Influence of inorganic additives on the photocatalytic removal of nitric oxide and on the charge carrier dynamics of TiO2 powders

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Fabian Sieland
  • Ngoc Anh Thu Duong
  • Jenny Schneider
  • Detlef W. Bahnemann

Research Organisations

External Research Organisations

  • Saint Petersburg State University
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Details

Original languageEnglish
Pages (from-to)142-151
Number of pages10
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume366
Early online date3 Feb 2018
Publication statusPublished - 1 Nov 2018

Abstract

Building materials employing TiO 2 as photocatalyst usually contain several additives. The interplay of the additives and the photocatalytic NO degradation has been rarely investigated, although it is of utmost importance for the design of new highly active materials. Hence, in the present study the effects of such additives (BaSO 4, CaCO 3, and Na 2CO 3) on the photocatalytic activity and on the charge carrier dynamics have been evaluated. The degradation of nitric oxide (NO) was studied employing a standardized photocatalytic activity test (ISO 22197-1) and the charge carrier kinetics were observed by transient absorption spectroscopy. TiO 2-additive powder samples were obtained by grinding pure anatase TiO 2 with a single additive with varying volume composition. Overall, the obtained apparent quantum yields of the samples correlated well with the charge carrier concentration. Moreover, BaSO 4 has proven its chemically inert character. However, the optical properties of the powder samples containing BaSO 4 lead to relatively high photonic efficiencies even with low TiO 2 content. TiO 2-BaSO 4 samples with only 25% TiO 2 showed nearly the same quantum yield for the NO degradation as the pure photocatalyst. The reason for the high photocatalytic activity is the strong absorption of UV-light caused by the scattering inside the powder samples. The charge carrier kinetics of TiO 2 after the addition of Na 2CO 3 and CaCO 3 revealed two different chemical effects of the additives. Na 2CO 3 reduced the apparent quantum yield of the TiO 2 samples due to the fast recombination of charge carriers (identified by a fractal kinetics fit). On the other hand, the presence of CaCO 3 had a beneficial influence on the stabilization of trapped charge carriers in TiO 2.

Keywords

    Barium sulfate, Carbonate, Charge carrier dynamics, Kinetics, Nitric oxide degradation, Photocatalysis, Semiconductor, Transient absorption spectroscopy

ASJC Scopus subject areas

Cite this

Influence of inorganic additives on the photocatalytic removal of nitric oxide and on the charge carrier dynamics of TiO2 powders. / Sieland, Fabian; Duong, Ngoc Anh Thu; Schneider, Jenny et al.
In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 366, 01.11.2018, p. 142-151.

Research output: Contribution to journalArticleResearchpeer review

Sieland F, Duong NAT, Schneider J, Bahnemann DW. Influence of inorganic additives on the photocatalytic removal of nitric oxide and on the charge carrier dynamics of TiO2 powders. Journal of Photochemistry and Photobiology A: Chemistry. 2018 Nov 1;366:142-151. Epub 2018 Feb 3. doi: 10.1016/j.jphotochem.2018.01.036
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abstract = "Building materials employing TiO 2 as photocatalyst usually contain several additives. The interplay of the additives and the photocatalytic NO degradation has been rarely investigated, although it is of utmost importance for the design of new highly active materials. Hence, in the present study the effects of such additives (BaSO 4, CaCO 3, and Na 2CO 3) on the photocatalytic activity and on the charge carrier dynamics have been evaluated. The degradation of nitric oxide (NO) was studied employing a standardized photocatalytic activity test (ISO 22197-1) and the charge carrier kinetics were observed by transient absorption spectroscopy. TiO 2-additive powder samples were obtained by grinding pure anatase TiO 2 with a single additive with varying volume composition. Overall, the obtained apparent quantum yields of the samples correlated well with the charge carrier concentration. Moreover, BaSO 4 has proven its chemically inert character. However, the optical properties of the powder samples containing BaSO 4 lead to relatively high photonic efficiencies even with low TiO 2 content. TiO 2-BaSO 4 samples with only 25% TiO 2 showed nearly the same quantum yield for the NO degradation as the pure photocatalyst. The reason for the high photocatalytic activity is the strong absorption of UV-light caused by the scattering inside the powder samples. The charge carrier kinetics of TiO 2 after the addition of Na 2CO 3 and CaCO 3 revealed two different chemical effects of the additives. Na 2CO 3 reduced the apparent quantum yield of the TiO 2 samples due to the fast recombination of charge carriers (identified by a fractal kinetics fit). On the other hand, the presence of CaCO 3 had a beneficial influence on the stabilization of trapped charge carriers in TiO 2. ",
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T1 - Influence of inorganic additives on the photocatalytic removal of nitric oxide and on the charge carrier dynamics of TiO2 powders

AU - Sieland, Fabian

AU - Duong, Ngoc Anh Thu

AU - Schneider, Jenny

AU - Bahnemann, Detlef W.

N1 - © 2018 Elsevier B.V. All rights reserved.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Building materials employing TiO 2 as photocatalyst usually contain several additives. The interplay of the additives and the photocatalytic NO degradation has been rarely investigated, although it is of utmost importance for the design of new highly active materials. Hence, in the present study the effects of such additives (BaSO 4, CaCO 3, and Na 2CO 3) on the photocatalytic activity and on the charge carrier dynamics have been evaluated. The degradation of nitric oxide (NO) was studied employing a standardized photocatalytic activity test (ISO 22197-1) and the charge carrier kinetics were observed by transient absorption spectroscopy. TiO 2-additive powder samples were obtained by grinding pure anatase TiO 2 with a single additive with varying volume composition. Overall, the obtained apparent quantum yields of the samples correlated well with the charge carrier concentration. Moreover, BaSO 4 has proven its chemically inert character. However, the optical properties of the powder samples containing BaSO 4 lead to relatively high photonic efficiencies even with low TiO 2 content. TiO 2-BaSO 4 samples with only 25% TiO 2 showed nearly the same quantum yield for the NO degradation as the pure photocatalyst. The reason for the high photocatalytic activity is the strong absorption of UV-light caused by the scattering inside the powder samples. The charge carrier kinetics of TiO 2 after the addition of Na 2CO 3 and CaCO 3 revealed two different chemical effects of the additives. Na 2CO 3 reduced the apparent quantum yield of the TiO 2 samples due to the fast recombination of charge carriers (identified by a fractal kinetics fit). On the other hand, the presence of CaCO 3 had a beneficial influence on the stabilization of trapped charge carriers in TiO 2.

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KW - Barium sulfate

KW - Carbonate

KW - Charge carrier dynamics

KW - Kinetics

KW - Nitric oxide degradation

KW - Photocatalysis

KW - Semiconductor

KW - Transient absorption spectroscopy

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VL - 366

SP - 142

EP - 151

JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

SN - 1010-6030

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