TiO₂ Nanoparticles Anchored onto the Metal–Organic Framework NH₂‑MIL-88B(Fe) as an Adsorptive Photocatalyst with Enhanced Fenton-like Degradation of Organic Pollutants under Visible Light Irradiation

A convenient one-step solvothermal process to construct TiO₂ nanoparticles anchored onto NH₂-MIL-88B­(Fe) with enhanced adsorption capacity and photocatalysis performance was reported. The TiO₂@NH₂-MIL-88B­(Fe) (abbreviated to SU-x) exhibited excellent adsorption and photodegradation performance toward methylene blue (MB) from simulated wastewater under the irradiation of visible LED light. The enhanced catalytic capability can be mostly attributed to the improved adsorption performance and efficiently photogenerated electrons transported to the conduction band of TiO₂ from that of NH₂-MIL-88B­(Fe). The synergistic effect of TiO₂ and NH₂-MIL-88B­(Fe) was verified by the photocurrent response and electrochemical impedance spectroscopic analysis. Moreover, the efficiency of the photocatalyst was not significantly reduced even after being recycled 5 times, showing the good stability and reusability of TiO₂@MOF. These bifunctional TiO₂@MOF composites thus display excellent adsorption capability, efficient charger carrier separation, and favorable stability, providing new insights into the preparation of composite materials based on Fe-MOF with high efficiency for photocatalytic environmental remediation.