1. Department of Chemistry, Yıldız Technical University, 34210 Istanbul, Turkey
2. Faculty of Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
3. Center for Nanointegration Duisburg-Essen (CENIDE) and Center for Water and Environmental Research (ZWU), University of Duisburg-Essen, 45141 Essen, Germany