A magnetically separable TiO_2-H_3PW_(12)O_(40)@Fe_3O_4/EN as magnetic core-shell nanoparticles on metal-organic framework MIL-101(Cr)

摘要

Hollow magnetic catalysts TiO_2-HPA@Fe_3O_4/EN-MIL-101 (HPA = Heteropoly acid) derived from metal-organic frameworks are fabricated through an easy method. The porosity of (PTA = phosphotungstic acid) in the original structure preserved the dispersion throughout the organic framework of chromium terephthalate with functional amines. The size of these nanocomposite is about 30-50 nm and reusable magnetic inorganic-organic catalyst, was synthesized and determined by XRD, EDX, TEM, FESEM, TGA, BET, VSM and AFM under hydrothermal method. The resulting magnetic core-shell nanoparticles as heterogeneous catalyst was an active catalyst for the multi-component green synthesis of benzo[a]furo[2,3-c] phenazine derivatives in good yields under solvent-free conditions, and offers facile separation and excellent recyclability. As a result, these magnetic adsorbents are anticipated to high adsorption activity as well as good separation and recollection rates from the aqueous solution.