Layered Compounds K <sub> 2 </ Sub> Ln <sub> 2 </ Sub> Ti <sub> 3 </ Sub> O <sub> 10 </ Sub> And Its Composite Material Preparation And Photocatalytic Activity Study

Layerd material is one of important functional material, and is widely applied in the fields such as ion-exchange, adsorption, conduction, separation, catalyse, because of it's peculiar layerd configuration and chemical reaction activity in interlayer space.Layered perovskite-type compound K₂Ln₂Ti₃O₁₀ (Ln= La, Ce, Pr, Nd, Sm, Eu, Gd) were prepared by microemulsion method, the obtained products were characterized by XRD, TEM, LAM, FT-IR and UV-Vis spectra. Crystal structures of K₂Ln₂Ti₃O₁₀ (Ln= La, Ce, Pr, Sm, Eu) were resolved by Fullprof procedure. It was found that K₂Ln₂Ti₃O₁₀ was changing from a mediate state-KLn₂Ti₃O_9.5 in the preparation of K₂Ln₂Ti₃O₁₀. A series of compounds KLn₂Ti₃O_9.5 (Ln=La, Nd, Sm, Dy, Er) were prepared by microemulsion method, the results indicated that KLn₂Ti₃O_9.5 was square-like and the average size was ca. 20nm, had higher BET surface area and unique layered structure similar to the aim products. The obtained products are a new kind of perovskite-type layered compounds.The interlayer reaction process, such as acid-exchanging, alkylamine and inorganic particle intercalating process of K₂Ln₂Ti₃O₁₀. Al₂O₃ and TiO₂ pillared layerd compound showed that the BET surface area was about 153.3m²Â·g^-1, thermal stability was over 700℃. The investigation on their catalytical behavior based on the decomposition of methyl orange under UV-Vis light suggests the catalytic activities were greatly enhanced by TiO₂ pillaring process, decomposition of methyl orange is 94% in 120 min.