Synthesizing of Anatase Titanium Dioxide Microspheres via Hydrothermal Reaction at Low Temperature

Abstract

TiO₂ exists in three principal crystallographic forms (anatase, brookite and rutile), but only the anatase form is photocatalytically active and it is changes easily to a rutile-type one, so the technique to easily prepare high yield anatase TiO₂ is difficulty. In this present work, anatase TiO₂ microshperes were fabricated from 0.15 mol/L Ti(SO₄)₂ aqueous solution by adding urea (molar ratio urea/Ti 1/5) as additive at low-temperature (90°C) via hydrothermal treatment and characterized by SEM, XRD and TEM,the mechanism of forming microspheres was discussed also.

Keywords:

• Anatase TiO₂
• mcirospheres
• hydrothermal treatment
• additive
• mechanism