Title: On the photocatalytic degradation of phenol and dichloroacetate by BiVO4 : the need of a sacrificial electron acceptor
Authors : Castillo, Nikola C.
Ding, Laura
Heel, Andre
Graule, Thomas
Pulgarin, Cesar
Published in : Journal of photochemistry and photobiology : A, chemistry
Volume(Issue) : 216
Issue : 2-3
Pages : 221
Pages to: 227
Publisher / Ed. Institution : Elsevier
Issue Date: Dec-2010
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Bismuth vanadate; Visible light photocatalysis; Hydrogen peroxide; Electron scavenger
Subject (DDC) : 540: Chemistry
Abstract: The photodegradation of phenol and dichloroacetic acid (DCAA) by BiVO4 was studied in the absence as well as presence of selected electron scavengers. The experiments were performed under the visible (vis) irradiation of aqueous solutions over a wide pH range (1–13). Phenol was photocatalytically degraded by BiVO4 into p-benzoquinone below pH 3 and into an open-ring structure at pH 13. Methylene blue (MB) accelerated the reaction below the isoelectric point of BiVO4 and did not undergo significant degradation. In presence of H2O2, phenol was rapidly degraded up to pH 9. The degradation rates are two orders of magnitude higher than in absence of electron scavenger. The degradation of dichloroacetic acid was only possible in presence of H2O2. High initial concentrations of H2O2 inhibit the reaction and its consumption is very fast. Sequential additions of this sacrificial electron acceptor (SEA) enables the total degradation of a 1 mM DCAA solution.
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Publication type: Article in scientific Journal
DOI : 10.1016/j.jphotochem.2010.08.021
ISSN: 1010-6030
URI: https://digitalcollection.zhaw.ch/handle/11475/9275
Appears in Collections:Publikationen School of Engineering

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