1. Department of Environmental EngineeringDemocritus University of Thrace Xanthi 67100 Greece
2. Department of Chemical and Pharmaceutical Sciences ICCOM-CNR and INSTMUniversity of Trieste Trieste 34127 Italy
3. Institut de Chimie et Procédés Pour l'Energie l'Environnement et la Santé, (ICPEES) ECPMUniversity of Strasbourg Strasbourg 67087 France
4. INSTM and Department of Physics and AstronomyUniversity of Florence Sesto Fiorentino 50019 Italy
5. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica yQuímica Inorgánica Facultad de Ciencias Universidad de Cádiz Puerto Real 11510 Spain