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

  • Xiaomeng Lü (a1), Danjun Mao (a1), Xiaojun Wei (a1), Hui Zhang (a1), Jimin Xie (a1) and Wei Wei (a1)...

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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a)Address all correspondence to this author. e-mail: xiejm391@sohu.com

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

  • Xiaomeng Lü (a1), Danjun Mao (a1), Xiaojun Wei (a1), Hui Zhang (a1), Jimin Xie (a1) and Wei Wei (a1)...

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