Abstract
In this work, an amino functionalized metal organic framework (MOF), MIL-125(Ti)-NH2, is modified by salicylaldehyde via Schiff-base reaction, and the grafted organic substituent is further coordinated with ferric ions to form a half-salen Fe(III) covalently functionalized MOF, MIL-125(Ti)-Sal-Fe. The as-prepared composite is evaluated by light-driven catalytic activation of peroxymonosulfate (PMS) for the degradation of tetracycline hydrochloride (TC). The results imply that the TC removal given by MIL-125(Ti)-Sal-Fe/PMS/light is >88.9% after 40 mins in a wide pH range from 3 to 9; still, the kinetic constant for the degradation reaction under the optimized condition is 0.03553 min−1, which is much higher than that of either decomposition conducted by MIL-125(Ti)-NH2 (0.01801 min−1) or salicylaldehyde modified MOF, MIL-125(Ti)-Sal (0.01987 min−1). The significant enhancement of the photocatalytic performance can be attributed to the ligand-to-metal charge transfer (LMCT) within the integrated half salen Fe(III) complex, highly accelerating the redox cycle from Fe(III) to Fe(II). Our study opens up a novel insight into the amelioration of MOF-based PMS activation.
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