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Triazole ligands with carboxylic acid at one termini and polyethylene oxide (PEO) at the other termini are synthesized via "click" chemistry and subsequently attached onto the Fe 3 O 4 surface by ligand-exchange reactions. Then the small-sized Au or Pd nanoparticles are encapsulated into this nanocomposite by their mild coordination with triazole, yielding efficient, green and magnetically-recoverable nano catalysts. Scheme 1 Synthetic route of Fe 3 O 4 -supported trz-AuNP (and trz-PdNP) catalyst.