ANASTASIA E. HISKIA, is Research Director at the Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos," Athens, Greece.

THEODOROS M. TRIANTIS, is Senior Researcher at the Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos," Athens, Greece.

MARIA G. ANTONIOU, is Assistant Professor at the Department of Chemical Engineering, Cyprus University of Technology, Cyprus.

TRIANTAFYLLOS KALOUDIS, is head of the Organic Micropollutants Laboratory of the Athens Water Supply and Sewerage Company, EYDAP SA, Greece.

DIONYSIOS D. DIONYSIOU, is Professor of Environmental Engineering and Science in the Department of Chemical and Environmental Engineering at the University of Cincinnati, Ohio, USA.