Green synthesis of Pd/Fe3O4 nanocomposite using Hibiscus tiliaceus L. extract and its application for reductive catalysis of Cr(VI) and nitro compounds

During this paper, palladium nanoparticles were immobilized on the surface of Fe3O4 using Hibiscus tiliaceus L. extract as a stabilizing and reducing agent. The green synthesized Pd/Fe3O4 nanocomposite was characterized by FT-IR, UV-Vis, TEM, XRD, VSM, FESEM and EDS. The prepared Pd/Fe3O4 nanocomposite was used an efficient catalyst for the reduction of Cr(VI), 4-nitrophenol (4-NP) and 2,4-dinitrophenylhydrazine (2,4-DNPH). The catalytic activities of the Pd/Fe3O4 nanocomposite in reactions were monitored by using UV-Vis spectroscopy. It can be recovered and reused six times without remarkable loss of its catalytic activity.