Magnetic MXene based metal organic frameworks composites: Synthesis, characterization and application

Triazole fungicides are the most frequently used in preventing and controlling rice blast due to their high efficacy, broad spectrum and long effective duration. However, serious environmental problems might be posed by these agricultural chemical’s residues. In this work, a novel magnetic composite (Fe 3 O 4 @MXene@MOF-74) was synthesized by a facile strategy and applied to remove triazole fungicides. Specifically, the morphology and property of this prepared material was analyzed by a series of characterizations. The adsorption performances were systematically investigated, and the maximum adsorption capacity towards epoxiconazole and tebuconazole were 120.96 and 108.26 mg g −1 , respectively. The adsorption process could be described by pseudo-second-order kinetic model and Langmuir isotherm model, and the adsorption mechanism was predominantly determined by hydrogen bonding, covalent bonding and π-π stacking, along with electrostatic and physical interaction. In actual application, the satisfactory removal performances were obtained in paddy field water samples. Finally, it is worth mentioning that Fe 3 O 4 @MXene@MOF-74 was proved to have antibacterial activity, and the effective concentration for 50% inhibition (EC 50 ) value against mycelium growth of Magnaporthe grisea Barr. was 0.70 g L −1 . Consequently, bi-functional properties of excellent adsorption performance and antibacterial activity make Fe 3 O 4 @MXene@MOF-74 a great potential in paddy field applications. • Fe 3 O 4 @MXene@MOF-74 composite as a new adsorbent for removal of triazole fungicides. • Outstanding adsorption performance was obtained in paddy field water samples. • The adsorbent possesses antibacterial activity owing to MXene and MOF-74. • A promising candidate applied in paddy field based on bi-functional adsorbent.