Au nanoparticle-functionalized HKUST-1 sensor for electrochemical determination of sulfanilamide and acetaminophen.

Metal organic frameworks (MOFs) have been developed as a type of ideal electrode substrates for electrochemical sensing owing to their unique physicochemical properties. The improvement of their stability, sensitivity, signal-conversion capability, and universality of the related electrochemical sensors is the key to rapidly determinate contaminants. In this work, Au nanoparticles were introduced to prepare N-HKUST-1/Au composite to enhance conductivity and sensitivity of HKUST-1 modified material during electrochemical determination process. The introduction of exogenous Au materials increased the conductivity and electrochemical active area of N-HKUST-1, which in turn led to the broadening of the maximum detection concentration of SA to 251.6 μM. Meanwhile, N-HKUST-1/Au composite sensor for the determination of AP also exhibited excellent analytical performance with a detection range of 1–4448.4 μM and LOD of 0.16 μM. Furthermore, the recovery experiment at different concentration levels were conducted in practical water samples, the developed N-HKUST-1/Au composite sensor exhibits relatively satisfactory recoveries, indicating promising application in quantitative detection of SA and AP molecules. [Display omitted] • N-HKUST-1/Au composite were prepared by the liquid phase reduction method. • Effective electrochemical sensing platform combined with Au nanoparticles and HKUST-1 were achieved. • The architecture shows excellent electroanalysis activity toward the determination of AP and SA. • The as-constructed catalyst exhibits high analytic activity, and stability. [ABSTRACT FROM AUTHOR]

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