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Core–shell architectured NH2-UiO-66@ZIF-8/multi-walled carbon nanotubes nanocomposite-based sensitive electrochemical sensor towards simultaneous determination of Pb2+ and Cu2
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Core–shell architectured NH2-UiO-66@ZIF-8/multi-walled carbon nanotubes nanocomposite-based sensitive electrochemical sensor towards simultaneous determination of Pb2+ and Cu2
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Journal Article
Core–shell architectured NH2-UiO-66@ZIF-8/multi-walled carbon nanotubes nanocomposite-based sensitive electrochemical sensor towards simultaneous determination of Pb2+ and Cu2
2023
Overview
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
Publisher
Springer Vienna,Springer Nature B.V
