The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO2 nanosheets upon annealing of a freeze-cast precursor
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00507778" target="_blank" >RIV/61388955:_____/19:00507778 - isvavai.cz</a>
Alternative codes found
RIV/61388980:_____/19:00507778 RIV/67985858:_____/19:00507778 RIV/00216208:11310/19:10409289
Result on the web
<a href="http://hdl.handle.net/11104/0298752" target="_blank" >http://hdl.handle.net/11104/0298752</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/c9ra03940f" target="_blank" >10.1039/c9ra03940f</a>
Alternative languages
Result language
angličtina
Original language name
The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO2 nanosheets upon annealing of a freeze-cast precursor
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
RSC Advances
ISSN
2046-2069
e-ISSN
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Volume of the periodical
9
Issue of the periodical within the volume
40
Country of publishing house
GB - UNITED KINGDOM
Number of pages
16
Pages from-to
22988-23003
UT code for WoS article
000478628600025
EID of the result in the Scopus database
2-s2.0-85073893087