazolate framework (ZIF-8) were integrated to develop a core–shell architectured hybrid material (NH 2 -UiO-66@ZIF-8, NU66@Z8). The morphology and structure evolutions of core–shell NU6@Z8 were investigated by FE-SEM, XRD, FTIR, and XPS. The NU66@Z8 combined with carboxylated multi-walled carbon nanotubes (CMWCNT) was deposited on a glassy carbon electrode (GCE) for fabricating an electrochemical platform towards detecting Pb 2+ and Cu 2+ . The NU66@Z8/CMWCNT/GCE revealed significantly improved electrochemical performance for determination of Pb 2+ and Cu 2+ compared with the individual components, which can be attributed to the strong adsorption capacity, unique core–shell structure, and large electrochemical active surface area of NU66@Z8/CMWCNT. Under the optimal conditions, the developed sensor exhibited excellent sensing capability with a low limit of detection (Pb 2+ ,1 nM; Cu 2+ , 10 nM) and a wide determination range (Pb 2+ ,0.003–70 μM; Cu 2+ , 0.03–50 μM). The sensor showed high selectivity towards common interfering ions and good repeatability. The real sample recoveries of proposed sensor were in the range 95.0–103% for Pb 2+ (RSD ≤ 5.3%) and 94.2–106% for Cu 2+ (RSD ≤ 5.9%), suggesting that the NU66@Z8/CMWCNT is suitable for examining trace heavy metals in natural environment. Graphical Abstract