1. Univ. Rennes, Ecole Nationale Superieure de Chimie de Rennes, CNRS, ISCR - UMR6226, F-35000 Rennes, France, 11 Allee de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France
2. "Vasile Alecsandri" University of Bacau, Faculty of Engineering, Department of Chemical and Food Engineering, 157 Calea Marasesti, 600115 Bacau, Romania