Effect of CeO2 and Sb2O3 on the phase transformation and optical properties of photostable titanium dioxide

• Published in: Chemical papers Vol. 65; no. 2; pp. 203 - 212
• Main Authors: Gleń, Marta, Grzmil, Barbara, Sreńscek-Nazzal, Joanna, Kic, Bogumił
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Versita 01.04.2011; Versita
• Subjects: Biochemistry; Biotechnology; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Industrial Chemistry/Chemical Engineering; Materials Science; Medicinal Chemistry; modification; optical properties; Original Paper; phase composition; photostability; rutile; titanium dioxide; phase composition; titanium dioxide; optical properties; modification; photostability; rutile
• ISSN: 0366-6352; 1336-9075; 1336-9075
• DOI: 10.2478/s11696-010-0103-x

In the present work, the effect of individual additives calculated as molar fractions of Sb 2 O 3 and CeO 2 ( x Sb 2 O 3 range: 0.03–0.08 %, x CeO 2 range: 0.05–0.14 %), on the phase composition, phase transformation, and optical properties of photostable rutile titanium dioxide was studied using selective leaching method, ICP-AES technique, XRD method, spectrophotometric analysis and S BET measurements. The starting material was hydrated titanium dioxide. It was observed that the addition of Sb 2 O 3 to TiO 2 did not influence the anatase-rutile phase transformation, but increasing the CeO 2 addition caused a decrease in the rutilization degree. Thus, CeO 2 acted as an inhibitor of the TiO 2 phase transformation. Sb 2 O 3 addition to TiO 2 presumably caused the formation of a co-phase of Sb with Ti. Cerium formed a separate phase, CeO 2 , and reacted partly with titanium, probably creating co-phase, Ce 0.8 Ti 0.2 O 2 . Comparing the colour of modified rutile titanium dioxide according to the type of the additive introduced, it was found that TiO 2 with CeO 2 had higher brightness but lower white tone values when compared with TiO 2 modified with Sb 2 O 3 . The relative lightening power and grey tone of the modified TiO 2 were higher in TiO 2 modified with Sb 2 O 3 . The values of the photocatalytic activity measured in all TiO 2 samples modified either with Sb 2 O 3 or CeO 2 were very similar and varied around the value of 21.