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Enzyme‐Assisted Synthesis of Titania under Ambient Conditions
Author(s) -
Katagiri Kiyofumi,
Inami Hitoshi,
Ishikawa Tomohide,
Koumoto Kunihito
Publication year - 2009
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.1551-2916.2008.02685.x
Subject(s) - brookite , anatase , calcination , titanium , catalysis , lipase , aqueous solution , phase (matter) , amorphous solid , chemistry , materials science , inorganic chemistry , aqueous two phase system , chemical engineering , photocatalysis , nuclear chemistry , enzyme , organic chemistry , engineering
A low‐temperature procedure for the synthesis of TiO 2 was developed using a water‐soluble titanium complex and enzymes. Titanium–lactate and titanium–glycolate complexes were used as precursors of TiO 2 . Digestive enzymes were chosen as biocatalysts for the synthesis of TiO 2 in aqueous solutions. TiO 2 powders were deposited from reaction solutions having optimal pH values for the enzymes to exhibit their catalytic activities for their original substrates. TiO 2 has been synthesized by an enzymatic reaction in an aqueous solution under ambient conditions. The XRD measurements indicated that TiO 2 powders thus obtained usually have an amorphous phase. However, after calcination at 550°C, the anatase phase was confirmed. Interestingly, the minor phase of TiO 2 , brookite, was found in the sample obtained from the titanium–glycolate complex catalyzed by lipase at pH 10 after calcination at 550°C.