期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 252, 期 -, 页码 138-151出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.03.051
关键词
TiO2; Thulium; Lithium; Visible light; PDOS
资金
- Polish National Science Centre [NCN 2015/17/D/ST5/01331]
- Foundation for Polish Science (FNP)
- Interdisciplinary Center for Nanotoxicity at Jackson State University
- KDM CI TASK
- National Science Center [2015/19/N/NZ7/01593]
The utilization of solar light to induce a photocatalytic reaction in the presence of wide band gap semiconductors requires the modification of their surface and optical properties. The Vis-to-UV up-conversion process (UCP) that occurs in lanthanide ions could be employed to induce TiO2. Thus, having in mind solar-forced photocatalysis, nanostructured TiO2 co-modified with Tm and Li was prepared via a hydrothermal method. In addition to the exhaustive surface characterization of the as-prepared samples, the partial density of states (PDOS) was computed to better understand the electronic structure and physicochemical properties of the prepared photocatalysts. It was demonstrated that Tm ions were beneficial for phenol degradation in the aqueous phase under visible irradiation, whereas the co-presence of Tm and Li ions was profitable for enhanced luminescence. Although action spectra revealed that excitation of Tm-TiO2 in the range from 400 to 490 nm led to the photodegradation of phenol and 2-propanol, the UCP was not responsible for the photocatalytic activity under Vis irradiation. Therefore, it is proposed that the formation of sub-band gap states from the lanthanide 4f level played a key role in the phenol degradation process.
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