Mesoporous wide bandgap semiconductors offer high photocatalytic oxidation and mineralization activities. In this study, mesoporous β-Ga 2O 3 diamond nanorods with 200-300nm in diameter and 1.0-1.2μm in length were synthesized via a urea-based hydrothermal method using polyethylene glycol (PEG) as template agent. The UV photocatalytic oxidation activity of β-Ga 2O 3 for gaseous toluene was evaluated, and 7 kinds of intermediates were monitored online by a proton transfer reaction mass spectrometry. Photoluminescence spectra manifested that the dosage and molecular weight of PEG are crucial for formation of vacancies and photocatalytic oxidation activities. A PEG-assisted hydrothermal formation mechanism of mesoporous β-Ga 2O 3 diamond nanorods was proposed. Based on the health risk influence index (η) of the intermediates, the calculated health risks revealed that the β-Ga 2O 3 nanorods with a η value of 9.6 are much safer than TiO 2 (η=17.6).
Bibliographical noteFunding Information:
This research was partially funded by the Zhejiang Provincial Natural Science Foundation of China (Grant No. Y5090149 ), the Chinese Key Technology Research and Development Program of the Eleventh Five-Year Plan (Grant No. 2006BAJ02A08 ), and the National Technology Research and Development Program (“863” Program) of China (Grant No. 2007AA061402 ).
- Indoor air
- β-Ga O