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Green

a systemic approach to energy

Editor-in-Chief: Schlögl, Robert

Managing Editor: Tiedtke, Marion

Editorial Board: Luther, Joachim / Meng, Qingbo / Hüttl, Reinhard F. / Koumoto, Kunihito / Gasteiger, Hubert


SCImago Journal Rank (SJR) 2018: 0.248
Source Normalized Impact per Paper (SNIP) 2018: 0.421

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Adsorption and Destruction of Methylene Blue by Semiconductor Photocatalysis

Andrew Mills
  • Corresponding author
  • Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G11XL, UK
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Christopher O'Rourke
Published Online: 2011-02-21 | DOI: https://doi.org/10.1515/green.2011.001

Abstract

The observed adsorption of methylene blue, MB+, on P25 titania over a range of pH values (pH 2–11) is reported and the results fitted to a charge distribution, multisite complexation, i.e. CD-MUSIC, model, modified for both monomer and aggregated dye adsorption and (for aggregates) co-adsorption of hydroxyl ions. The rate of bleaching of MB+, photocatalysed by titania using UV light, increases over the pH range 4–11 in much the same way the amount of adsorbed MB+, [MB+]ads, increases, indicating that the rate-determining step involves direct hole oxidation of adsorbed MB+. In contrast, at pH 2, the rate of UVA dye photobleaching appears unduly high but is due to an additional reductive, as well as the usual oxidative, bleaching processes. The initial rate of bleaching of MB+ via a visible light-driven, dye-sensitised process, measured at different pH's correlates with the associated CD-MUSIC-calculated values of [MB+]ads, indicating that only dye molecules that are in direct contact with the surface can undergo photodegradation via a dye-sensitised route.

Keywords.: Photocatalysis; CD-MUSIC; Adsorption; Photobleaching; Methylene Blue

About the article

Corresponding author: Andrew Mills, E-mail: .


Received: 2010-08-25

Accepted: 2010-12-20

Published Online: 2011-02-21

Published in Print: 2011-03-01


Citation Information: Green, Volume 1, Issue 1, Pages 105–113, ISSN (Online) 1869-8778, ISSN (Print) 1869-876X, DOI: https://doi.org/10.1515/green.2011.001.

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Journal of Photochemistry and Photobiology A: Chemistry, 2018
[2]
Jan Kegel, Vitaly Z. Zubialevich, Michael Schmidt, Ian M. Povey, and Martyn E. Pemble
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[3]
Soo-Keun Lee, Andrew Mills, and Christopher O'Rourke
Chem. Soc. Rev., 2017, Volume 46, Number 16, Page 4877
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Mariano Curti, Cecilia B. Mendive, María A. Grela, and Detlef W. Bahnemann
Materials Research Bulletin, 2017, Volume 91, Page 155
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Johan Gardères, Tarek A. Elkhooly, Thorben Link, Julia S. Markl, Werner E. G. Müller, Jochen Renkel, Michael Korzhev, and Matthias Wiens
Bioprocess and Biosystems Engineering, 2016, Volume 39, Number 9, Page 1477
[6]
Lourdes Hurtado, Reyna Natividad, Enelio Torres-García, Jorgelina Farias, and Gianluca Li Puma
Chemical Engineering Journal, 2015, Volume 262, Page 1284
[7]
Šárka Paušová, Josef Krýsa, Jaromír Jirkovský, Vanessa Prevot, and Gilles Mailhot
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Andrew Mills, Ashleigh Graham, and Christopher O’Rourke
Sensors and Actuators B: Chemical, 2014, Volume 190, Page 907
[10]
Matthias Böttger, Tobias Graumann, Redouan Boughaled, Frank Neumann, Wolfgang Kowalsky, and Hans-Hermann Johannes
Journal of Photochemistry and Photobiology A: Chemistry, 2013, Volume 253, Page 7
[11]
Andrew Mills, Claire Hill, and Peter K.J. Robertson
Journal of Photochemistry and Photobiology A: Chemistry, 2012, Volume 237, Page 7
[12]

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