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
- West Pomeranian University of Technology, Institute of Chemical Technology and Environment Engineering, ul. Pulaskiego 10, 70-322 Szczecin (Poland)
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.
- OSTI ID:
- 22215612
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 47; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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