Journal
MATERIALS RESEARCH BULLETIN
Volume 47, Issue 11, Pages 3697-3703Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2012.06.038
Keywords
Semiconductors; Electron microscopy; Infrared spectroscopy; Catalytic properties
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Funding
- National Center of Science and Ministry of Higher Education and Science [MNiSW/DPN/4878/TD/2010]
- European Social Fund within the framework of Subaction Regional Innovation Strategies SOP HRD Investment in knowledge as a driving force for development of innovation in the region-II edition [8.2.2]
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Photoactivities of TiO2 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. (c) 2012 Elsevier Ltd. All rights reserved.
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