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.

Synthesis of Ce‐Doped MIL‐125‐NH2 for Promoting Catalytic H2O2 Production from Water and O2 under Visible Light Irradiation

“…The flat‐band potential of TiMOFs and Ce/TiMOFs‐0.010 derived from Mott‐Schottky plots are about −0.53 V and −0.44 V versus Ag/AgCl, respectively. So the LOMO of TiMOFs and Ce/TiMOFs‐0.010 can be estimated to be −0.43 and −0.34 V versus normal hydrogen electrode (NHE) [48] . Combined with the bandgap values obtained by Tanc plots, the electronic band structures of the two samples could be plotted and shown in Figure S10.…”

“…So the LOMO of TiMOFs and Ce/TiMOFs-0.010 can be estimated to be À 0.43 and À 0.34 V versus normal hydrogen electrode (NHE). [48] Combined with the bandgap values obtained by Tanc plots, the electronic band structures of the two samples could be plotted and shown in Figure S10. The highest occupied molecular orbital (HOMO) of TiMOFs and Ce/TiMOFs-0.010 are about 1.84 and 1.85 V, which are more positive than the potential for water oxidation (1.23 V versus NHE).…”

3D pill-structured Ti-MOF@S composite cathodes for high-performance Li–S batteries

“…The XRD pattern of the Ti-MOF obtained by the solvothermal method exactly corresponds to the simulation pattern of single crystal diffraction data reported before. 34 The characteristic peaks were obvious, indicating that the Ti-MOF has been successfully synthesized. In the XRD pattern of the Ti-MOF@S composites, the main characteristic peaks of the Ti-MOF were also evident, and the first three strong diffraction lines of sulfur correspondingly appeared without other miscellaneous peaks, which proves that nano-sized Ti-MOF@S composites were successfully prepared.…”

Inorganic-organic hybrid photocatalysts: Syntheses, mechanisms, and applications

“…Finally, a novel inorganic-organic hybrid photocatalyst was prepared. Gao et al [106] reported that MIL-125(Ti) was first transformed into hierarchical porous MIL-125(Ti) (HPMI-125(Ti)) via pyrolysis and Fe2O3 was then adsorbed onto HPMIL-125(Ti) to form HPMIL125(Ti)-Fe.…”