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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.

Type
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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