Polyoxometalate-based Metal-organic Frameworks For Catalytic Degradation Of Phenol And Mechanism Study

Crystalline POM@MOFs hybrids are very promising for catalysis,due to catalytic active POMs dispered at molecular level and enhanced stability of both POMs and MOFs.The reported catalytic oxidation functions of POM@MOFs catalysts were based on POMs as the only active site,while POM@MOFs catalyst boosting catalytic oxidation reaction with double actives sites(metal nodes in MOFs and POMs)have never been reported.Herein,we encapsulated HPW into MOFs HKUST-1 through facile liquid-assisted grinding method,and applied the obtained NENU-3N nanocrystals as catalysts in the degradation of phenol.It is the first time of Liquid-assisted grinding was applied in the preparation of nanocrystalline POM@MOFs hybrids.The NENU-3N nanocrystals cooperatively catalyzed the degradation of phenol on the basis of both MOF and POM catalytic activities.Strikingly,high conversion and mineralization have successfully realized by perfect cooperative catalysis between POMs and Cu(II)nodes in MOFs in a wide pH range under mild condition.Moreover,comparative experiments suggest that the reduced size of NENU-3N catalyst is beneficial for improving its catalytic performance.Finally,the nanocrystalline POM@MOFs catalyst possesses high stability,which can be easily recovered and reused 5 times without loss of catalytic activity.