Effect of irradiation intensity and initial pollutant concentration on gas phase photocatalytic activity of TiO2 nanotube arrays

Paweł Mazierski , Joanna Nadolna , Wojciech Lisowski , Michał Jerzy Winiarski , Maria Gazda , Michał Nischk , Tomasz Klimczuk , Adriana Zaleska-Medynska

Abstract

Well-organized TiO2 nanotube arrays were fabricated via one-step anodization process. The as-prepared TiO2 nanotubes were characterized by X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS) and scanning electron microscopy (SEM). Photocatalytic activity of obtained photocatalyst was studied in reaction of toluene degradation in the gas phase using low powered and low cost light-emitting diodes (UV LEDs) as an irradiation source. The effect of irradiation intensity and initial pollutant concentration on gas phase photoactivity of TiO2 nanotubes was analyzed. Obtained TiO2 nanotubes were smooth and vertically oriented with a length of about 1.7 ± 0.05 μm. The inner diameter and the wall thickness were 65 ± 2 nm and 6 ± 0.4 nm, respectively. The results showed that the initial toluene degradation rate increased (from 0.0062 up to 0.0567 μmol/min) with raising initial toluene concentration (50–400 ppm), while too high dose of irradiation (about 50 mW/cm2) reduced photocatalytic toluene degradation rate. The best stability of TiO2 nanotubes in three subsequent irradiation cycles was observed for irradiation intensity of 38 mW/cm2. Moreover, it was found that photocatalytic toluene degradation over TiO2 nanotubes showed first order kinetic behavior.
Author Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Joanna Nadolna (FCh / DET / LPh)
Joanna Nadolna,,
- Laboratory of Photocatalysis
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Michał Jerzy Winiarski
Michał Jerzy Winiarski,,
-
, Maria Gazda
Maria Gazda,,
-
, Michał Nischk (FCh / DET / LPh)
Michał Nischk,,
- Laboratory of Photocatalysis
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesCatalysis Today, ISSN 0920-5861, (A 40 pkt)
Issue year2017
Vol284
Pages19-26
Publication size in sheets0.5
Keywords in EnglishTiO2 nanotubes, gas phase photocatalysis, irradiation intensity, light-emitting diodes, toluene photodegradation
DOIDOI:10.1016/j.cattod.2016.09.004
URL http://dx.doi.org/10.1016/j.cattod.2016.09.004
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.636 (2) - 2016=4.233 (5)
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