Visible light (VL) active titania was prepared via ambient condition sol process. The particles precipitated from titanium tetrachloride solution followed by lattice dehydroxylation using hot -methylpyrrolidone (NMP) yielded a mixed crystal phase of brookite titania with anatase as the minor phase. The mixed phase titania exhibited superior photocatalytic activities for an organic dye and hydrogen evolution from an aqueous solution under VL as compared with several other available reference titanias. The superior VL photocatalytic activity may be explained as the effective charge separation by the intercrystalline electron transport from brookite to anatase grains complemented by the strong VL absorption by the nitrogen species in NMP. The probable electron transport mechanism is illustrated.
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March 2009
Research Article|
March 20 2009
Visible light photocatalytic properties of polymorphic brookite titania
Burtrand I. Lee;
Burtrand I. Lee
a)
1School of Materials Science of Engineering,
Clemson University
, Clemson, South Carolina 29634, USA
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Sujaree Kaewgun;
Sujaree Kaewgun
1School of Materials Science of Engineering,
Clemson University
, Clemson, South Carolina 29634, USA
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Wooyul Kim;
Wooyul Kim
2Department of Chemical & Environmental Engineering,
Pohang University of Science & Technology (POSTECH)
, Pohang, Republic of Korea
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Wonyong Choi;
Wonyong Choi
2Department of Chemical & Environmental Engineering,
Pohang University of Science & Technology (POSTECH)
, Pohang, Republic of Korea
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Jae S. Lee;
Jae S. Lee
2Department of Chemical & Environmental Engineering,
Pohang University of Science & Technology (POSTECH)
, Pohang, Republic of Korea
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Eunsun Kim
Eunsun Kim
2Department of Chemical & Environmental Engineering,
Pohang University of Science & Technology (POSTECH)
, Pohang, Republic of Korea
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Burtrand I. Lee
1,a)
Sujaree Kaewgun
1
Wooyul Kim
2
Wonyong Choi
2
Jae S. Lee
2
Eunsun Kim
2
1School of Materials Science of Engineering,
Clemson University
, Clemson, South Carolina 29634, USA
2Department of Chemical & Environmental Engineering,
Pohang University of Science & Technology (POSTECH)
, Pohang, Republic of Koreaa)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
J. Renewable Sustainable Energy 1, 023101 (2009)
Article history
Received:
November 03 2008
Accepted:
February 17 2009
Citation
Burtrand I. Lee, Sujaree Kaewgun, Wooyul Kim, Wonyong Choi, Jae S. Lee, Eunsun Kim; Visible light photocatalytic properties of polymorphic brookite titania. J. Renewable Sustainable Energy 1 March 2009; 1 (2): 023101. https://doi.org/10.1063/1.3096606
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