The ILs-assisted solvothermal synthesis of TiO2 spheres : the effect of ionic liquids on morphology and photoactivity of TiO2

Marta Paszkiewicz , Justyna Łuczak , Wojciech Lisowski , Paulina Patyk , Adriana Zaleska-Medynska


Effect of the ionic liquid (IL) structure (chain length in the imidazolium cation) on morphology and photoactivity of TiO2 particles has been systematically investigated. The TiO2 microspheres have been successfully synthesized via facile solvothermal method assisted by ionic liquids, such as 1-butyl-3-methylimidazolium chloride [BMIM][Cl] and 1-decyl-3-methylimidazolium chloride [DMIM][Cl] using tetra-tert-butyl orthotitanate (TBOT) as a TiO2 precursor. Surface properties were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction analysis (XRD), BET surface area measurement, elemental analysis (NCHS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was investigated by means of phenol photodegradation in the aqueous phase as a model pollutant, as well as formation of hydroxyl radicals based on detection of fluorescent product of coumarine hydroxylation. Surface properties of TiO2 particles were correlated with the type and amount of the IL used during preparation as well as with the photoactivity. Both mechanism of the TiO2 spheres formation in the presence of [BMIM][Cl] and [DMIM][Cl] likewise the mechanism of their photoexcitation were also discussed. It was found that both electrostatic stabilization as well as coordination by imidazolium cation was responsible for securing the growth of the TiO2 spheres. The XPS data clearly revealed that the amount of carbon in the form of NCN species (imidazole-metal bound formed through C-2 carbon in imidazole ring) corresponds well with the change of the photoactivity. The most active samples (phenol degradation rate: 5.9 mmol·dm−3·min−1) contained the highest amount of carbon in the form of NCN species (6.06 at.%) among all ILs-TiO2 samples.
Author Marta Paszkiewicz PFotokatalizy
Marta Paszkiewicz,,
- Laboratory of Photocatalysis
, Justyna Łuczak
Justyna Łuczak,,
, Wojciech Lisowski
Wojciech Lisowski,,
, Paulina Patyk PFotokatalizy
Paulina Patyk,,
- Laboratory of Photocatalysis
, Adriana Zaleska-Medynska PFotokatalizy - [Politechnika Gdańska]
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
- Politechnika Gdańska
Journal seriesApplied Catalysis B: Environmental, ISSN 0926-3373
Issue year2016
Publication size in sheets0.7
Keywords in Englishionic liquids, ILs-assisted synthesis, TiO2 microspheres, TiO2 particles, heterogeneous photocatalysis, solvothermal synthesis
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 9.446 (2) - 2016=8.87 (5)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.