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Rapid Microwave–Hydrothermal Synthesis of Anatase Form of Titanium Dioxide
Author(s) -
Baldassari Sara,
Komarneni Sridhar,
Mariani Emilia,
Villa Carla
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.1551-2916.2005.00562.x
Subject(s) - anatase , brookite , sulfuric acid , crystallization , titanium tetrachloride , hydrothermal circulation , titanium dioxide , materials science , titanium , chemical engineering , inorganic chemistry , hydrothermal synthesis , nuclear chemistry , chemistry , photocatalysis , metallurgy , organic chemistry , catalysis , engineering
Pure anatase titanium dioxide was synthesized by a microwave (MW)‐assisted hydrolysis of diluted acidic solutions of titanium tetrachloride. MW irradiation combined with hydrothermal process has proved to be a very efficient and fast alternative to conventional hydrothermal technique, as an almost complete crystallization of anatase occurred in reaction times as short as 30 min. The addition of small amounts of sulfuric acid was necessary to obtain a pure anatase phase, as the presence of sulfate prevented the crystallization of trace amounts of brookite. Transmission electron micrographs showed nanoparticles arranged in spherical aggregates with 1% sulfuric acid, while less aggregated nanoparticles were obtained with 0.1% sulfuric acid.