چكيده به لاتين
Rapid industrialization in recent years has been identified as a major cause of significant environmental concerns, including air, soil, and water pollution. Various environmental factors, especially water pollution, have a substantial impact on quality of life. Nitroaromatic compounds and organic dyes are some of the most critical pollutants affecting groundwater. The aim of this research is to eliminate these toxic and carcinogenic pollutants and transform them into less harmful and more valuable amino¬aromatic compounds, which have applications in the pharmaceutical industry. This study introduces a straightforward and eco-friendly method to fabricate an efficient magnetic nano¬catalyst that facilitates easy recovery, specifically for the catalytic reduction of nitroaromatic compounds. The process begins with the creation of a magnetic core composed iron oxide nanoparticles, which are coated with silica and functionalized with 3-(aminopropyltriethoxysilane). Following this, chitosan—an abundant, natural, and biodegradable material derived from the shells of crustaceans such as crabs and shrimp—is modified using ethylenediaminetetraacetic acid as a chelating and cross-linking agent, along with the amino acid L-glutamine, to form a modified chitosan support that is attached to the magnetic core. Finally, copper, one of the most abundant, accessible, and cost-effective metals in the Earth's crust, is stabilized on the prepared support using copper (II) acetate salt. The structural characteristics of the synthesized catalyst were examined using field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR). Thermogravimetric analysis (TGA) demonstrated appropriate thermal stability, energy-dispersive X-ray spectroscopy (EDS) revealed the elemental composition, and mapping analysis verified the uniform distribution of particles The advantages of this catalyst are its use of natural, readily available, and cost-effective materials, high yield, short reaction time, and reusability for up to four consecutive cycle.
