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Anatase‐Type TiO 2 and ZrO 2 ‐Doped TiO 2 Directly Formed from Titanium(III) Sulfate Solution by Thermal Hydrolysis: Effect of the Presence of Ammonium Peroxodisulfate on their Formation and Properties
Author(s) -
Hirano Masanori,
Ota Keisuke,
Ito Takaharu
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00596.x
Subject(s) - anatase , crystallite , rutile , materials science , titanium , inorganic chemistry , photocatalysis , ammonium hydroxide , nuclear chemistry , chemical engineering , chemistry , metallurgy , catalysis , organic chemistry , engineering
Anatase‐type TiO 2 powder containing sulfur with absorption in the visible region was directly formed as particles with crystallite in the range 15–88 nm by thermal hydrolysis of titanium(III) sulfate (Ti 2 (SO 4 ) 3 ) solution at 100°–240°C. Because of the presence of ammonium peroxodisulfate ((NH 4 ) 2 S 2 O 8 ), the yield of anatase‐type TiO 2 from Ti 2 (SO 4 ) 3 solution was accelerated, and anatase with fine crystallite was formed. Anatase‐type TiO 2 doped with ZrO 2 up to 9.8 mol% was directly precipitated as nanometer‐sized particles from the acidic precursor solutions of Ti 2 (SO 4 ) 3 and zirconium sulfate in the presence and the absence of (NH 4 ) 2 S 2 O 8 by simultaneous hydrolysis under hydrothermal conditions at 200°C. By doping ZrO 2 into TiO 2 and with increasing ZrO 2 content, the crystallite size of anatase was decreased, and the anatase‐to‐rutile phase transformation was retarded as much as 200°C. The anatase‐type structure of ZrO 2 ‐doped TiO 2 was maintained after heating at 1000°C for 1 h. The favorable effect of doping ZrO 2 to anatase‐type TiO 2 on the photocatalytic activity was observed.