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International Journal of Photoenergy
Volume 2012, Article ID 398230, 6 pages
Research Article

Photodegradation of Rhodamine B in Presence of CaO and NiO-CaO Catalysts

Chair for Construction Chemicals, Technische Universität München, Lichtenbergstraße 4, 85747 Garching bei München, Germany

Received 2 April 2012; Accepted 2 May 2012

Academic Editor: Leonardo Palmisano

Copyright © 2012 Tobias Kornprobst and Johann Plank. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A CaO catalyst was prepared by mild calcination (650°C) of facilely precipitated Ca(OH)2 and compared to an NiO-CaO catalyst obtained from an Ni(OH)2/Ca(OH)2 coprecipitate as a precursor. Both catalysts degraded rhodamine B (RB) effectively when exposed to ultraviolet light but exhibited slower degradation under visible light conditions. Under UV light, CaO was more effective than NiO-CaO, while in visible light, the opposite was observed. A mechanistic study revealed no influence of the specific surface area of the catalysts on RB degradation, no adsorption of RB on the positively charged surfaces of the catalysts, and only incomplete degradation of RB. Consequently, both materials represent nonconventional photocatalysts.