期刊
APPLIED SURFACE SCIENCE
卷 536, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147953
关键词
Mixed-phase TiO2; Nitrogen doping; Cyclohexane oxidation; Photocatalysis
类别
资金
- National Natural Science Foundation of China [21676296]
- National Key Research and Development Plan [2016YFC0303704]
Nitrogen-doped anatase/rutile mixed-phase TiO2 photocatalysts with carbonaceous species were successfully fabricated using pyrolyzing and nitrogen doping, showing excellent photocatalytic performance. The optimized ratio of the catalyst exhibited significantly higher production yield compared to other samples, attributed to the enhanced visible-light absorption, effective separation of electron-hole pairs, and unique functions of carbonaceous species and porous structure.
Nitrogen-doped anatase/rutile mixed-phase TiO2 photocatalysts with carbonaceous species were successfully fabricated by pyrolyzing MIL-125 (Ti) and P25 composite as the precursor, and subsequently doping nitrogen into the pyrolysis product using urea as the dopant in a sealed reactor. Through varying the addition amount of P25 in the precursor, the ratios of anatase/rutile phases in the photocatalysts were conveniently adjusted. The photocatalysts showed excellent photocatalytic cyclohexane oxidation performances under visible light irradiation. The yield of the KA oil (cyclohexanol and cyclohexanone) reached 112.44 mu mol after 5 h illumination for the photocatalyst with the optimal anatase/rutile ratio (N-TiO2-3), which was 5.66 and 39.87 times that of N-TiO2-0 (nitrogen-doped anatase TiO2) and N-P25 (nitrogen-doped P25), respectively. In the meantime, the selectivity toward cyclohexanone could reach 100%. The influences of pyrolysis temperature and atmosphere on the microstructure of catalysts and resulting catalytic performances for cyclohexane oxidation were also investigated. The improved photocatalytic properties were attributed to the combined effects of the high visible-light absorption caused by nitrogen doping, valid separation of photogenerated electron-hole pairs derived from the mixed-phase junction, unique auxiliary function of carbonaceous species and porous structure. A possible photocatalytic mechanism was proposed according to the active species determined by trapping experiments.
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