Light-induced synthesis of Fe-Fumaric acid (MIL-88A) was based on previous reported literature with slight modification. Initially, 4 mmol of FeCl3•H2O and 4 mmol of fumaric acid were dissolved individually in 1 mL of DMF. Then, the two solutions were mixed, heated with a 660 nm LED (8 W/cm 2 ) for 4 h at 100 °C. The solid MOF was collected after the reaction by centrifugation, washed with fresh DMF for twice and methanol for three times.