NANOTUBULAR MATERIALS CRYSTALLISING IN SYSTEM OF K₂O-TiO₂-X-H₂O (X=NiO, MgO, Al₂O₃, Cr₂O₃, Co₂O₃, Fe₂O₃) AND METHOD OF THEIR SYNTHESIS

摘要

FIELD: chemistry.;SUBSTANCE: nanotubular materials crystallising in the system of K₂O-TiO₂-X-H₂O (X=NiO, MgO, Al₂O₃, Cr₂O₃, CO₂O₃, Fe₂O₃) are characterized by the fact that in their composition up to 10% of ions Ti⁴⁺ is replaced by doping two- or trivalent metal. The method of synthesis of nanotubular materials is characterized by the fact that the synthesis of the samples is carried out by hydrothermal treatment of a pre-prepared mixture of hydroxide in KOH solution, to produce the initial mixtures of hydroxides, a solution of titanyl chloride synthesised by reactionof TiCl₄ with chilled distilled water, is mixed with aqueous solutions of salts of finished elements in a predetermined ratio, and then the precipitation of hydroxides is produced by adding NH₄OH to the aqueous solution mixture at pH=9-9.5 followed by washing with distilled water, drying at 70-90°C and mechanical crushing, then the crushed precipitate is mixed with 10 M KOH solution and subjected to a hydrothermal treatment at 170-180°C for, at least, 24 hours, after which the resulting product is washed with distilled water.;EFFECT: invention makes it possible to synthesise potassium-titanate nanotubes with an average outer diameter of 5 to 12 nm.;2 cl, 5 dwg, 2 ex