Citation: Li Liang, Kaining Li, Kangle Lv, Wingkei Ho, Youyu Duan. Highly photoreactive TiO₂ hollow microspheres with super thermal stability for acetone oxidation[J]. Chinese Journal of Catalysis, ;2017, 38(12): 2085-2093. doi: 10.1016/S1872-2067(17)62952-8 shu

Highly photoreactive TiO₂ hollow microspheres with super thermal stability for acetone oxidation

Li Liang ^a,b, ,
Kaining Li ^a ,
Kangle Lv ^a ,
Wingkei Ho ^b ,
Youyu Duan ^a

a Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
b Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, N. T., Hong Kong, China

Received Date: 11 October 2017
Revised Date: 30 October 2017

Fund Project: This work is supported by the National Natural Science Foundation of China (51672312, 21373275), the Science and Technology Program of Wuhan, China (2016010101010018, 2015070504020220), and the Dean's Research Fund-04257 from the Education University of Hong Kong.

TiO₂ hollow microspheres (TiO₂-HMSs) have attracted much attention because of their high photoreactivity, low density, and good permeability. However, anatase TiO₂-HMSs have poor thermal stability. In this study, surface-fluorinated TiO₂-HMSs were assembled from hollow nanoparticles by the hydrothermal reaction of the mixed Ti(SO₄)₂-NH₄HF-H₂O₂ solution at 180℃. The effect of the calcination temperature on the structure and photoreactivity of the TiO₂-HMSs was systematically investigated, which was evaluated by photocatalytic oxidation of acetone in air under ultraviolet irradiation. We found that after calcination at 300℃, the photoreactivity of the TiO₂-HMSs decreases from 1.39×10^-3 min^-1 (TiO₂-HMS precursor) to 0.82×10^-3 min^-1 because of removal of surface-adsorbed fluoride ions. With increasing calcination temperature from 300 to 900℃, the building blocks of the TiO₂-HMSs evolve from truncated bipyramidal shaped hollow nanoparticles to round solid nanoparticles, and the photoreactivity of the TiO₂-HMSs steady increases from 0.82×10^-3 to 2.09×10^-3 min^-1 because of enhanced crystallization. Further increasing the calcination temperature to 1000 and 1100℃ results in a decrease of the photoreactivity, which is ascribed to a sharp decrease of the Brunau-er-Emmett-Teller surface area and the beginning of the anatase-rutile phase transformation at 1100℃. The effect of surface-adsorbed fluoride ions on the thermal stability of the TiO₂-HMSs is also discussed.
- TiO₂ hollow microsphere,
- Photocatalytic oxidation,
- Acetone,
- Fluorine,
- Thermal stability
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Highly photoreactive TiO2 hollow microspheres with super thermal stability for acetone oxidation

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Highly photoreactive TiO₂ hollow microspheres with super thermal stability for acetone oxidation