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Tunable synthesis of enhanced photodegradation activity of brookite/anatase mixed-phase titanium dioxide

Published online by Cambridge University Press:  13 July 2012

Xiaomeng Lü ,
Danjun Mao ,
Xiaojun Wei ,
Hui Zhang ,
Jimin Xie  and
Wei Wei
Xiaomeng Lü
Affiliation:
Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, China
Danjun Mao
Affiliation:
Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, China
Xiaojun Wei
Affiliation:
Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, China
Hui Zhang
Affiliation:
Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, China
Jimin Xie*
Affiliation:
Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, China
Wei Wei
Affiliation:
Department of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang212013, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Using titanium sulfate, Ti(SO4)2, as precursor and sodium hydroxide, NaOH, as adjusting reagent, pure brookite, pure anatase, and mixed-phase titanium dioxide (TiO2) with tunable brookite/anatase ratios were synthesized via a hydrothermal process. The samples were characterized by x-ray diffractionspectrometry, ultraviolet-visible diffuse reflectance spectrometry, transmission electron microscopy, and Brunauer-Emmett-Teller measurement. Photocatalytic degradation of Rhodamine B in aqueous solution served as a probe reaction to evaluate the photocatalytic activity of the as-prepared nanocomposites under visible irradiation (λ > 400 nm). The mixed-phase TiO2 exhibits higher photodegradation activity than single phase TiO2. The sample with 63.1% brookite and 36.9% anatase shows the highest degradation activity. Possible mechanism attributing to the enhanced activity was proposed based on the strucutre and surface property of the samples.

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Articles
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 400 - 404
Copyright
Copyright © Materials Research Society 2012

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