Novel route to prepare hydrous titania with electronic grade and high specific surface area from industrial titanyl sulfate solution

Hydrous titania with electronic grade and high specific surface area was prepared by adjusting hydrolysis conditions from industrial TiOSO₄ solution, establishing solid foundation for its application in electronics industry such as high-frequency capacitors, ceramic dielectric capacitors, and PTC thermistors, etc. The effects of hydrolysis conditions such as total TiO₂ concentration and Fe/TiO₂ ratio on the compositions and structures of hydrous titania were investigated. The total TiO₂ concentration and Fe/TiO₂ ratio affected the nucleation, crystallization, growth and aggregation of hydrous titania, resulting in changes in the crystal size, subsequently affecting its particle size distribution, impurity content, specific surface area for the hydrous titania. High Fe/TiO₂ ratio led to anisotropic shrinkage of the crystal structure for hydrous titania, and reduced its crystal plane spacing. Under the interaction between sulfate ions with chelating bidentate coordination structure and water molecules, the hydrous titania particles accumulated to form the pore structure. When the total TiO₂ concentration was of 160-170 g/L and the Fe/TiO₂ ratio of 0.53, electronic grade hydrous titania could be produced with specific surface area of 328 m²/g, median diameter size of 0.89 μm, TiO₂ content of 99.78 %.