Heterostructured Ag@MOF-801/MIL-88A(Fe) Nanocomposite as a Biocompatible Photocatalyst for Degradation of Reactive Black 5 under Visible Light

Heterostructured Ag@MOF-801/MIL-88A(Fe) nanocomposite was synthesized through template effects in metal–organic frameworks (MOFs). MIL-88A(Fe) was fabricated on a MOF-801 template using the internal extended growth method (IEGM) via polyvinylpyrrolidone (PVP) as the structure-director agent to create the MIL-88A(Fe)-on-MOF-801 heterostructure. The MOF-801/MIL-88A(Fe) heterostructure was used as a template for the formation of Ag nanoparticles (NPs) inside it via a double solvents method (DSM) combined with a photoreduction route (PR). To characterize synthesized samples to a high level of detail, PXRD, FT-IR, EDX, N2 adsorption–desorption isotherms, TEM, DRS, PL, EIS, and Mott–Sckottky measurements were used. The resulting Ag@MOF-801/MIL-88A(Fe) nanocomposite demonstrated the highest photocatalytic activity of 91.72% for the degradation of Reactive Black 5, after 30 min under visible light irradiation

Band Gap Engineering of MOF-801 via Loading of γ‑Fe₂O₃ Quantum Dots Inside It as a Visible Light-Responsive Photocatalyst for Degradation of Acid Orange 7

The band gap engineering technique based on the loading of γ-Fe2O3 quantum dots (QDs) inside a metal–organic framework-801 (MOF-801) porous matrix was utilized to fabricate a visible light-responsive MOF-based photocatalyst. The post-synthetic modification (PSM) approach was applied for loading of γ-Fe2O3 QDs inside the MOF-801 porous matrix so the γ-Fe2O3 QDs were immobilized inside the MOF-801 via the double-solvent method (DSM) combined with an in situ reduction route (ISRR), for the first time. The results showed that the absorption edge of the γ-Fe2O3QDs@MOF-801 nanocomposite was red-shifted to a longer wavelength than MOF-801, and the band gap energy of γ-Fe2O3QDs@MOF-801 was reduced to 3.1 eV compared to MOF-801 with a band gap energy of 4.4 eV; as a result, the γ-Fe2O3QDs@MOF-801 nanocomposite became photoactive to visible light. γ-Fe2O3QDs@MOF-801 showed a degradation efficiency of 84.15% for acid orange 7 after 180 min of visible light irradiation