3.1 Structure and morphology
The XRD pattern of as-prepared material was presented in Fig. 1a . It showed the characteristic peaks at a range of 5° ~ 30°, which were in good agreement with that of MIL-100(Fe) 32, indicating that the MIL-100(Fe) was successfully synthesized by this method. The size of as-prepared MIL-100(Fe) was c.a. 300 nm (Fig. 1b ), which agreed with an average diameter of 242(±52) nm measured by DLS (Fig. S1). In addition, the specific surface area, total pore volume and porosity of as-prepared MIL-100(Fe) were 1344 m2·g-1, 0.727 cm3·g-1 and 89.7%, respectively (Fig. S2 and Table S1 ).