Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity

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: Guang Feng, Mengyun Hu, Shuai Yuan, Junyi Nan, Heping Zeng
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
Materias:
hydrogenated TiO<sub>2−x</sub>
oxygen vacancy
hydrogenation
liquid plasma
band structure
Chemistry
QD1-999
Acceso en línea:https://doaj.org/article/8f90b54ca6f6421a8f3ec90747dac186
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spelling oai:doaj.org-article:8f90b54ca6f6421a8f3ec90747dac1862021-11-25T18:29:55ZHydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity10.3390/nano111128012079-4991https://doaj.org/article/8f90b54ca6f6421a8f3ec90747dac1862021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2801https://doaj.org/toc/2079-4991Hydrogenated 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.Guang FengMengyun HuShuai YuanJunyi NanHeping ZengMDPI AGarticlehydrogenated TiO<sub>2−x</sub>oxygen vacancyhydrogenationliquid plasmaband structureChemistryQD1-999ENNanomaterials, Vol 11, Iss 2801, p 2801 (2021)
institution DOAJ
collection DOAJ
language EN
topic hydrogenated TiO<sub>2−x</sub>
oxygen vacancy
hydrogenation
liquid plasma
band structure
Chemistry
QD1-999
spellingShingle hydrogenated TiO<sub>2−x</sub>
oxygen vacancy
hydrogenation
liquid plasma
band structure
Chemistry
QD1-999
Guang Feng
Mengyun Hu
Shuai Yuan
Junyi Nan
Heping Zeng
Hydrogenated Amorphous TiO<sub>2−x</sub> and Its High Visible Light Photoactivity
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.
format article
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
title 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_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_sort hydrogenated amorphous tio<sub>2−x</sub> and its high visible light photoactivity
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/8f90b54ca6f6421a8f3ec90747dac186
work_keys_str_mv AT guangfeng hydrogenatedamorphoustiosub2xsubanditshighvisiblelightphotoactivity
AT mengyunhu hydrogenatedamorphoustiosub2xsubanditshighvisiblelightphotoactivity
AT shuaiyuan hydrogenatedamorphoustiosub2xsubanditshighvisiblelightphotoactivity
AT junyinan hydrogenatedamorphoustiosub2xsubanditshighvisiblelightphotoactivity
AT hepingzeng hydrogenatedamorphoustiosub2xsubanditshighvisiblelightphotoactivity
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