Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 37, Pages 7990-7997Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm01497d
Keywords
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Funding
- National Nature Science Foundation of China [20777015]
- National Basic Research Program of China [2010CB732306, 2007CB613301]
- Fundamental Research Funds for the Central Universities
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A systematic morphological phase diagram of titania/titanate was determined by the most important synthesis parameters of reaction temperature and NaCl concentration via a facile one-step alkalescent approach. X-Ray diffraction and Raman spectroscopy were used to generally assess the phase composition and crystallite size of different titania/titanate samples, which were also used to investigate the phase transition behavior in connection with the synthesis parameters. Scanning/transmission electron microscopy was employed to characterize the morphology, size, and lattice plane, and to further elucidate the morphological evolution of the resulting products. According to the Ostwald's step rule, a phase transition mechanism was proposed based on our current systematic experimental results, which reveals the phase transitions from layered hydrogen titanate to anatase or brookite under hydrothermal treatment. The brookite-anatase composite exhibited excellent photocatalytic activity in the photodegradation of methyl orange, phenol and salicylic acid solution under UV irradiation.
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