| 摘要 |
The invention relates to a process for obtaining nanodispersed titanium dioxide, which can be used in processes for photocatalytic treatment and neutralization of natural and sewage waters, as well as in different branches of industry.The process includes the anodic treatment of metallic titanium in an electrolyte containing ammonium bifluoride, sulfuric acid, potassium-titanium oxalate and diethylene glycol in the following component ratio, g/L:ammonium bifluoride��2 ... 5sulfuric acid (1.84 g/cm3)�2 ... 3potassium-titanium oxalate�3 ... 5diethylene glycol��the rest,at a current density of 1...2.5 A/cm2, a voltage across the electrodes of 100...140 V, for 60...160 min, under isothermal conditions of temperature rising from 10 to 50?C (variant 1) or anodic treatment is carried out first in cold electrolyte at the temperature of 10...20?C, for 60...120 minutes, and then in electrolyte heated to a temperature of 30...50?C, for 20...40 minutes, followed by subsequent resumption of the cycle of anodic treatment (variant 2), the formed nanodispersed titanium dioxide is subjected to thermal treatment at 350à450?C, for 0.5à1.0 hours.
|
