Herein, we report a novel composite material of Nb₂O₅@MIL–125 that exhibited enhanced photoreduction of hexavalent chromium. The composite material was fabricated through an impregnation approach, which comprised of a two-step hydrothermal synthesis. As-prepared Nb₂O₅ nanospheres exhibited very poor charge separation; MIL–125 (Ti) which is a Ti-based metal-organic framework was introduced into the lattice of the spheres to improve charge recombination rate. The synthesized material’s phase, crystallinity, textural and morphological studies were investigated utilizing XRD, Raman, TEM, SEM, and EDS, respectively. While the optical and photoelectrochemical behavior of the samples were obtained from UV–vis–DRS, PL, and EIS data. This data combined, illustrated the successful formation of a functional and effective heterointerface between Nb₂O₅ and MIL–125 (Ti). Ti introduced as the MOF in the lattice of Nb₂O₅ had an essential synergetic effect as the composite bearing the highest mole ratio of Ti showed higher effective photoreduction of hexavalent chromium. This was further complemented the PL and XPS data which highlighted the Nb–MIL–125 (2–3) composite to have excellent charge separation and rapid photoreduction of chromium.

在此，我们报告了一种新型的Nb ₂ O ₅ @ MIL–125复合材料，该材料具有增强的六价铬光还原作用。通过浸渍方法制造复合材料，该方法包括两步水热合成。制备的Nb ₂ O ₅纳米球的电荷分离非常差；MIL-125（Ti）是一种基于Ti的金属有机骨架，被引入球体晶格中以提高电荷复合率。分别使用XRD，拉曼，TEM，SEM和EDS研究了合成材料的相，结晶度，组织和形态研究。而样品的光学和光电化学行为是从UV-vis-DRS，PL和EIS数据获得的。结合这些数据，可以说明在Nb ₂ O ₅和MIL-125（Ti）之间成功形成了功能有效的异质界面。Ti作为MOF引入Nb ₂ O ₅晶格中具有重要的协同作用，因为具有最高摩尔比的Ti的复合材料显示出更高的六价铬有效光还原性能。这进一步补充了PL和XPS数据，突出显示了Nb-MIL-125（2-3）复合材料具有出色的电荷分离和快速的铬光还原性。