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Facet engineered TiO2 hollow sphere for the visible-light-mediated degradation of antibiotics via ligand-to-metal charge transfer.
- Source :
-
Ceramics International . May2020, Vol. 46 Issue 7, p8949-8957. 9p. - Publication Year :
- 2020
-
Abstract
- Efficient removal of tetracycline (TC) under visible-light irradiation over TiO 2 -based photocatalysts remains a challenge based on the fact that the reported photocatalytic systems still suffer from weak visible-light absorption and/or inefficient charge separation. Herein, we constructed {101} and {001} facets co-exposed TiO 2 hollow sphere (001-HT) via a gentle NaF treatment, in which the hollow mesoporous feature can trap incident light for a long time to improve photons efficiently. Meanwhile, the as-formed facet heterojunction significantly facilitates the charge separation. As a result, the 001-HT exhibits a high removal rate (~90.1%) of TC under visible-light irradiation, beyond the values of many reported TiO 2 -based photocatalysts. Most importantly, we further expound the ligand-to-metal charge transfer mechanism towards TiO 2 -assisted degradation of TC under visible-light irradiation, which effectively clarifies the confusion about the origin of pure TiO 2 visible-light activity towards TC degradation because both TiO 2 and TC do not exhibit any visible-light catalytic activity. Therefore, this work provides a new insight in revealing the mechanism of visible-light-mediated TC degradation over pure TiO 2 photocatalyst. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 46
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 142228787
- Full Text :
- https://doi.org/10.1016/j.ceramint.2019.12.142