Journal
JOURNAL OF MATERIALS RESEARCH
Volume 28, Issue 3, Pages 400-404Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2012.226
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Funding
- National Natural Science Foundation of China [21003065]
- Natural Science Foundation of Jiangsu Province [BK2010166]
- Industry High Technology Foundation of Jiangsu [BE2010144]
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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 (lambda > 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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