Graphene-based magnetic metal organic framework nanocomposite for sensitive colorimetric detection and facile degradation of phenol

Phenol is a toxic and widely spread as environmental pollutants; the sensitive detection and efficient removal are quite important but challenging. Herein, we take the intrinsic advantages of graphene-based magnetic metal organic framework (MOF) composite as mimic enzyme sensor and Fenton-like catalyst for the colorimetric detection and degradation applications. In this work, magnetic Fe3O4 decorated graphene MOF composite (Fe3O4/rGO/MOF) was fabricated by a simple strategy for the purpose of well-distributed porous MOF on basal planes of magnetic graphene. The adhesive coating of tannic acid film on both side of magnetic graphene was explored as the directing agent for the controllable self-assembly of MOF. Interestingly, the Fe3O4/rGO/MOF represent excellent mimic enzyme properties, which can detect phenol based on a visual colour change in water solution. The mimic enzyme senor can oxidize 4-aminoantipyrine in the presence of H2O2 and exhibit strong affinity and selectivity in phenol detection. Simultaneously, Fe3O4/rGO/MOF also display high degradation ability towards phenol removal. These results indicate that the bifunctional composite can act both as calorimetric senor and Fenton-like catalyst, it would facilitate the real-time monitoring of water quality and wastewater treatment. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.