Magnetic Aluminosilicate Nanoclay: a Natural and Efficient Nanocatalyst for the Green Synthesis of 4H-Pyran Derivatives

摘要

In this study, the magnetic nanoparticles have been loaded on the halloysite nanotubes (HNTs) as an aluminosilicate clay mineral. Fe3O4/HNTs nanocomposite was fully characterized by Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray (EDX) analysis, thermogravimetric analysis (TGA), field-emission scanning electron microscopy (FE-SEM) image, transmission electron microscope (TEM) image, inductively coupled plasma (ICP) analysis, X-ray diffraction (XRD) pattern and vibrating sample magnetometer (VSM) curve. The performance of the Fe3O4/HNTs as a heterogeneous catalyst was investigated in the synthesis of 4H-pyran derivatives. The high efficiently, mild reaction condition, green solvents and using the eco-friendly and recoverable catalyst are the most advantages of the present work. Moreover, the simple separation and reuse of the Fe3O4/HNTs nanocatalyst were confirmed stability and efficiency of the catalyst after 7 runs.