Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity
Hydrogenated crystalline TiO<sub>2</sub> with oxygen vacancy (O<sub>V</sub>) defect has been broadly investigated in recent years. Different from crystalline TiO<sub>2</sub>, hydrogenated amorphous TiO<sub>2−x</sub> for advanced photocatalytic applicat...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/8f90b54ca6f6421a8f3ec90747dac186 |
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| Sumario: | Hydrogenated crystalline TiO<sub>2</sub> with oxygen vacancy (O<sub>V</sub>) defect has been broadly investigated in recent years. Different from crystalline TiO<sub>2</sub>, hydrogenated amorphous TiO<sub>2−x</sub> for advanced photocatalytic applications is scarcely reported. In this work, we prepared hydrogenated amorphous TiO<sub>2−x</sub> (HA-TiO<sub>2−x</sub>) using a unique liquid plasma hydrogenation strategy, and demonstrated its highly visible-light photoactivity. Density functional theory combined with comprehensive analyses was to gain fundamental understanding of the correlation among the O<sub>V</sub> concentration, electronic band structure, photon capturing, reactive oxygen species (ROS) generation, and photocatalytic activity. One important finding was that the narrower the bandgap HA-TiO<sub>2−x</sub> possessed, the higher photocatalytic efficiency it exhibited. Given the narrow bandgap and extraordinary visible-light absorption, HA-TiO<sub>2−x</sub> showed excellent visible-light photodegradation in rhodamine B (98.7%), methylene blue (99.85%), and theophylline (99.87) within two hours, as well as long-term stability. The total organic carbon (TOC) removal rates of rhodamine B, methylene blue, and theophylline were measured to 55%, 61.8%, and 50.7%, respectively, which indicated that HA-TiO<sub>2−x</sub> exhibited high wastewater purification performance. This study provided a direct and effective hydrogenation method to produce reduced amorphous TiO<sub>2−x</sub> which has great potential in practical environmental remediation. |
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