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Fe3O4nanoparticles can be effectively incorporated into the matrix of MIL-101(Cr) to fabricate a Fe3O4@MIL-101 magnetic nanocomposite which behaves as a magnetic nanocatalyst for the solvent free oxidation of benzyl alcohol.

Chitosan stabilised copper-iron oxide nanocomposite material is found to be a very efficient recyclable/reusable heterogeneous catalyst for azide-alkyne cycloaddition reaction under mild condition. The as-synthesized nanocomposite material is magnetically recoverable and reusable at least up to four times without significant loss in their catalytic activity. The catalytic system is found to be highly useful for the regioselective synthesis of a wide range of 1,2,3-triazoles from various azides and alkynes.

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The high surface to volume ratio of Fe3O4 nanorods facilitates the excellent activation of H2O2 for the photo-Fenton-like degradation of crystal violet dye under solar light.