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This study presents the magnetically separable TiO2/FeOx microstructure decorated with poly-oxo-tungstate (POM) leading to the endocrine disruptor 2,4-dichlorophenol (2,4-DCP) under low intensity solar light. The fastest 2,4-DCP degradation kinetics was obtained by way of the TiO2/FeOx(25%)/POM(1%) composite in acidic media. The use of magnetized photocatalysts avoids the high cost separation of the catalysts from the solution by conventional treatments after 2,4-DCP-degradation. Reactive oxygen species (ROS) leading to the 2,4-DCP degradation were identified by use of appropriate scavengers. The 2,4-DCP degradation increased with the applied light intensity (fluence rate) providing evidence for the semiconductor behavior of the composite material. FeOx/Fe2O3 infra-gap states were identified by X-ray photoelectron spectroscopy (XPS) leading to 2,4-DCP degradation. A scheme for the interfacial charge transfer (IFCT) between the oxides is suggested based on the electronic energy position of the oxides making up the photocatalytic composite.
César Pulgarin, Juan Kiwi, Sami Rtimi, Stefanos Giannakis, Minoo Karbasi
Christophe Ballif, Jonas Geissbühler, Matthieu Despeisse, Mathieu Gérard Boccard, Jean Cattin