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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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO2 nanosheets upon annealing of a freeze-cast precursor Tvůrce(i) 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) RIDCelkový počet autorů 8 Zdroj.dok. RSC Advances. - : Royal Society of Chemistry
Roč. 9, č. 40 (2019), s. 22988-23003Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova lyophilized aqueous colloids ; lattice distortion ; salicylic-acid ; degradation ; titania ; 4-chlorophenol Vědní obor RIV CA - Anorganická chemie Obor OECD Inorganic and nuclear chemistry Vědní obor RIV – spolupráce Ústav chemických procesů - Anorganická chemie
Ústav fyzikální chemie J.Heyrovského - Fyzikální chemie a teoretická chemieCEP GA18-15613S GA ČR - Grantová agentura ČR LM2015073 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora UACH-T - RVO:61388980 ; UCHP-M - RVO:67985858 ; UFCH-W - RVO:61388955 UT WOS 000478628600025 EID SCOPUS 85073893087 DOI 10.1039/c9ra03940f Anotace 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. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2020 Elektronická adresa http://hdl.handle.net/11104/0298752
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