Abstract:
Water pollution contaminates lakes, rivers, oceans, and groundwater due to harmful chemicals and
microorganisms resulting from human and industrial activities. This pollution impacts aquatic ecosystems
and human health. Tomatoes, being highly perishable, also face significant storage challenges. This study
seeks to develop effective methods to eliminate these pollutants without causing additional harm, which is
essential. Over the years, various techniques have been employed to address this issue, but they often fall
short of fully resolving water pollution and preventing environmental degradation. Water pollution and
food spoilage are pressing global issues that require innovative, eco-friendly solutions. This study
synthesized Iron (III) Oxide-Zinc Oxide (Fe₂O₃/ZnO) nanocomposites using Carissa edulis leaf extract for
dual applications: photocatalytic degradation of pollutants and extension of tomato shelf life. The
optimized parameters were pH 11, 60°C, and 90 minutes for ZnO NPs, and 70°C for 120 minutes for
Fe₂O₃ NPs. Characterization techniques included UV-Vis spectroscopy, XRD, SEM, and FT-IR .Results
showed energy band gaps of 3.23 eV for ZnO NPs, 2.56 eV for Fe₂O₃, and 2.8 eV for Fe₂O₃/ZnO NCs,
with particle sizes of 14 nm, 19 nm, and 25 nm, respectively. The Fe₂O₃/ZnO NCs exhibited a
photocatalytic efficiency of 95% for methylene blue dye and significantly reduced spoilage in tomatoes by
maintaining moisture content and reducing weight loss by 94% compared to untreated controls. These
findings demonstrate the potential for environmentally friendly nanotechnology in addressing critical
agricultural and environmental challenges.
