1. Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
2. Water Quality Group, Water4Environment Unit, Department of Life Sciences, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga, Portugal
3. Chemistry Department, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland