| abstract |
(57) [Problem] To provide a method for stably producing only brookite type titanium dioxide. SOLUTION: Amorphous titanium dioxide is added to an aqueous solution of sodium hydroxide, and the molar ratio of Na 2 O / (Na 2 O + TiO 2 ) is 0.15 to 0.45. And the TiO 2 concentration is adjusted to 1 to 40 g / l, and the mixture is By hydrothermal treatment at a temperature of 150 to 300 ° C, only brookite-type titanium dioxide is produced without coexisting other polymorphs. |