P Reparation And Properties Of Rare Earth Ions Doped M Esoporous Ti〇2 Nanom Aterials In Response To Visible Light

As one of the ideal light catalysts, titanium dioxide(TiO2) nano material has excellent physical and chemical properties, but anatase type TiO2 has a larger width of band gap(3.2 eV) and low use of visible light, at the same time, a relatively high electron- are hole recombination rate is also often leads to lower the quantum yield,thus restrict its industrial application, therefore, research of TiO2 nanomaterials modified attracted much attention, among them, the mesoporous TiO2 nanometer materials with high specific surface area and adsorption performance and more the favour of people.This paper by sodium dodecyl sulfate(SDS) as template agent, using hydrothermal prepared a series of has a high catalytic activity of mesoporous TiO2 nanomaterials, study its microstructure, spectroscopyand light catalytic properties,and discusses the best preparation conditions. In order to further improve photocatalytic performance and light response range of the mesoporous TiO2 nanomaterials system, first of all, the preparation of the different rare earth ions doped mesoporous TiO2 nanomaterials and different mole ratio of La3+doped mesoporousTiO2 nanomaterials, then the preparation of the rareearth La3+ and F- ions co doped mesoporous TiO2 nanomaterials, study the microscopic structure,spectroscopy and optical catalytic properties, and obtained the following results:A, the preparation of mesoporous TiO2 nanomaterials with anatase type structure,the average particle size around 3.59 nm; specific surface area up to 192.71 m2g-1, and all belong to Langmuir type IV aperture structure, sample type of honeycomb structure on the whole, the aperture between 3 to 10 nm, the surface is not ordered mesoporous channel structure, but is formed by the accumulation of TiO2 nanoparticles small pore structure. The water thermal response time is 28 h and the template agent is 5 g, at this time mesoporous TiO2 nanomaterials ultraviolet light degradation of methyl orange solution was the highest rate and achieve 98.54% in 1 h.B, different doped with rare earth ions can effectively inhibit the growth of mesoporous TiO2 nanometer grain type and transformation, and can broaden the light response range of TiO2 photocatalytic system in different degrees; doped with rare earth ions can make surface increases of both samples, among them the sample of 1%La3+-TiO2 has the largest specific surface area up to 236.22 m2g-1; doped with rare earth ions can improve the performance of mesoporous TiO2 photocatalytic nanomaterials in 30 minutes on the photodegradation of methyl orange solution rate can reach 98.54%, and has certain visible light catalytic properties. Rare earth La3+ions doped best mole ratio is 1%, the optimal calcination temperature is 350℃.C, La3+ and F- rare earth ions doped can improve mesoporous TiO2 nanometer material system visible light catalytic activity and the visible light degradation rate of methyl orange solution within 60 min can reach 62.52%, and the preparation of solution pH value of mesoporous TiO2 nanomaterials system have a certain effect to visible light catalytic properties, When pH is 5 has the highest visible light photocatalytic activity, and visible light degradation of methyl orange solution rate can reach 81. 07%.