Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2014, Issue 12, Pages 2146-2152Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201301561
Keywords
Crystal engineering; Titanium; Surface chemistry; Phase transitions; Doping; Surface analysis; Photochemistry
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21031001, 51102082, 91122018, 21371053]
- Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China [708029]
- Program for Innovative Research Team in University [IRT-1237]
- Special Research Fund for the Doctoral Program of Higher Education of China [20112301110002]
- Youth Foundation of Heilongjiang Province of China [QC2013C009]
- supporting plan for the Excellent Youth of Common Universities of Heilongjiang Province of China [1251G045]
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Hierarchical N-doped TiO2 microspheres with exposed (001) facets [N-TiO2-(001)] were synthesized through a simple, fluorine-free solvothermal reaction with subsequent thermal treatment. The results show that the hierarchical N-TiO2-(001) microspheres are made up of numerous TiO2 nanosheets, and that isopropylamine (IPAN) acts as both the nitrogen source and the capping and shape-controlling agent that generates the high-energy (001) facets. In addition, IPAN is also effective in increasing the onset temperature of the phase transformation of TiO2 from anatase to rutile. Compared with the commercially available P25 TiO2, the as-prepared TiO2 microspheres exhibit good photocatalytic activity and high stability under visible-light irradiation. The high photocatalytic performance is derived from the synergy effect of N-doping and the separation of photogenerated electrons and holes among different facets, as evidenced by surface photovoltage spectroscopy.
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