Role of activated carbon on the increased photocatalytic activity of AC/Bi2WO6 coupled materials

Authors:  S. Murcia-López, J.A. Navío, M.C. Hidalgo

Abstract:
The photocatalytic activities of several Bi2WO6 and TiO₂/Bi₂WO₆ materials with different activated carbon (AC) contents were studied for Rhodamine B (RhB) (and Phenol) photodegradation under UV–vis and vis illumination. A wide characterization of the materials was carried out. The addition of AC strongly affected the Bi₂WO₆ morphology although not the crystalline phase. Even in the material with the lowest AC content (2 wt% nominal content) a structure with hierarchical porosity was formed. AC presence increased the initial reaction rates in the degradation of RhB. An important improvement in the photoactivity under both UV–vis and vis illumination conditions was obtained with the lowest AC content (2 wt%) when compared to the pristine material Bi₂WO₆ or to the systems with higher AC additions. AC/TiO₂/Bi₂WO₆ materials were also improved in comparison to the TiO₂/Bi₂WO₆ heterostructure without carbon. The improvement cannot be only ascribed to adsorption capability and surface area effects. A mechanism explaining the role of AC on the photocatalytic activity improvement is proposed.

Keywords:
Photocatalysis
Rhodamine B
Bismuth tungstate
Sunlike

Published in: Applied catalysis A: General  (Volume 466, Pages 1-314, 10 September 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Role of activated carbon on the increased photocatalytic activity of AC/Bi2WO6 coupled materials

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