Fe₃O₄ nanoparticles can be effectively incorporated into the matrix of MIL-101(Cr) to fabricate a Fe₃O₄@MIL-101 magnetite nanocomposite which behaves as a magnetic nanocatalyst for the solvent free oxidation of benzyl alcohol in the presence of TBHP. The composite material is magnetically separable and can be reused several times.