Electrochemically obtained TiO2/CuxOy nanotube arrays presenting a photocatalytic response in processes of pollutants degradation and bacteria inactivation in aqueous phase

Magdalena Kozak , Paweł Mazierski , Joanna Żebrowska , Marek Kobylański , Tomasz Klimczuk , Wojciech Lisowski , Grzegorz Trykowski , Grzegorz Nowaczyk , Adriana Zaleska-Medynska

Abstract

TiO2/CuxOy nanotube (NT) arrays were synthesized using the anodization method in the presence of ethylene glycol and different parameters applied. The presence, morphology, and chemical character of the obtained structures was characterized using a variety of methods—SEM (scanning electron microscopy), XPS (X-ray photoelectron spectroscopy), XRD (X-ray crystallography), PL (photoluminescence), and EDX (energy-dispersive X-ray spectroscopy). A p-n mixed oxide heterojunction of Ti-Cu was created with a proved response to the visible light range and the stable form that were in contact with Ti. TiO2/CuxOy NTs presented the appearance of both Cu2O (mainly) and CuO components influencing the dimensions of the NTs (1.1–1.3 µm). Additionally, changes in voltage have been proven to affect the NTs’ length, which reached a value of 3.5 µm for Ti90Cu10_50V. Degradation of phenol in the aqueous phase was observed in 16% of Ti85Cu15_30V after 1 h of visible light irradiation (λ > 420 nm). Scavenger tests for phenol degradation process in presence of NT samples exposed the responsibility of superoxide radicals for degradation of organic compounds in Vis light region. Inactivation of bacteria strains Escherichia coli (E. coli), Bacillus subtilis (B. subtilis), and Clostridium sp. in presence of obtained TiO2/CuxOy NT photocatalysts, and Vis light has been studied showing a great improvement in inactivation efficiency with a response rate of 97% inactivation for E. coli and 98% for Clostridium sp. in 60 min. Evidently, TEM (transmission electron microscopy) images confirmed the bacteria cells’ damage.
Author Magdalena Kozak (FCh / DET / LPh)
Magdalena Kozak ,,
- Laboratory of Photocatalysis
, Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Joanna Żebrowska (FCh / DMBt / LGE)
Joanna Żebrowska,,
- Laboratory of Genetic Engineering
, Marek Kobylański (FCh / DET / LPh)
Marek Kobylański ,,
- Laboratory of Photocatalysis
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Grzegorz Trykowski
Grzegorz Trykowski,,
-
, Grzegorz Nowaczyk
Grzegorz Nowaczyk,,
-
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesCatalysts, ISSN , e-ISSN 2073-4344, (A 30 pkt)
Issue year2018
Vol8
No6
Pages1-20
Publication size in sheets0.95
Keywords in Englishheterogeneous photocatalysis, TiO2/Cu2O nanotubes, anodization, nanomaterials fabrication, removal of microbiological pollutants
DOIDOI:10.3390/catal8060237
URL https://doi.org/10.3390/catal8060237
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)30
ScoreMinisterial score = 30.0, 29-08-2018, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 29-08-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.082 (2) - 2016=3.947 (5)
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