In‐situ synthesis of magnetic Ce‐BDC@Fe3O4 metal–organic frameworks and their multiple enzyme‐mimicking catalysis

Abstract

Abstract In this work, we used nano‐magnetic fluid to magnetize Ce‐BDC metal–organic framework (MOF) (BDC = 1,4‐benzenedicarboxylic acid) by using Fe3O4‐based nano‐magnetic fluid grown in situ around a Ce‐BDC core. The obtained Ce‐BDC@Fe3O4 nanohybrid are mixed‐valence MOFs, which could directly oxidize 3,3′,5,5′‐tetramethylbenzidine (TMB) into oxTMB without the presence for H2O2. Significantly, the coupling of both Fe3O4 nano‐magnetic fluid and Ce‐BDC MOF exhibits 0.25‐fold higher catalytic activity than Ce‐BDC MOF under the same conditions, indicating that the synergistic enhancement occurred in the catalytic activity. This boost is benefited from the more superoxide radicals (O2•−) and then more hydroxyl radica (•OH) with the deposition of Fe3O4 nano‐magnetic fluid, which was generated by Ce‐BDC@Fe3O4 nanohybrid as both oxidase and peroxidase mimics. In view of high catalytic activity and easy recovery by applying an external magnet, a novel, simple and sensitive Vitamin C colorimetric detection could come true in the wide range (0–120 μM) with a correlation coefficient (R2) of 0.995.