Hexagonally close-packed three-dimensional nano-flower entrapped on a heteroatom doped carbon sheets: A sensitive electro-catalyst to determine sulfonamide in environmental samples.

Sulfamethazine (SMZ) is one of the antibiotics frequently found with low concentrations in water bodies including drinking water sources and foodstuffs contamination, which affects the environmental ecosystem and humans. Therefore, the detection of SMZ is necessary to protect the biosphere. This work provides an investigation of the SMZ oxidation process using the electrochemical method by hydrothermally synthesized Barium doped Zinc oxide (BZO) with nitrogen and boron-doped reduced graphene oxide (NBRGO). The BZO/NBRGO composite was characterized using FESEM, EDAX, HR-TEM, Raman-spectroscopy, XRD, and XPS. Further, an electrochemical investigation has also made use of EIS, CV, and DPV. The limit of detection (LOD) of the SMZ has been found 0.003 µM with high sensitivity of 12.804 µA µM-1 cm-2 and a linear range (0.01-711 µM). Additionally, the repeatability, reproducibility, and stability of the BZO/NBRGO electrode have an excellent outcome compared with other electrodes. These prepared BZO/NBRGO electrodes have been used for the determination of SMZ in milk and water sample with acceptable recoveries.

Fabrication of ZnWO4/Carbon Black Nanocomposites Modified Glassy Carbon Electrode for Enhanced Electrochemical Determination of Ciprofloxacin in Environmental Water Samples.

The major problem facing humanity in the world right now is the sustainable provision of water and electricity. Therefore, it is essential to advance methods for the long-term elimination or removal of organic contaminants in the biosphere. Ciprofloxacin (CIP) is one of the most harmful pollutants affecting human health through improper industrial usage. In this study, a zinc tungsten oxide (ZnWO4) nanomaterial was prepared with a simple hydrothermal synthesis. The ZnWO4/Carbon black nanocomposites were fabricated for the determination of CIP. The nanocomposites were characterized by field emission scanning electron microscopy, energy dispersion X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy. Electrochemical studies were done using cyclic voltammetry and differential pulse voltammetry methods. Based on the electrode preparation, the electrochemical detection of CIP was carried out, producing exceptional electrocatalytic performance with a limit of detection of 0.02 µM and an excellent sensitivity of (1.71 µA µM-1 cm-2). In addition, the modified electrode displayed great selectivity and acceptable recoveries in an environmental water sample analysis for CIP detection of 97.6% to 99.2%. The technique demonstrated high sensitivity, selectivity, outstanding consistency, and promise for use in ciprofloxacin detection. Ciprofloxacin was discovered using this brand-new voltammetry technique in a water sample analysis.