Preparation And Properties Of Ionic Liquid-assisted Yttrium And Nitrogen Co-doped TiO 2 Nanotubes

TiO₂ nanotubes is n type inorganic photosensitive semiconductor materials,which has widely used in wastewater degradation, because of its larger specific surface area and stronger adsorption ability. The preparation of TiO₂ with a wide range of light response and high utilization of visible light is the prerequisite to achieve widespread application. Therefore, this paper attempts using ionic liquid assist prepare Gd,N/TiO₂, to expand the scope of its optical response, improve its utilization of solar energy, and used to study the degradation of methylene blue.TiO₂ nanotube arrays were prepared by anodic oxidation, discussed the impacts of oxidation voltage, oxidation time, HF content and annealing temperature on the morphology, chemical structure, crystal type and photocatalytic properties, by using SEM, XRD, XPS, FT-IR, DRS and photocatalytic test to characterization and analysis. The results showed that the optimum conditions were: oxidation voltage 20 V, oxidation time 90 min, 0.4wt% HF, 450 annealing?. Under 150 W xenon lamp, the degradation rate of 5mg/L methylene blue?MB? was 45.74%. Based on this condition, ionic liquid?1-butyl-3-methylimidazolium tetrafluo- roborate [BMIM] BF4? assisted prepare TiO₂ nanotube arrays. Discussing the impacts of ionic liquid on the morphology, chemical structure, crystal type and photocatalytic properties of TiO₂ nanotube arrays. Through the experiment to determine the best addition amount was 0.3vol% [BMIM]BF4, the degradation rate was 64.02% within 120 min. Ionic liquid assisted prepare Gd,N/TiO₂, through the experiment to determine the best addition amount was 0.3vol% [BMIM]BF4 and 0.005mg/L Gd?NO3?3, the degradation rate was 69.89% within 120 min.The factors of TiO₂ nanotube arrays degraded methylene blue were studied. Discussing the factors that the light sources, ventilation, p H and the initial concentration of methylene blue solution, affected the photocatalytic effect. The results showed that the different light sources made the degradation rate of methylene blue solution different; ventilation was beneficial to improve the degradation rate of methylene blue solution. Using TiO₂ nanotube arrays as photocatalysts for degradation of methylene blue solution reaction with the first-order kinetics...