Influences of annealing atmosphere on phase transition temperature, optical properties and photocatalytic activities of TiO2 phase-junction microspheres
| Autor: | Hui Li, Qian Zhang, Libing Duan, Ruidi Liu, Hao Shen, Xiaoru Zhao |
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| Rok vydání: | 2019 |
| Předmět: |
Phase transition
Anatase Materials science Annealing (metallurgy) Mechanical Engineering Metals and Alloys chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen 0104 chemical sciences chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry Chemical engineering Mechanics of Materials Rutile Materials Chemistry Photocatalysis Rhodamine B 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 789:1015-1021 |
| ISSN: | 0925-8388 |
| Popis: | TiO2 microspheres were successfully fabricated and subsequently annealed in air and N2 atmosphere under different temperatures. The morphologies, phase transition temperatures, optical properties were investigated by SEM, XRD, PL and XPS. The photocatalytic performances of these products were also evaluated toward Rhodamine B (RhB) degradation. The experimental data implied that the anatase phase could gradually transform to rutile phase with the temperature increasing from 450 °C to 600 °C under air atmosphere. However, the phase transition was inhabited to the range of 500–650 °C under N2 atmosphere. Analysis showed that the synergistic effect of the phase-junction could separate photo-generated electron-hole pairs to improve the photocatalytic activities. Moreover, N2 annealing could bring about the formation of charged oxygen vacancies and Ti3+, which further prolonged the life time of charge carriers and optimized the photocatalytic performance. |
| Databáze: | OpenAIRE |
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