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The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO2 nanosheets upon annealing of a freeze-cast precursor
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SYSNO ASEP 0507778 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO2 nanosheets upon annealing of a freeze-cast precursor Author(s) Bakardjieva, Snejana (UACH-T) SAI, RID, ORCID
Mareš, Jakub (UACH-T) SAI, RID
Fajgar, Radek (UCHP-M) RID, ORCID, SAI
Zenou, V. Y. (IL)
Malečková, M. (CZ)
Chatzisymeon, E. (GB)
Bíbová-Lipšová, Hana (UFCH-W)
Jirkovský, Jaromír (UFCH-W) RIDNumber of authors 8 Source Title RSC Advances. - : Royal Society of Chemistry
Roč. 9, č. 40 (2019), s. 22988-23003Number of pages 16 s. Language eng - English Country GB - United Kingdom Keywords lyophilized aqueous colloids ; lattice distortion ; salicylic-acid ; degradation ; titania ; 4-chlorophenol Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry Subject RIV - cooperation Institute of Chemical Process Fundamentals - Inorganic Chemistry
J. Heyrovsky Institute of Physical Chemistry - Physical ; Theoretical ChemistryR&D Projects GA18-15613S GA ČR - Czech Science Foundation (CSF) LM2015073 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UACH-T - RVO:61388980 ; UCHP-M - RVO:67985858 ; UFCH-W - RVO:61388955 UT WOS 000478628600025 EID SCOPUS 85073893087 DOI 10.1039/c9ra03940f Annotation Titanium dioxide modified with 3 wt% La was prepared via a green freeze-casting method, and its photocatalytic activity was tested in terms of its ability to degrade 4-chlorophenol (4-CP) and remove total organic carbon (TOC). Under annealing conditions, the freeze-cast precursor was transformed into an La-modified anatase with a well-defined 2D TiO2 nanosheet morphology. Rietveld refinement of the X-ray diffraction patterns confirmed the substitutional nature of the La cation that induced local structural variations and involved subtle ion displacement in the TiO2 lattice due to the ionic size effect. Despite nearly identical tetragonal structures, replacement of Ti with La alters the photocatalytic activity through a reduction in band gap energies and an increase in charge carrier mobility. Material annealed at 650 degrees C exhibited the highest photocatalytic performance and achieved efficient TOC removal. Upon annealing at 800 degrees C, nanoscale lanthanum-enriched regions were generated due to the diffusive migration of La cations and phase transition from anatase to rutile. The La3+ cation, acting as a structural promoter, supported 2D TiO2 growth with well controlled crystallite size, surface area and porosity. La3+ could be regarded as a potential electronic promoter that can reduce the band gap of 2D TiO2 nanosheets and can provide a signature of the electron transfer and carrier charge separation. Both methods, kinetics of degradation of 4-CP and TOC, provided similar results, revealing that the photocatalytic activity under UV light irradiation increased in the order 950C < 500 degrees C < 800 degrees C < 650 degrees C < TiO2-P25. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0298752
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