Synthesis And Photocatalytic Properties Of Nano-TiO₂ And Its Quinacridone Composites

TiO₂ was widely used because of the special semiconductor properties.Nano-TiO₂,as a kind of new functional materials,has become the most promising photocatalyst.However,titanium dioxide itself has some unavoidable shortcomings.In order to overcome these shortcomings,researchers have explored a variety of approaches including changing the morphology of TiO₂ and doping TiO₂ with other elements.The current research showed that the titania nanotubes?TiNT?possess better photocatalytic performance than titanium dioxide nanoparticles?TiNP?.Quinacridone?QA?is not only a widely used pigment,but also a photosensitive material.Because of its excellent photosensitive properties,the Quinacridone has a widely applications in the solar energy-sensitive battery.Therefore,in this paper we used the titanium dioxide nanoparticles as raw material,the titania nanotubes,hierarchical flower-like titania?HFT?and quinacridone @ titanium dioxide nanotubes?QATi?composite material have been synthesised.The main work is as follows:?1?Anatase titanium dioxide as raw material,in strong alkali solution,through the hydrothermal synthesis of HFT.then,the SEM,TEM,XRD,FITR and TG were used to characterize and adsorption capacity of methylene blue?MB?and the photocatalytic performance under the irradiation of ultraviolet light also were investigated.The results show that the synthesized sample is a multi-layered flower structure formed by one-dimensional nanosheets as a petals and monoclinic Na₂Ti₃O₇ structure.Adsorption rate of 30 mg of flower materials on 100 ml 20 mg/L methylene blue is 85% in 30 minutes,and the total degradation yield of methylene blue reached up to 99% in 90 minutes.?2?In the alkali solution,TiNT was synthesized by hydrothermal method.Then,the as-synthesized nanotubes were characterized by SEM,TEM and a series of instruments.The photodegradation of MB with TiNT samples as photocatalysts was investigated under ultraviolet.Results show that the nanotubes were wound together with each other and monoclinic structure of layered hydrogen titanates.Moreover,under the irradiation of ultraviolet light,the photocatalytic activity of TiNT on methylene blue was very high.When the reaction time was 110 minutes,the photodegradation rate reached about 99%,and the effect of recycling was also ideal.?3?QATi composite was synthesized by one-pot hydrothermal method,thechemical structure,crystal structure,morphology,surface properties,thermal stability,and optical absorption were characterized.Photodegradation of MB with QATi as photocatalysts under UV-light and Vis-light was investigated.Results revealed that QATi showed short nanotube morphology and monoclinic structure of layered hydrogen titanates.With the formation of hydrogen bond net between QA and TiO₂ nanotubes,the adsorpation of light and the transfer and separation of photogerated charge were improved,and QATi showed excellent photodegradation activities with the total degradation yield of MB reached up to 99.9% in 80 minutes under UV irradiation and 96.3% in 120 minutes under sunlight irradiation.