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

Abstract

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.

Cu(ii)/Ni(ii)–organic frameworks constructed from the homometallic clusters by 5-(2-carboxyphenoxy)isophthalic acid and N-ligand: synthesis, structures and visible light-driven photocatalytic properties

“…[19][20][21][22] The development of MOFs has provided more opportunities for new photocatalysts, because of their diverse structures containing variable valence electrons and empty orbits of the metal center, high thermal and chemical stability. 23,24 Recently, MOFs have been demonstrated with a good photocatalytic activity for the degradation of organic dyes such as methyl orange, methylene blue and rhodamine B (RhB) under visible light irradiation. 15,19,[25][26][27][28][29] Due to the high importance of environment protection, how to effectively remove organic pollutants has become a hot social issue, leading to high demands for high-efficiency photocatalysts.…”

Bidentate carboxylate linked TiO2 with NH2-MIL-101(Fe) photocatalyst: a conjugation effect platform for high photocatalytic activity under visible light irradiation

“…3b presented the O 1s high resolution of TiO 2 @17%NH 2 -MIL-101(Fe), NH 2 -MIL-101(Fe) and TiO 2 . NH 2 -MIL-101 showed three peaks in O 1s spectra at 533.0, 531.8, and 530.7 eV, indicating the adsorbed water, oxygen components of the 2-aminoterephthalic acid and the Fe-O bonds, respectively [52]. The O 1s spectra of pure TiO 2 show two characteristic peaks at 529.9 and 531.0 eV (Fig.…”

Heterogeneous Fenton catalysts: A review of recent advances

“…Li et al . formulated a one-pot solvothermal synthesis method for the preparation of TiO 2 @MOF (TiO 2 @NH 2 -MIL88B-Fe) heterostructures (abbreviated as SU-3, where three stands for the optimal molar ratio of Ti: Fe) ( Li et al, 2018 ). The TiO 2 @MOF displayed enhanced photodegradation of methylene blue (MB) under visible LED light.…”

“…11 Schematic representation of adsorption and photocatalytic dye degradation on the SU-3 catalyst upon visible LED light irradiation. Reproduced with permission from ref ( Li et al, 2018 ). .…”