Dhayanithi Senthilkumar,Chih-Yu Kuo,Samar A. Aldossari,Mani Govindasamy
It is essential to monitor the concentration of synthetic coloring agents in food and beverages due to their potential severe side effects on human health. In this study, yttrium iron oxide (YFO) nanoparticles were synthesized via a hydrothermal method, followed by modification with functionalized carbon nanofibers (f-CNF) through a simple sono-chemical process. The synthesized YFO/f-CNF was thoroughly characterized using various analytical techniques. Concurrent electrochemical detection of sunset yellow (SSY) and tartrazine (TRT) was achieved using a glassy carbon electrode modified with the YFO/f-CNF nanocomposite, enabling highly effective detection of SSY and TRT in food samples. Under optimized conditions, the modified electrode demonstrates a wide linear range (0.05 μM – 466.15 μM) and very low limits of detection (LOD) for SSY (1.5 nM) and TRT (3.2 nM). Additionally, the modified electrode exhibits significantly higher sensitivity (7.23 μAμM 1 cm −2 ) for SSY and (3.01 μAμM −1 cm −2 ) for TRT compared to other reported values. This work showcases excellent sensitivity and selectivity, capable of identifying trace amounts of azo dyes in complex food matrices such as fruit juices, soft drinks, and packaged foods. The sensor's performance in real food samples, including both beverages and solid food products, was comparable to traditional high-performance liquid chromatography (HPLC), with a strong correlation in detection limits and accuracy (95.7–99.1 %). Furthermore, the sensor demonstrated exceptional stability and reproducibility in food matrix analysis, providing a reliable and efficient tool for routine monitoring of azo dye contamination in food and beverage industries.
A novel catalyst composed of Ag 3 PO 4 bridged by Ni/Ti LDH-graphene heterojunction structure was successfully prepared by a simple in-situ deposition method, which has excellent catalytic performance for 4-NP and 2-NA. Various characterizations to the samples such as XRD, SEM, TEM, STEM-EDS, XPS, TG–DSC, and UV–vis DRS were adopted. Because the ternary structure is mixed with each other to form more heterojunctions and higher specific surface area, the ternary composite Ag 3 PO 4 /Ni-Ti LDH/GO has excellent catalytic and cycle performance. Compared to the precursors Ag 3 PO 4 /GO and Ni-Ti LDH/GO, the finally as-obtained nanocomposite Ag 3 PO 4 /Ni-Ti LDH/GO degraded 4-NP and 2-NA solutions represented more dominant degradation efficiency. In addition, the pseudo-first-order rate constants of the composite catalyst for 4-NP and 2-NA are 0.178 min −1 and 0.089 min −1 , respectively. The complex and irregular surfaces of Ni-Ti LDH/GO provided an ideal carrier with abundant active sites for in-situ depositing and stabilizing of Ag 3 PO 4 NPs, formed the Ag 3 PO 4 /Ni-Ti LDH/GO hybrid possessed an acceptable catalytic performance on the degradation of azo dyes, which could be applied in the efficient treatment of wastewater from industries.
危险品化学品经营许可证（带存储）