Insight into Design of MIL‐125(Ti)‐Based Composite with Boosting Photocatalytic Activity: The Embedded Multiple Fe Oxide Count

Abstract The metal–organic frameworks (MOFs) exhibit poor stability especially under solution phase and high temperature, which compromises their practical application and functionalized modification. So, it is still challenging and imperative for the development of desirable design for the MOF‐functionalized material. Herein, the rational design and construction of MIL‐125(Ti)‐based Fe oxide composite (HPMIL‐125(Ti)‐Fe) are demonstrated. First, the ideal host HPMIL‐125(Ti) with eligible pore size, great stability, and hierarchical porosity is constructed through a facile one‐step pyrolysis. Then, the Fe oxide nanostrips are uniformly embedded into their porous channel along the axis through adsorption and thermally triggered phase transition processes. The unique design integrates 2D iron oxide semiconductor structure into 3D cake‐like hierarchical pore MIL‐125(Ti) kernel. The excellent photocatalytic activity of the as‐fabricated product, which is nearly 4.9 times than that of pristine HPMIL‐125(Ti), is evaluated by photocatalytic oxidation of As(III). Such a great improved photocatalytic performance is principally attributed to the narrowed bandgap, the decreased recombination rate of photoinduced electron–hole pairs, and large surface area with plentiful active species for As(III) photocatalytic oxidation. This contribution may brighten up an extra orientation for developing a more facile and practical strategy of fabricating MOF‐based composites.