Prepare TiO₂/MMT Composite Material Doping With Rare Earth Ions And Study Its Properties

TiO₂ semiconductor is the most ideal photocatalytic material, which is expected to be applied in the field of wastewater treatment, But because its shortcomings of large band gap and electron hole easily composite, it will affect its practical application, However, Montmorillonite is layered silicate clay mineral, which has good adsorption properties and certain significance and value in the field of sewage processing. In this paper, Firstly, Natural Ca-montmorillonite of Chifeng’s Ningcheng in Inner Mongolia was modifed by sodium, Then Na-montmorillonite was regarded as the carrier to prepare the TiO₂/montmorillonite composite materials and TiO₂/montmorillonite doping with rare earth ions composite materials by sol-gel method and hydrothermal method respectively, And study their microscopic structure and spectral properties by the characterization methods of XRD, BET, FT-IR, Uv-vis,SEM, XPS, Finally, Methyl orange and Congo red was used as the simulated dye wastewater to study their photocatalytic properties and adsorption properties, the results were summarized as follows:（1） Na-montmorillonite was regarded as carrier material, Butyl titanate was used as the titanium source to prepare a series of TiO₂/montmorillonite composite materials by sol-gel method. Through structural characterization to indicate the TiO₂ and montmorillonite has obvious interaction of composite, And the composite effectively restrain the transformation of TiO₂ crystal structure and the increase of TiO₂ grain size to improve the photocatalytic properties of the system, Next regarding the methyl orange as the goal pollutant to test its photocatalytic performance. The degradation rate of methyl orange solution can reach 96.36% after two hours of UV light irradiation.（2） Preparing TiO₂/montmorillonite doping with 1% of different rare earth ions composite materials by the sol-gel method, The results show that the doping of rare earth ions La3+, Nd3+ and Eu3+can decrease the grain size of TiO₂ of composite photocatalytic system, Then improve the photocatalytic properties of the system,When the doping amount of rare earth La3+was 1% and the calcination temperature was 500 degrees, Composite material for methyl orange degradation rate was the highest. the degradation rate is up to 97.07% after two hours of UV light irradiation.（3） Na-montmorillonite was regarded as the carrier, Titanium sulfate was used as the titanium source to prepare a series of TiO₂/montmorillonite composite material by hydrothermal method, Then congo red solution was used as simulated dye wastewater to study their adsorption properties. The results indicate that the specific surface area of TiO₂/ montmorillonite composite material which was prepared by hydrothermal method can reach up to 261.03 m2/g, the most probable pore diameter is 3.57 nm, and all of them has Langmuir type curve, And they appeares obvious H3 hysteresis loop in the relative pressure 0.1¹.0, which have mesoporous structure, Their has good adsorption properties for the Congo red solution, the maximum adsorption capacity can reach 344.8 mg/g.（4） Montmorillonite modified by rare earth La3+was regarded as the carrier,Titanium sulfate was used as the titanium source to prepare a series of La3+-MMT/TiO₂ composites materials by hydrothermal method, Then using Congo red solution as the target pollutant to study their adsorption properties, The results show that the adsorption rate for congo red solution of 50mg/L can reach 85.2% and the limit adsorption capacity can reach 277.8 mg/g after two hours.