فهرست نشریات علمی دسترسی آزاد ایران

In this study, an eco-friendly CuO/NiO/BN nanocomposite was developed through a simple phytosynthesis method using the aqueous extract of Stachys schtschegleevii (SSC). The plant extract serves as both a natural reducing agent and a stabilizing medium, facilitating the gentle and controlled formation of CuO and NiO nanoparticles on the bentonite (BN) surface. This green approach not only eliminates harsh chemicals, but also provides a reliable method for producing a stable, well-dispersed nanocomposite. The structure and composition of the nanocomposite were thoroughly verified using various analyses, including XRD (X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), FE-SEM (Field emission scanning electron microscopy), TEM (Transmission electron microscopy), TGA (Thermogravimetric analysis), DSC (Differential scanning calorimetry), ICP (inductively coupled plasma spectroscopy), and EDS (energy dispersive spectroscopy). The nanocomposite exhibited remarkable efficiency as a heterogeneous catalyst for the N-formylation of different amines. A wide range of substrates yielded corresponding N-formylated products in excellent yields (82-96%) within short reaction times (12-45 min) under mild and friendly conditions. The synergistic effect of CuO and NiO substantially facilitated the reaction, leading to enhanced activity relative to single-component systems. Importantly, the catalyst could be easily recovered through simple filtration and reused over several cycles with only minimal reduction in performance, as confirmed by post-reaction analyses, including XRD, FT-IR, and FE-SEM. Overall, this study highlights a sustainable and plant-assisted strategy for designing robust metal-oxide nanocatalysts, demonstrating their strong potential in promoting green and efficient organic transformations.