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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MDPI AG
2021-10-01
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| Series: | Nanomaterials |
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| author | Guang Feng Mengyun Hu Shuai Yuan Junyi Nan Heping Zeng |
| author_facet | Guang Feng Mengyun Hu Shuai Yuan Junyi Nan Heping Zeng |
| author_sort | Guang Feng |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T05:13:42Z |
| format | Article |
| id | doaj.art-8f90b54ca6f6421a8f3ec90747dac186 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T05:13:42Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-8f90b54ca6f6421a8f3ec90747dac1862023-11-23T00:38:35ZengMDPI AGNanomaterials2079-49912021-10-011111280110.3390/nano11112801Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light PhotoactivityGuang Feng0Mengyun Hu1Shuai Yuan2Junyi Nan3Heping Zeng4Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaShanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaShanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaState Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, ChinaShanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaHydrogenated 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.https://www.mdpi.com/2079-4991/11/11/2801hydrogenated TiO<sub>2−x</sub>oxygen vacancyhydrogenationliquid plasmaband structure |
| spellingShingle | Guang Feng Mengyun Hu Shuai Yuan Junyi Nan Heping Zeng Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity Nanomaterials hydrogenated TiO<sub>2−x</sub> oxygen vacancy hydrogenation liquid plasma band structure |
| title | Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity |
| title_full | Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity |
| title_fullStr | Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity |
| title_full_unstemmed | Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity |
| title_short | Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity |
| title_sort | hydrogenated amorphous tio sub 2 x sub and its high visible light photoactivity |
| topic | hydrogenated TiO<sub>2−x</sub> oxygen vacancy hydrogenation liquid plasma band structure |
| url | https://www.mdpi.com/2079-4991/11/11/2801 |
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