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Title: The role of adsorption in decomposition of dyes on TiO{sub 2} and N-modified TiO{sub 2} photocatalysts under UV and visible light irradiations

Abstract

Graphical abstract: Influence of pH and zeta potential of TiO{sub 2} based photocatalysts on the adsorption and degradation of MB under UV irradiation. Highlights: ► Adsorption of dyes on TiO{sub 2}/N accelerated their decomposition under visible light. ► pH of solution and the PZC of the TiO{sub 2} surface influence the adsorption of dyes. ► Under UV irradiation oxidation of pollutants with OH radicals is the most powerful. -- Abstract: Photoactivities of TiO{sub 2} based photocatalysts towards dyes decomposition was studied by consider their adsorption abilities. It was proved that zeta potential and PZC (point zero charge) of photocatalyst surface as well as pH of solution strongly influenced adsorption of tested dyes, Methylene Blue (MB) and Reactive Red 198 (RR198). These dyes underwent the photocatalytic decomposition by two ways, OH radicals attack and direct oxidation with photogenerated holes. The latter one is more efficient in case of better contact of pollutant with the photocatalysts surface and is dominant under visible light irradiation, where insignificant amount of OH radicals is formed. The former one is powerful under UV irradiation and is a key factor in decomposition of dyes regardless of their adsorption abilities.

Authors:
 [1];  [1];  [1]
  1. West Pomeranian University of Technology, Institute of Chemical Technology and Environment Engineering, ul. Pulaskiego 10, 70-322 Szczecin (Poland)
Publication Date:
OSTI Identifier:
22215612
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ADSORPTION; DECOMPOSITION; ELECTRON MICROSCOPY; INFRARED SPECTRA; IRRADIATION; METHYLENE BLUE; OXIDATION; PHOTOCATALYSIS; SEMICONDUCTOR MATERIALS; SURFACES; TITANIUM OXIDES

Citation Formats

Bubacz, Kamila, Tryba, Beata, E-mail: beata.tryba@zut.edu.pl, and Morawski, Antoni W. The role of adsorption in decomposition of dyes on TiO{sub 2} and N-modified TiO{sub 2} photocatalysts under UV and visible light irradiations. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.06.038.
Bubacz, Kamila, Tryba, Beata, E-mail: beata.tryba@zut.edu.pl, & Morawski, Antoni W. The role of adsorption in decomposition of dyes on TiO{sub 2} and N-modified TiO{sub 2} photocatalysts under UV and visible light irradiations. United States. doi:10.1016/J.MATERRESBULL.2012.06.038.
Bubacz, Kamila, Tryba, Beata, E-mail: beata.tryba@zut.edu.pl, and Morawski, Antoni W. Thu . "The role of adsorption in decomposition of dyes on TiO{sub 2} and N-modified TiO{sub 2} photocatalysts under UV and visible light irradiations". United States. doi:10.1016/J.MATERRESBULL.2012.06.038.
@article{osti_22215612,
title = {The role of adsorption in decomposition of dyes on TiO{sub 2} and N-modified TiO{sub 2} photocatalysts under UV and visible light irradiations},
author = {Bubacz, Kamila and Tryba, Beata, E-mail: beata.tryba@zut.edu.pl and Morawski, Antoni W.},
abstractNote = {Graphical abstract: Influence of pH and zeta potential of TiO{sub 2} based photocatalysts on the adsorption and degradation of MB under UV irradiation. Highlights: ► Adsorption of dyes on TiO{sub 2}/N accelerated their decomposition under visible light. ► pH of solution and the PZC of the TiO{sub 2} surface influence the adsorption of dyes. ► Under UV irradiation oxidation of pollutants with OH radicals is the most powerful. -- Abstract: Photoactivities of TiO{sub 2} based photocatalysts towards dyes decomposition was studied by consider their adsorption abilities. It was proved that zeta potential and PZC (point zero charge) of photocatalyst surface as well as pH of solution strongly influenced adsorption of tested dyes, Methylene Blue (MB) and Reactive Red 198 (RR198). These dyes underwent the photocatalytic decomposition by two ways, OH radicals attack and direct oxidation with photogenerated holes. The latter one is more efficient in case of better contact of pollutant with the photocatalysts surface and is dominant under visible light irradiation, where insignificant amount of OH radicals is formed. The former one is powerful under UV irradiation and is a key factor in decomposition of dyes regardless of their adsorption abilities.},
doi = {10.1016/J.MATERRESBULL.2012.06.038},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}