Facile formation of self-organized TiO2 nanotubes in electrolyte containing ionic liquid-ethylammonium nitrate and their remarkable photocatalytic properties

Anna Pancielejko , Paweł Mazierski , Wojciech Lisowski , Adriana Zaleska-Medynska , Klaudia Kosek , Justyna Łuczak

Abstract

The oriented TiO2 nanotube arrays (NTs) are identified as a stable, active, and recyclable photocatalytic surface. However, their photoactivity is strictly dependent on morphology (especially length), which could be controlled by anodic oxidation parameters, including electrolyte properties. To control the morphology a series of NTs were successfully synthesized by a novel approach where ionic liquid (IL), ethylammonium nitrate [EAN][NO3], was used as an addition to an organic electrolyte. Using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, diffuse reflectance UV−vis spectroscopy, and photoluminescence spectroscopy, we are able to show how electrolyte composition influences nanotubes’ surface properties and photocatalytic activity. It was found that the change in the amount of [EAN][NO3] in the electrolyte used for anodization in the range from 0.05 to 1.0 wt % affected dynamic viscosity, conductivity, and surface tension of the electrolyte and finally altered the morphology of the formed nanotubes resulting in a proportional increase of the outer diameter and tube length from 105 to 140 nm and from 6.0 to 8.1μm, respectively. The highest photoactivity (achieving high reaction rate constant, equal to k= 0.0941 min−1) and wettability were found for the sample prepared in the electrolyte containing 0.05 wt % of [EAN][NO3], revealing the improved ability to light photoabsorption and suppression of recombination rate. The increase of the contact angle from 9.3° to 13.1° with elongation of the tube diameter from 107 to 140 nm was also noted. It turned out that the IL_NTs’ surface became more hydrophobic when stored in air ambience over 7 weeks after fabrication with approximately 20−52°.
Author Anna Pancielejko
Anna Pancielejko,,
-
, Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
, Klaudia Kosek
Klaudia Kosek,,
-
, Justyna Łuczak
Justyna Łuczak,,
-
Journal seriesACS Sustainable Chemistry & Engineering, ISSN 2168-0485, (A 40 pkt)
Issue year2018
Vol6
No11
Pages14510-14522
Publication size in sheets0.6
Keywords in EnglishTiO2 nanotubes, ionic liquid, electrochemical method, anodization, phenol degradation, photoactivity, photocatalysis
DOIDOI:10.1021/acssuschemeng.8b03154
URL https://pubs.acs.org/doi/10.1021/acssuschemeng.8b03154
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 08-11-2018, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 08-11-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 5.951 (2) - 2016=6.079 (5)
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