Oxygen-Deficient TiO2-δ Synthesized from MIL-125 Metal-Organic Framework for Photocatalytic Dye Degradation

Abstract

Two of the biggest limitations for titanium dioxide (TiO2) as a photocatalysis are the lack of visible light response and the need for higher surface areas in order to maximize sites where reactions can take place. In this work, a Metal-Organic Framework (MOF), specifically MIL-125, is employed as a template to produce TiO2 particles with high specific surface area and well-controlled porosity. When annealed under a hydrogen atmosphere to create an oxygen deficient TiO2−δ, which is black in appearance, enhanced photocatalytic properties are observed, importantly including a significant visible light response in the degradation of model pollutant Rhodamine B.

Metal-organic Framework-based Materials: Synthesis, Stability and Applications in Food Safety and Preservation

“…Pei and co-workers fabricated a calcium alginate and gelatin coated Cu-BTC MOF composite by using 3D printing, and suggested a MB adsorption efficiency of 99.8% within 20 min by 0.5 g of this 3D-printed Cu-BTC MOF composite from 50 mL of MB solution at an initial concentration of 20 ppm, which was significantly higher than the MB adsorption efficiency of only 43.6% by alginategelatin scaffolds without MOF. [258] Doping functionalized materials for MOF composite development such as celerium, [259,260] titanium, [261] fumarate, [262] TiO2, [263,264] cellulose nanofibrous, [265] and peroxidase, [266,267] as well as magnetic basic materials [268][269][270] were also demonstrated to successfully improve dye absorption and removal efficiency. The MOF composites were also applied in determination and removal of antibiotics.…”