Neodymium(III) Vanadate-Decorated Functionalized Carbon Nanofiber Nanocomposite: An Electrochemical Tool for Tartrazine Monitoring
Aravind Radha, Sea‐Fue Wang
Abstract
Human health is adversely affected by the excessive consumption of substances such as food colorants, exposure to metal ion dosages, antibiotic residues, and pesticide residues above the maximum tolerated levels. Among them, the synthetic food dye tartrazine (TRZ), widely used in various foods, is harmful to human health because of its pathogenicity and toxicity. Neodymium vanadate (NdVO 4 ) nanoparticles embedded in functionalized carbon nanofiber (F-CNF)-modified electrodes serve as sensitive electrodes for TRZ detection. Neodymium is a rare-earth metal with a significant advantage over other rare-earth metals in electrochemical redox reactions. Furthermore, fast electron mobility for well-defined current potentials and well-separated peaks suggests that NdVO 4 has an increased active surface area. The modified NdVO 4 @F-CNF/GCE exhibits a smaller semicircle value R ct = 20.1 Ω·cm 2 and a lower cyclic voltammetry peak-to-peak separation of Δ E p = 98 mV in the redox probe. The NdVO 4 @F-CNF-modified GCE exhibited a higher current response of I pa = 17.05 μA at a peak potential of E pa = 0.69 V (vs Ag/AgCl). The nanocomposite is therefore chosen as an astounding detecting candidate due to the addition of F-CNF, which exhibits a significant improvement in electronic conductivity. Under optimal conditions, the sensor has a low detection limit (0.0011 μM) with a linear response of the 0.05–271.6 μM concentration range of TRZ. NdVO 4 @F-CNF was used to investigate the electrochemical sensing of TRZ in orange juice and orange jelly samples.