Preparation Of Metal Organic Framework And Titanium Dioxide Composite And Its Application In Organic Matter Treatment

Metal organic framework?MOF?is a new type of porous material,which has highly developed pore structure,large specific surface area and pore volume.Owing to their fascinating pore structures,MOFs have received great attention in various fields.Titanium dioxide?TiO₂?is a kind of semiconductor material with strong photocatalytic activity,under ultraviolet and visible light.Because of its excellent photocatalytic activity,good chemical and biological stability,strong oxidation ability,low energy consumption,TiO₂ was defined as the most excellent photocatalytic materials.This dissertation focuses on the fabrication and utilization of TiO₂@MOFs composites in the adsorption and decomposition of organic dyes study.The main content and innovation points are summarized as follows:?1?We report a simple method for preparation of TiO₂@MIL-100 composite based on a sol-gel reaction for the removal of rhodamine B?RhB?in water.The composite Ti O₂@MIL-100 has combined the excellent adsorption capacity of MIL-100 and the photocatalytic activity of TiO₂,which is of great importance to the removal of organic pollutants and the purification.In addition,the "molecule pump" prototype for exceptionally high efficiency adsorption and decomposition of RhB was based on TiO₂@MIL-100.The further research should focus on the improvement of a more controllable coating method,and fabricate TiO₂@MOF nanocrystals with unifom TiO₂ coatings rather than discrimination of total surface area compared to pure MOF.?2?TiO₂@MIL-101 Core-shell composite was prepared according to one-pot reaction with high temperature and high pressure,which contains anhydrous ethanol as the solvent and stabilizer,butyl titanate as the titanium source and MIL-101 as an additional material for the crystallization of TiO₂.Owing to its mumerous structures,tunable pore sizes,high surface areas and excellent removal efficiency to organic pollutant,TiO₂@MIL-101 has received great attention in diverse application.Compared to MIL-101,the TiO₂@MIL-101 composite not only demonstrated a high capacity in adsorption but also played an important role which facilitated the following degradation of organic dyes.?3?We report a simple method for preparation of TiO₂@MIL-53 core-shell composite and investigate the synergism of this composite for the adsorption and decomposition of nonionic organics dyes.The composite TiO₂@MIL-53 has combined the excellent adsorption capacity of MIL-53 and the photocatalytic activity of TiO₂,which is of great importance to the removal of organic pollutants and the purification.We also believe that the fabricated TiO₂@MOF-53 composite can further improve other MOF-TiO₂ composite applications in water pretreatment in the future.